Trane HUVC Installation, Operation And Maintenance Manual

Page 1

Installation, Operation, and Maintenance

Horizontal Unit Ventilator

Classroom Unit Ventilator—Model HUV

Models HUVC

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

January 2013 UV-SVN02C-EN

“C” and later Design Sequence 750 cfm—2000 cfm

SAFETY WARNING

Page 2

Warnings, Cautions, and Notices

Warnings, Cautions, and Notices. Note that

warnings, cautions, and notices appear at appropriate intervals throughout this manual. Warnings are provide to alert installing contractors to potential hazards that could result in personal injury or death. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

WARNI NG

ATT EN TI ON : Warnings, Cautions, and Notices appear at

appropriate sections throughout this literature. Read these carefully:

WARNING

CAUTIONs

NOTICE:

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

Indicates a situation that could result in equipment or property-damage only

Important Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians MUST put on all PPE required for the work being undertaken. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS sheets and OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.

• If there is a risk of arc or flash, technicians MUST put on all PPE in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR to servicing the unit.

Failure to follow instructions could result in death or serious injury.

WARNI NG

Contains Refrigerant!

System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives.

Failure to follow proper procedures or the use of nonapproved refrigerants, refrigerant substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

Page 3

WARNING

R-410A Refrigerant under Higher Pressure than R-22!

Some of the units described in this manual uses R-410A refrigerant which operates at higher pressures than R-22 refrigerant. Use ONLY R-410A rated service equipment or components with this unit. For specific handling concerns with R-410A, please contact your local Trane representative.

Failure to use R-410A rated service equipment or components could result in equipment or components exploding under R-410A high pressures which could result in death, serious injury, or equipment damage.

WARNING

Hazard of Explosion!

Use only dry nitrogen with a pressure regulator for pressurizing unit. Do not use acetylene, oxygen or compressed air or mixtures containing them for pressure testing. Do not use mixtures of a hydrogen containing refrigerant and air above atmospheric pressure for pressure testing as they may become flammable and could result in an explosion. Refrigerant, when used as a trace gas should only be mixed with dry nitrogen for pressurizing units. Failure to follow these recommendations could result in death or serious injury or equipment or property-only damage.

Warnings, Cautions, and Notices

Trademarks

ComfortLink, Rover, Tracer, Tracer Summit, Trane, and the Trane logo are trademarks or registered trademarks of Trane in the United States and other countries. All trademarks referenced in this document are the trademarks of their respective owners.

BACnet is a registered trademark of American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE); Echelon, LonTalk, and L trademarks of Echelon Corporation; Energizer is a registered trademark of Eveready Battery Company, Inc.; National Electrical Code, National Fire Protection Association, and NEC are registered trademarks of the National Fire Protection Association.

UV-SVN02C-EN 3

ONWORKS are registered

Page 4

Table of Contents

Model Number Descriptions . . . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . 8

Unit Description . . . . . . . . . . . . . . . . . . . . . 8

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Unit Ventilator Controls . . . . . . . . . . . . . . 10

ECM Application Notes . . . . . . . . . . . . . . . . . . 12

Dimensions and Weights . . . . . . . . . . . . . . . . 13

Unit Location and Clearances . . . . . . . . . 13

Receiving and Handling . . . . . . . . . . . . . . . . . 19

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . 20

Jobsite Inspection . . . . . . . . . . . . . . . . . . 20

Jobsite Storage . . . . . . . . . . . . . . . . . . . . 20

Installation—Mechanical . . . . . . . . . . . . . . . . 21

Location Considerations . . . . . . . . . . . . . . . 21

Unit Mounting . . . . . . . . . . . . . . . . . . . . . . . 21

Horizontal Recessed Mounting . . . . . . . . 21

Installation—Piping . . . . . . . . . . . . . . . . . . . . . 23

Trane Piping Packages (Option) . . . . . . . 23

Split System Units . . . . . . . . . . . . . . . . . . 23

Refrigerant Piping . . . . . . . . . . . . . . . . . . 23

Steam Piping . . . . . . . . . . . . . . . . . . . . . . 24

Modulating Water Valves (Option) . . . . . 24

Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Manual Opener . . . . . . . . . . . . . . . . . . . . . 26

Isolation Valves . . . . . . . . . . . . . . . . . . . . . . 26

Installation . . . . . . . . . . . . . . . . . . . . . . . . 26

Servicing/Removal of Valves . . . . . . . . . . 26

Heating Coils with Direct Expansion Cooling

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installation—Sensors . . . . . . . . . . . . . . . . . . . 28

Control Options . . . . . . . . . . . . . . . . . . . . . . 28

Installing Wall-Mounted Wired Sensors . 29

Location Considerations . . . . . . . . . . . . . 30

Location Considerations for Wireless Zone

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Fan Mode Switch Installation . . . . . . . . . 30

Zone Sensor Installation . . . . . . . . . . . . . 30

Wireless Sensors . . . . . . . . . . . . . . . . . . . . . 31

Address Setting . . . . . . . . . . . . . . . . . . . . 31

Observing the Receiver for Readiness to As-

sociate . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Associating the Sensor to the Receiver . .32

Testing Signal Strength and Battery Status

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Configuring the Wireless Display Sensor

(Model WDS only) . . . . . . . . . . . . . . . . . . .34

Sensor Operations . . . . . . . . . . . . . . . . . . .36

Wireless Sensor Specifications . . . . . . . . . 39

Installation—Electrical . . . . . . . . . . . . . . . . . . .41

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Electrical Wiring . . . . . . . . . . . . . . . . . . . . .41

Electric Heat Units . . . . . . . . . . . . . . . . . . . 41

Heating Coils with Direct Expansion Cooling

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

ECM Overview and Setup . . . . . . . . . . . . . . . . 43

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

General Information . . . . . . . . . . . . . . . . . . .43

Trane BLDC Motor . . . . . . . . . . . . . . . . . . .43

ECM Engine Controller . . . . . . . . . . . . . . .43

Standard Adapter Board . . . . . . . . . . . . . .44

CSTI Adapter Board . . . . . . . . . . . . . . . . . .44

Installation and Initial Setup . . . . . . . . . . . .45

Installation and Initial Setup . . . . . . . . . . .45

Adjustment and Configuration of the Engine

Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Status Display . . . . . . . . . . . . . . . . . . . . . . .48

Initial Setup and Configuration . . . . . . . . .53

Configuration . . . . . . . . . . . . . . . . . . . . . . . . .53

Configuring the ECM Engine Controller . .53

Configuring the ECM Engine Board . . . . .58

Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Setting the Time Clock . . . . . . . . . . . . . . . .63

Wired Controllers—Communication Wiring 65

Wiring Installation (Tracer ZN520) . . . . . . .65

Device Addressing . . . . . . . . . . . . . . . . . . .65

Recommended Communication Wiring Prac-

tices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Wiring Installation (Tracer UC400) . . . . . . .65

Wiring Overview Outline . . . . . . . . . . . . . .66

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General Instructions . . . . . . . . . . . . . . . . . 66

BACnet MS/TP Link . . . . . . . . . . . . . . . . . 66

Power Supply . . . . . . . . . . . . . . . . . . . . . . 67

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Pre-Start-up Checklist . . . . . . . . . . . . . . . 69

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Tracer ZN520 Unit Startup . . . . . . . . . . . . 70

Tracer UC400 Unit Startup . . . . . . . . . . . 70

General Information . . . . . . . . . . . . . . . . . 70

Fan Mode Switch Operation . . . . . . . . . . 70

Tracer ZN520 Operation . . . . . . . . . . . . . 70

UC400 Controller Operation . . . . . . . . . . 71

Tracer ZN520 Sequence of Operation . . . 71

Cooling Operation (Tracer ZN520) . . . . . 72

Fan Mode Operation (Tracer ZN520) . . . 73

UC400 Sequence of Operation . . . . . . . . . 78

Power-up Sequence (UC400) . . . . . . . . . 78

Random Start (UC400) . . . . . . . . . . . . . . . 78

Occupancy Modes (UC400) . . . . . . . . . . . 78

Timed Override Control (UC400) . . . . . . 79

Zone Temperature Control (UC400) . . . . 79

Discharge Air Tempering (UC400) . . . . . 80

Heating or Cooling Mode (UC400) . . . . . 80

Entering Water Temperature Sampling Func-

tion (UC400) . . . . . . . . . . . . . . . . . . . . . . . 80

Fan Operation (UC400) . . . . . . . . . . . . . . 80

Exhaust Control (UC400) . . . . . . . . . . . . . 81

Valve Operation (UC400) . . . . . . . . . . . . . 81

Modulating Outdoor/Return Air Damper

(UC400) . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Two-position Control Of A Modulating Out-

door Air Damper (UC400) . . . . . . . . . . . . 83

Electric Heat Operation (UC400) . . . . . . . 83

Dehumidification Operation (UC400) . . . 83

Peer-to-peer Communication (UC400) . . 83

Unit Protection Strategies (UC400) . . . . . 83

Removal of the Drain Pan . . . . . . . . . . . . .85

Removal of the Fanboard and Coil Cleaning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Lubrication: Fan Shaft . . . . . . . . . . . . . . . .86

Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Modulating Valves (3-Wire Floating) . . . .87

Preventive Maintenance . . . . . . . . . . . . . . . .87

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Troubleshooting Checklist . . . . . . . . . . . . .88

Output Testing and Diagnostics (Tracer ZN520)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Output Testing and Diagnostics (UC400) . .93

Output Testing (UC400) . . . . . . . . . . . . . . .93

Diagnostics (UC400) . . . . . . . . . . . . . . . . . 93

Troubleshooting (Wireless Controls) . . . . .94

Troubleshooting (Tracer ZN520) . . . . . . .100

Troubleshooting (UC400) . . . . . . . . . . . .101

Troubleshooting (ECM) . . . . . . . . . . . . . .103

General Information (ECM) . . . . . . . . . . .104

Troubleshooting Information (ECM) . . .104

Replacing ECM Components . . . . . . . . . . . .106

Circuit Modules Replacement Notes/Work In-

structions . . . . . . . . . . . . . . . . . . . . . . . . .107

Softsetting the IMC Address of an ECM En-

gine Module . . . . . . . . . . . . . . . . . . . . . . . 107

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Wallboxes . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

General Instructions . . . . . . . . . . . . . . . . .109

Installation in Masonry Walls . . . . . . . . .111

Installation in Curtain Walls . . . . . . . . . .111

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Service Access . . . . . . . . . . . . . . . . . . . . . 85

Periodic Maintenance . . . . . . . . . . . . . . . 85

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

UV-SVN02C-EN 5

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Model Number Descriptions

Digit 1, 2, 3 — Unit Configuration

HUV = Horizontal Unit Ventilator

Digit 4 — Development Sequence

C = Third Generation

Digit 5, 6, 7 — Development Sequence

075 = 750 CFM 100 = 1000 CFM 125 = 1250 CFM 150 = 150 0 CFM 200 = 2000 CFM

Digit 8 — Unit Incoming Power Supply

1 = 120V/60/1 2 = 208V/60/1 3 = 208V/60/3 4 = 240V/60/1 5 = 240V/60/3 6 = 277V/60/1 8 = 480V/60/3-Phase 4-Wire Power

Supply

Digit 9 — Motor

0 = Free Discharge ECM 4 = Free Discharge ECM, Low

Acoustics

7 = Free Discharge ECM, Low FLA

Option

N = Free Discharge, Low Acoustics,

Low FLA A = High Static ECM E = High Static ECM, Low Acoustics H = High Static ECM, Low FLA

Option K = High Static ECM, Low Acoustics,

Low FLA

Digit 10, 11 — Design Sequence

** = Design Sequence

Digit 12, 13 — Coil Letter Designation

(Single Coil Options)

AA = 2 R, 12 FPI CW/HW Changeover AB = 2 R, 16 FPI CW/HW Changeover AC = 3 R, 12 FPI CW/HW Changeover AD = 4 R, 12 FPI CW/HW Changeover AE = 4 R, 16 FPI CW/HW Changeover H1 = 1 R, 12 FPI Heating Coil H2 = 1 R, 14 FPI Heating Coil H3 = 1 R, 16 FPI Heating Coil H4 = 2 R, 12 FPI Heating Coil H5 = 2 R, 14 FPI Heating Coil H6 = 2 R, 16 FPI Heating Coil K1 = 1 R Low Capacity Steam Coil K2 = 1 R High Capacity Steam Coil E4 = 4 Element Heating Only Coil E6 = 6 Element Heating Only Coil E8 = 8 Element Heating Only Coil G0 = 2 R, 12 FPI DX Coil

(Coupled Coil Options)

DA = 1 R, 12 FPI HW Coil with 2 R,

12 FPI CW Coil

DC = 1 R, 12 FPI HW Coil with 2 R,

14 FPI CW Coil

DD = 1 R, 12 FPI HW Coil with 3 R,

12 FPI CW Coil

DE = 1 R, 14 FPI HW Coil with 3 R,

14 FPI CW Coil DK = 1 R Steam with 3 R CW Coil X3 = 3 Element Elec Coil with

3 R CW Coil (2 R on Sz 125) X4 = 4 Element Elec Coil with

3 R CW Coil (2 R on Sz 125) X6 = 6 Element Elec Coil with

3 R CW Coil (2 R on Sz 125) GK = 1 R Steam Coil with 2 R DX Coil GA = 1 R Heating coil with 2 R DX Coil G3 = 3 Element Elec Heat Coil with

2 R DX Coil G4 = 4 Element Elec Heat Coil with

2 R DX Coil G6 = 6 Element Elec Heat Coil with

2 R DX Coil R1 = 3 R, 12 FPI CW Coil with 1 R,

12 FPI HW Coil R2 = 3 R, 14 FPI CW Coil with 1 R,

12 FPI HW Coil

Digit 14 — Coil Connections

A = Right Hand Supply B = Left Hand Supply C = Left Hand Cool/Right Hand Heat D = Right Hand Cool/Left Hand Heat

Digit 15 — Control Types

0 = Unit-Mounted Speed Switch Q = Tracer™ ZN520 R = Tracer ZN520 w/Low Temp T = Tracer ZN520 w/Time Clock U = Tracer ZN520 w/Low Temp &

Time Clock X = Tracer ZN520 ICS w/Fan Status Y = Tracer ZN520 ICS w/Low Temp &

Fan Status 8=CSTI 9 = CSTI w/Low Temp L = Tracer UC400 M = Tracer UC400 w/Time Clock

Digit 16 — Heating/Change Over Coil Control

0=None 1 = Face & Bypass Damper Actuator 2 = 2-Pipe Face & Bypass Damper

Control 3 = 4-Pipe Face & Bypass Damper

Control & Isolation Valve 4 = Single Stage Electric Heat

Control 5 = Dual Stage Electric Heat 7 = Face & Bypass Damper w/2-Pipe

Control & Isolation Valve 9 = 2-Way 1/2-in. 3.3 CV; 3-Wire Mod W = 2-Way 1/2-in. 1.9 CV; 3-Wire Mod G = 2-Way 3/4-in. 4.7 CV; 3-Wire Mod H = 2-Way 1-in. 6.6 CV; 3-Wire Mod Z = 3-Way 1/2-in. 1.9 CV; 3-Wire Mod Q = 3-Way 1/2-in. 3.8 CV; 3-Wire Mod R = 3-Way 3/4-in. 6.6 CV; 3-Wire Mod T = Steam: 3-Wire Mod 1/2-in. 1.9 CV U = Steam: 3-Wire Mod 1/2-in. 4.7 CV V = Steam: 3-Wire Mod 3/4-in. 8.6 CV

Digit 17 — Cooling Coil Control

0=None 1 = Single Stage DX Controls A = Field-Supplied Analog Valves W = 2-Way 1/2-in. 1.9 CV; 3-Wire Mod G = 2-Way 3/4-in. 4.7 CV; 3-Wire Mod H = 2-Way 1-in. 6.6 CV; 3-Wire Mod Z = 3-Way 1/2-in. 1.5 CV; 3-Wire Mod Q = 3-Way 1/2-in. 3.8 CV; 3-Wire Mod R = 3-Way 3/4-in. 6.6 CV; 3-Wire Mod

Digit 18 — Damper Configuration

0 = Field Installed Damper Actuator 1 = 100% Return Air/No Damper or

Actuator

(Modulating ASHRAE Cycle II)

F = RA/OA Damper and Actuator

(2–10 Vdc) A = RA/OA Damper and Actuator

(3-Point Modulating) E = RA/OA Damper and Actuator

with Exhaust (3-Point Mod)

(Two Position Control)

D = Damper w/Manual Quad Adjust

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Page 7

Model Number Descriptions

Digit 19 — Zone Sensor/Fan Speed Switch

0 = No Sensor - Unit Mounted Fan

Speed Switch

J = Wall Mt Zone Sensor (OALMH;

Setpoint Dial; On/Cancel)

K = Wall Mt Zone Sensor (OALMH;

Setpoint Dial)

L = UNIT Mt Zone Sensor (OALMH;

Setpoint Dial)

M = Wall Mount Display Sensor

w/Setpoint Adjust

P = Wall Mt Sensor (Setpoint dial;

On/Cancel) w/Unit-Mt Speed Switch

Q = Wall Mt Sensor (Setpoint Dial)

w/Unit Speed Switch

3 = Wireless Display Sensor

(H-L-A-O)

4 = Wireless Sensor - Ext Adjust

Digit 20 — Inlet Arrangement

A = FA Duct Top/RA Duct Lower Back B = FA Duct Top/RA Duct Bottom C = FA Duct Top/RA Bar Grille

Bottom D = FA Duct Top/RA Open Bottom E = 100% FA Duct Top F = FA Duct Upper Back/RA Duct

Lower Back G = FA Duct Upper Back/RA Duct

Bottom H = FA Duct Upper Back/RA Bar

Grille Bottom J = FA Duct Upper Back/RA Open

Bottom (no grille) K = 100% FA Duct Upper Back L = 100% RA Duct Lower Back M = 100% RA Duct Bottom N = 100% RA Bar Grille Bottom P = 100% RA Open Bottom (no grille)

Digit 21 — Discharge Arrangement

1 = Bar Grille Discharge 2 = Duct Collar Discharge 7-1/8 in.

from Top 3 = Duct Collar Discharge 3/4 in.

from Top 4 = Duct Collar Discharge 3-5/8 in.

from Top 5 = Front Double Deflection Grille

Discharge 6 = Front Double Deflection Opening

Only (no grille) 7 = Bottom w/Double Deflection

Grille

Digit 22 — Unit Access Panel

0 = Std. Horizontal Access Panel 1 = Safety Chain/Std. Access Panel 2 = Removable Access Panel 3 = Safety Chain/Removable

Access Panel

Digit 23 — Recessing Flange

0 = No Recessing Flange 1 = Standard Recessing Flange

Digit 24 — Piping Package

0 = No Factory Installed Piping

A = Package 1; Standard Package C = Package 2; Standard Package

D = Package 3; Standard Package

Package

w/Circuit Setter

w/Strainer and Circuit Setter

Digit 25 — Filter

1 = Throwaway Filter 2 = MERV 8 Filter 3 = MERV 13 Filter

Digit 26 — Color Selection

1 = Deluxe Beige Cabinet 2 = Cameo White Cabinet 3 = Soft Dove Cabinet 4 = Stone Gray Cabinet 5 = Driftwood Gray Cabinet

Digit 27 — Motor Disconnect

0 = No Disconnect A = Non-Fused Toggle B = Circuit Breaker

Digit 28 — Control Accessories

0=None A= C0 B = Wall Mounted Relative Humidity

Sensor

UV-SVN02C-EN 7

Page 8

General Information

Unit Description

Configuration. This classroom unit ventilator is

configured in a horizontal (ceiling mount) configuration. The units range from 750 cfm to 2000 cfm for the horizontal configuration.

Cabinet. The units are constructed of 14- and 16-gauge

zinc coated steel. All steel surfaces are cleaned, phosphatized, rinsed and dried before application of final finish paint. The paint is applied by an electrostatic powder spray system, minimum thickness of 1.5 mil which results in an appliance grade finish.

Front Panels. The front panels are retained by Allen

wrench operated locks which open with a 180-degree rotation.

The bottom panel is constructed of heavy gauge material.

End Pockets. Unit Ventilators are equipped with end

pockets to provide field installation of valves, piping, and controls. The units have a large pipe access opening in both end pockets and large knockouts for piping and electrical connections. All electrical connections are made in the left-hand end pocket, with exception of units equipped with the electric heating coil option.

Drain Pan. The drain pan is positively sloped in all planes

to assure proper drainage and help eliminate the risk of microbial growth. To help ensure indoor air quality, the drain pan is insulated on the bottom to help prevent condensate formation. The drain pan can be easily removed for cleaning purposes. The drain pan is drilledout and pitched toward the cooling coil connection during assembly per model number selection.

are permanently lubricated. Motors are capable of starting at 50 percent of rated voltage and operating at 90 percent of rated voltage on all speed settings. Motors can operate up to 10 percent over voltage.

Filter. Standard units are equipped with a single 1-inch

thick filter (MERV 8) that is accessible without removal of the unit front panel. Filter options include throwaway, MERV 8 and MERV 13 options.

OA/RA Damper. Trane unit ventilators are equipped

with dual blade type mixing damper to ensure proper modulation and mixing of return and outdoor air designed in accordance to ARI 840. A splitter is placed between the damper blades to separate the fresh-air and return-air compartments to prevent draft blow-through.

Options

OA/RA Actuator (Option). The OA/RA actuator

provides true spring return operation for positive close-off of the OA/RA damper. The spring return system of the actuator closes the outside damper if power is lost to the building. When ordered with factory mounted controls, the actuator is 3-point floating. A 2 to 10 Vdc actuator is also available when other than Trane controls is required. See Ta b l e 1 , p . 8 for technical data of the OA/RA actuator.

Table 1. Technical data for OA/RA actuator

Fanboard. The fanboard assembly is acoustically

designed in a single, rigid assembly that includes the fans, fan housing, bearings, fan shaft and motor. The fan motor is mounted on the fanboard. The fanboard is made from 14-gauge galvanized steel to resist corrosion and increase strength.

Electrically Commutated Motor (ECM). All motors

are brushless DC (BLDC)/electronically commutated motors (ECM) factory-programmed and run-tested in assembled units. The motor controller is mounted in a control box with a built-in integrated user interface and LED tachometer. If adjustments are needed, motor parameters can be adjusted through momentary contact switches accessible without factory service personnel on the motor control board.

Motors will soft-ramp between speeds to lessen the acoustics due to sudden speed changes. Motors can be operated at three speeds or with a field-supplied variable speed controller. The motor will choose the highest speed if there are simultaneous/conflicting speed requests.

All motors have integral thermal overload protection with a maximum ambient operating temperature of 104°F and

8 UV-SVN02C-EN

Power Supply 24 Vac ±20% 50/60Hz

24 Vac ±10% Power Running: 2.5W Consumption Holding: 1W Transformer Sizing 5VA (class 2 power source) Overload Electronic throughout Protection 0- to 95-degree rotation Control Signal 2–10 Vdc 3 point floating w/ Trane controls Rotation Angle 95-degree max. Adjustable w/mechanical stop Torque 35-inch/lb Rotation Direction Spring return reversible w/CW/CCW mounting Position Indication Visual indicator, 0- to 95-degrees Noise Level Running: 30dB

Page 9

General Information

Face and Bypass (Option). The face and bypass option

consist of an actuator, damper blade and 2-position water valve (option).

During bypass mode, the damper moves to prevent air from traveling through the coil. The damper blade is tightly sealed to eliminate heat pickup while in the full bypass mode.

A two-position isolation valve control (option) further enhances this system by closing off all water flow to the coil during full bypass operation. Two-pipe main steam systems utilize the face and bypass as part of the standard operation and may incorporate the optional isolation valve.

Face and Bypass Actuator (Option). The face and

bypass damper actuator incorporates a direct couple design for the horizontal configurations. The actuator is provided with electronic protection against overload. It does not contain, nor require a limit switch. When reaching the damper end position, the actuator automatically stops. The gears can be manually disengaged with a button on the actuator housing. See Tab l e 2 for technical data.

Table 2. Technical data for face and bypass actuator

The actuator on the valve is a 24V, 3-point floating type. See Ta b l e 3 , p . 9 for more technical data.

Table 3. Technical data for modulating water valves

Power Supply 24V - 50/60 Hz Power Consumption 4W Maximum Duty Cycle 15% Operating Ambient Temperature 0°C to 65°C

32°F to 150°F

Min./Max. Fluid Temperatures 1°C to 95°C

34°F to 203°F Operating Pressure Differential Max. - 4 bar (60 psi) Pressure Rating Static - 20 bar (300 psi)

Burst - 100 bar (1500 psi) Flow Characteristics Linear

Power Supply 24 Vac ±20% 50/60Hz

24 Vac ±10% Power Consumption 2W Transformer Sizing 3VA (class 2 power source) Manual Override External push button Control Signal 3-point floating w/Trane controls Rotation Angle 95-degree max. Adjustable w/mechanical stop Torque 35-inch/lb Rotation Direction Reversible with switch L/R Position Indication Clip-on indicator Noise Level Less than 35dB

Modulating Water Valves (Option). The modulating

control valve option provides optimum control of hot and chilled water flow in various heating and cooling applications. They are designed to provide sinusoidal valve actuator travel and operate silently, resisting water hammer.

Isolation Valves (Option). The isolation valves are two

position 24V, spring return type. They provide added control in heating and cooling applications when used in conjunction with the face and bypass damper.

On heating coils and two-pipe change-over applications, the valve is a normally open type to prevent the coil from freezing in case of power loss.

For cooling, the valve is normally closed and opens when there is a call for cooling. See Table 4, p. 10 for more technical data.

UV-SVN02C-EN 9

Page 10

General Information

Table 4. Technical data for isolation water valves

Power Supply 24V - 50/60 Hz Power Consumption 5W Max. Fluid Temp. 200°F / 94°C Min. Fluid Temp. 34°F / 1°C Max. Operating Pressure 300 psi Max. Close-off Pressure 1/2 in.= 30 psi

3/4 = 20 psi 1 = 15 psi

Unit Ventilator Controls

Options

Field-Installed Controls (Option). The unit comes

equipped with a fan speed switch, damper blade (only), and an optional low temperature detection.

Customer Supplied Terminal Interface (CSTI) (Option).

will incorporate a pre-wired, selected control components to a terminal strip for wiring a field-provided controller and temperature sensor.

Note: For controller operation malfunction of any non-

Tracer ZN520 Control Package (Option). The Tracer

ZN520 electronic digital controller is a factory installed, tested and commissioned LonTalk may be used in a stand-alone control scheme, or as part of a building automation system. The controller is pre-wired to Trane selected control components best suited for room comfort. For more information on the Tracer ZN520 unit controller operation and service issues, refer to CNT-SVX04A-EN (Installation, Operation, and Programming Guide: Tracer ZN520 Unit Controller), or the most recent version.

Units containing the end device control design

Trane, field installed controls, consult the literature or technical support of the controls manufacturer.

certified design. It

Figure 1. Tracer ZN520 unit controller

Tracer UC400 Control Package (Option). The Tracer

UC400 electronic digital controller is a factory installed, tested and commissioned BACnet Tracer UC400 operates as a single zone VAV controller and ramps fan speed based on space load. It may be used in a stand-alone control scheme, or as part of a building automation system. The controller is mounted, pre-wired, and pre-programmed to selected control components best suited for room comfort. For more information on the Tracer UC400 unit controller operation and service issues, refer to BAS-SVX48B-EN (Installation, Operation, and

10 UV-SVN02C-EN

certified design. The

Page 11

Programming: Tracer UC400 Programmable Controller), or the most recent version.

Figure 2. Tracer UC400 unit controller

When Trane controls are ordered for an installation, the controls are shipped already installed and factory-tested to ensure proper operation at start-up.

Notes:

• For more details on the ZN520 unit controller option or

operation and service/replacement issues, please refer to CNT-SVX04A-EN (Installation, Operation, and Programming Guide: Tracer ZN520 Unit Controller), or the most recent version.

• For more details on the UC400 unit controller option or

operation and service/replacement issues, refer to BAS-SVX48B-EN (Installation, Operation, and Programming: Tracer UC400 Programmable Controller), or the most recent revision.

General Information

Automatic Controls

Regardless of type of controls, all systems provide a sequence of operation designed to provide rapid warm-up of the room and increase ventilation while offsetting overheating.

In addition, air conditioning installations will usually provide a means of system changeover from heating to cooling as well as provisions for drawing a pr e-determined amount of outside air into the room.

Unit Switch

The unit “On-Off” switch, provided by Trane, is typically housed in the control box mounted in the left hand end pocket immediately below the discharge grille.

When Tracer ZN520 or Tracer UC400 unit controllers are used, the unit switch is located on the switch module in the end pocket behind the front panel rather than below the grille.

UV-SVN02C-EN 11

Page 12

ECM Application Notes

The new Trane BLDC system has some notable differences to traditional designs.

RPM Mode

The motors are programmed from the factory to run in rpm mode and will not change rpm based on external static pressure, except at the performance limits of the motor/controller. For ducted units, the units are shipped with the rpm set for 0.2 in. ESP for High, Medium, and Low speeds. The speeds can for high, medium, and low operation, but should not be changed for the electric heat actuation speeds.

Generally, the fans deliver less cfm for the same rpm, if the static is increased and the power will decrease. The fan will deliver more cfm for the same rpm, if the static is decreased and the fan power will increase. A unit with high static configuration should not be used to free-deliver air (i.e., with no ducting attached).

Field Power Wiring

Note: This product uses an electronic variable speed

motor control, which includes a line reactor to minimize power line harmonic currents. It is recommended that good wiring practices be followed to manage building electrical power system harmonic voltages and currents to avoid electrical system problems or other equipment interaction.

Performance Boundaries

While the speeds of the fan motors can be adjusted, never program a fan speed higher than 1700 rpm, or lower than 450 rpm. In many cases, units configured for high-static operation will not achieve the desired rpm if the ESP of the unit is too low, or the unit is allowed to “free-discharge.” The ECM engine contains settings that will limit the output power of the motor under these overload conditions. If the motors cannot achieve rpm close to the target for a specific period of time, the unit will disable electric heat and fanstatus indicators.

perform the function of a two 3-pole contactors.

Figure 3. Sample arrangement: electric heat relay

Troubleshooting Other Unit Functions

In some cases, the normal or abnormal operation of the BLDC system may interact with other components in the system. Generally, verification of the engine and adapter boards’ wiring and configuration should be checked if there are unexplained abnormalities in other areas of the unit:

1. Valve operation

2. Electric Heat operation

3. Changeover sensor operation

4. Damper operation

5. Condensate overflow switch

A high degree of protection is provided on electric heat

nits. If electric heat fails to actuate, it may be because of

u one of the following events:

1. Fans are failing to meet target speed. If a second motor is not present, all settings for speeds for Motor 2 should be set to 0000.

2. Hot water may be available in the changeover coil.

3. The connection to analogue input 1 on the Tracer ZN controlle

4. Target speeds for motor a. The  parameter may be set incorrectly.

b. The

r may be reversed in polarity.

s may be set too high:

 parameter may be set incorrectly.

MCA/MFS and Power Draw

The Trane BLDC motors have variable output but are shipped at specific settings to deliver proper performance and reliability. The power draw indicated in the catalogue indicates the power consumed when applied properly (as shipped and with the nominal ESP applied). However, the nameplate of the unit indicates the maximum input draw of the motor, as the motor settings can be changed to draw more power.

Electric Heat Relays

For quiet operation, the new BLDC units employ power relays instead of definite purpose contactors for electric heat actuation. The coils of multiple relays are hooked in parallel to simulate a multi-pole contactor, as shown in

Figure 3. In Figure 3, two sets of three relays are used to

12 UV-SVN02C-EN

Page 13

Dimensions and Weights

Unit Location and Clearances

Locate the unit in an indoor area. The ambient temperature surrounding the unit must not be less than 45°F. Do not locate the unit in areas subject to freezing.

Electrocution and Fire Hazards with Improperly Installed and Grounded Field Wiring!

NOTICE:

Equipment Damage!

Do not locate the unit in areas subject to freezing. Pipes could burst at lower temperature resulting in equipment damage.

Attention should be given to service clearance and technician safety. The unit should contain enough space for service personnel to perform maintenance or repair. Provide sufficient room to make water, and electrical connection(s).

Table 5. Weights and measurements: horizontal unit ventilators

Unit Size 075 100 125 150 200

Unit Length (in.) 70-1/4 82-1/4 94-1/4 106-1/4 106-1/4 Unit Height (in.) 16-5/8 16-5/8 16-5/8 16-5/8 17-5/8 Unit Width (Front Discharge) (in.) 35-5/8 35-5/8 35-5/8 35-5/8 43-1/8 Unit Width (Bottom Discharge) (in.) 48-3/4 48-3/4 48-3/4 48-3/4 57-1/4 Shipping Weight (lb) Filter Size (inches-actual) 41-1/2 x 15-1/4 x 1 53-1/2 x 15-1/4 x 1 65-1/2 x 15-1/4 x 1 77-1/2 x 15-1/4 x 1 77-1/2 x 15-1/4 x 1

(a) Working weight is approximately 10% less than shipping weight. Trane recommends 1/4-inch rods for hanging suspension

(a)

340* 375* 435* 500* 600*

Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. All field wiring MUST be performed by qualified personnel.

Failure to follow these requirements could result in death or serious injury.

A 36-inch clearance at the unit front is sufficient for maintenance and service of the equipment.

WARNING

Table 6. Control methodology

Fan Speed

FSS 3 or infinite CSTI 3 or infinite Tracer ZN520 3 Tracer UC400 Infinite

(a)With a field-supplied 2–10 Vdc controller.

(a) (a)

Table 7. Control sequences

Fan Speeds

(b)

(a)

(b)

(a)

1 1 2 2

DX operation Electric heat operation Sidewall Exhaust ERSA

(a) Fan speed during sequence operation. (b)Unit Ventilator when operating with option.

UV-SVN02C-EN 13

Page 14

Dimensions and Weights

1 3/4"

10 1/8"

6 1/2"

10 1/2"

32 1/2"

35 5/8"

11"

14 1/2"

16 5/8"

7 1/8"

7 7/8"

B17 1/8"

12 1/8"

13 1/2" 13 1/2"

4 7/8"

2 3/8"

2"-DIA K.O. FOR PIPING

7/8"-DIA K.O.

FOR ELECTRICAL

17 1/8"

F.A. UPPER BACK

R.A. LOWER BACK

BACK VIEW SIDE VIEW

TOP VIEW

NOTE:

WHEN ELECTRIC HEAT IS PRESENT, ALL POWER CONNECTIONS ARE MADE IN THE RIGHT HAND END POCKET. ON ALL OTHER CONFIGURATIONS, POWER CONNECTIONS ARE MADE IN THE LEFT HAND END POCKET.

ISO VIEW

7/8" x 2" SLOTS FOR HANGING BRACKETS

RIGHT HAND END POCKET

LEFT HAND END POCKET

DISCHARGE

Figure 4. Horizontal unit ventilator with ducted front discharge dimensional data; sizes 075–150 (dimensions in

inches)

Size A B C D

75 70-1/4 36 46 43-1/4 100 82-1/4 48 58 55-1/4 125 94-1/4 60 70 67-1/4 150 106-1/4 72 82 79-1/4

14 UV-SVN02C-EN

Page 15

Dimensions and Weights

2 3/4"

10 1/8"

7 1/2"

11 1/2"

39 1/2"

26 1/2"

43 1/8"

13 1/2"

15 1/2"

17 5/8"

6 1/8"

9 7/8"

72"17 1/8"

12 1/8"

13 1/2" 13 1/2"

4 7/8"

2 3/8"

2"-DIA K.O. FOR PIPING

7/8"-DIA K.O.

FOR ELECTRICAL

17 1/8"

106 1/4"

82"

79 1/4"

F.A. UPPER BACK

R.A. LOWER BACK

BACK VIEW SIDE VIEW

TOP VIEW

ISO VIEW

7/8" x 2" SLOTS FOR HANGING BRACKETS

RIGHT HAND END POCKET

LEFT HAND END POCKET

DISCHARGE

NOTE:

WHEN ELECTRIC HEAT IS PRESENT, ALL POWER CONNECTIONS ARE MADE IN THE RIGHT HAND END POCKET. ON ALL OTHER CONFIGURATIONS, POWER CONNECTIONS ARE MADE IN THE LEFT HAND END POCKET.

72"

Figure 5. Horizontal unit ventilator with ducted front discharge dimensional data; size 200 (dimensions in inches)

UV-SVN02C-EN 15

Page 16

Dimensions and Weights

6 1/2"

10 1/2"

14 1/2"

R.A. LOWER BACK

17 1/8"

4 7/8"

2 3/8"

2"-DIA K.O. FOR PIPING

7/8"-DIA K.O.

FOR ELECTRICAL

17 1/8"

3/4"

7 1/4"

5 1/8"

16 5/8"

10 1/8"

32 3/4"

46"

48 3/4"

11"

12 1/8"

13 1/2" 13 1/2"

BACK VIEW SIDE VIEW

TOP VIEW

NOTE:

WHEN ELECTRIC HEAT IS PRESENT, ALL POWER CONNECTIONS ARE MADE IN THE RIGHT HAND END POCKET. ON ALL OTHER CONFIGURATIONS, POWER CONNECTIONS ARE MADE IN THE LEFT HAND END POCKET.

ISO VIEW

7/8" x 2" SLOTS FOR HANGING BRACKETS

RIGHT HAND END POCKET

LEFT HAND END POCKET

BOTTOM DISCHARGE

Figure 6. Horizontal unit ventilator with double deflection discharge dimensional data; sizes 075–150 (dimensions in

inches)

Size A B C D

75 70-1/4 36 46 43-1/4 100 82-1/4 48 58 55-1/4 125 94-1/4 60 70 67-1/4 150 106-1/4 72 82 79-1/4

16 UV-SVN02C-EN

Page 17

Dimensions and Weights

7 1/2"

11 1/2"

15 1/2"

72"

R.A. LOWER BACK

17 1/8"

4 7/8"

2 3/8"

2"-DIA K.O. FOR PIPING

7/8"-DIA K.O.

FOR ELECTRICAL

17 1/8"

3/4"

9 1/4"

5 1/8"

106 1/4"

17 5/8"

10 1/8"

26 1/2"

53 3/4"

57 1/4"

13 1/2"

12 1/8"

13 1/2" 13 1/2"

82"

79 1/4"

BACK VIEW SIDE VIEW

TOP VIEW

ISO VIEW

7/8" x 2" SLOTS FOR HANGING BRACKETS

RIGHT HAND END POCKET

LEFT HAND END POCKET

NOTE:

WHEN ELECTRIC HEAT IS PRESENT, ALL POWER CONNECTIONS ARE MADE IN THE RIGHT HAND END POCKET. ON ALL OTHER CONFIGURATIONS, POWER CONNECTIONS ARE MADE IN THE LEFT HAND END POCKET.

BOTTOM DISCHARGE

Figure 7. Horizontal unit ventilator with double deflection discharge dimensional data; size 200 (dimensions in

inches)

UV-SVN02C-EN 17

Page 18

Dimensions and Weights

Figure 8. Supply/return air arrangements for the horizontal unit ventilator

DIGIT 20 = A

FA DUCT TOP w/RA DUCT LOWER BACK

DIGIT 20 = B

FA DUCT TOP w/RA DUCT BOTTOM

DIGIT 20 = C & D

(D) FA DUCT TOP w/RA OPEN BOTTOM

DIGIT 20 = E

DIGIT 20 = F

FA DUCT UPPER BACK w/RA DUCT LOWER BACK

DIGIT 20 = G

FA DUCT UPPER BACK w/RA DUCT BOTTOM

DIGIT 20 = H & J

(H) FA DUCT UPPER BACK w/RA BAR GRILLE BOTTOM

(J) FA DUCT UPPER BACK w/RA OPEN BOTTOM (no grille)

DIGIT 20 = K

DIGIT 20 = L

100% RA DUCT LOWER BACK

DIGIT 20 = M

100% RA DUCT BOTTOM

DIGIT 20 = N & P

(N) 100% RA BAR GRILL BOTTOM

(P) 100% RA OPEN BOTTOM (no grille)

100% FA DUCT TOP

18 UV-SVN02C-EN

100% FA DUCT UPPER BACK

Page 19

Receiving and Handling

The unit ventilator is packaged in clear stretch wrap and protective cardboard.

Note: Before unwrapping, make a visual inspection of the

unit for any damage that may have occurred during shipping. All orders are shipped FOB (Freight on Board) from the factory, therefore any claims must be made with the delivering carrier.

Figure 9. Horizontal unit ventilator as shipped

Following visual inspection, carefully begin the following procedures:

1. Carefully remove the stretch wrap and the top cardboard cover.

2. Remove remaining cardboard blocking.

3. Remove the bottom access panel with a 7/32-in. Allen

wrenc

4. Verify nameplate sales order number is correct.

5. Remove shipping bracket from the lower rear corners of the unit and shipping skid. Access to the screws holding unit to the skid is obtained inside the unit.

Figure 10. Shipping skid removal

6. Rotate fan wheels manually. Wheels should move freely and be in proper alignment. Visually inspect the fan area for obstructions or shipping damage.

7. Remove all applicable knock-outs for coil piping and electrical connections

Figure 7, p . 17).

UV-SVN02C-EN 19

(see Figure 5, p. 13 through

Page 20

Pre-Installation

Jobsite Inspection

Always perform the following checks before accepting a unit:

1. Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data).

2. Verify that the power supply complies with the unit nameplate specifications.

3. Visually inspect the exterior shipping damage. Do not sign the bill of lading

accepting the unit(s) until inspection has been completed. Check for damage promptly after the unit(s) are unloaded. Once the bill of lading is signed at the jobsite, the unit(s) are now the property of the SOLD TO party and future freight claims MAY NOT be accepted by the freight company.

Jobsite Storage

This unit is intended for indoor use only. To protect the unit from damage due to the elements, and to prevent possible IAQ contaminant sources from growing.

1. Place the unit(s) on a dry surface or raise above the ground to assure adequate air circulation beneath the unit.

2. Cover the unit(s) with a water proof tarp to protect

from the elements.

them

of the unit, for signs of

NOTICE:

Microbial Growth!

Wet interior unit insulation can become an amplification site for microbial growth (mold), which may cause odors and damage to the equipment and building materials. If there is evidence of microbial growth on the interior insulation, the insulation should be removed and replaced prior to operating the system.

3. Make provisions for continuous venting of the covered units to prevent moisture from standing on the unit(s) surfaces.

4. Do not stack units.

20 UV-SVN02C-EN

Page 21

Installation—Mechanical

Location Considerations

Selecting the appropriate location for installing a unit is very important. The following factors should be considered:

1. Ceiling hung design must be of sufficient structure to support the weight of the unit (see Ta bl e 8 for weight data). Figure 5, p. 13 through Figure 9, p. 17 show hanging rod location and placement.

Note: Isolator and suspension rods are to be provided

by the installer. For hanging suspension, Trane recommends 3/8-in. rods.

Ta b l e 8. Typical unit weights

Unit Size lb kg

075 340 154 100 375 170 120 435 197 150 500 227 200 600 272

(a) Weight at time of shipping. Subtract approximately 10% for actual

hanging weight.

2. Service access is gained through the access panels on the bottom of the unit. Sufficient space should be allowed for panel removal. If the hinged panel option is ordered, allow for a swing radius of 14-in.

3. Sufficient free area around both the discharge and wall

ox should be maintained to ensure proper

b ventilation. If any part of the discharge is blocked off, unit performance may be affected. If the wall box is too small on the inlet, water or debris could be pulled into the unit (see Ta bl e 9) for minimum wall box free area requirements).

Table 9. Wall box free area requirements

Unit Size Discharge (in2)Inlet (in

075 232 169 100 296 217 120 364 265 150 430 313 200 576 391

4. Use the shortest and most efficient ductwork possible when ducting the discharge and/or return air grille. Units ordered with a duct collar discharge arrangement are equipped with a 1-in. duct flange.

Note: Ductwork

for ducted units will be provided by

the installer.

5. If installing a split system, refe installation instructions provided with that unit for special location considerations.

(a)

r to the condenser

)

Note: M

easurements in Figure 5, p. 13 through

Figure 9, p. 17 do not include adjusted leveling

legs. Adjustment of Leveling legs should be done first. New measurements from the floor should be retaken before installation.

Unit Mounting

The horizontal unit ventilator may be attached directly to the ceiling or suspended from the ceiling by hangers. Hanger rods should be at least 3/8 in. diameter steel to support unit weight, as given in Table 8, p. 21.

WARNI NG

Heavy Objects!

Always lift unit with fork trucks or other special lifting device following the recommended procedures. Failure to properly lift the unit as instructed, could result in death or serious injury.

Install the hanging devices before hoisting the unit. A fork lift or other special lifting device is required to hoist the unit into mounting position.

Protect the unit finish by covering the lifting platform.

To hoist the unit into place, follow the instructions below:

1. Secure 2 x 4s to the lift forks. These two supports must be long enough and spaced properly on the forks to support the unit while it is being lifted and clear the duct flanges on the unit.

2. Tip the unit onto the supports and slide it toward the lift

til the unit weight balances.

3. Lift the unit. Once in position, temporarily secure the

nit to the hanger rods or mounting studs with nuts

u and washers.

4. Align the unit with the du alignment, tighten the mounting nuts securely.

5. Recheck the unit alignment and make sure the unit is

level

6. Replace all covers, panels and filters the unit.

Note: Un

it must be mounted level. Coils and drain pans inside unit are pitched properly for drainage before shipment.

Horizontal Recessed Mounting

The recessing flange assembly ships in a box separate from the unit. The assembly includes pre-cut flanges, corner transition pieces, mounting screws, filler pieces, and pressure sensitive gaskets. Refer to Figure 11 and

Figure 12, p. 22 for typical horizontal installation.

ct work. When in proper

before starting

UV-SVN02C-EN 21

Page 22

Installation—Mechanical

Supply Air

Access Panel

Recessing Flange

Return Air Inlet Grille

Supply Air Grille

Access Panel

Recessing Flange

Return Air Inlet Grille

Intake Panel

Bottom Front Panel

Discharge Panel

End Cover

Figure 11. Recess flange installation around horizontal

unit ventilator access panel and inlet

rille

Figure 12. Recess flange installation around bottom

and front of horizontal unit

1. Measure and cut the pressure sensitive gaskets to the correct lengths and attach to the flanges.

2. Starting at a corner, attach the top flange with the mounting screws provided.

3. Press the corner transition pieces

onto the end of the flange and attach the adjoining flanges and filler pieces at the bottom of the unit. Work around the unit in this manner until all flanges and corners are installed.

4. Mounting holes are pre-drilled in assembled flanges as a template to drill all 7/32-in. mounting holes in the cabinet.

5. Attach the flange section to

the flanges. Use the

the unit cabinet with the

mounting screws provided.

6. Open and remove the front access panel.

7. Tighten the mounting fastener unit is level.

8. Open the unit access panel and remove the bottom front panel

(see Figure 13, p. 22).

, making sure that the

Figure 13. Horizontal unit ventilator with front panel

removed

9. Hoist the unit onto a forklift and mount in place as described in “Unit Mounting,” p. 21, ensuring the unit is secured and aligned in place, and that the mounting

are tightly fastened.

nuts

Note: Un

it must be mounted level. Coils and drain pans inside the unit are pitched internally for proper drainage.

10. Replace all covers, panels and filters before starting the it.

22 UV-SVN02C-EN

Page 23

Installation—Piping

13-5/8"

Horizontal Unit

Note: Before installation of piping package, the shipping

bracket holding the piping in place, must be removed.

Proper installation of piping is necessary to provide efficient coil operation and to prevent damage during operation. Follow standard piping practices and include all accessories as necessary.

Piping connection knockouts are shown in Figure 5, p. 13 through Figure 9, p. 17. Field connection types and sizes for units without piping packages are listed in Tab l e 10 ,

p. 23.

Table 10. Coil data for field piping

Coil Type Connection Location Field Connection Size

4-pipe chilled water / hot water

2-pipe changeover coil Left or right 7/8 in. OD Hot water only Left or right 7/8 in. OD Steam Left or right 1 in. MPT Chilled water / electric

heat Chilled water / steam Left or right 7/8 in. OD / 1 in. MPT DX Left 7/8 in. suction, 3/8 in. DX / hot water Left cooling / right

DX / steam Left cooling / right

DX / electric heat Left cooling / right

Left or right (opposite ends)

Left cooling 7/8 in. OD

heating

7/8 in. OD / 5/8 in. OD

7/8 in. suction, 3/8 in. / 5/8 in. OD

7/8 in. suction, 3/8 in. / 1 in. MPT

7/8 in. suction, 3/8 in. / NA

Trane Piping Packages (Option)

Trane Standard Piping Package includes a two- or threeway valve with bypass balance valve, ball valves, Pete’s plugs, and unions. A strainer and circuit balancing valve are optional.

All union connections should be tightened in the field. Units are shipped with union connections hand-tightened only in the factory.

Notes:

• All connections made in the field should be sweat

connections.

• Piping packages are not shipped insulated. Any

insulation should be provided in the field by the installing contractor.

Split System Units

The following refrigerant piping and interconnecting wiring instructions apply to unit ventilators with direct expansion type cooling coils used in conjunction with aircooled condensing units. Reference must also be made to the condensing unit installation and wiring manuals which are shipped with the condensing unit.

Note: A UL listing mark applied to a unit ventilator does

not apply to any associated refrigerant condensing unit.

Refrigerant Piping

A 3/4-in. OD condensate drain connection is provided on the chilled water supply end of the unit. Attach a flexible condensate drain hose over the drain pan connection and secure with a hose clamp.

Figure 14. Condensate drain pan location

The drain pan on the horizontal unit is internally pitched. To field reverse, remove the screws and drain pan, rotate the pan and reinstall.

After the condensate drain piping has been completed, check water flow to be sure the system properly carries and away all condensate accumulation.

A P-trap is recommended for installations that drain directly into a sewer system. A P-trap is not necessary for operation but will eliminate sewer gas odor.

UV-SVN02C-EN 23

WARNING

Hazard of Explosion and Deadly Gases!

Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where refrigerant may be present. Always remove refrigerant by following the guidelines established by the EPA Federal Clean Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Unit ventilators with direct expansion cooling are dehydrated and shipped with a dry air holding charge. Connections are “pinched off” at the factory.

To connect the condensing unit lines, cut off the stubouts and swage. The condensing unit lines can then be brought into the swage and brazed. Trane recommends the use of nitrogen purge when brazing refrigerant lines to prevent formation of oxides in the lines.

Page 24

Installation—Piping

Vacuum Equalizer

H= 12" minimum

F&T Trap

See text for sizing

Gravity flow to

vented receiver

Coil

To Condensate

return

Temp. Regulating Valve

Install the refrigerant suction and liquid lines as described in the condensing unit installation instructions. The thermal expansion valve (TXV) is factory-installed on the Unit Ventilator.

Note: The R-410A direct expansion (DX) refrigerant coil

includes a factory-mounted adjustable thermal expansion valve (TXV) set to 90 psig superheat and an equalizing tube.

Piping should be run straight out through the back of the unit. Access piping knockouts are located in the rear panels of the unit, as shown in Figure 5, p. 13 through

Figure 9, p. 17.

Recommended refrigerant line connections for various unit combinations are given in Table 9, p. 21. Typical Superheat Charging Charts are shown in the Trane Service Facts found in the condensing unit section manual. Refrigerant charge weights can also be determined with your local Trane account manager using a valid Trane Selection Program.

Steam Piping

When air, water or another product is heated, the temperature or heat transfer rate can be regulated by a modulating steam pressure control valve. Since pressure and temperature do not vary at the same rate as load, the steam trap capacity, which is determined by the pressure differential between the trap inlet and outlet, may be adequate at full load, but not some lesser load.

There are detailed methods for determining condensate load under various operating conditions. However, in most cases this is not necessary if the coils are piped as shown in Figure 15. Follow the procedure documented in the ASHRAE Systems Handbook, Steam Systems.

actuator 45° counter-clockwise (see Figure 16). The twoway valves are bi-directional flow. The three-way valves can be mixing or diverting (see Figure 17).

Note: The actuator must be removed if soldering is being

conducted near the valve. High heat may cause damage to the actuator’s plastic body/ mechanisms.

On applications without factory-installed piping packages (option), it is important to remove the cartridge assembly from the valve body with the provided tool (see Figure 18,

p. 25).

Figure 16. Remove modulating valve actuator by

pressing in tab (inset) and turning actuator 45° clockwise

Figure 15. Steam piping

Modulating Water Valves (Option)

The actuator on the valve is a 24 V, three-point floating valve. The actuator can be easily removed from the valve body by pressing in on the locking tab and rotating the

24 UV-SVN02C-EN

Page 25

Installation—Piping

Two-way valve

AB<->B

AB<->A

Three-way valve

Figure 17. Steam piping: two-way valve (top) and three-

way valve (bottom)

Closed

Open

Figure 18. Cartridge removal tool

Use the following steps to complete cartridge assembly removal:

1. Remove valve actuator.

2. Remove the cartridge assembly from the valve body

with the enclosed tool.

3. Solder the valve in accordance with normal soldering

practices.

4. Re-install the cartridge after soldering by tightening til it bottoms out. The top surface of the cartridge

un will be flush with the top edge of the body casting.

Note: D

5. Replace valve actuator and wire in accordance with

instructions

o not over-tighten. Maximum torque is 40

in·lb.

UV-SVN02C-EN 25

Plumbing

The valve may be plumbed in any angle but preferably not with the actuator below horizontal level of the body. Make sure there is enough room around the actuator for servicing or replacement.

For use in diverting applications, the valve is installed with the flow water entering through the bottom AB port and diverting through end ports A or B. In mixing applications the valve is installed with inlet to A or B and outlet through AB.

Mount directly to the tube or pipe. Do not grip the actuator while making or tightening plumbing connections. Either hold valve body by hand or attach an adjustable spanner (38 mm/1-1/2”) across the hexagonal or flat faces on the valve body (see Figure 19, p. 26).

Page 26

Installation—Piping

Figure 19. Proper plumbing technique for modulating

valves

Manual Opener

The manual opener can be manipulated only when in the up position. The A port can be manually opened by firmly pushing the white manual lever down to the midway position and pushing the lever in. In this position, both A and B ports are open. This “manual open” position may be used for filling, venting and draining the system or opening the valve during power failure.

The valve can be closed by depressing the white lever lightly and then pulling the lever outward. The valve and actuator will return to the automatic position when power is restored.

Note: If the valve is powered open, it cannot be manually

closed, unless the actuator is removed.

Figure 20. Proper mounting for isolation valves

Servicing/Removal of Valves

The actuator can be removed from the valve body. Removing the actuator is recommended of soldering is being conducted near the valve.

To remove the actuator:

1. Place the manual operating lever in the Open position

(see Figure 21, p. 26).

Figure 21. Removing isolation valve actuator

Typical floating controller is an SPDT controller with a center-off position. On a change in temperature from the set point, the controller will close the NO or NC contacts, driving the valve to an intermediate position until a further change at the controller.

The valve is set between the limits of the controller to satisfy various load requirements. In the event of power failure, the valve will stay in the position it was in before loss of power. When power is restored, the valve will again respond to controller demand.

Isolation Valves

Installation

The valve can be mounted in any position on a vertical line. If the valve is mounted horizontally, the actuator must be even with or above the center line. Make sure there is enough room to remove actuator cover for servicing. Mount the valve on the tube or pipe.

Note: Make sure the flow through the valve is in the

direction indicated by the arrow stamped on the valve body.

2. Depress the locking button and lift actuator until it

separates from the valve body.

To install the actuator to the valve body:

1. Align the slot on the shaft of the valve with the valve

body notch on side of body (see Figure 22, p. 27).

26 UV-SVN02C-EN

Page 27

Installation—Piping

Figure 22. Installing isolation valve actuator

2. Install body valve into pipe.

3. Wiring connections may be made either before or after tor installed on body.

actua

4. Place the manual operating leve

OPEN position.

5. Align actuator coupling to slot on the shaf

body and fit the head onto the valve body to ensure the shaft seats correctly (see Figure 22).

6. Press the actuator and valve body until it secures

together

Soldering procedures are as follows:

. Remove actuator as stated earlier.

2. Place valves on the pipe. Rotate valve stem so the shaf

slot points at the notch in the side of the body (90O to flow direction). This protects the plug inside the valve by removing it from the seat (see Figure 23).

r on the actuator in the

t of the valve

Heating Coils with Direct Expansion Cooling

Heating options for direct expansion cooling in the unit ventilator are hot water, steam or electric heat.

These coils facilitate direct expansion cooling with standard capacities. The supply and return connections are located in the right hand end pocket. Hot water field connections are made with a 5/8 in.\[15.9\] OD male sweated joint, while steam coils have a 1 in.\[25.4\] male pipe thread (MPT) connection (see Tab l e 10 , p . 2 3 ).

Electric heat coils provide a third way to supply heating to the direct expansion cooling. The coil utilizes three to six preheat elements which are factory-wired.

Figure 23. Preparation for soldering

3. Sweat the joints, keeping outer surface free from

solder.

Note: Do not use silver solder due to high

temperature requirements.

UV-SVN02C-EN 27

Page 28

Installation—Sensors

X13790822-04 (wall) X13790855-01 (unit)

X13790492-01 (wall) X13790855-01 (unit)

X13790842-01 (wall) X13651467-02 (comm)

X13790843-01 (unit)

X13511527-01 (wall) X13790849-01 (unit) X13651467-02 (comm)

X13511529-01 (wall) X13790849-01 (unit) X13651467-02 (comm)

Control Options

Figure 24. Wireless temp sensor with display

(SP, OALH, COMM) Digit 19 = 3

Figure 25. Wireless temp sensor

(SP, OALMH, COMM) Digit 19 = 4

Figure 27. Unit mtd temp sensor

(SP, OALH, COMM) Digit 19 = L

Figure 28. Split mtd zone sensor, unit mtd fan speed

switch, and wall mtd setpoint dial with On/Cancel Digit 19 = P

Figure 26. Wall mtd temp sensor

(SP, OCC/UNOCC, OA, LMH, COMM) Digit 19 = J

28 UV-SVN02C-EN

Figure 29. Split mtd zone sensor,

unit mtd fan speed switch, and wall mtd setpoint dial Digit 19 = Q

Page 29

Installation—Sensors

X13790841-01 (wall) X13651467-02 (comm)

X13790886-04 (wall) X13651467-02 (comm)

Figure 30. Wall mtd temp sensor

(SP, OALMH, COMM) Digit 19 = K

Figure 31. Wall mtd display temp sensor

(SP, OCC/UNOCC, OALMH, COMM) Digit 19 = M

Figure 32. Wall-mounted wired and wireless zone

sensor dimensions

Installing Wall-Mounted Wired Sensors

Reference the wall-mounted zone sensor dimensions in

Figure 32, p. 29. Position the sensor on an inside wall three

to five feet above the floor and at least 18 inches from the nearest outside wall. Installing the sensor at a lower height may give the advantage of monitoring the temperature closer to the zone, but it also exposes the sensor to airflow obstructions. Ensure that air flows freely over the sensor.

1. 0.31 in

2. TYP R.07 in (R1.9)

3. TYP 0.24 in)

4. 2.9 in

5. 1.08 in

6. 0.12 in

7. 3.39 in

8. 4.68 in

9. 2.48 in

10. 0.6 3 i n

11. 1.45 in

12. 2.62 in

Sensor

When selecting a sensor location, avoid the following:

• Areas of direct sunlight

• Areas in the direct airstream of air diffusers

• Exterior walls and other walls that have a differential between the two sides

• Areas that are close to heat sources appliances, concealed pipes, chimneys, or other heatgenerating equipment

• Drafty areas

• Dead spots behind doors, projection screens, or

corner

• Walls that are subject to high vibration

• Areas with high humidity

• High traffic areas (to reduce acci tampering)

dental damage or

temperature

such as sunlight,

UV-SVN02C-EN 29

Page 30

Installation—Sensors

• Metal barriers between the receiver and the sensor (for example, plastered walls with metal lathe or metal roof decks)

• Thick, solid concrete walls between the receiver and the sensor

• Placing the sensor inside metal enclosures

Height Requirements

It is recommended that you mount the back plate a maximum distance of 54 inches above the floor. If a parallel approach by a person in a wheelchair is required, reduce the maximum height to 48 inches.

Note: Consult section 4.27.3 of the 2002 ADA (Americans

with Disability Act) guideline, and local building codes, for further details regarding wheelchair requirements.

Mounting Surfaces

Using the hardware provided, mount the back plate of the sensor to a flat surface such as sheetrock or plaster, or an electrical junction box. The sensor must be mounted plumb for accurate temperature control and to ensure proper air movement through the sensor.

• If mounting onto sheetrock or plaster threaded anchors (pre-drilling holes is not usually necessary) and the two M3.5 x 20 mm mounting screws.

• For mounting onto an electrical junction box, use the two 6-32 x 3/4 in. screws.

Before beginning installation, consider the location

nsiderations below. Also, refer to the unit wiring

co schematic for specific wiring details and point connections.

, use the plastic

Location Considerations

Avoid mounting the sensor in an area subject to the following conditions:

• Dead spots, such as behind do not allow free air circulation.

• Air drafts from stairwells, outside doors, or

sectioned hollow walls.

• Radiant heat from the sun, fireplaces, appliances, etc.

• Airflow from adjacent z

• Unheated or uncooled spaces behind the controller,

ch as outside walls or unoccupied spaces.

• Concealed pipes, air ducts, or chimneys in partition

aces behind the controller.

ors or in corners that do

ones or other units.

Location Considerations for Wireless Zone Sensors

Placement of the sensor is critical to proper operation (the receiver is factory mounted on fan-coil units). For most installations, barriers limit proper radio signal strength more than distance. For best radio transmission range and

reliability, mount the receiver and sensor in line of sight. Where this is not possible, try to minimize the number of barriers between the pair of devices. In general, sheetrock walls and ceiling tiles offer little restriction to the transmission range for the sensor is as follows:

• Open range: 2,500 ft (packet error rate = 2%)

• Usable range: 200 ft

• Typical range: 75 ft

Fan Mode Switch Installation

The fan mode switch ships loose inside the unit accessory bag. Follow the steps below to install the fan mode switch.

Items needed:

2 x 4 electrical junction box

1. Remove the brown wire if not using a field-supplied damper.

2. Remove the terminals, cut and strip wires as required

r installation.

3. Level and position a 2 x 4 electrical

4. Follow the instructions given in “Wall-Mounted

Control Interconnection Wiring,” p. 41 and route the

wires as shown in the wiring diagram. R typical wiring diagram or to the unit specific diagram on the unit.

5. Position the fan mode switch over the junction box with the two screws supplied.

junction box.

efer to the

Zone Sensor Installation

Follow the procedure below to install the wired zone sensor module.

1. Note the position of the setpoint adjustment knob and gently pry the adjustment knob from the cover using the blade of a small screwdriver.

2. Insert the screwdriver blade behi of the module and carefully pry the cover away from the base.

3. To mount the sensor back plate:

a. Hold the back plate against the mounting surface

and ma

b. Secure the back plate against the mounting surface

using included hardware.

4. To install the zone sensor module to a standard

nction box:

a. Level and install a 2 x 4-in.

supplied) vertically on the wall.

b. Pull the control wires through the cutout. Attach the

module to the wall using the screws provided.

5. Strip the insulation on the i

0.25-inch and connect to TB1 (for wired sensors).

6. Screw down the terminal blocks (for wired sensors).

7. To replace the cover:

rk the screw locations.

nd the cover at the top

junction box (installer

nterconnection wires back

30 UV-SVN02C-EN

Page 31

Installation—Sensors

Security screw

a. Hook the cover over the top of the back plate. Apply

light pressure to the bottom of the cover until it snaps in place.

b. Install the security screw into the bottom of the

cover (if desired).

If installing a Tracer ZN520 zone sensor, see “Control

Options,” p. 28 for more information.

Figure 33.

Wireless Sensors

Notes:

• Receivers ship installed on the unit. To remove the

receiver, press in the retention tabs on the underside of the receiver enclosure (see Figure 35) and push upward.

• For more detailed information for wireless sensors, please refer to BAS-SVX04E-EN (Installation,

Operation, and Maintenance: Wireless Sensors, Models WTS, WZS, and WDS), or the most recent

revision

Figure 35. Retention tabs on underside of receiver

enclosure

Figure 34.

Address Setting

The process of establishing communication between a receiver and sensor is referred to as association. The following limitations apply:

• Each associated receiver/sensor set that communicates within the reception range of the wireless system must have a unique address.

It is not possible to associate more than one sensor to a receiver, nor is it possible to associate more than one receiver to a sensor.

To associate a receiver and sensor, the two devices must have their rotary address switches set to the same address.

Important: Set the addresses before applying power to

the receiver and before removing the insulation strip (Figure 36) from the sensor.

To set the receiver and sensor addresses:

1. Using a small screwdriver, set the three rotary address switches (locations S1, S2, S3) on the receiver to an address between 001 and 999 (see Figure 36). You do not have to remove the covers to access the rotary address switches.

UV-SVN02C-EN 31

Page 32

Installation—Sensors

GND

R77

C35

C33

LED4

LED1

LED2

LED3

LED5

C34

COMM -

24VAC/DC

SETPOINT

HEATING SET

SIGNAL

POWER

ADDDRESS

FAN/SYSTEM

ZONE

COMM +

INSTALL

WIRELESS

GND

LED3

ED2

Receiver

B1 +

INSTALL

WIRELESS

ADDRESS

STATUS

BATTERY

LED5

SIGNAL

LED3

ED2

LED1

Pb-FREE

STATUS

LED4

Do not remove the insulation strip yet.

Sensor

Sec.

LED3

Note: Do not use 000 as an address. An address of

000 returns the receiver outputs to their factory defaults (zone temperature and setpoint outputs: 72.5°F, removes all association knowledge, and prevents association with a sensor.

Figure 36. Setting the rotary address switches on the

receiver and the sensor

Note: D

o not use 000 as an address. An address of 000 removes all association knowledge, reverts the sensor to a low-power hibernation mode, and sends a disassociation request to the receiver.

3. Record the address and location of the re

ceiver and

sensor pair.

Observing the Receiver for Readiness to Associate

After initial power up, the receiver conducts a channel scan for 20 seconds. During this time, the receiver selects from 16 available channels the clearest channel on which to operate. LED1, LED2, and LED3 flash rapidly in succession (round-robin style) while the channel scan is in progress, as shown in part 1 of the illustration.

Important: Do not attempt association (leave the

insulation strip in place) until the channel scan is finished.

After the channel scan is finished, LED3 begins blinking (one-blink pattern) to show that the receiver is ready to be associated with a sensor (see part 2 of the following figure).

2. Set the three rotary address switches (locations S1, S2, S3) on the sensor to the same address as the receiver (see Figure 36).

32 UV-SVN02C-EN

Associating the Sensor to the Receiver

To associate the sensor to the receiver:

1. Remove the sensor cover by firmly pressing the thumb tab at the bottom of the cover and pulling the cover away from the back plate.

2. Verify that the sensor is set to the sam

e address as the

receiver it is to be associated with.

Page 33

3. Power the sensor by removing the insulation strip from

Model WZS sensor

Push firmly, then release

Test button

Model WDS sensor

Test button

Push firmly, then release

between the two batteries.

Installation—Sensors

LED1 LED2 LED3

LED5

Association is autom and the receiver. When LED3 on the receiver stops blinking, association has been established.

If the first association attempt is unsuccessful, the sensor automatically re-attempts association with the receiver every 10 minutes.

Note: An associated sensor that has lost communication

with the receiver will transmit an association request every 50 minutes. You can manually initiate association (see “Manual Association

(Wireless Controls),” p. 97”).

Testing Signal Strength and Battery Status

To verify that the association process was successful and that the batteries have adequate charge:

1. Firmly press and release the Test button on the bottom of the sensor (as illustrated below).

2. For model WZS, view LED1, LED2, and LED3 to

etermine the signal strength. View LED5 to determine

d the battery status (see the following figure for model WZS sensors).

Note: Th

For model WDS, determine the signal strength and battery status by viewing the symbols on the sensor display (see the following figure for model WDS sensors).

3. Record the results in your commissioning statem

Note: For more information, see “Testing Signal Strength

(Wireless Controls),” p. 95 and “Testing Battery Status (Wireless Controls),” p. 96.

atically initiated between the sensor

e LEDs will turn Off after 5 seconds to

conserve battery strength.

ent.

UV-SVN02C-EN 33

Page 34

Installation—Sensors

Configuration button

Center button

Configuring the Wireless Display Sensor (Model WDS only)

Note: Sensors shipped with the fan-coil are pre-

configured for three speeds.

The configuration of the sensor determines which system features can be accessed and changes can be made by the tenant (for example, changes to cooling/heating mode, setpoint, or fan speed. Verify system and associated unit features before configuring the sensor.

The building owner or operator may choose to limit tenant access to certain features. This can be done through configuration. Or, if a sensor is configured to match all control capabilities of the building automation system, the locking feature can be used to restrict the tenant from making changes.

Configuration Procedure

To configure settings on the model WDS sensor, follow this procedure in the order presented.

1. Press the configuration button for 3 seconds.

3. Configure the sensor options in the order shown in the table.

• Press or to scroll to the next selection (as

illustrated).

• Press or to move to the next menu (as

illustrated).

The display will change to configuration mode. When the sensor is in configuration mode, a wrench symbol appears on the display and the menus are separated by lines, as illustrated below.

2. Press the center button on the keypad to begin the configuration process.

34 UV-SVN02C-EN

Page 35

dual setpoint

setpoint

single

setpoint

auto/off/low

med/high

auto/off/

low/high

auto/off

off/high (on)

off/low/high off/low/

med/high

no fan options

enabled

(Default)

Setting Configuration Options

Temperature

• Choose Fahrenheit or Celsius

• Choose the degree resolution (whole degrees, half degrees, or tenths of degrees).

Setpoint

System

. .

no system

options enabled

Fan

Installation—Sensors

Note: Not all fan options are available

for all systems.

Occupancy (timed override)

4. Review the display to ensure that you have selected the correct configuration.

5. To return the display to op

erating mode, press the

configuration button (see Step 1, p. 34).

Note: T

he sensor will revert to operating mode if no

buttons are pressed for 10 minutes.

UV-SVN02C-EN 35

Page 36

Installation—Sensors

Arrow indicates setpoint is shown on display

Setpoint

Fan menu

Optional Features

Displaying Setpoint or Temperature. You c an

configure the sensor to display either the temperature (default) or setpoint. To select either option:

1. Verify that the sensor is in operating mode and at the home screen.

2. Press the up and down arrows for 3 seconds. The arrow indicates setpoint display, as shown in the figure.

Locking or Unlocking Settings. You can lock or unlock

the setpoint, system, or fan setting to prevent changes.

To lock or unlock a setting:

1. Verify that the sensor is in operating mode and at the home screen.

2. Choose a setting to lock or unlock:

elect the setpoint by pressing the up or down

• S

arrow.

• From the system menu press the down arrow to

select the fan menu. Use the left or right arrow to choose the setting.

3. Press the left and right arrows for 4 seconds.

Note: If you

try to access a feature that is locked, the locked symbol will appear on the display. If you press a keypad button to try change a locked setting, the locked symbol will flash.

Sensor Operations

Temporary Occupancy (Timed Override)

Temporary occupancy (timed override) is available on model WDS. Temporary occupancy is selected for afterbusiness-hours adjustment of temperature setting, fan settings, or heat/cool settings, when the system has changed to unoccupied mode. System control will revert to unoccupied after a pre-determined time period.

Note: Not all systems support the occupancy function.

Model WDS Sensor

To request and cancel temporary occupancy on a model WDS sensor, see “Requesting Temporary Occupancy,”

p. 38.

End-of-Range Temperature Values

Receiver: The end-of-range temperature limits of the

receiver for all models are 32°F to 122°F. The receiver cannot replicate temperature values outside this range. If the sensor transmits a temperature value to the receiver that is out of the receiver replication range, the receiver will “freeze” the output at the end-of-range values. This value will remain frozen until the transmitted temperature moves to between the end-of-range temperature limits.

Sensor: The end-of-range temperature setpoint limits for the model WDS sensor is 50°Fto 89.6°F.

Receiver Power-up Sequence

When power is applied to the receiver, one of the following sequences occurs. The sequence is dependent on the address setting and the association status of the receiver.

Address set to 000 and receiver is not associated with a sensor

• LED5 is constantly On, indicating power is applied and the recei

• All models: Zone temperature and cooling setpoint default to 72.5° WDS only: Th the fan/system output will be 2230 Ω. (

Values—Failure and Default Modes of Operation (Wireless Controls),” p. 99).

• Status LED3 will display a 2-bl

Address set from 001 to 999 and receiver is not

ssociated with a sensor

• LED5 is constantly On, indicating power is applied and the recei

• All models: Zone temperature and cooling setpoint default to 72.5° WDS only: Th the fan/system output will be 2230 Ω. (

ver is functional.

e heating setpoint defaults to 70.5°F and

see “Outpu t

ink pattern diagnostic.

ver is functional.

e heating setpoint defaults to 70.5°F and

see “Outpu t

36 UV-SVN02C-EN

Page 37

Installation—Sensors

Keypad

Test button

Test symbols (appear only when Test button is pushed

Occupancy indicator/Error code

Temperature

System settings (not available for fan-coil or Force-Flo units)

Fan settings

Values—Failure and Default Modes of Operation (Wireless Controls),” p. 99).

• The receiver conducts an energy scan determine the clearest channel on which to operate.

• LED3 flashes On every 2 seconds when it is ready to accept a sensor association reque association request is made by a sensor, the receiver instructs the sensor on which power level to operate. Then the receiver and sensor begin operation at the appropriate channel and power level (see “Observing

the Receiver for Readiness to Associate,

Address set from 001 to 999 (and not changed since

st recent power-up) and receiver is associated

mo with a sensor

• LED5 is constantly On, indicating power is applied and

ceiver is functional.

the re

• Zone temperature and setpoint de only: Heating setpoint defaults to 70.5°F, Fan = Auto, System = Off.

• The receiver waits for a broadcast transmiss its associated sensor. When a transmission is received, the receiver positions its zone temperature and setpoint outputs appropriately.

• If the receiver does not receive a communicated signal from its associated sensor within temperature and setpoint outputs fail, generating a unit controller alarm (see “Output Values—Failure and

Default Modes of Operation (Wireless Controls),” p. 99).

Note: Once

the receiver disables (opens) its zone setpoint output indefinitely.

Sensor Transmission Time and Temperature Varia bl es

Sensor transition time variables are as follows:

• The maximum time between sensor temperature transmissions is 1

• The minimum time between sensor temperature transmissions is 30 seconds.

• The minimum time for tra setpoint changes is 10 seconds.

Note: If a

Sensor temperature time variables are as follows:

• The minimum change in zone tem

sensor transmits a message to the receiver and the receiver does not reply, the sensor will retransmit the message to the receiver every 30 seconds until communication to the receiver is reestablished.

force a sensor transmission is:

– 0.2°F when the temperature

and 80°F

for 20 seconds to

st. When an

” p. 32).

fault to 72.5°F. WDS

ion from

35 minutes, zone

a receiver communicates to a WZS sensor,

5 minutes.

nsmitting temperature

perature required to

range is between 60°F

– 0.5°F when the temperature range is between 32°F

and 60°F or between 80°F and 122°F

• The minimum change in temperature setpoint equired to force a sensor transmission is:

– 0.1°C for a model WDS sensor

Operating Mode (Model WDS)

This section describes how to operate the Trane wireless sensor, model WDS. Figure 37 shows an example of a model WDS that has been configured and is in operating mode.

Figure 37. Wireless sensor (model WDS) in operating

mode

Changing Room Temperature

This symbol shows the current room temperature, or your setpoint selection while you are making an adjustment.

When you select a setpoint, this symbol appears.

1. To increase the room temperature, press

To decrease the room temperature, press

2. To confirm, press

or wait 5 seconds. The display will return to the home screen.

UV-SVN02C-EN 37

Page 38

Installation—Sensors

Changing Heating and Cooling Room Temperature Settings (applies to some systems)

Some systems allow you to select both heating and cooling room temperature settings. If your system has this option, this symbol appears when you adjust the temperature setting.

When you adjust the cooling setting, the top arrow and snowflake flash.

When you adjust the heating setting, the bottom arrow and flame flash.

1. Press or to select the heating/ cooling setting.

2. If in cooling mode, press to change to heating mode. If in heating mode, press to change to cooling mode.

3. Press or to select the heating/ cooling setting.

4. To confirm, press or wait 5 seconds. The home screen will appear.

Changing the Fan Setting

Indicates that the fan will operate as needed to reach the selected temperature.

Indicates that the fan setting is On. The number of arrows indicates fan speed (3: high, 2: medium, 1: low). The example shown indicates a fan on high speed. Not all systems offer all three speeds.

Indicates that the fan setting is Off.

1. From the home screen, activate the fan setting menu by pressing and then .

2. Press or to choose the desired fan setting.

3. When the symbol for the desired setting appears, confirm your choice by

• Pressing (the

home screen will appear), or

• Pressing or

(the next menu

will appear), or

• Waiting five seconds.

Requesting Temporary Occupancy

Select to request occupancy

Select to cancel occupancy

• If you need heating or cooling after normal business hours, you can “request” temporary occupancy by pressing and holding it for 2 seconds. The occupied symbol remains on the screen and the unoccupied symbol disappears. After 30 seconds, the unoccupied symbol will re-appear.

• To cancel temporary occupancy, press and hold for 2 seconds. The unoccupied symbol will remain on the screen and the occupied symbol will disappear. After 30 seconds, the occupied symbol will re-appear.

Error Codes

Indicates an error code

If an error code (E0–E7) is displayed, technical assistance may be required.

Lock Symbol

Indicates that a setting is locked

The lock symbol appears if you try to adjust a setting that cannot be changed.

Testing Signal Strength

Indicates excellent signal strength

Indicates satisfacto ry signal strength

Press the Test button to display the signal strength symbols.

Indicate s poor signal strength

Testing Battery Status

Indicates full battery power

Press the Test button to display the battery status symbols. Use only UL-listed non-rechargeable 1.5 V lithium AA batteries

(Trane p/n X13770035010 or equivalent).

Indicates 50% of battery life left.

Indicates 25% of battery life left. Replace batteries.

Flashing symbol indicates that approximately 14 days of operation remain.

38 UV-SVN02C-EN

Page 39

Wireless Sensor Specifications

The following table presents specifications for all models of the wireless sensor sets.

Sensor operating temperature 32°F to 122°F Receiver operating temperature -40°F to 158°F Storage temperature -40°F to 185°F Storage and operating humidity

range Accuracy 0.5°F over a range of 55ºF to 85°F Resolution 0.125°F over a range of 60°F to 80°F

Setpoint functional range (WDS only)

Receiver voltage 24 V nominal ac/dc ±10% Receiver power consumption <1 VA Housing Polycarbonate/ABS blend, UV

Mounting 3.24 in (8.26 cm) for 2 mounting

Sensor battery (2) AA, 1.5 V, 2800 mAh, lithium,

(a)

Range

Output power 100 mW Radio frequency 2.4 GHz (IEEE Std 802.15.4-2003

Radio channels 16 Address range 000 to 999 Minimum time between

transmissions Maximum time between

transmissions

(a) Range values are estimated transmission distances for satisfactory op-

eration. Actual distance is job specific and must be determined during site evaluation.

5% to 95%, non-condensing

0.25°F when outside this range 50°F to 89.6°F

protected, UL 94-5VA flammability rating, suitable for application in a plenum

screws (supplied)

5-year life, UL listed Open range: 2,500 ft (762 m)

(packet error rate = 2%) Usable: 200 ft (61 m) Typical: 75 ft (23 m)

compliant) (2405 to 2480 MHz, 5 MHz spacing)

30 seconds

15 minutes

Installation—Sensors

UV-SVN02C-EN 39

Page 40

Installation—Sensors

The following table presents agency compliance information for wireless sensor set models as shown.

United States compliance (all models)

Canada compliance (all models)

IEEE compliance for radio frequency range (all models)

UL listed: UL 94-5VA Flammability rating UL 916: Energy management equipment

FCC CFR47, Section 15.247 & Subpart E Digital Modulation T ransmission with no SAR (FCC Identification TFP-

13651127) This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received, including interference that may cause undesired operation. Warning: Changes or modifications not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment. 20 cm separation distance: T o comply with FCC’s RF exposure limits for general population/uncontrolled exposure, the antenna(s) us ed

for this transmitter must be installed to provide a separ ation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

CSA22.2 No. 205-M1983 Signal Equipment Industry Canada (Certification no: IC: 6178A-13651127)

Industry Canada statement: the term “IC” before the certification/registration number signifies only that the Industry Canada technical specifications were met. Section 14 of RSS-210: The installer of this radio equipment must ensure that the antenna is located or pointed such that it does

not emit RF field in excess of Health Canada limits for the general population. IEEE 802.15.4-2003, IEEE Standard for Information Technology—Telecommunications and information

exchange between systems—Local and metropolitan area networks—Specific requirements, Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low Rate Wireless Personal Area Networks (LR-WPANs)

40 UV-SVN02C-EN

Page 41

Installation—Electrical

Wiring

All classroom unit ventilators have 115 V motor power. Motor data can be found in Ta b l e 11 and Ta b l e 1 2 :

Table 11. UV Standard motor data

Unit Size Volts RPM CFM Amps

75 115/60/1 1050 750 1.3 135 1 100 115/60/1 1050 1000 1.3 180 1 125 115/60/1 1050 1250 1.3 191 1 150 115/60/1 1050 1500 1.3 221 1 200 115/60/1 875 2000 1.3 311 1

(a)Data typical for AA coil.

Table 12. Hi-ESP Motor data

Unit Size Volts RPM CFM Amps

75 115/60/1 1330 750 13 198 1 100 115/60/1 1330 1000 13 287 1 125 115/60/1 1330 1250 13 305 1 150 115/60/1 1330 1500 13 357 1 200 115/60/1 1330 2000 13 770 1

(a)Data typical for AA coil.

(a)

Watts (FLA) HP

(a)

Watts (FLA) HP

Electrical Wiring

Unit Wiring Diagrams. Specific unit wiring diagrams,

based on unit options ordered, are provided inside each unit and can be easily removed for reference. Use these diagrams for connections or trouble analysis. Wiring diagrams are attached on the inside of the front panel of the unit.

Supply Power Wiring. Refer to the unit nameplate to

obtain the minimum circuit ampacity (MCA) and maximum fuse size (MFS) or maximum circuit breaker (MCB) to properly size field supply wiring and fuses or circuit breakers. Refer to the unit operating voltage listed on the unit wiring schematic, submittal, or nameplate. Reference the wiring schematic for specific wiring connections.

Note: All field wiring should conform to NEC and all

applicable state and local code requirements. The control panel box is always on the end opposite the piping connections. Access the control box by removing the two screws that secure the front cover. This will allow the panel to be removed, to provide access to the electrical components.

If the unit does not have a disconnect switch, the power leads and capped ground wire are inside the control panel. If the unit has a disconnect switch, the power leads are wired to the junction box switch on the control panel. Pull the capped ground wire into the junction box.

Electrical Grounding Restrictions. All sensor and

input circuits are normally at or near ground (common) potential. When wiring sensors and other input devices to the Tracer controller, avoid creating ground loops with grounded conductors external to the unit control circuit. Ground loops can affect the measurement accuracy of the controller.

All input/output circuits (except isolated relay contacts and optically isolated inputs) assume a grounded source, either a ground wire at the supply transformer to control panel chassis, or an installer supplied ground.

Wall-Mounted Control Interconnection Wiring. The

installer must provide interconnection wiring to connect wall-mounted devices such as a fan mode switch or zone sensor module. Refer to the unit wiring schematic for specific wiring details and point-to-point wiring connections. Dashed lines indicate field wiring on the unit wiring schematics. All interconnection wiring must conform to NEC Class 2 wiring requirements and any state and local requirements. Refer to the following table for the wire size range and maximum wiring distance for each device.

Important: Do not bundle or run interconnection wiring

in parallel with or in the same conduit with any high-voltage wires (110 V or greater). Exposure of interconnection wiring to high voltage wiring, inductive loads, or RF transmitters may cause radio frequency interference (RFI). In addition, improper separation may cause electrical noise problems. Therefore, use shielded wire (Belden 83559/83562 or equivalent) in applications that require a high degree of noise immunity. Connect the shield to the chassis ground and tape at the other end.

Note: Do not connect any sensor or input circuit to an

external ground connection.

Supply Power. Power supply wiring is to be connected

to terminals 1 and 2 at the junction box in the left end pocket, below the discharge air grille.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Electric Heat Units

Supply Power. Supply power wiring is to be connected

to the following line terminals in the right-hand end pocket:

• 208V or 240V, 3-phase, 3-wire system: L1, L2, and L3

UV-SVN02C-EN 41

Page 42

Installation—Electrical

IMPORTANT:

INSTALLER MUST MOUNT THERMAL EXPANSION VALVE BULB AND FROST PROTECTION BULB (if suppled) TO SUCTION LINE AFTER CONNECTION OF FIELD REFRIGERANT PIPING

X39001939010A

93:00

4:00

8:00

9:00

MOUNT BULB IN HORIZONTAL PLANE

RECOMMENDED BULB PLACEMENT

• 480V, 3-phase, 4-wire system: L1, L2, L3, and N (neutral)

Note: T

he supply neutral wire must be connected to the

neutral terminal block.

Operational controls and an electric heating safety device are factory mounted. The safety device is a high temp cutout which de-energizes electric heating elements through the K1 safety contactor.

Heating Coils with Direct Expansion Cooling

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Wiring. A typical unit ventilator with DX coil includes an

outside air thermostat, a frost prevention thermostat and a 24 V transformer for condensing unit control.

Wire sizing is the same as given for the thermostat wiring in the condensing unit installation instructions, or may be obtained from the nameplate. The condensing unit must be controlled by the same room thermostat that also controls the Unit Ventilator.

Figure 38. Frost stat/TXV valve bulb installation tag

Split System Start-Up. After all piping and wiring has

been completed, follow the instructions provided with the condensing unit for control testing and system start-up. If sweat-type field-piped systems are being used, then pressure testing, evacuation and refrigerant charging will be required.

Two bulbs will also be shipped with a split system unit:

1. Frost stat bulb

2. TXV valve bulb

Both components are to be field installed. For complete installation instructions and locations, refer to the tag attached to the unit. See Figure 38, p. 42 for an example of the installation tag.

Note: Depending on the controls package ordered with

the unit, not all installations will require mounting the frost stat bulb.

42 UV-SVN02C-EN

Page 43

ECM Overview and Setup

Note: Display and Menu/

Enter, Increase, and

Decrease Buttons

Overview

This section addresses changes to unit ventilators, integrating new Trane Brushless DC motors and controllers. This exciting new series delivers outstanding comfort, safety, and performance with greatly reduced energy consumption compared to traditional units with permanent split capacitance AC motors.

The new series of units will provide a long service life with proper installation and operation. The new system provides a high degree of flexibility and configurability, but the simplicity of customized factory configuration appropriate to most installations.

Very little intervention is needed by service and installation personnel in most applications; however, installers must read through the entire document before beginning installation of the new equipment.

This literature focuses on unit motors and controls, including three new circuit modules developed specifically for this series.

General Information

There are four primary components that enable the technology on your product:

1. Tr an e B LD C Mo t or

2. ECM Engine Board

3. Adapter Board

4. CSTI Adapter Board

The motors and modules are co cannot work without each other.

mbined as systems, and

• The BLDC motor has integrated electronics, overload protection and short circuit protection. The motor contains no user-serviceable components inside.

NOTICE:

Equipment Damage!

The motor harness attached to the single plug to which the motor mates contains the very important motor voltage jumper and should not be modified or substituted. Failure to follow this instruction could result in equipment damage.

• The motor mates to the unit electrically via a single plug that contains both the operating voltage and the control signals that are needed for correct operation.

• The BLDC motor comes a single shaf all horizontal unit ventilator sizes (075, 100, 125, 150,

200).

• The BLDC motor has two voltage variations, 115/208-230V and 277V. Units with three-phase and neutral L-L). The 115/208-230V is configured for voltage by use of an external jumper. If the jumper is present the motor will be configured for use with 115V. The jumper must NOT be present for use with 208-230V.

have motors wired to the L-N (as opposed to

t configuration for

ECM Engine Controller

Figure 40. ECM engine controller

Trane BLDC Motor

Figure 39. Trane BLDC motor

1. High Efficiency Brushless DC (BLDC) Motor Core

2. Motor Base Housing Potted Electronics Package

UV-SVN02C-EN 43

• The ECM engine controls and reports the performance of up to two Trane BLDC motors.

• The engine also co-ordinates the in response to electric heat behavior, and electric heat behavior in response to hydronic heat behavior and fan behavior.

• The engine incorporates a user interface that allows

djustment of certain unit parameters and provides

a constant feedback on motor operation.

• The engine integrates service and troubleshooting

ls, including high-precision tachometers, fan

too status, and electric heat-enable indicators.

operation of the fan

Page 44

ECM Overview and Setup

Note: Customer Low-

Voltage Interface for Fan Speeds, Variable Fan Speed, and 24 Vac Supply

• The engine integrates a versatile configurable auxiliary temperature sensor.

• The engine incorporates various safety and lockout features, suc electric heat is called for.

h as maintaining proper fan speeds, if

Standard Adapter Board

Figure 41. Adapter board

• The adapter allows direct customer interfacing through the use of terminal strips. Standard interfacing includes:

– Fan Speeds (H, M, L) (for w

switches)

– Variable speed (0–10V) inputs

• The standard adapter board elim wiring harnesses in the panel and allows simple, mistake-proofed single-plug interfacing of:

– The ECM engine controller

Transformers

–

–Motors

– Valves

–Dampers

– Electric heat control

– Fan speed switches

– Main Power (except electric heat).

• Electric heat lockout circuits an for electric heat are standard, and are pre-configured at the factory.

all mounted fan speed

inates many separate

d fan proving circuits

CSTI Adapter Board

Figure 42. CSTI adapter board

1. Customer Low-Voltage Interface for Valves, Electric Heat, Dampers, Fan Speeds, Variable Fan Speed, and 24 Vac Supply

2. Valve(s), Electric Heat, and Changeover Configuration Switches (FactorySet)

• Performs all the functions of the standard adapter module, but in addition, provides convenient field connections to factory mounted end devices, including:

– Valves

ampers

–D

– Electric Heat

• Performs courtesy “ to match selected valves:

– Standard thermostats put out only “on” signals,

however customer may select a normally open valve. A selectable switch allows the customer to invert the thermostat outputs for correct operation. These switches are set at the factory, but can be adjusted in the field.

– Sophisticated changeover function when used with

a thermistor, that replaces traditional bi-metallic disc temperature switches:

• Board will automatically honor only the

appropriate customer request (Heat/Cool) depending on sensed water temperature.

• Feature can be enabled or disabled with a

selector switch—however, it is set correctly at the factory, based on customer choice of coil.

• The bi-metallic disc temperature switch

emulation is programmable, and dead-band range can be adjusted.

• Electric heat lockout circuits and fan proving

circuits for electric heat are standard, and are pre-configured at the factory.

inversion” of thermostatic inputs

44 UV-SVN02C-EN

Page 45

Installation and Initial Setup

WARNI NG

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

ECM Overview and Setup

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The BLDC motors contain capacitors which store residual energy. Please keep clear of the fan wheels for 5 minutes after the power has been removed from the system, as a power request with the motor powered off, could result in a very short period of actuation.

• All settings take effect immediately, including fan startup and enabling of electric heat. Caution should be taken to s tay c l ear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

• The adapter boards contain high voltage. Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

• Changes to switch settings on the CSTI adapter board take effect immediately. Changes should be made to the CSTI configuration switches with the power off.

• Initial hookups to the CSTI and Standard Adapter board, including low voltage interconnections, must be made with the power off.

• Do not make connections to the motors or the adapter boards while power is ON. Do not remove connections to the motor or the adapter boards while the power is ON.

• Do not free spin the fan wheels with your hands while the unit is powered on. The system is constantly scanning and responding to the operational status of the motors.

UV-SVN02C-EN 45

Installation and Initial Setup

Note: Normally, the Trane BLDC motors are configured

for soft ramps and transitions between speeds. However, to aid in commissioning of the unit, for approximately 10–15 minutes, the ramps will be shortened to quickly observe proper unit behavior and response to speeds.

For new installations, all boards and motors are preinstalled and pre-configured according to the unit configuration, indicated by its model number.

Under normal and intended operation, the only required intervention specific to the new BLDC units is the wiring of:

Page 46

ECM Overview and Setup

321 543 21

• Wall-mounted low-voltage fan speed switch inputs to the adapter boards’ terminal strips and 24 Vac tap to field-installed fan speed

• Field-supplied controllers/therm

switch.

ostats to the adapter

boards’ terminal strips and 24 Vac power tap to

eld-supplied controller/thermostat.

• Adjustment and calibration of the

variable speed

inputs (VSP/0–10V) on the system.

• Adjustment, calibration or disabling of the optional

to-changeover function on CSTI units.

Otherwise, proceed with the mechanical, electrical and controls installations as defined in other sections of this manual, while obeying the warnings communicated in this section.

Proceed with the power on after installation, as defined in the other sections of UNT-SVX07B-EN.

Wall Mounted Low Voltage Fan Speed Switch/ Customer-Supplied Controller/Thermostat Instructions

WARNI NG

Hazardous Voltage w/Capacitors!

WARNI NG

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• Hook ups to the adapter boards should be made only with the power off to the unit.

• Only connect Class 2 voltages to the terminal blocks on the adapter boards that share a common with the unit mounted low-voltage transformer.

• Secure low voltage connections firmly to terminal strips, and strain-relieve all low voltage connection to prevent accidental detachment and possible shortcircuiting of high voltage components. Care should be taken to avoid contact of low voltage wiring to the back side of the adapter boards, which contain high voltage.

Note: Specifications subject to change without notice.

Consult the unit submittals and unit schematics before determining hookup requirements to the fan-coil unit. Terminal block positions, polarities and assignments are determined for specific unit configurations only. Signal assignments are indicated, for reference only.

Both adapter boards come equipped with integrated terminal blocks to hook up to the field supplied/mounted Fan Speed Switches and external controls. Connections should be made to the screw terminals with wires between 16 AWG and 24 AWG, with a ~4–5-mm wire strip length. The terminal blocks have 5-mm spacing, and are equipped with 3-mm screws. The field-supplied wires should have an insulation rating of 600V.

Standard Adapter Board Field Connections

Figure 43. Standard adapter board field connections

1. VSP 10V

2. VSP 0–10V

3. VSP DC COM

All customer connections to the two adapter boards are made to the terminal strips on both adapter boards.

Screw terminal blocks provide convenient access to fan controls for High, Medium, Low, and Variable speed. In addition, a courtesy 10 Vdc supply is provided for use with an external potentiometer or rheostat. The 10 Vdc supply supports up to 10 mA draw.

TB3 (right five positions) is normally used to provide 24V hookup to a wall mounted fan speed switch, and to accept the returns from the switch for High, Medium, and Low requests.

TB4 (left three positions) is normally used to control the system with a 0–10 Vdc output from a thermostat/ controller, or a fan control rheostat/potentiometer.

The terminal block functional assignments and polarity are shown for reference only, and the schematics that ship with each unit should be consulted before wiring. Wiring assignments are configured for each unit.

1. 24 Vac Y (gnd)

2. 24 Vac B (com)

3. High

4. Medium

5. Low

46 UV-SVN02C-EN

Page 47

ECM Overview and Setup

321

1098 7654 32

CSTI Adapter Board Field Connections

Figure 44. CSTI adapter board field connections

1. VS P 10 V

2. VSP 0–10V

3. VSP DC COM

1. 24 Vac Y (hot)

2. Damper Open

3. 24 Vac Y (gnd)

4. High

5. Medium

The CSTI adapter board provides all the hookups of the standard adapter board, but in addition provides hookups for valve control (main and auxiliary coils), electric heat control and damper control.

Screw terminal blocks provide convenient access to fan controls and to end device control. In addition, a courtesy 10 Vdc supply is provided for use with an external potentiometer or rheostat. The 10 Vdc supply supports up to 10 mA draw.

TB3 (right 13 positions) is normally used to provide:

1. 24 Vac supply to a wall fan speed switch or

2. 24 Vac supply to a field-installed unit-mounted controller, or a wall-mounted controller or thermostat

3. Inputs (returns) fo

r thermostatic fan control: High,

Medium, and Low

4. Inputs (returns) for cooling/heating requests

5. Inputs (returns) for electric heat

6. Inputs (returns) for damper operation requests

TB4 (left three positions) is normally used to control the system with a 0–10 Vdc input from a thermostat/controller with a variable speed output, or a fan control rheostat.

6. Low

7. V1Op/Cooling

8. Not used

9. Not used

10. V1C1 (not std)

11. V2Op/EH1St/Heating

12. V2C1/EH2St (not std)

13. Dmp Cl (not std)

requests

Adjustment and Configuration of the Engine Board

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

CAUTION

Burn Hazard!

On electric heat units, certain parameter values are locked out to prevent overheating of the unit. These functions will appear to be saved; however, they will not be accepted if the Electric Heat Protection setting is “On”. Do not change the Electric Heat Protection setting to “Off” and make changes to the protected settings unless you are programming an unconfigured service replacement board to match the unit settings on a ECM configuration label. Failure to follow this instruction could result in the unit overheating and becoming hot to the touch, which could result in minor or moderate injury, and/or equipment damage.

Note: The engine board functions and unit specific

settings are summarized on the ECM engine configuration label affixed to the back side of the control panel low voltage lid on every unit.

UV-SVN02C-EN 47

Page 48

ECM Overview and Setup

Figure 45. ECM engine label

1. Status display for instant touch-free confirmation of unit operation.

2. Configuration parameter and value display and modification changes (using integrated menu/set buttons).

3. Error code prioritized reporting.

Status Display

Figure 46. Status display

The ECM engine board contains a four-digit, sevensegment display that is used to present information in a format close to real-world language, while having a smallform factor. Most characters are immediately recognizable; however, please consult Tab l e 1 3 and

Tab l e 1 4 for the graphical representation of each

alphanumeric character.

Table 13. Screen representation of alphabetical

characters

1. To check status, configuration, or to change settings on the engine board with the power on the unit, detach the low voltage access lid and look or reach through the low voltage access panel.

2. The ECM engine label is affixed to the back or front of the low voltage access lid.

ABCDE FGHI J K LM



NOPQR S T UVWXY Z



Table 14. Screen representation of numeric characters

1234567890



Note: Characters on the ECM engine board display

appear in red, on a black background.

The display contains decimal positions as well that change position with each parameter, as appropriate. Under normal conditions (i.e., with no error code displayed), the status will loop the following message:

The ECM engine board features a nested menu integrated user interface (UI) that supports:

48 UV-SVN02C-EN

Page 49

ECM Overview and Setup

RPM Mode RUNNING/ FAN STATUS CONTINUOUS LOOP

Displayed when:

1) No error codes are present

2) Motor has completed ramping



→



→



/



/



Indicates the current rpm of Motor 1 in the system. “0” rpm here indicate that no fan speed has been requested.

Indicates the current rpm of Motor 2 in the system. “0” rpm here indicate a fan off condition OR a fan “missing” condition

Indicates the status being calculated or Fan Motor 1. If “off,” this indicates that either:

1) No fan speed is being requested or

2) The fan performance is failing to meet the request; refer to “Troubleshooting (ECM),” p. 103 for additional information.

If “on,” this indicates that the fan is performing correctly and will be used to report fan status correctly, depending on

(a)

 mode.

Indicates the status being calculated or Fan Motor 2. If “off,” this indicates that either:

1) No fan speed is being requested or

2) The fan performance is failing to meet the request; refer to “Troubleshooting (ECM),” p. 103 for additional information.

3) If the target speed for Motor 2 is “0”, this is used to indicate a missing motor

If “on,” this indicates that the fan is performing correctly and will be used to report fan status correctly, depending on

(a)

 mode.

Indicates that the temperature sensing circuit has calculated a logical “on” based on the settings of the following parameters:

///

(a)Motor 1 is the only motor for all horizontal unit ventilator sizes (075, 100, 125, 150, 200).

UV-SVN02C-EN 49

Page 50

ECM Overview and Setup

Configuration parameter and value display and modification changes

The ECM engine board’s on-board user interface is easy to use and supports:

1. Verification/auditing of on-board parameter settings (read-only)

2. Adjustment of the on-board settings (write)

Figure 47. User interface input buttons

The user interface has three input buttons, from left to right:

“M en u/ Se t”

2. “Decrement”

3. “Increment”

Each button has several different actuation levels depending on length of press, and what the UI is currently displaying.

Table 15. Button actuation levels

Button

Short Press in Status Display

Short Press in Configuration Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration Display

Button

Short Press in Status Display

Short Press in Configuration Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration Display

Button

Short Press in Status Display

Short Press in Configuration Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration Display

Duration Action

<1 sec None

Toggles between parameter name and value without saving (abandons value if changed).

>3 sec Enters the configuration menu

>3 sec If on a parameter name, toggles

to the value. If on a parameter value, saves the value settings and returns to the parameter name as confirmation.

Decrement

Duration Action

<1 sec None

<1 sec Scrolls through parameter

names, or decreases value of parameter.

>3 sec N/A

>3 sec Faster scroll through parameter

name, or faster decrease of values of parameter s.

Duration Action

<1 sec None

<1 sec Scrolls through parameter

names, or increases value of parameter.

>3 sec N/A

Faster scroll through parameter name, or faster increase of values of parameter s.

Menu/Set

Increment

50 UV-SVN02C-EN

Page 51

Configuration Use Examples

Example 1. To view the value of parameters without

saving. In this case we wish to verify that the “Low Speed Value” for Motor 1 is set correctly to 800 rpm.

We start with the ECM engine scrolling status display and proceed as follows:

Example 2. We wish to change the change the value of

Low Speed to 820 rpm:

We will continue from the previous example as shown below, using a long press to “save” the new desired value.

Note: If the display has timed out and returned to the

status loop, repeat Example 1 to arrive back at this example’s starting point.

Example 3. We wish to double check to see if the value of

“820 rpm” has been saved.

Note: If the display has timed out and returned to the

status loop, repeat Example 1 and Example 2 to arrive back at this example’s starting point.

ECM Overview and Setup

It would appear that the value has been changed, but if we check the value, we notice that the original value has been retained.

Priority / Error Display

Under special conditions, the status display will interrupt briefly to prioritize display of events:

Notes:

• During error displays, the user interface will be

disabled, until the error is removed or resolved.

• If changes are made to parameters and saved, most

settings take effect immediately. Any change to fan speeds will take effect and cause the configuration menu to exit immediately to begin tracking speeds via the on-board tachometer.

• Where practical, the unit will offer “limp-in”

performance, but to ensure safe operation, certain unit functions will be disabled. For example, if one motor fails, the unit will display an error code, but the second motor (if present) will continue to operate. However, to ensure safe operation, the electric heat (if present) will be disabled.

• If a error occurs while the configuration menu is in

effect, all unsaved values will be discarded and the error codes will be displayed.

Example 4. We wis h to change th e value of a protected

value on an electric heat unit.

UV-SVN02C-EN 51

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ECM Overview and Setup

Error Codes

Displayed during abnormal operation.

 

 

 

 



→ →



Indicates a locked rotor condition of Motor 1. The motor will be locked out until the cause has been resolved, and the power cycled; refer to refer to “Troubleshooting (ECM),” p. 103 for resolution details.

Motor 2 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor. Electric heat and changeover heat will be shut down.

Indicates a locked rotor condition of Motor 2. The motor will be locked out until the cause has been resolved, and the power cycled; refer to refer to “Troubleshooting (ECM),” p. 103 for resolution details.

Motor 1 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor. Electric heat and changeover heat will be shut down.

Indicates that Motor 1 has experienced a run-away or over speed condition, and has been shutdown. The unit will offer limited “limp-in” performance, and Motor 2 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor.

Refer to “Troubleshooting (ECM),” p. 103: to reset, the cause must be resolved and the power to the unit cycled. Electric heat and changeover heat will be shut down.

Indicates that Motor 2 has experienced a run-away or over speed condition, and has been shutdown. The unit will offer limited “limp-in” performance, and Motor 1 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor.

Refer to “Troubleshooting (ECM),” p. 103: to reset, the cause must be resolved and the power to the unit cycled. Electric heat and changeover heat will be shut down.

Indicates the motor is transitioning between speeds, ramping up or down. The message “RAMP” is briefly displayed, followed by the target speed for “Motor 1” only. Once the target speed has been reached, the status display will resume operation.

On power on, the version of software is briefly displayed, followed by the results of a POST (power on self test).

52 UV-SVN02C-EN

Page 53

Initial Setup and Configuration

After connections of power and hookup of customer installed controls/fan speed switches and under normal/ operative conditions the only adjustments needed to be made to the ECM engine board during commissioning of the unit are:

• Adjustment and calibration of the variable speed inputs (VSP/0–10V) on the system, where applicable.

• Adjustment, calibration or disabling of the optional

hangeover function on CSTI units, where

auto-c applicable.

In addition, the CSTI adapter board offers configurability

at can be used in special cases to adjust the following

th operation of the unit:

• Courtesy cooling/main valve logic inversion relays for

with normally open valves

use

• Courtesy heating/auxiliary valve logic in for use with normally open valves

• Changeover function for use with changeover coils (in

njunction with the ECM engine board)

The switches are factory-set based on the model number configuration as ordered; however, the information is provided below to aid in the understanding of the operation of the system.

version relays

ECM Overview and Setup

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage. Connections to the adapter boards/changes to the CSTI configuration switches should be made only with the power to the unit disconnected.

Configuration

Configuring the ECM Engine Controller

Adjustment and Calibration of the Variable Speed Inputs (VSP/0–10V)

WARNI NG

Hazardous Voltage w/Capacitors!

CAUTION

Burn Hazard!

NOTICE:

Equipment Damage!

You MUST follow all recommendations below. Failure to do so could result in equipment damage.

• Care should be taken in the system to use a single 24 Vac supply system to avoid damage to equipment.

• Care should be taken to observe proper polarity and grounding in the hookup of the 0–10V system to avoid damage to equipment.

UV-SVN02C-EN 53

Notes:

• The 0–10V (variable speed) inputs are available for use,

but are not mandatory. The Trane Brushless DC system comes standard with three to five field-accessible

Page 54

ECM Overview and Setup

thermostatic inputs (with adjustable speed), so the use of the 0–10V inputs is optional.

• All inputs are independently configurable and

simultaneously accessible, and the ECM engine will choose the highest user (configured and requested) speed. However, care should be taken with customer controls to avoid contention of signals.

The ECM engine and adapter boards offer standard, normalizing 0–10V Variable speed fan inputs for use with field supplied controllers or thermostats. These inputs can be used as the only input to the system, used in addition to the thermostatic (H, M, L) inputs, or not used at all. The inputs are accessible via 1TB4 on the adapter boards.

The ECM engine is factory configured to drive the unit to a minimum speed (catalogue “low speed” value), defined

 and  once the analog (0–10V) input is

as honored. As a default, the noise floor/threshold is set to 3 percent (0.3V). At 0.3V, the system will drive the motors to the speeds defined in defined as analogue input goes to 10V, the ECM engine will drive the motor to maximum speed (normally catalogue “high speed” value), defined as change speed in response.

Although the ECM engine board ships with settings that will work with most 0–10 Vdc outputs, calibration should be performed to maximize response range and controller authority. Typically, the only settings needed for the VSP inputs are calibration of the signal to ensure that the system obeys the following rules:

1. The minimum output from the field supplied controller is met with a positive fan response. That is, we do not want the higher than the minimum output of the field supplied controller, as the ECM engine will “ignore” a portion of the usable range of the customer fan variable speed output.

2. The minimum output from the field supplied controller is not significantly greater than the floor setting floor. If the minimum output of the controller is significantly greater than the floor setting, the first point that the motor will turn on will be above the

 setting on the ECM engine board to be

 and , and will

 and . If the



 and  value. The full range of motor control

will not be fully utilized in this case, as the motor will never reach the low speed motor analogue input scaling value for Motor 1 and Motor 2 (

 and

)

3. The maximum output of the controller ne or if low er, needs t o be compensated using the analog input scaling value, range. As a default, the scaling value is set to 1.00 (so a voltage of 5V will be graded as 5V); however, to compensate for long runs or lower max voltages (i.e., lower than 10.00), the scaling value can be increased accordingly to maximize operational range.

For example, if the voltage is only

9.0V at the adapter boards, then the  parameter should be set to (10/9=)

 to normalize the operational

 .. If left un-calibrated, the

eds to be 10V,

reaching a value of

unit will never attain maximum speeds, defined as

 and .

4. The ECM engine can accept sl up to 12 Vdc, and the value less than 1.0 to compensate.

 parameter can be set to a

VSP Setup Examples

Example 1:  set too high and  set too high

Example 2:

Example 3:

 set too high but  set correctly

 set correctly and  set correctly

ightly over-biased inputs

54 UV-SVN02C-EN

Page 55

ECM Overview and Setup

Use of Potentiometer/Rheostat For VSP

WARNI NG

Hazardous Voltage w/Capacitors!

WARNI NG

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage. Connections to the adapter boards/changes to the CSTI configuration switches should be made only with the power to the unit disconnected.

• Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

• All settings take effect immediately, including fan startup, enabling of electric heat. Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

A courtesy 10-Vdc supply is provided that can support a 10-mA draw. The use of a 1K or a 10K potentiometer is recommended, and only a stand-alone potentiometer (not shared with any other electrical system) should be employed. When a simple potentiometer is used as depicted in Figure 48, the zone (off).

The typical connection is depicted in Figure 48; however, please consult the unit schematic for the most updated instruction, as Figure 48 is provided as reference only.

 setting will define a null-

Figure 48. Typical connection

Adjustment or Disabling of Optional AutoChangeover Function on CSTI Units

WARNING

Hazardous Voltage w/Capacitors!

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage. Connections to the adapter boards should be made only with the power to the unit disconnected.

UV-SVN02C-EN 55

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ECM Overview and Setup

The ECM engine board provides additional temperature controlled logic to help coordinate certain electric-heat and valve logic functions:

• On units with electric heat and a changeover coil, the engine board and adapter boards are pre-configured to cause hydronic heat and electric heat to be mutually exclusive:

– On units with ComfortLink™ controls (Tracer ZN

controller

s), the Tracer ZN board will serve as the primary logic to select the electric heat only if hot water is not available, but the engine board will service as a backup lockout.

– On units with Customer Supplied Controllers (CSTI

units), the engine board and CSTI board will serve as the primary lockout.

• On CSTI units selected with a c

hangeover coil configuration, the engine board is factory configured to work in conjunction with the CSTI adapter board to provide a useful auto-changeover function. Traditionally, a fixed setpoint bi-metallic disc temperature switch is used to provide changeover with customer controls; however, the engine board has defeatable and configurable bi-metallic disc temperature switch emulation when combined with the CSTI adapter board. The ECM engine is preconfigured for typical values, so changeover settings do not necessarily need to be changed.

– An NTC thermistor is suppl

ied and affixed to the supply pipes where applicable. The ECM engine has several settings that affect the operation of the changeover function:

 parameter should normally be set to 

•

or  to use the changeover functions.

 parameter should be chosen if the unit has

•

a changeover coil without electric heat.

 parameter should be chosen if the unit

•

has a changeover coil with electric heat. Generally, this will perform the same as the



parameter but in addition, will disable heating function on electric heat and on the changeover coil if there are fan failures. The auxillary heating coil function will continue to operate and respond to the customer heating request.

 parameter should be set to  for CSTI units and

•

to  for ComfortLink controller units.

 parameter defines the temperature at which the

• engine board will close the triac onboard the ECM engine (if

 parameter defines the temperature at which the

•

 parameter is set correctly).

engine board will open the triac onboard the ECM Engine (if

 parameter is set correctly). By leaving

a “gap” between the make and break value, we will simulate hysteresis of a real bi-metallic disc temperature switch.

• When combined with the CST

I adapter board, the bimetallic disc temperature switch emulation and the electric heat lockout function will work when the switches are set correctly.

Adjustment and Configuration of the CSTI Adapter Board

CAUTION

Burn Hazard!

If SW4 is turned off, the factory/customer controller/ thermostat will be able to actuate the electric heat while hot water is available or if the fans have failed. This switch should NOT be turned off if the unit schematic indicates that it should be on, to prevent overheating of the unit (due to simultaneous electric heat and hydronic heat actuation, or failure of the fan) and to use the preferred hydronic heating over electric heat. Failure to follow this instruction could result in the unit overheating and becoming hot to the touch, which could result in minor or moderate injury, and/or equipment damage.

For CSTI units, the board mounted switches have to be set appropriately to enable the desired functionality.

Figure 49. CSTI adapter board: board-mounted

switches

Table 16. CSTI adapter board: switch functions

Switch (L-R) SW1 SW2 SW3 SW4

Function Valve one

UP position (towards terminal strip)

DOWN position (towards black relays)

operation logic

Normally Open Valve

Normally Closed Valve

Notes:

• All switches are factory-set based on customer

configuration of the unit model number. The unit will function correctly as shipped; however, the switch functions and positions are depicted for customer convenience and for service and troubleshooting aids.

• SW3 and SW4 work in conjunction with settings on the

ECM engine controller. Simple activation of changeover and electric heat lockout function may not

Val ve two operation logic

Normally Open Valve

Normally Closed Valve

Changeover Function

Changeover Function ON

Changeover Function OFF

Electric Heat / Fan Proving Function

56 UV-SVN02C-EN

Page 57

ECM Overview and Setup

work correctly unless the ECM engine board is configured to perform these functions.

• Customers are advised to locate the changeover coil

temperature sensor on the bypass line if possible, to avoid measuring standing water temperature.

• If a 4-pipe unit with changeover function is selected,

the heating input will drive the main coil if hot water is detected, but will always drive the auxiliary coil or electric heat (where available).

• Where electric heat is available with a changeover coil,

the electric heat is factory-configured to be deactivated if there is hot water available and if there is a fan failure.

The CSTI board comes with courtesy valve inversion relays that allow both normally open and normally closed two-position valves to be used with simple thermostats that do not have the configurability to adapt to the customer choice of valves. Independent switches, SW1 and SW2, are provided for 2-pipe or 4-pipe units, or 2-pipe units with an optional reheat coil. The functions of SW1 and SW2 is downstream of the changeover function (SW3 and ECM engine board). Decisions made by the changeover circuits will be flowed to the inversion circuits, if they are selected.

SW3 enables or disables the changeover function for 2-pipe changeover coil units, or 4-pipe units where the coil has both a heating/cooling circuit and a heating circuit piped internally. If SW3 is turned off, the changeover function will be disabled, and the unit will then be configured as a cooling only coil, a heating only coil, or a combination of cooling only/heating only coil. Thus, customer cooling requests will drive the main valve, and heating requests will drive the auxiliary valve.

The changeover function is designed to work with customer controllers that request heating or cooling (based on customer request), but have coil water temperatures that are “changed over” from heating to cooling (or cooling to heating) depending on the season and the building equipment available. Customer thermostats MUST be hooked to the correct terminal strip locations (V1 and V2) for the changeover function to work.

Cooling

In general, the (CSTI) changeover function will provide cooling if:

1. A unit is factory configured with a changeover coil (cooling/heating) as the only coil or as the main coil portion.

2. SW3 on the CSTI adapter board is turned on, and the

 parameter set to  or  to use the

changeover functions.

 parameter should be chosen if the unit has a

changeover coil without electric heat.

 parameter should be chosen if the unit has a

changeover coil with electric heat. Generally, this will perform the same as the will in addition, disable the heating function on

 parameter but

electric heat and on the changeover coil heat if there are fan failures. The auxiliary heating coil valve will continue to respond to customer heating requests.

3. The ECM engine has sensed that there is cold available on the supply/bypass line for the changeover coil. In this case, “cold” water is inferred by the ECM engine if:

a. A 10K NTC thermistor (similar to T

X13790374010) is wired properly to the engine board, through the crossover cables and CSTI adapter boards.

b. The input impedance of the thermistor circuit must

be set correctly (the to

 for CSTI units).

c. The temperature sensed is lower than the

parameter.

d. The

e. The temperature is not in the dead-band between

4. The customer thermostat is properly hooked up the in based on the customer cooling setpoint being lower than the space temperature.

 parameter is higher than the 

parameter.

 parameter and the  parameter (in

the this case, previous state will be retained).

put strip 1TB3, and is requesting cooling input (V1)

 parameter should be set

rane part number

water



Heating

In general, the (CSTI) changeover function will provide heating if:

1. A unit is factory-configured with a changeover coil (cooling/heating) as the only coil or as the main coil portion.

2. SW3 on the CSTI adapter board is turned on, and the

 parameter set to  or  to use the

changeover functions.

 parameter should be chosen if the unit has a

changeover coil without electric heat.

 parameter should be chosen if the unit has a

changeover coil with electric heat. Generally, this will perform the same as the will in addition, disable the heating function on electric heat and on the changeover coil heat if there are fan failures. The auxiliary heating coil valve will continue to respond to customer heating requests.

3. The ECM engine has sensed that there is hot w available on the supply/bypass line for the changeover coil. In this case, “hot” water is determined if:

a. A 10K NTC thermistor (similar to T

X13790374010) is wired properly to the engine board, through the crossover cables and CSTI adapter boards.

b. The input impedance of the thermistor circuit must

be set correctly (the

 for CSTI units).

 parameter should be set

 parameter but

ater

rane part number

UV-SVN02C-EN 57

Page 58

ECM Overview and Setup

c. The temperature sensed is higher than the 

parameter.

d. The

e. The temperature is not in the dead-band between

4. The customer thermostat is properly hooked up the input strip 1TB3, and is requesting heating input (V2) based on the customer heating set point being higher than the space temperature.

5. The heating input on 1TB3 will drive the main c always drive the auxiliary coil valve (if present). Electric heat will be locked out (where present) if hot water is available since SW4 will be factory set to “ON” in these units.

SW4 selects the electric heat loc will lock out the electric heat circuit based on either:

1. The presence of hot water in the changeover coil section (if the

2. Abnormal behavior of the fan/s (if the is set to

3. Or a combination of both the presence of hot water or ab is set to ).

4. The preceding three examp inference of the engine board that hot water is present. In this case, “hot” water is determined if:

a. The temperature sensed is higher than the

b. The

c. The temperature is not in the dead-band between

d. The input impedance of the thermistor circuit must

 parameter is higher than the 

parameter.

 parameter and the  parameter (in

the this case, previous state will be retained).

hangeover coil IF conditions 1–4 are satisfied, but will

kout function, where we

 parameter is set to ).

 parameter

).

normal behavior of the fan/s (if the  parameter

les depend on the



parameter.

 parameter is higher than the 

parameter.

 parameter and the  parameter (in

the this case, previous state will be retained).

be set correctly (the

 for CSTI units).

 parameter should be set

another unit will result in abnormal operation. The label contains four important sections:

1. How to enter the configuration menu

2. The description and meaning of the Error Codes

3. The description and meaning of the status display

4. The parameter names and values specific to that unit

Figure 50. ECM engine label

Configuring the ECM Engine Board

Every Trane Fan-Coil or Cabinet Heater unit with BLDC motors will have modules specifically configured at the factory for the operation of that unit. The ECM engine configuration label is affixed to the low-voltage access lid on the outside of the control panel (see Figure 45, p. 48 and Figure 50, p. 58). The ECM engine label may be on the back-side of the low voltage access lid, depending on the unit configuration.

The serial number of each unit and the custom configuration settings specific to that unit will be printed on the label for convenient matching of labels/settings to specific units. Programming a unit with the settings from

58 UV-SVN02C-EN

Note: This label is provided for reference only, as an

example, and should not be used to configure the unit.

Page 59

ECM Overview and Setup

Configuration Settings of the ECM Engine Board

WARNI NG

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

All settings take effect immediately, including fan startup and enabling of electric heat. Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

The adapter boards contain high voltage. Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

CAUTION

Burn Hazard!

On electric heat units, certain parameter values are locked out to prevent overheating of the unit. These functions will appear to be saved; however, they will not be accepted if the Electric Heat Protection setting is “On ”. Do not change the Electric Heat Protection setting to “Off” and make changes to the protected settings unless you are programming an unconfigured service replacement board to match the unit settings on a ECM configuration label. Failure to follow this instruction could result in the unit overheating and becoming hot to the touch, which could result in minor or moderate injury, and/or equipment damage.

3. If the format setting for rpm va not four-digit: XXXX), please check the operation mode of the ECM engine board signal output format  and .

lues are not correct (i.e.,

 and  and motor

NOTICE:

Equipment Damage!

Do not change the PWM output voltage settings as motor damage could occur.

Note: The engine board functions and unit specific

settings are summarized on the ECM engine configuration label affixed to the back side of the control panel low voltage lid, on every unit.

The following table lists the parameter names and typical settings of the ECM engine board, for reference only.

Additional Notes:

1. This list is applicable only to Fan-coil and Force-Flo products.

2. Do not change the electric heat protection settings if your unit has electric heat.

UV-SVN02C-EN 59

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ECM Overview and Setup

Table 17. Configuration settings of the ECM engine board

Typical User Interface Value Description

Sets the high-speed rpm for Motor 1. Do not exceed 1700 rpm. Sets the medium-speed rpm for Motor 1. Sets the low-speed rpm for Motor 1. Assigns an rpm to be associated with a call

for 1

stage electric heat, for Motor 1 (only

on units equipped with electric heat). Assigns an rpm to be associated with a call

for 2

stage electric heat, for Motor 1

(only on electric heat equipped units). Sets the maximum rpm for Motor 1 for the

maximum input value of the analog input. Sets the minimum turn-on rpm for

Motor 1, when the analog in put becomes active.

Sets the high-speed rpm for Motor 2. Sets the medium-speed rpm for Motor 2. Sets the low-speed rpm for Motor 2. Assigns an rpm to be associated with a call

for 1

stage electric heat, for Motor 2 (only

on electric heat equipped units). Assigns an rpm to be associated with a call

for 2

stage electric heat, for Motor 2

(only on electric heat equipped units). Sets the maximum rpm for Motor 2 for the

maximum input value of the analog input. Sets the minimum turn-on rpm for

Motor 2, when the analog in put becomes active.

Sets the operational mode for Motor 1. Must be set to  for fan-coil products. Sets the operational mode for Motor 2. Must be set to  for fan-coil products. Sets the interface type for Motor 1. Must be set to  for fan-coil products. Sets the interface type for Motor 2 Must be set to  for fan coil products. Sets the PWM frequency, for cases when

the PWM outputs are used. Sets the PWM voltage, for cases when the

PWM outputs are used. Sets the PWM voltage, for cases when the

PWM outputs are used. Sets the maximum output % that the

controller will request from Motor 1. Sets the minimum maximum output %

that the controller will request from Motor 1.

Sets the maximum output % that the controller will request from Motor 2.

Sets the minimum maximum output % that the controller will request from Motor 2.

Selects the rpm above which the Motor 1 will be assumed to be in an overspeed condition and will need to be shut down.

Description on Unit Label

Mtr 1 High Spd

Mtr 1 Med Spd

Mtr 1 Low Spd

EHStg1 Mtr1 Spd

EH Stg 2 Mtr 1 Spd

AI High Spd Mtr 1

AI Low Spd Mtr 1

Mtr 2 Hgh Spd

Mtr 2 Med Spd

Mtr 2 Low Spd

EHStg1 Mtr2 Spd

EH Stg 2 Mtr 2 Spd

AI High Spd Mtr 2

AI Low Spd Mtr 2

Op Mode Mtr 1

Op Mode Mtr 2

Mtr 1 Out Format

Mtr 2 Out Format

Mtr 1/2 PWM Freq.

Mtr 1 PWM Volt

Mtr 2 PWM Volt

Mt1 Hgh PWM Lt

Mt1 Low PWM Lt

Mt2 Hgh PWM Lt

Mt2 Low PWM Lt

Mt1 Ovspd RPM

User Interface Name

       

 

 

 

       

 

 

 

         

 

 

 

 .

 

 .

 

Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

Do not set under 450 rpm. On units with two motors, the single shafted motor is designated as Motor 1. If the unit has only one motor, all seven speed settings for the second motor (

, ,

, , , , )

should be set to zero. Analog inputs below the

rejected.

, , ,  settings

Note: are locked out on units with electric heat.

On fan-coil units, the  must not be changed.

This setting must NOT be changed, as damage to the motor may occur!

This envelope protection value should not be altered.

 setting will be

60 UV-SVN02C-EN

Page 61

Table 17. Configuration settings of the ECM engine board (continued)

ECM Overview and Setup

Description on Unit Label

Mt2 Ovspd RPM

Fan Proving Fct

AI Boost Amp

AI Floor

PulsePerRev

P Value Mtr 1

I Value Mtr 1

P Value Mtr 2

I Value Mtr 2

Ht Sens Mk Val F

Ht Sens Bk Val F

Ht Sens Resistor

Mt 1 Ramp %/sec

Mt 2 Ramp %/sec

EH Rmp Accel

Ramp MAX Time

EH Fan off delay

Lck Rtr Protect

User Interface Name

Typical User Interface Value Description

 

 

 

 .

 

 .

 .

 .

 .

 

 

 

 

 

 

 

 

 

Selects the rpm above which the Motor 2 will be assumed to be in an overspeed condition and will need to be shut down.

Selects which mode should be assigned to the Binary output circuit, depending on unit type.

Boosts or attenuates the analog input signal to compensate for long wire runs.

Rejects noise on the analog input lines and sets up the engine board to turn on if the thermostat or controller is commanding its analog outputs on.

Sets up the tachometer function to be compatible with the on-board motor and for correct speed calculation and calibration.

Sets up the on board closed loop control to control Motor 1 with proper stability.

Sets up the on board closed loop control to control Motor 2 with proper stability.

Sets the make value for the engine board triac output based on the thermistor input.

Sets the break value for the engine board triac output based on the thermistor input.

Sets the input impedance of the thermistor input.

Sets the ramp rate for Motor 1, in % per second.

Sets the ramp rate for Motor 2, in % per second

Sets the acceleration factor for the electric heat inputs.

Sets the maximum ramp time for both Motor 1 and Motor 2 (in seconds).

Selects how long the fan needs to stay on after an electric heat request has been turned off.

Selects whether to use the on-board locked rotor protection function.

Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

This envelope protection value should not be altered.

This setting has to be correct for proper unit operation of electric heat and changeo ver units.

A value of  should be used if no voltage level compensation is needed (i.e., voltage peak is at 10 Vdc).

Do not change this setting as this is critical to proper unit operation.

Do not change this setting.

Operation also depends on , , and

 settings.

Operation also depends on , , and

 settings.

Should be pre-set to “OUT” for Tracer ZN controllers.

Is used to force faster ramps when electric heat is requested.

Overrides the ramp rates  and  if the calculated ramp time exceeds

Not used on fan-coil unit.

This will shut down the affected motor, if rotational response is not detected.

.

UV-SVN02C-EN 61

Page 62

ECM Overview and Setup

Table 17. Configuration settings of the ECM engine board (continued)

Description on Unit Label

Protect Funct

Rmp dft (auto rst)

Soft Rev

User Interface Name

Typical User Interface Value Description

 

 

 .

This function protects settings on the board that affect the safety of the electric heat system.

This function shortens the ramps for faster unit commissioning and auto-resets to off after approximately 15 minutes of poweron operation.

Displays the software version.

Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

Do NOT change this setting. This setting locks out the following parameters from being changed, for safe operation of the unit.

            

To aid in commissioning of the unit, for approximately 10–15 minutes, the ramps will be shortened to quickly obse rve proper unit behavior and response to speeds.

Fan Speed Response Verification

1. After performing controller specific commissioning, observe the display on the ECM engine board with the power on, to the unit. The ECM engine display should display a looping status indicator as follows:

→→→→→ →→ →→

Notes:

• The

• A representative fan speed of “1050” rpm are shown in

2. While the unit remains on, exercise the fan controls on

62 UV-SVN02C-EN

 indicator is unit-specific and may indicate

“Off” at this point; refer to thermistor function for more information.

the following example. Each unit is factory-configured differently and will have different settings for different fan speeds.

the unit, either directly or indirectly through request for unit heat/cool. Observe the fan spinning, and then observe the fan display on the ECM engine board. It should display a looping status indicator as follows:

For any size unit (using typical unit operating fan speeds):

→→→→

→→→

→→

Note: The  indicator is unit-specific and may

indicate “Off” at this point; refer to thermistor function for more information.

TIONAL:

3. OP

While the fan is running, if practical, change the fan speeds a



Exercise all fan speeds to ensure positive unit response and to validate any field wiring.

Congratulations! Your new Trane BLDC Engine/Motor system is performing properly.

nd observe the display temporarily indicate:

Page 63

Time Clock

Setting the Time Clock

The Time Clock must be programmed for the unit to operate. If not programmed, the unit may not run in the correct occupied/unoccupied state until timing instructions are received from the Time Clock.

Note: Power must be supplied to the unit for the time

clock to be set.

The following procedure covers:

• setting the time format

• setting the current time and day

• setting the program ON / OFF settings (events)

• pre set program selections

• deleting programs

• daylight savings setting

• overriding programs (manually)

Figure 51. Time clock

1. Time format display

2. Day display

3. LED display

The time clock (see Figure 51) is located behind the access door of a Unit Ventilator.

Set the Time Format, Time, and Day

(Program to 24 hr or am/pm format.)

1. Press the Menu button until the display screen is blank (time not showing) and 24h or am/pm is blinking in the upper left corner of the screen.

2. Use the + and/or - buttons to select the desired setting and then press OK.

3. The hour display begins to blink—use the + and/or -

tons to select the desired setting and then press

but OK.

4. The minute display begins to blink—use + / - to select the desired set

5. The day display (on the left side of the display screen)

ns to blink—use + / - to select the desired setting

begi and press OK.

ting and press OK.

Set the Program

Note: The Time Clock should be used to program the unit

for the UNOCCUPIED mode—the periods of time when the unit will not be in operation. The mode you are programming is shown on the LED display:

: The Timer is in operation (ON). The unit is in

UNOCCUPIED mode.

: The Timer is not in operation (OFF). The unit

is in OCCUPIED mode.

Note: Odd number programs activate the timer ON

function (the unit is in UNOCCUPIED mode) and even number programs activate the timer OFF function (the unit is in OCCUPIED mode).

Set the Switching ON Time

Figure 52. Setting the switching ON time

Reset the Time Clock

To clear any programs that may exist from the factory, press the reset button (Res.).

Note: The time clock uses Standard Time. If you are

programming during Daylight Savings Time, one hour should be subtracted from times needed (see

For example, if the Daylight Savings Time is 2:30, the time setting for the clock should be 1:30.

UV-SVN02C-EN 63

“Daylight Savings Time,” p. 64).

1. Press OK until prog 01 is visible on the LED display (see Figure 52).

Note: When prog 01 is visible, 01 should be blinking

and the ON symbol, , should be displayed in the LED window. Press OK again.

Page 64

Time Clock

2. The hour display begins to blink—use the + and/or -

buttons to select the desired setting and then press OK.

3. The minute display begins to blink—use + / - to select

the desired

4. The day display (on the left side of the

begins to blink—use + / - to select the desired setting and press OK.

Note: Af

number should increase by one (for example, from prog 01 to prog 02). The number should be blinking and the OFF symbol, , should be displayed in the LED window. Set the switching OFF time.

setting and press OK.

display screen)

ter you set the switching ON time, the prog

Set the Switching OFF Time

1. The hour display begins to blink—use the + and/or -

buttons to select the desired setting and then press OK.

2. The minute display begins to blink—use + / - to select

the desired

3. The day display (on the left side of the

begins to blink—use + / - to select the desired setting and press OK.

Note: R

times for each additional programming needed. You can set a maximum of 20 times: 10 switching ON times, and 10 switching OFF times.

setting and press OK.

display screen)

epeat the steps for setting the switching ON/OFF

• Press the +1 the current time. Press the +1h but 1 hour from the current time.

Figure 54. Daylight Savings Time

h button (see Figure 54) to add 1 hour to

ton again to subtract

Override Program (Manual)

To override the program, press the OVR (+) button (see

Figure 55).

Toggle between the unoccupied and occupied states by pressing the OVR (+) button.

Figure 55. Manual program override

Note: When you override the program, the override

remains in effect until the next programming event or until you press OVR again.

Preset Program Selections

When selecting daily programming, preset selections can be used (see Figure 53).

Figure 53. Preset program selection options

Deleting Programs

1. Press the Menu button and then press OK until the ON

hour time display of the program you want to delete is blinking.

2. Use the + / - to select -- an

Important: S

witching programs must be deleted in

ON-OFF pairs. When you delete a single ON instruction, you must also delete the corresponding OFF instruction.

d then press OK.

Daylight Savings Time

Note: Use +1h button to make the change to and from

Daylight Savings Time.

64 UV-SVN02C-EN

Page 65

Wired Controllers—Communication Wiring

Wiring Installation (Tracer ZN520)

Tracer ZN520 controllers are LonTalk® devices that interface with the Trane Tracer Summit building management system. Reference the unit wiring diagram or submittals.

Ground shields at each Tracer ZN520, taping the opposite end of each shield to prevent any connection between the shield and anther ground. Refer to the most recent version of Trane publication CNT-SVX04A-EN (Tracer ZN520 Unit

Controller: Installation, Operation and Programming Guide) for the communication wiring diagram.

Communication wire must conform to the following specification:

1. Shielded twisted pair 18 AWG

2. Capacitance 23 (21–25) picofarads (pF) per foot

3. Listing/Rating—300 V 150C NEC 725-2 (b) Class 2 Type CL2P

4. Trane Part No. 400-20-28 or equi through Trane BAS Buying Group Accessories catalog.

Note: Co

Follow these general guidelines when installing communication wiring on units with a Tracer ZN520 controller:

• Maintain a maximum 5000 ft. aggregate run.

• Install all communication wiring in accordance with

• Solder the conductors and insulat

• Do not pass communication wiring between buildings

• Do not run power in the same conduit or wire bundle

Note: Y

mmunication link wiring is a shielded, twisted pair of wire and must comply with applicable electrical codes.

the NEC and all local codes.

sufficiently when splicing communication wire. Do not use wire nuts to make the splice.

cause the unit will assume different ground

be potentials.

communication link wiring.

with

ou do not need to observe polarity for LonTalk

communication links.

valent, available

e (tape) the joint

Wire Characteristics

Controller communication-link wiring must be low capacitance, 18-gage, shielded, twisted pair with stranded, tinned-copper conductors. For daisy chain configurations, limit the wire run length to 5,000 ft. Truck and branch configurations are significantly shorter. LonTalk wire length limitations can be extended through the use of a link repeater.

Recommended Communication Wiring Practices

The following guidelines should be followed while installing communication wire.

• LonTalk is not polarity sensitive. Trane recommends that the installe the site.

• Only strip away two inches ma conductor of shielded cable.

• Make sure that the 24 Vac power supplies are

nsistent in how they are grounded. Avoid sharing

co 24 Vac between LonTalk UCMs.

• Avoid over-tightening cable ties and other forms of

ble wraps. A tight tie or wrap could damage the

ca wires inside the cable.

• Do not run LonTalk cable alongside or in the same

nduit as 24 Vac pow e r.

• In an open plenum, avoid lighting ba those using 277 Vac.

• Do not use a trunk and branch configuration, if

ssible. Trunk and branch configurations shorten the

po distance cable can be run.

r keep polarity consistent throughout

ximum of the outer

llasts, especially

Wiring Installation (Tracer UC400)

This section provides information about wiring the UC400 controller. For more detailed information, refer to BASSVX02D-EN (Installation, Operation, and Maintenance: Tracer UC400 Programmable Controller), or the most recent revision.

Device Addressing

LonTalk devices are given a unique address by the manufacturer. This address is called a Neuron ID. Each Tracer ZN520 controller can be identified by its unique Neuron ID, which is printed on a label on the controller’s logic board. The Neuron ID is also displayed when communication is established using Tracer Summit or Rover service tool. The Neuron ID format is 00-01-64-1C-2B-00.

UV-SVN02C-EN 65

Page 66

Wired Controllers—Communication Wiring

BACnet MS/TP

Link

Power ON Check

(p. 68)

Wiring

Requirements

(p. 68)

Connection

Wiring (p. 67)

Setting the

Address (p. 66)

General

Instructions

(p. 66)

Power Supply

VAC

XFRM

BI4

AO1

AO2

1UI2

P1P

CNCNO

BO3

CNCNO

BO2

CNCNO

BO1

RELAYS

ADDRESS

TRIAC SUPPLY TRIACS

BO9BO8BO7BO6BO5BO4

TX RX

LINK

IMC

SERVI

SERVICE TOOL

CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS

BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9

x10

x100

Use a 1/8 inch (3.2 mm) flathead screwdriver to set rotary address dials. Dials rotate in either direction.

Wiring Overview Outline

General Instructions

Conformance to Regulatory Standards

All wiring must comply with the National Electrical Code™ (NEC™) and local electrical codes.

Connecting Wires to Terminals

or part of the BACnet Device ID (refer to the illustration below).

MAC Address. The MAC Address is required by the RS-

485 communication protocol on which BACnet operates. A UC400 controller can use a MAC Address from 001 to 120.

Important: Each device on the link must have a unique

MAC Address/Device ID. The controller rotary addresses should be sequentially set, with no gaps in the numbering, starting with 001 on each link (for example 001, 002, 003, 004 and so on). A duplicate address or a 0 00 address setting will interrupt communications and cause the Tracer SC device installation process to fail.

To connect wires to the UC400 controller or the expansion modules:

1. Strip the wires to expose 0.28 inch ( 7 mm) of bare wire.

2. Insert the wire into a terminal connector.

3. Tighten the terminal screw to 0.5 to 0.6 N-m 85 ozf-in or 4.4 to 5.3 lbf-in.).

4. Tug on the wires after tightening the sc all wires are secure as shown on the right.

BACnet MS/TP Link

Setting the Address

The rotary address dials on the UC400 controller serve one or two purposes depending upon the network: they are always used for the MAC Address, which is sometimes all

66 UV-SVN02C-EN

rews to ensure

(71 to

BACnet Device ID. The BACnet Device ID is required by

the BACnet network. Each device must have a unique number from 001 to 4094302.

BACnet networks without a Tracer SC system controller

On BACnet networks without a Tracer SC system controller, the Device ID can be assigned one of two ways:

• It can be the same number

as the MAC Address, determined by the rotary address dials on the UC400 controller. For example, if the rotary address dials are set to 042, both the MAC Address and the BACnet Device ID are 042.

• It can be soft set using the Tracer TU service tool. If the Cnet Device ID is set using the Tracer TU service

BA tool, the rotary address dials only affect the MAC Address, they do not affect the BACnet Device ID.

BACnet networks with a Tracer SC system controller

On BACnet networks with a Tracer SC system controller, the Device ID for the UC400 controller is always soft set by the system controller using the following scheme illustrated below.

Page 67

Wired Controllers—Communication Wiring

ADDRESS

x10

x100

001 0201

ADDRESS

x10

x100

ADDRESS

x10

x100

001 0201

ADDRESS

x10

x100

BACnet Device ID for this UC400

The first three digits are determined by the address rotary dials on the Tracer SC system controller.

The fourth digit is determined by the link number to which the UC400 controller is attached.

The last three digits are determined by the rotary address dials on the UC400 controller.

= 0012001

UC400

BI LINK IMC

+ VDC

AIAIAI AI AI

LINK IM

SERVI

SERVICE TOOL

BI LINK IMC

+ VDC

AIAIAI AI AI

TX RX

LINK IM

SERVI

SERVICE TOOL

BI LINK IMC

+ VDC

AIAIAI AI AI

TX RX

LINK IM

SERVI

SERVICE TOOL

BI LINK IMC

+ VDC

AIAIAI AI AI

TX RX

LINK IM

SERVI

SERVICE TOOL

BI LINK IMC

+ VDC

AIAIAI AI AI

TX RX

LINK IM

SERVI

SERVICE TOOL

Tracer SC

UC400

Zone sensor communications

jack wiring

Trane BACnet Terminator

Zone

Sensor

Zone

Sensor

Zone

Sensor

Note: The BACnet Device ID is displayed as the Software

Device ID on the Tracer TU Controller Settings page in the Protocol group.

Power Supply

Please read all of the warnings, cautions, and notices below before proceeding with this section.

WARNING

Hazardous Voltage!

CAUTION

Personal Injury and Equipment Damage!

After installation, make sure to check that the 24 Vac transformer is grounded through the controller. Failure to check could result in personal injury and/or damage to equipment. Measure the voltage between chassis ground and any ground terminal on the UC400 controller. Expected result: Vac £ 4.0 V

Connection Wiring

Field-supplied BACnet MS/TP link wiring must be installed in compliance with NEC and local codes. The wire must be low-capacitance, 18-gauge, stranded, tinned-copper, shielded, twisted-pair. The illustration below shows an example of BACnet link wiring with multiple UC400 controllers.

Note: For more details, refer to Wiring Guide: Unit

Controller Wiring for the Tracer SC™ System Controller (BAS-SVN03D-EN, or the most recent

revision).

Avoid Equipment Damage!

Sharing 24 Vac power between controllers could cause equipment damage.

A separate transformer is recommended for each UC400 controller. The line input to the transformer must be equipped with a circuit breaker sized to handle the maximum transformer line current.

If a single transformer is shared by multiple UC400 controllers:

• The transformer must have sufficient capacity.

• Polarity must be maintained for every UC400

troller powered by the transformer.

con

Important: If t

between two controllers powered by the same transformer, a difference of 24Vac will occur between the grounds of each controller, which can result in:

NOTICE:

he polarity is inadvertently reversed

UV-SVN02C-EN 67

• Partial or full loss of communication on the entire BACnet MS/TP link

• Improper function of the UC400

ntroller outputs

• Damage to the transfor transformer fuse

mer or a blown

Page 68

Wired Controllers—Communication Wiring

A pigtail connection may be necessary between earth ground and/or enclosure ground if the device is not grounded through one leg of the transformer wiring.

Alternate ground method.

24Vac transformer

Transformer Recommendations

A 24Vac power supply must be used for proper operation of the binary inputs, which requires 24Vac detection. In addition, the spare 24Vac outputs may be used to power relays and TRIACS.

• AC transformer requirements: UL listed, Class 2 power

transformer, 24Vac ±15%, device max load 24VA. The transformer must be sized to provide adequate power to the controller (12VA) and outputs (maximum 12VA per binary output).

• CE-compliant installations: The transf

ormer must be

CE marked and SELV compliant per IEC standards.

Wiring Requirements

To ensure proper operation of the UC400 controller, install the power supply circuit in accordance with the following guidelines:

• A dedicated power circuit disconnect switch must be ar the controller, easily accessible by the operator,

ne and marked as the disconnecting device for the controller.

• 18 AWG (0.823 mm

) copper wire is recommended for

the circuit between the transformer and the controller.

Important: The controller must

receive AC power from a dedicated power circuit; failure to comply may cause the controller to malfunction. DO NOT run AC power wires in the same wire bundle with input/output wires; failure to comply may cause the controller to malfunction due to electrical noise.

Connecting Wires

To connect the wires:

1. Disconnect power to the transformer.

2. Connect the 24Vac secondar transformer to the 24Vac and terminals on the UC400 controller (refer to the i

3. Do one of the following to ensure adequately grounded:

nnect a grounding pigtail at some point along the

• Co

secondary wire that runs between the controller terminal and the transformer.

• Ground one of the terminals on the controller to

the enclosure (if the enclosure is adequately grounded) or to an alternate earth ground.

y wires from the

llustration below).

the controller is

VAC

XFRM

AO1

BI4

ADDRESS

RELAYS

BO2

BO1

CNCNO

BI1BI2BI

AO2

1UI2

BO3

CNCNO

BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9

TRIAC SUPPLY TRIACS

ABB

CNCNO

LINK

AI3AI2AI

CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS

IMC

BO4

P1P

+ VDC

TX RX

SERVICE TOOL

LINK

IMC

SERVI

BO9BO8BO7BO6BO5

Power ON Check

To perform a Power ON check:

1. Verify that the 24Vac connector and the chassis ground are properly wired.

2. Remove the lockout/tagout from the line to the electrical cabinet.

3. Energize the transformer to

apply power to the UC400

controller.

4. Observe the UC400 controller

when power is applied

to verify the power check sequence as follows:

a. The power LED lights red for 1 second

The power LED lights green

• If the sequence above is completed as described,

the controller is properly booted and ready for the application code.

If the power LED flashes red, a fault condition exists.

voltage power

68 UV-SVN02C-EN

Page 69

Pre-Start

Pre-Start-up Checklist

Before energizing the unit, the following system devices must be checked:

Is the high voltage power supply correct and in



accordance with the nameplate ratings?

Is the field wiring and circuit protection the correct



size?

Is the low voltage control circuit wiring correct per the



unit wiring diagram?

Is the piping system clean/complete and correct?



Is unit serviceable? (See “Dimensions and Weights,”



p. 13.)

Are all the unit access panels secure and in place?



Is the water flow established and circulating through



all the units?

Is the condensate line properly sized, run, trapped and



pitched?

Does the indoor blower turn freely without rubbing?



Has all work been done in accordance with applicable



local and national codes?

Has heat transfer fluid been added in the proper mix to



prevent freezing if required?

UV-SVN02C-EN 69

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Startup

Tracer ZN520 Unit Startup

Refer to the most recent version of Trane publication CNTSVX04A-EN (Tracer ZN520 Unit Controller: Installation, Operation and Programming Guide). The factory preprograms the ZN520 with default values to control the temperature and unit airflow. Use Tracer Summit building automation system or Rover™ software to change the default values.

Follow the procedure below to operate the ZN520 in a stand-alone operation:

1. Turn power on at the disconnect switch option.

2. Position the fan mode switch to either high, medium, low, or the auto position.

3. Rotate the setpoint dial on th 55°F for cooling or 85°F for heating.

The appropriate control valve will following conditions:

1. Room temperature should be greater than 55°F and less than 85°F.

2. For a 2-pipe fan-coil unit with an autom sensor, the water temperature input is appropriate for the demand placed on the unit. For example, cooling operation is requested and cold water (5° lower than

temperature) flows into the unit.

room

3. Select the correct temperature setpoint.

Note: S

elect and enable zone sensor temperature

settings to prevent freeze damage to unit.

e zone sensor module to

actuate assuming the

atic changeover

Tracer UC400 Unit Startup

Refer to the most recent version of Trane publication BASSVX48B-EN (Installation, Operation, and Programming: Tracer UC400 Programmable Controller) for Tracer UC400 unit ventilator. The factory pre-programs the Tracer UC40 0 unit ventilator with default values to control the temperature and unit airflow. Use Tracer SC building automation system or Tracer TU software to change the default values.

Follow the procedure below to operate the Tracer UC400 in a stand-alone operation:

1. Turn power on at the disconnect switch option.

2. Position the fan mode switc low, or the auto position.

3. Rotate the setpoint dial on th 55°F for cooling or 85°F for heating.

The appropriate control valve will following conditions:

1. Room temperature should be greater than 55°F and less than 85°F.

2. For a 2-pipe fan-coil unit with an autom sensor, the water temperature input is appropriate for the demand placed on the unit. For example, cooling

70 UV-SVN02C-EN

h to either high, medium,

e zone sensor module to

actuate assuming the

atic changeover

operation is requested and cold water (5° lower than room temperature) flows into the unit.

3. Select the correct temperature setpoint.

Note: Select and enable zone sensor temperature

settings to prevent freeze damage to unit.

General Information

Manual Fan Speed Switch

The manual fan mode switch is available with a fourposition switch (off-hi-med-lo) allows manual fan mode selection and is available unit- or wall-mounted. See

Figure 56.

Figure 56. Fan speed switch

The fan speed switch can be used to provide simultaneous fan speed customer requests in addition to external controller fan speed request. The wall-mounted option is low-voltage and has three 24-volt relays using a factorywired transformer and relays to control the fan motor.

Fan Mode Switch Operation

Off

Fan is turned off, two-position damper option springreturns closed.

Hi, Med, Lo

Fan runs continuously at the selected speed. The twoposition damper option opens to an adjustable mechanical stop position.

Tracer ZN520 Operation

Off

Fan is off; control valve options and fresh air damper options close. The low air temperature detection option is still active.

Auto

Fan speed control in the auto setting allows the modulating (3-wire floating point) or 2–position control valve option and three-speed fan to work cooperatively to meet precise capacity requirement, while minimizing fan

Page 71

Startup

speed (motor/energy/acoustics ) and valve position (pump energy, chilled water reset ). As the capacity requirement increases at low fan speed, the water valve opens. When the low fan speed capacity switch point is reached, the fan switches to medium speed and the water valve repositions to maintain an equivalent capacity. The reverse sequence takes place with a decrease in required capacity.

Low/Med/High

The fan runs continuously at the selected speed and the valve option will cycle to meet setpoint.

UC400 Controller Operation

Off

Fan is off; control valve options and fresh air damper options close. The low air temperature detection option is still active.

Auto

Fan speed control in the auto setting allows the modulating (3-wire floating point) or 2-position control valve option and 1-, 2-, 3- or variable-speed fan to work cooperatively to meet precise capacity requirement, while minimizing fan speed (motor/energy/acoustics) and valve position (pump energy, chilled water reset). As the capacity requirement increases, the water valve opens. When the fan speed capacity switch points are reached, the fan speed ramps up and the water valve repositions to maintain an equivalent capacity. The reverse sequence takes place with a decrease in required capacity.

Low/Med/High

The fan runs continuously at the selected speed and the valve option will cycle to meet setpoint.

Tracer ZN520 Sequence of Operation

The Tracer ZN520 operates the fan in the following modes:

1. occupied

2. unoccupied

3. occupied standby

4. occupied bypass

5. Tracer Summit with supply fan control

Occupied (Tracer ZN520)

When the controller is in the occupied mode, the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint, based on the measured space temperature, the discharge air temperature, the active setpoint, and the proportional/ integral control algorithm. The modulating control algorithm used when occupied or in occupied standby is described in the following sections. Additional information related to the handling of the controller setpoints can be found in the previous Setpoint operation section.

Unoccupied Mode (Tracer ZN520)

When the controller is in the unoccupied mode, the controller attempts to maintain the space temperature at the stored unoccupied heating or cooling setpoint, based on the measured space temperature, the active setpoint and the control algorithm, regardless of the presence of a hard-wired or communicated setpoint. Similar to other configuration properties of the controller, the locally stored unoccupied setpoints can be modified using Rover service tool.

In unoccupied mode, a simplified zone control algorithm is run. During the cooling mode, when the space temperature is above the cool setpoint, the primary cooling capacity operates at 100 percent. If more capacity is needed, the supplementary cooling capacity turns on (or opens to 100 percent). During the heating mode, when the space temperature is below the heat setpoint, the primary heating capacity turns on. All capacity is turned off when the space temperature is between the unoccupied cooling and heating setpoints. Note that primary heating or cooling capacity is defined by unit type and whether heating or cooling is enabled or disabled. For example, if the economizer is enabled and possible, it will be the primary cooling capacity. If hydronic heating is possible, it will be the primary heating capacity.

UV-SVN02C-EN 71

Occupied Standby Mode (Tracer ZN520)

The controller can be placed into the occupied standby mode when a communicated occupancy request is combined with the local (hard-wired) occupancy binary input signal. When the communicated occupancy request is unoccupied, the occupancy binary input (if present) does not affect the controller’s occupancy. When the

Page 72

Startup

communicated occupancy request is occupied, the controller uses the local occupancy binary input to switch between the occupied and occupied standby modes.

During occupied standby mode, the controller’s economizer damper position goes to the economizer standby minimum position. The economizer standby minimum position can be changed using Rover service tool.

In the occupied standby mode, the controller uses the occupied standby cooling and heating setpoints. Because the occupied standby setpoints typically cover a wider range than the occupied setpoints, the Tracer ZN520 controller reduces the demand for heating and cooling the space. Also, the outdoor air economizer damper uses the economizer standby minimum position to reduce the heating and cooling demands.

When no occupancy request is communicated, the occupancy binary input switches the controller ’s operating mode between occupied and unoccupied. When no communicated occupancy request exists, the unit cannot switch to occupied standby mode.

Occupied Bypass Mode (Tracer ZN520)

The controller can be placed in occupied bypass mode by either communicating an occupancy request of Bypass to the controller or by using the timed override On button on the Trane zone sensor.

When the controller is in unoccupied mode, you can press the On button on the zone sensor to place the controller into occupied bypass mode for the duration of the bypass time (typically 120 minutes).

Occupancy Sources (Tracer ZN520)

There are four ways to control the controller’s occupancy:

• Communicated request (usually provided by the building automation system or peer device)

• By pressing the zone sensor’s timed override On

tton

• Occupancy binary input

• Default operation of the controller (occupied mode)

A communicated request from a building automation system controller’s occupancy. However, if communication is lost, the controller reverts to the default operating mode (occupied) after 15 minutes (configurable, specified by the “receive heartbeat time”), if no local hard-wired occupancy signal exists.

A communicated request can be provided to control the occupancy of the controller. Typically, the occupancy of the controller is determined by using time-of-day scheduling of the building automation system. The result of the time-of-day schedule can then be communicated to the unit controller.

or another peer controller can change the

Tracer Summit with Supply Fan Control (Tracer ZN520)

If the unit is communicating with Tracer Summit and the supply fan control programming point is configured for Tracer (the factory configures as local), Tracer Summit will control the fan regardless of the fan mode switch position.

When the fan mode switch is set to Off or when power is restored to the unit, all Tracer ZN520 lockouts (latching diagnostics) are manually reset. The last diagnostic to occur is retained until the unit power is disconnected. Refer to Trane publication, CNT-SVX04A-EN (Tracer ZN520

Unit Controller: Installation, Operation and Programming Guide) for specific instructions regarding the procedure

for running the Tracer ZN520.

Cooling Operation (Tracer ZN520)

The heating and cooling setpoint high and low limits are always applied to the occupied and occupied standby setpoints. During the cooling mode, the Tracer ZN520 controller attempts to maintain the space temperature at the active cooling setpoint. Based on the controller’s occupancy mode, the active cooling setpoint is one of the following:

• Occupied cooli

• Occupied standby cooling set

• Unoccupied cool

The controller uses the measured space te active cooling setpoint, and discharge air temperature along with the control algorithm to determine the requested cooling capacity of the unit (0 percent– 100 percent). The outputs are controlled based on the unit configuration and the required cooling capacity. To maintain space temperature control, the Tracer ZN520 cooling outputs (modulating hydronic valve, two-position hydronic valve, or outdoor air economizer damper) are controlled based on the cooling capacity output.

The cooling output is controlled based on the cooling capacity. At 0 percent capacity, all cooling capacities are off and the damper is at minimum position. Between 0 percent and 100 percent capacity, the cooling outputs are controlled according to modulating valve logic (modulating valves) or cycled on (2-position valves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100 percent capacity, the cooling valve or damper is fully open (modulating valves) or on continuously (and 2-position valves).

Unit diagnostics can affect fan operation, causing occupied and occupied standby fan operation to be defined as abnormal. Refer to “Troubleshooting (Wireless

Controls),” p. 94 for more information about abnormal fan

operation.

The Tracer ZN520 controller operates the supply fan continuously when the controller is in the occupied and occupied standby modes, for either heating or cooling.

ng setpoint

point

ing setpoint

mperature, the

72 UV-SVN02C-EN

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Startup

The controller only cycles the fan off with heating and cooling capacity in the unoccupied mode.

The economizer is used for cooling purposes whenever the outdoor temperature is below the economizer enable setpoint and there is a need for cooling. The economizer is used first to meet the space demand, and other forms of cooling are used if the economizer cannot meet the demand alone. See modulating outdoor air damper operation for additional information.

Cascade cooling control initiates a discharge air tempering function if the discharge air temperature falls below the discharge air temperature control low limit, all cooling capacity is at minimum, and the discharge control loop determines a need to raise the discharge air temperature. The controller then provides heating capacity to raise the discharge air temperature to its low limit.

Discharge Air Tempering (Tracer ZN520)

The discharge air tempering function enables when cold outdoor air is brought in through the outdoor air damper, causing the discharge air to fall below the discharge air temperature control low limit. The controller exits the discharge air tempering function when heat capacity has been at 0 percent for five minutes.

Heating Operation (Tracer ZN520)

During heating mode, the Tracer ZN520 controller attempts to maintain the space temperature at the active heating setpoint. Based on the occupancy mode of the controller, the active heating setpoint is one of the following:

• Occupied heating

• Occupied standb

• Unoccupied heating

During dehumidification in the heating mode, the controller adjusts setpoint. This reduces the relative humidity in the space with a minimum of energy usage.

The controller uses the measured space temperature, the active heating setpoint, and discharge air temperature, along with the control algorithm, to determine the requested heating capacity of the unit (0 percent– 100 percent). The outputs are controlled based on the unit configuration and the required heating capacity.

Unit diagnostics can affect the Tracer ZN520 controller operation, causing unit operation to be defined as abnormal. Refer to “Diagnostics,” p. 88 for more information about abnormal unit operation.

The heating output is controlled based on the heating capacity. At 0 percent capacity, the heating output is off continuously. Between 0 percent and 100 percent capacity, the heating output is controlled according to modulating valve logic (modulating valves) or cycled on (two-position valves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100 percent capacity, the heating valve is fully

y heating

the heating setpoint up to the cooling

open (modulating valves) or on continuously (twoposition valves).

The Tracer ZN520 fan output(s) normally run continuously during the occupied and occupied standby modes, but cycle between high and off speeds with heating/cooling during the unoccupied mode. When in the occupied mode or occupied standby mode and the fan speed is set at the high, medium, or low position, the fan runs continuously at the selected speed. Refer to “Diagnostics,” p. 88 for more information on abnormal fan operation.

When the unit’s supply fan is set to auto, the controller’s configuration determines the fan speed when in the occupied mode or occupied standby mode. The fan runs continuously at the configured heating fan speed or cooling fan speed. For all fan speed selections except off, the fan cycles off during unoccupied mode.

The economizer outdoor air damper is never used as a source of heating. Instead, the economizer damper (when present) is only used for ventilation; therefore, the damper is at the occupied minimum position in the occupied mode. The damper control is primarily associated with occupied fan operation.

Fan Mode Operation (Tracer ZN520)

For multiple fan speed applications, the Tracer ZN520 controller offers additional fan configuration flexibility. Separate default fan speeds for heating and cooling modes can be configured. The fan runs continuously for requested speeds (off, high, medium, or low). When the fan mode switch is in the Auto position or a hard-wired fan mode input does not exist, the fan operates at the default configured speed. See Tab l e 18 , p . 7 3 for default fan configuration for heat and cool mode. During unoccupied mode, the fan cycles between high speed and off with heating and cooling fan modes. If the requested speed is off, the fan always remains off.

Ta b l e 1 8. Fan configuration (Tracer ZN520)

Auto Fan Operation Fan Speed Default

Heating Continuous Off

Low Medium High

Cooling Continuous Off

Low Medium High

During dehumidification, when the fan is on Auto, the fan speed can switch depending on the error. Fan speed increases as the space temperature rises above the active cooling setpoint.

Additional flexibility built into the controller allows you to enable or disable the local fan switch input. The fan mode request can be either hard-wired or communicated to the controller. When both are present, the communicated request has priority over the hard-wired input. See

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Startup

Tab l e 19, Table 20, and Table 21.

Table 19. Local fan switch enabled (Tracer ZN520)

Communicated Fan Speed Input

Off Ignored Off Low Ignored Low Medium Ignored Medium High Ignored High Auto Off Low Medium High Auto Off Low Medium High Auto (configured default, determin ed by heat/cool mode)

Fan Switch (Local)

Fan Operation

Table 20. Fan operation in heating and cooling modes

(Tracer ZN520)

Heating Cooling

Fan Mode

Off Off Off Off Off Low Low Off/high Low Off/high Medium Med Off/high Med Off/high High High Off/high High Off/high Auto Default fan sp. Off/high Default fan sp. Off/high

Occ. Unocc. Occ. Unocc.

Table 21. Local fan switch disabled or not present (Tracer

ZN520)

Communicated Fan Speed Input Fan Operation

Off Off Low Low Medium Medium High High Auto (or not present) Auto (fan runs at the default speed)

Continuous Fan Operation (Tracer ZN520)

During occupied and occupied standby modes, the fan normally is on. For multiple speed fan applications, the fan normally operates at the selected or default speed (off, high, medium, or low). When fan mode is auto, the fan operates at the default fan speed.

During unoccupied mode, the controller controls the fan off. While unoccupied, the controller heats and cools to maintain the unoccupied heating and cooling setpoints. In unoccupied mode, the fan is controlled on high speed only with heating or cooling.

The unit fan is always off during occupied, occupied standby, and unoccupied modes when the unit is off due to a diagnostic or when the unit is in the off mode due to the local zone sensor module, a communicated request, or the default fan speed (off).

If both a zone sensor module and communicated request exist, the communicated request has priority.

Fan Cycling Operation (Tracer ZN520)

Tracer ZN520 does not support fan cycling in occupied mode. The fan cycles between high speed and

off in the unoccupied mode only. The controller’s cascade control algorithm requires continuous fan operation in the occupied mode.

Fan Off Delay (Tracer ZN520)

When a heating output is controlled off, the Tracer ZN520 controller automatically holds the fan on for an additional 30 seconds. This 30-second delay gives the fan time to blow off any residual heat from the heating source, such as a steam coil. When the unit is heating, the fan off delay is normally applied to control the fan; otherwise, the fan off delay does not apply.

Fan Start on High Speed (Tracer ZN520)

On a transition from off to any other fan speed, the Tracer ZN520 controller automatically starts the fan on high speed and runs the fan at high speed for 0.5 seconds. This provides the ample torque required to start all fan motors from the off position.

Entering Water Temperature Sampling Function (Tracer ZN520)

Only units using the main hydronic coil for both heating and cooling (2-pipe changeover and 4-pipe changeover units) use the entering water temperature sampling function. Two-pipe changeover and 4-pipe changeover applications allow the main coil to be used for heating and for cooling; therefore, these applications require an entering water temperature sensor.

When three-way valves are ordered with a Tracer ZN520 control, the controller is factory-configured to disable the entering water temperature sampling function, and the entering water sensor is mounted in the proper location. Disabling entering water temperature sampling eliminates unnecessary water flow through the main coil when three-way valves are used.

The controller invokes entering water temperature sampling only when the measured entering water temperature is too cool to heat or too warm to cool. Entering water is cold enough to cool when it is five degrees below the measured space temperature. Entering water is warm enough to heat when it is five degrees above the measured space temperature.

When the controller invokes the entering water temperature sampling function, the unit opens the main hydronic valve for no more than three minutes before considering the measured entering water temperature. An initial stabilization period is allowed to flush the coil. This period is equal to 30 seconds plus half of the valve stroke time. Once this temperature stabilization period has expired, the controller compares the entering water temperature against the effective space temperature

74 UV-SVN02C-EN

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Startup

(either hard-wired or communicated) to determine whether the entering water can be used for the desired heating or cooling. If the water temperature is not usable for the desired mode, the controller continues to compare the entering water temperature against the effective space temperature for a maximum of three minutes.

The controller automatically disables the entering water temperature sampling and closes the main hydronic valve when the measured entering water exceeds the high entering water temperature limit (110°F). When the entering water temperature is warmer than 110°F, the controller assumes the entering water temperature is hot because it is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high.

If the entering water temperature is unusable—too cool to heat or too warm to cool—the controller closes the hydronic valve and waits 60 minutes before initializing another sampling. If the controller determines the entering water temperature is valid for heating or cooling, it resumes normal heating/cooling control and effectively disables entering water temperature sampling until it is required.

Electric Heat Operation (Tracer ZN520)

The Tracer ZN520 controller supports one or two-stage electric heat operation for heating. To control the space temperature, electric heat is cycled to control the discharge air temperature. The rate of cycling is dependent upon the load in the space and the temperature of the incoming fresh air from the economizer (if any). Two-pipe changeover units with electric heat use the electric heat only when hot water is not available.

Manual Fresh Air Damper (Tracer ZN520)

Units with the manual fresh air damper option ship with the damper in the closed position, which is adjustable from zero to 100 percent in 25 percent increments. To adjust the position, first remove the air filter to expose the damper stop screw on the control panel end. Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage.

Economizer Damper Option (Tracer ZN520)

With a valid outdoor air temperature (either hard-wired or communicated), Tracer ZN520 uses the modulating economizer damper as the highest priority source of cooling. Economizer operation is only possible through the use of a modulating damper.

Economizing is possible during the occupied, occupied standby, unoccupied, and occupied bypass modes.

The controller initiates the economizer function if the outdoor air temperature is cold enough to be used as free cooling capacity. If the outdoor air temperature is less than the economizer enable setpoint (absolute dry bulb), the controller modulates the outdoor air damper (between the active minimum damper position and 100 percent) to control the amount of outdoor air cooling capacity. When

the outdoor air temperature rises 5°F above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position.

Table 22. Relationship between outdoor temperature

sensors and damper position (Tracer ZN520)

Outdoor Air Temp. Modulating Outdoor Air Damper

Occupied or Occupied Bypass Occupied Standby Unoccupied

None or invalid Open to

Failed Open to

Present and economizing feasible

Present & economizing not feasible

occupied minimum position

Economizing minimum postion to 100%

Open to occupied minimum position

Open to occupied standby minimum position

Economizing between occupied standby minimum position to 100%

Open to occupied standby minimum position

Closed

Open & economizing when unit is operating, closed

Closed

Dehumidification (Tracer ZN520)

Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoint.

The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.The controller uses the cooling and reheat capacities simultaneously to dehumidify the space. While dehumidifying, the discharge air temperature is controlled to maintain the space temperature at the current setpoint.

A typical scenario involves high humidity and high temperature load of the space.The controller sets the cooling capacity to 100 percent and uses the reheat capacity to warm the discharge air to maintain space temperature control. Dehumidification may be disabled via Tracer or configuration.

Note: If the unit is in the unoccupied mode, the

dehumidification routine will not operate.

Data Sharing (Tracer ZN520)

Because this controller utilizes LONWORKS® technology, the controller can send or receive data (setpoint, heat/cool mode, fan request, space temperature, etc.) to and from other controllers on the communication link, with or without the existence of a building automation system. This applies to applications where multiple unit controllers share a single space temperature sensor (for rooms with multiple units but only one zone sensor) for both standalone (with communication wiring between

UV-SVN02C-EN 75

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Startup

units) and building automation system applications. For this application you will need to use the Rover service tool. For more information on setup, refer to the Trane publication EMTX-SVX01G-EN (Rover Service Tool: Installation, Operation, and Programming Guide), or the most recent version.

Binary Inputs (Tracer ZN520)

The Tracer ZN520 controller has four available binary inputs (see Tab l e 2 3 ). Normally, these inputs are factoryconfigured for the following functions:

• Binary input 1: Low temperature detection (freezestat)

• Binary input 2: Condensate o

• Binary input 3: Occup

ancy/ Generic

• Binary input 4: Fan status

Note: Th

e generic binary input can be used with a Tracer

Summit

™

building automation system only.

Each binary input default configuration (including normally open/closed) is set at the factory. However, you can configure each of the four binary inputs as normally open or normally closed. The controller will be set properly for each factory-supplied binary input enddevice. When no device is connected to the input, configure the controller’s input as not used.

Table 23. Binary input configurations (Tracer ZN520)

Binary Input Description Configuration

BI 1

BI 2 BI 3 Occupancy Normally open Unoccupied Occupied BI 3 BI 4 Fan status

Note: The occupancy binary input is for standalone unit controllers as an

(a) During low temperature, condensate overflow, and fan status diagnos-

(b)Tab le 24 shows the controller’s response to low temperature detection, (c) The generic binary input does not affect unit operation. A building au(d)If the fan mode input is in the off position or the controller is in the un-

Low temperature detection

Condensate

(a)

overflow

Generic binary input

occupied/unoccupied input. However, when the controller receives a communicated occupied/unoccupied request, the communicated request has priority over the hard-wired input.

tics, the Tracer ZN520 control disables all normal unit operation of the fan, valves, and damper.

condensate overflow, and fan status diagnost ics. tomation system reads this input as a generic binary input. occupied mode with the f an of f, th e fan stat us i nput w il l be open. A di-

agnostic will not be generated when the controller commands the fan off. A diagnostic will only be generated if the fan status input does not close after one minute from energizing a fan output or any time the input is open for one minute. The co ntroll er wa its up to one minut e after energizing a fan output to allow the d ifferential pressure to build up across the fan.

Normally closed Normal Diagnostic

(a)

Normally closed Normal Diagnostic

Normally open Normal

(a)

N o r m a l l y o p e n N o r m a l D i a g n o s t i c

verflow

Controller Operation

Contact Closed

(c)

Contact Open

(c)

Normal

(b)

(d)

• One hydronic cooling stage

• One hydronic heating stage (deh

umidification requires

this to be in the reheat position)

• One DX cooling stage

• One or two-stage electric heat (dehumidification uires this to be in the reheat position)

req

• Face and bypass damper

• Modulating outdoor air damper

• One baseboard heat stage

For more information, see T

able 24.

Table 24. Binary output configuration (Tracer ZN520)

Binary Output Configuration

J1-1 Fan high J1-2 Fan medium J1-3 Fan low J1-4 (Key) J1-5 Cool valve—open, or 2-position valve J1-6 Cool valve—close Note 1

J1-9 J1-10 Heat valve—close or 2nd Electric heat stage

J1-11 Fresh air damper—open J1-12 Fresh air damper—close TB4-1 Generic/baseboard heat output TB4-2 24 Vac

(a) For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/

Heat valve—open, or 2 position valve, or 1st electric heat

(a)

stage

cool changeover, terminals J1-5 and J1-6 are used to control the primary valve for both heating and cooling. For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/cool changeover with electric heat, terminals J1-5 and J1-6 are used to control the primary valve (for both cooling and heating), and terminals J1-9 and J1-10 are used only for the electric heat stage. For those 2-pipe changeover units, electric heat will not be energized while the hydronic supply is hot (5° or more above the space temperature).

(a)

Binary Outputs (Tracer ZN520)

Binary outputs are configured to support the following:

• Three fan stages (when one or present, medium fan speed can be configured as exhaust fan)

76 UV-SVN02C-EN

two fan stages are

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Table 25. Analog inputs (Tracer ZN520)

DescriptionTermina

Zone TB3-1 Space temperature

Ground TB3-2 Analog ground NA Set TB3-3 Setpoint input 40°F to 115°F Fan B3-4 Fan switch input 4821 to 4919 W (off)

Ground TB3-6 Analog ground NA Analog

input 1

Analog input 2

Analog input 3

Analog input 4

G r o u n d J3 - 9 An a l o g g r o u n d N A

Notes:

1. The zone sensor, entering water temperature sensor, discharge air

2. Zone sensor: Wall-mounted sensors include a thermistor soldered to

3. Changeover units include an entering water temperature sensor.

ls Function Range

input

J3-1 Entering water

J3-2 Analog ground NA J3-3 Discharge air

J3-4 Analog ground NA J3-5 Fresh air temp/generic

J3-6 Analog ground NA J3-7 Universal input 0% to 100%

J3-8 Analog ground NA

sensor, and the outside air temperature sensor are 10KΩ thermistors. the sensor’s circuit board. Unit mounted sensors include a return air

sensor in the units return air stream.

temperature

temp

Generic 4–20mA 0% to 100% Humidity 0 to 2000 ppm CO

5°F to 122°F

2297 to 2342 W (auto) 10593 to 10807 W (low) 13177 to 13443 W

(medium) 15137 to 16463 W (high)

-40°F to 212°F

Zone Sensor (Tracer ZN520)

The Tracer ZN520 controller accepts the following zone sensor module inputs:

• Space temperature measurement (10kΩ thermistor)

• Local setpoint (either internal or ex

ternal on the zone

sensor module)

• Fan switch

• Timed override (On) and Cancel timed override

• Communication jack

Space Temperature Measurement (Tracer ZN520)

Trane zone sensors use a 10kΩ thermistor to measure the space temperature. Typically, zone sensors are wallmounted in the room and include a space temperature thermistor. As an option, the zone sensor can be unitmounted with a separate space temperature thermistor located in the unit’s return air stream. If both a hard-wired and communicated space temperature value exist, the

controller ignores the hard-wired space temperature input and uses the communicated value.

External Setpoint Adjustment (Tracer ZN520)

Zone sensors with an external setpoint adjustment (1kΩ) provide the Tracer ZN520 controller with a local setpoint (50°F to 85°F or 10°C to 29.4°C). The external setpoint is exposed on the zone sensor’s front cover.

When the hard-wired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hard-wired setpoint value, the configured setpoints, and the active mode of the controller. The hardwired setpoint is used with the controller’s occupancy mode (occupied, occupied standby, or unoccupied), the heating or cooling mode, the temperature deadband values, and the heating and cooling setpoints (high and low limits) to determine the controller’s active setpoint.

When a building automation system or other controller communicates a setpoint to the controller, the controller ignores the hard-wired setpoint input and uses the communicated value. The exception is the unoccupied mode, when the controller always uses the stored default unoccupied setpoints. After the controller completes all setpoint calculations, based on the requested setpoint, the occupancy mode, the heating and cooling mode, and other factors, the calculated setpoint is validated against the following setpoint limits:

• Heating setpoint high limit

• Heating setpoint low limit

• Cooling setpoint high limit

• Cooling setpoint low limit

These setpoint limits only apply to the occupied and

pied standby heating and cooling setpoints. These

occu setpoint limits do not apply to the unoccupied heating and cooling setpoints stored in the controller’s configuration.

When the controller is in unoccupied mode, it always uses the stored unoccupied heating and cooling setpoints.The unit can also be configured to enable or disable the local (hard-wired) setpoint. This parameter provides additional flexibility to allow you to apply communicated, hardwired, or default setpoints without making physical changes to the unit.

Similar to hard-wired setpoints, the effective setpoint value for a communicated setpoint is determined based on the stored default setpoints (which determines the occupied and occupied standby temperature deadbands) and the controller’s occupancy mode.

Fan Switch (Tracer ZN520)

The zone sensor fan switch provides the controller with an occupied (and occupied standby) fan request signal (Off, Low, Medium, High, Auto). If the fan control request is communicated to the controller, the controller ignores the hard-wired fan switch input and uses the communicated value. The zone sensor fan switch input can be enabled or disabled through configuration using the Rover service

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tool. If the zone sensor switch is disabled, the controller resorts to its stored configuration default fan speeds for heating and cooling, unless the controller receives a communicated fan input.

When the fan switch is in the off position, the controller does not control any unit capacity. The unit remains powered and all outputs drive to the closed position. Upon a loss of signal on the fan speed input, the controller reports a diagnostic and reverts to using the default fan speed.

On/Cancel Buttons (Tracer ZN520)

Momentarily pressing the on button during unoccupied mode places the controller in occupied bypass mode for 120 minutes. You can adjust the number of minutes in the unit controller configuration using Rover service tool. The controller remains in occupied bypass mode until the override time expires or until you press the Cancel button.

Communication Jack (Tracer ZN520)

Use the RJ-11 communication as the connection point from Rover service tool to the communication link—when the communication jack is wired to the communication link at the controller. By accessing the communication jack via Rover, you can access any controller on the link.

Communications (Tracer ZN520)

Tracer ZN520 controller communicates via Trane’s LonTalk protocol. Typically, a communication link is applied between unit controllers and a building automation system. Communication also is possible via Rover, Trane’s service tool. Peer-to-peer communication across controllers is possible even when a building automation system is not present. You do not need to observe polarity for LonTalk communication links.

The controller provides six 0.25-inch quick-connect terminals for the LonTalk communication link connections, as follows:

• Two terminals for communication to the board

• Two terminals for communicati the next unit (daisy chain)

• Two terminals for a connection back to the controller

Table 26. Zone sensor wiring connections (Tracer ZN520)

TB1 Description

1 Space temperature / timed override detection 2 Common 3Setpoint 4Fan mode 5 Communications 6 Communications

on from the board to

from the zone sensor

UC400 Sequence of Operation

The UC400 controller will operate to maintain the space temperature setpoint. This section provides information about sequence of operations.

Power-up Sequence (UC400)

When 24Vac power is initially applied to the UC400 controller, the following sequence occurs:

1. The Power Marquee LED turns on as red, then flashes green, and then turns a solid green.

2. All outputs are controlled OF valves and dampers close.

3. The controller reads all input local values to determine

itial values.

4. The random start timer begins (refer to the following

tion, “Random Start (UC400)”).

sec

5. The random start timer expires.

6. Normal operation begins, assuming there are no generat alarm mode, the Power Marquee LED flashes red.

Important: F

ed diagnostics. If any points are in fault or

lashing red does not indicate that the UC400 controller will fail to operate. Instead, the point(s) that are in fault or alarm mode should be checked to determine if the status of the point(s) is acceptable to allow equipment operation.

Random Start (UC400)

Random start is intended to prevent all units in a building from energizing at the same time. The random start timer delays the fan and any heating or cooling start-up from 5 to 30 seconds.

Occupancy Modes (UC400)

Occupancy modes can be controlled in the following ways:

• The state of the local (hard wired) occupancy binary put BI1.

• A timed override request from a Trane zone sensor (see

“Timed Override Control (UC400),” p. 79).

• A communicated signal from either a Tracer SC or BAS.

A communicated request, from either a Tracer SC or BAS,

es precedence over local requests. If a communicated

tak occupancy request has been established, and is no longer present, the controller reverts to the default (occupied) occupancy mode after 15 minutes (if no hard wired occupancy request exists). The UC400 controller has the following occupancy modes:

• Occupied

• Unoccupied

• Occupied standby

• Occupied bypass

F and all modulating

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Difference

Active zone temperature setpoint

Calculated discharge air temperature setpoint

Calculated unit heating/cooling capacity

Measured

zone

temperature

Measured

discharge air

temperature

Difference

Occupied Mode (UC400)

In Occupied Mode, the UC400 controller maintains the space temperature based on the occupied space temperature setpoint ± occupied offset. The controller uses the occupied mode as a default mode when other forms of occupancy request are not present and the fan runs continuously. The outdoor air damper, if present, will close when the fan is OFF. The temperature setpoints can be local (hard wired), communicated, or stored default values (configurable using the Tracer TU service tool).

Unoccupied Mode (UC400)

In unoccupied mode, the UC400 controller attempts to maintain the space temperature based on the unoccupied heating or cooling setpoint. The fan will cycle between high speed and OFF. In addition, the outdoor air damper remains closed, unless economizing. The controller always uses the stored default setpoint values (configurable using the Tracer TU service tool), regardless of the presence of a hard wired or communicated setpoint value.

Occupied Standby Mode (UC400)

The UC400 controller is placed in occupied standby mode only when a communicated occupied request is combined with an unoccupied request from occupancy binary input BI1. In occupied standby mode, the controller maintains the space temperature based on the occupied standby heating or cooling setpoints. Because the occupied standby setpoints have a typical temperature spread of 2°F (1.1°C) in either direction, and the outdoor air damper is closed, occupied standby mode reduces the demand for heating and cooling the space. The fan will run as configured (continuously) for occupied mode. The controller always uses the stored default setpoint values (configurable using the Tracer TU service tool), regardless of hard wired or communicated setpoint values. In addition, the outdoor air damper uses the economizer occupied standby minimum position setpoint to reduce the ventilation rate.

Occupied Bypass Mode (UC400)

The UC400 controller is placed in occupied bypass mode when the controller is operating in the unoccupied mode and when either the timed override ON button on the Trane zone sensor is pressed or the controller receives a communicated occupied bypass signal from a BAS. In occupied bypass mode, the controller maintains the space temperature based on the occupied heating or cooling setpoints. The fan will run as configured (continuous or cycling). The outdoor air damper closes when the fan is OFF. The controller remains in occupied bypass mode until either the CANCEL button is pressed on the Trane zone sensor or the occupied bypass time (configurable using the Tracer TU service tool) expires. The temperature setpoints can configured as local (hard wired), communicated, or stored default values using the Tracer TU service tool.

Timed Override Control (UC400)

If the UC400 controller has a timed override option (ON/CANCEL buttons), pushing the ON button initiates a timed override on request. A timed override on request changes the occupancy mode from unoccupied mode to occupied bypass mode. In occupied bypass mode, the controller controls the space temperature based on the occupied heating or cooling setpoints. The occupied bypass time, which resides in the UC400 controller and defines the duration of the override, is configurable from 0 to 240 minutes (default value of 120 minutes). When the occupied bypass time expires, the unit transitions from occupied bypass mode to unoccupied mode. Pushing the CANCEL button cancels the timed override request. In addition, it will end the timed override before the occupied bypass time has expired and transition the unit from occupied bypass mode to unoccupied mode.

If the controller is in any mode other than unoccupied mode when the ON button is pressed, the controller still starts the occupied bypass timer without changing to occupied bypass mode. If the controller is placed in unoccupied mode before the occupied bypass timer expires, the controller is placed into occupied bypass mode and remains in this mode until either the CANCEL button is pressed on the Trane zone sensor or the occupied bypass time expires.

Zone Temperature Control (UC400)

The UC400 controller has three methods of zone temperature control:

• Cascade zone control—used in the occupied,

occupied bypass, and occupied standby modes. It maintains zone temperature by controlling the discharge air temperature to control the zone temperature. The controller uses the difference between the measured zone temperature and the active zone temperature setpoint to produce a discharge air temperature setpoint. The controller compares the discharge air temperature setpoint with the discharge air temperature and calculates a unit heating/cooling capacity accordingly (refer to the illustration below). The end devices (outdoor air damper, valves, and so on) operate in sequence based on the unit heating/cooling capacity (0–100 percent).

If the discharge air temperature falls below the discharge air temperature low limit setpoint,

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(configurable using the Tracer TU service tool), and the cooling capacity is at a minimum, the available heating capacity is used to raise the discharge air temperature to the low limit (refer to the following section,

“Discharge Air Tempering (UC400).”).

• Simplified zone control— if discharge air

temperature failure occurs, then simplified zone controls runs. In the unoccupied mode, the controller maintains the zone temperature by calculating the required heating or cooling capacity (0–100%) according to the measured zone temperature and the active zone temperature setpoint. The active zone temperature setpoint is determined by the current operating modes, which include occupancy and heat/ cool modes.

scharge air temperature control— is the backup

• Di

mode that runs only if there is not valid zone temperature. In this mode, the active space temperature setpoint is used as the discharge air temperature setpoint.

Important: T

his is not a normal operating mode. The source of the invalid zone temperature needs to be corrected to restore normal operation.

Discharge Air Tempering (UC400)

If the UC400 controller is in cooling mode, cascade zone control initiates a discharge air tempering function when:

• The discharge air temperature falls below the harge air temperature low limit setpoint

disc (configurable using the Tracer TU service tool)

• All cooling capacity is at a minimum. The discharge air

tempering function allows the co heating capacity (if available) to raise the discharge air temperature to the discharge air temperature low limit setpoint.

• The cold outdoor air is brought in through the outdoor

air dam position. This causes the discharge air temperature to fall below the discharge air temperature low limit setpoint.

per and when the damper is at (high) minimum

ntroller to provide

Heating or Cooling Mode (UC400)

The heating or cooling mode can be determined in one of two ways:

• By a communicated signal from a BAS or a peer

ntroller

• Automatically, as determined by

A communicated heating signal permits the controller to

ly heat and a communicated cooling signal permits the

controller to only cool. A communicated auto signal allows the controller to automatically change from heating to cooling and vice versa.

In heating or cooling mode, the controller maintains the zone temperature based on the active heating setpoint and

the UC400 controller

the active cooling setpoint, respectively. The active heating and cooling setpoints are determined by the occupancy mode of the controller.

For 2-pipe and 4-pipe changeover units, normal heat/cool operation will not begin until the ability to conduct the desired heating or cooling operation is verified. This is done using the entering water temperature sampling function, for which a valid entering water temperature is required. When neither a hard wired nor a communicated entering water temperature value is present on changeover units, the controller operates in only heating mode and assumes the coil water is hot. The sampling function is not used.

The entering water temperature sampling function is used only for changeover applications and for information and troubleshooting. It does not affect the operation of the controller. (For more information, refer to the following section, “Entering Water Temperature Sampling Function

(UC400)”.)

Entering Water Temperature Sampling Function (UC400)

The entering water temperature sampling function is used with 2-pipe and 4-pipe changeover units and requires a valid entering water temperature value. If the entering water temperature value is less than 5°F (2.8°C) above a valid zone temperature value for hydronic heating, and greater than 5°F (2.8°C) below a valid zone temperature value for hydronic cooling, the sampling function is enabled. When the sampling function is enabled, the UC400 controller opens the main hydronic valve to allow the water temperature to stabilize. After 3 minutes, the controller again compares the entering water temperature value to the zone temperature value to determine if the desired heating or cooling function can be accomplished. If the entering water temperature value remains out of range to accomplish the desired heating/cooling function, the controller closes the main hydronic valve and waits 60 minutes to attempt another sampling. If the entering water temperature value falls within the required range, it resumes normal heating/cooling operation and disables the sampling function.

Fan Operation (UC400)

The UC400 controller supports 1-, 2-, 3-speed fans and variable-speed fans. The fan always operates continuously while either heating or cooling during occupied, occupied standby, and occupied bypass operation. During unoccupied operation, the fan cycles between OFF and HIGH, regardless of the fan configuration. When running in AUTO mode, the fan operates differently based on the mode and the type of fan.

For 1-, 2-, and 3-speed fans, each time the fan is enabled, the fan begins operation and runs on high speed for a period of time (0.5 seconds for fan coils and 3 seconds for unit ventilators and blower coils) before changing to another speed. Initially running on high speed provides

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adequate torque to start the fan motor from the OFF position.

Note: In occupied mode, the UC400 controller requires

continuous fan operation because of cascade zone control. In unoccupied mode, the fan cycles.

Manual Fan Speed Control (UC400)

Regardless of the fan type, the fan runs continuously at the desired fan speed during occupied, occupied standby, and occupied bypass operation as follows:

• When the controller receives a communicated fan

speed signal (HIGH, MEDIUM, LOW)

• The associated fan speed s

speed

• The Supply Fan Speed Request point is overridden

During unoccupied operation, the fan cycles between OFF and HIGH, signal or fan speed switch setting (unless either of these is OFF, which in turn, will control the fan OFF).

The fan turns OFF when:

• The controller receives a communicated OFF signal

• The fan speed switch is set to OFF

• Specific diagnostics are generated

• The default fan speed is set to OFF and the

operating in the AUTO mode

Note: Th

regardless of the communicated fan speed

e supply fan speed source can be configured for BAS, local, or default value control using the Tracer TU service tool.

witch is set to a specific fan

fan is

AUTO Fan Operation; 1-, 2-, 3-speed Fans (UC400)

When the controller receives a communicated auto signal (or the associated fan speed switch is set to AUTO with no communicated value present), the fan operates in the AUTO mode. In AUTO mode, the fan operates according to the fan default (configurable using the Tracer TU service tool). The fan speed has multiple speed configurations (default is AUTO ) or set to OFF for both heating and cooling operation. When configured as AUTO (and with multiple speeds available), the fan changes based on the required capacity calculated by the control algorithm.

AUTO Fan Operation; ECM Acoustical Mode (UC400)

When the controller is configured for Acoustical Mode, by means of the Fan Operating Mode Request MV point, the controller and daughter board will minimize acoustical nuisance by balancing changes in fan speed and total fan noise. The controller will fully OPEN cooling and heating valves before increasing fan speed to meet space temperature (unless the fan has been manually controlled. Refer to the preceding section, “Manual Fan Speed

Control (UC400)”). If multiple stages of electric heat exist

the controller will use a single minimum air flow for each stage.

Exhaust Control (UC400)

Exhaust control is achieved by a single-speed exhaust fan and controlled by binary output 2 (BO2). Exhaust control, if not present, can be enabled by selecting Ye s under the Exhaust Fan Selection on the Tracer TU Configuration page under the Equipment Options group.

Note: Exhaust fan configuration cannot be selected with

3-speed fan operation.

Important: If exhaust control is added to an existing

configuration, all other configuration options should be verified to match the correct equipment options.Temperature and flow setpoints will revert to default values.

The exhaust function is coordinated with the supply fan and outdoor/return air dampers as follows:

• The exhaust fan energizes when the fan when the outdoor air damper position is greater than or equal to the exhaust fan enable position (or the outside air damper position at which the exhaust fan turns ON).

• The exhaust fan turns OFF when OFF or the outdoor air damper closes to 10 percent below the exhaust fan enable position.

• If the exhaust fan/damper enable setpoint is less 10 percent, the exhaust output is outdoor air damper position is at the setpoint and deenergized at 0.

is running and

the fan either turns

than

energized if the

AUTO Fan Operation; ECM Energy Efficient Mode (UC400)

When the controller is configured for Energy Efficient Mode, by means of the Fan Operating Mode Request MV

point, the controller and daughter board will minimize energy use by running the fan at the lowest possible speed while maintaining space temperature. The controller will fully utilize valves, economizer, or electric heat which increases fan speed to meet space temperature (unless the fan has been manually controlled. Refer to the preceding section, “Manual Fan Speed Control (UC400)”).

UV-SVN02C-EN 81

Valve Operation (UC400)

The UC400 controller supports one or two modulating or two-position valves, depending on the application (refer

Table 27, p. 82). The controller opens and closes the

appropriate valve(s) to maintain the active zone temperature setpoint at the heating setpoint in heating mode or the cooling setpoint in cooling mode (refer to “Cascade Zone Control,” p. 79).

Modulating Valve Operation (UC400)

The UC400 controller supports tri-state modulating valve control. Two binary outputs control each valve: one to drive the valve open and one to drive the valve closed. The

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stroke time for each valve is configurable using the Tracer TU service tool. The controller supports the following:

•Heating

•Cooling

• Heat/cool changeover with a single valve and coil

for 2-

pipe applications

• Cooling or heat, cool changeo

ver with the main valve,

and coil

• Only heating with the auxiliary

valve and coil for 4-pipe

applications

The controller moves the modulating valve to the desired

sitions based on heating or cooling requirements.

Modulating Valve Calibration (UC400)

Modulating valve calibration is automatic. During normal controller operation, the UC400 overdrives the actuator (135 percent of the stroke time) whenever there is a request for a position of 0 percent or 100 percent. At either power-up, after a power outage, or when the occupancy status changes to unoccupied, the controller first drives all modulating valves (and dampers) to the closed position. The controller calibrates to the fully CLOSED position by over driving the actuator (135 percent of the stroke time). Thereafter, the controller resumes normal operation.

Two-position Valve Operation (UC400)

The UC400 controller supports two-position valves with a single binary output for each valve. Controllers used for 2-pipe applications support heating, cooling, or heat/cool changeover with a single valve/coil. A controller used for 4-pipe applications supports cooling or heat/cool changeover with a main valve/coil and heating only with an auxiliary valve/coil.

Modulating Outdoor/Return Air Damper (UC400)

The UC400 controller operates the modulating outdoor/ return air dampers based on the following:

• Occupancy mode

• Outdoor air temperature (communica ted or hard wired or)

sens

• Zone temperature

•Setpoint

• Discharge air temperature

• Discharge air temperature setpoint

The minimum position for an outdoor air damper is

nfigurable using the Tracer TU service tool for both

co occupied mode and occupied standby mode and for lowspeed fan operation. A controller can receive a BAScommunicated outdoor air damper minimum position.

A BAS-communicated minimum position setpoint has priority over all locally configured setpoints. When a communicated minimum position setpoint is not present, the controller uses the configured minimum position for

low fan speed whenever the fan is running at low speed, regardless of the occupancy state. Refer to Table 27 and

Table 28 for more information about how the controller

determines the position of the modulating outdoor air damper.

Table 27. Modulating outdoor air damper position

setpoint determination (UC400)

BAS-

Occupancy

Unoccupied Any value Any value 0% (closed).

•Occupied

• Occupied bypass

• Occupied standby

•Occupied

• Occupied bypass

• Occupied standby

•Occupied

• Occupied bypass Occupied standby Invalid Medium/

communicated Setpoint

Valid Any value BAS-

Invalid Low Occupied low fan

Invalid Medium/

Fan speed

high

Active Minimum Setpoint

communicated.

minimum.

Occupied minimum.

Occupied standby minimum.

Ta b l e 2 8. Relationship between outdoor temperature

sensors and damper position (UC400)

Modulating outdoor air damper position

Occupied or Outdoor Air Temperature

No or invalid outdoor air temperature.

Failed outdoor air sensor.

Outdoor air temperature present and economizing possible (Refer to section,

“Economizing (Free Cooling) (UC400),” p. 82

Outdoor air temperature present and economizing not possible (Refer to section,

“Economizing (Free Cooling) (UC400),” p. 82

Occupied

Bypass

Open to occupied

minimum

position.

Open to occupied

minimum

position.

Economizing;

damper

controlled

between occupied

minimum

position and

100%.

Open to occupied

minimum

position.

Occupied Standby Unoccupied

Open to occupied standby minimum position.

Economizing; damper controlled between occupied standby minimum position and 100%.

Open to occupied standby minimum position.

Closed.

Open and economizing during unit operation; otherwise closed.

Closed.

Economizing (Free Cooling) (UC400)

Cooling with outdoor air (during the times when the temperature is low enough to allow) is referred to as economizing (free cooling). The UC400 controller and applications with modulating outside air damper, support economizing. The modulating outdoor air damper provides the first source of cooling for the controller.

The controller initiates economizing if the outdoor air temperature is below the economizer enable point (configurable using the Tracer TU service tool). If economizing is initiated, the controller modulates the outdoor air damper (between the active minimum damper

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position and 10 0 percent) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5°F (2.8°C) above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position, based on the current occupancy mode or communicated minimum outdoor air damper position. If an outdoor air temperature value is not present, economizing is disabled.

Two-position Control Of A Modulating Outdoor Air Damper (UC400)

The UC400 controller supports two-position outdoor air damper actuators. However, a modulating outdoor/return air damper actuator can be used for two-position control. Two-position control can be achieved by not providing an outdoor air temperature (neither hard wired nor communicated) to the controller, and by setting the damper minimum position (using the Tracer TU service tool) to the desired value, typically 100 percent.

Electric Heat Operation (UC400)

The UC400 controller supports both SCR (modulating) and staged electric heat (1- or 2-stages). SCR heat is only a field-installed option. In a unit configured with staged electric heat, the electric heating circuit(s) are cycled ON and OFF appropriately to maintain the desired space temperature at the active heating setpoint. In a unit configured with SCR (modulating) electric heat, the UC400 will send a 0 to 10 Volt DC signal to adjust SCR capacity in order to maintain the desired space temperature.

In both staged and modulating electric heat applications, the simultaneous use of electric and hydronic heat is not supported and the UC400 will operate electric heat only when hot water is not available (for example, in a changeover unit). In addition, the UC400 will run the supply fan for 30 seconds after electric heat is turned OFF in order to dissipate heat from the unit

Note: This delay does not apply to steam or hydronic

heating.

Factory-configured electric heat units have built-in mechanical protections to prevent dangerously high discharge air temperatures.

Dehumidification Operation (UC400)

The UC400 controller supports space dehumidification when:

• Mechanical (DX or hydronic) cooling is available

• The heating capacity is located in the reheat position

• The space relative humidity is valid

The space relative humidity c value or come directly from a wired relative humidity sensor. The controller begins to dehumidify the space when the space humidity exceeds the humidity setpoint. The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.

an be a BAS-communicated

Peer-to-peer Communication (UC400)

Peer-to-peer communication is accomplished by means of custom TGP2 programming in the Tracer SC system controller or via hard wiring only between controllers.

Unit Protection Strategies (UC400)

The following unit protection strategies are initiated when specific conditions exist in order to protect the unit or building from damage:

•Smart reset

• Low coil temperature protection

• Condensate overflow

• Fan status

• Fan off delay

• Filter maintenance timer

• Freeze avoidance

• Freeze protection (discharge air temperature low limit)

Smart Reset (UC400)

The UC400 controller will automatically restart a unit that is locked out as a result of a Low Coil Temp Detection (BI3) diagnostic. Referred to as smart reset, this automatic restart will occur 30 minutes after the diagnostic occurs. If the unit is successfully restarted, the diagnostic is cleared. If the unit undergoes another Low Coil Temp Detection diagnostic within a 24-hour period, the unit will be locked out until it is manually reset.

Note: Freeze protection will also perform a smart reset.

Low Coil Temperature Protection (UC400)

For more information refer to BAS-SVX48B-EN

(Installation, Operation, and Programming: Tracer UC400 Programmable Controller), or the most recent revision,

and the preceding section, “Smart Reset (UC400)”.

Condensate Overflow (UC400)

For more information refer to BAS-SVX48B-EN

(Installation, Operation, and Programming: Tracer UC400 Programmable Controller), or the most recent revision.

Fan Status (UC400)

In 1-, 2- and 3-speed fans, the status is based on the statuses of the supply fan output multistate and analog points dedicated to fan control. The fan status is reported as HIGH, MEDIUM, LOW, and as a percentage, whenever the fan is running. The fan status is reported as OFF whenever the fan is not running. In addition, a fan status switch can be connected to binary input 5 (BI5) to monitor the status of the fan for belt-driven or direct-driven units (except Trane Macon factory ECM fan motor units). The fan status switch provides feedback to the controller as follows:

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• If the fan is not operating when the controller has the

fan controlled to ON, the controller generates a Low Airflow-Supply Fan Failure diagnostic.

• If the UC400 controller ener 1 minute, and the fan status switch indicates no fan

eration, the controller performs a unit shutdown

op and generates a Low Airflow-Supply Fan Failure diagnostic.

• If the fan has been operating normally for one minute, bu

t the fan status switch indicates no fan operation, the

same diagnostic is generated.

This manual diagnostic discontinues unit operation until

e diagnostic has been cleared from the controller. If a

th diagnostic reset is sent to the controller, and the fan condition still exists, the controller attempts to run the fan for 1 minute before generating another diagnostic and performing a unit shutdown. A diagnostic reset can be sent to the controller from the Tracer TU Alarms page or by temporarily overriding the Reset Diagnostic Request on the Tracer TU Binary Status page.

Note: In the ECM fan application, the ECM engine board

will monitor the status of the fan. In case of a failure, the engine board will disable the motor immediately, and the low airflow diagnostic is sent.

gizes the fan output for

Fan Off Delay (UC400)

After heating has been controlled OFF, the UC400 controller keeps the fan energized for an additional 30 seconds in order to remove residual heat from the heating source.

air temperature rises 3°F (1.7°C) above the freeze avoidance setpoint.

The following occurs when the controller is in freeze avoidance mode:

• Valves are driven open to allow w the coil

• Fan is OFF

• Economizing is disabled

• The outdoor/return air damper is closed

• DX cooling is OFF

• Electric heat stages are OF

ater to flow through

Freeze Protection (Discharge Air Temperature Low Limit) (UC400)

The UC400 controller monitors the discharge air temperature with a 10 kΩ thermistor wired to AI4. The freeze protection operation is initiated whenever the discharge air temperature falls below the discharge air temperature low limit. The discharge air temperature low limit is configurable using the Tracer TU service tool. During freeze protection, the controller increases the heating capacity or decreases the cooling capacity in order to raise the discharge air temperature above the low limit. If the discharge air temperature remains below the low limit for 3 minutes, the controller generates a Discharge Air Temp Limit diagnostic.

Freeze protection will also perform a smart reset. Refer to

“Smart Reset (UC400),” p. 83.

Filter Maintenance Timer (UC400)

The filter maintenance timer tracks the amount of time (in hours) that the fan is enabled. The Filter Runtime Hours Setpoint (configurable using the Tracer TU service tool) is used to set the amount of time until maintenance (typically, a filter change) is required. The timer can be enabled/disabled from the Supply Fan group on the Setup Parameters page in Tracer TU.

The UC400 controller compares the fan run time to filter runtime hours setpoint. Once the setpoint is reached, the controller generates a Filter Change Required diagnostic. When the diagnostic is cleared, the controller resets the filter maintenance timer to zero, and the timer begins accumulating fan run time again. The diagnostics can be cleared and the filter timer reset by temporarily overriding the Filter Timer Reset Request on the Binary Status page or by using the reset button on the Alarms page in Tracer TU.

Freeze Avoidance (UC400)

Freeze avoidance is used for low ambient temperature protection. It is initiated only when the fan is OFF. The UC400 controller enters the freeze avoidance mode when the outdoor air temperature is below the freeze avoidance setpoint (configurable using the Tracer TU service tool). The controller disables freeze avoidance when the outdoor

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Maintenance

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Service Access

To access the unit for water balancing, motor access or other start-up and maintenance functions, use one of the following methods:

1. Remove the entire front panel and put a blockoff over the air chamber in the front.

2. Remove the return air grille by releasing the mounting screws.

3. If there is no shelving or oth the end panel may allow more access.

er obstructions, removing

NOTICE:

Equipment Damage!

Do not operate unit without filters or grille in place. Operating the unit without filters or grille in place could cause equipment failure.

To replace the filter, lower the back access panel and lift the filter out of its channel and out of the unit.

Figure 57.

1. Fi l te r

2. Hinged back access panel

Periodic Maintenance

The following maintenance suggestions apply to all types of unit ventilators, chilled water, hot water, split systems and electric. Additional information for controls not supplied by The Trane Company should be obtained from the controls manufacturer.

Split system unit ventilators include a condensing unit and the instructions provided with the condensing unit will apply to the entire refrigerant system.

Filters

The air filters supplied with Trane unit ventilators are specially designed for high lint content. Depending upon room conditions, these filters will normally need to be replaced every four to eight weeks. To assure proper unit operation, inspect the filters monthly and clean or replace as required.

Overloaded filters will reduce unit air handling capacity, which may result in insufficient heating during the morning warm-up period and loss of natural cooling capacity during mild weather.

Removal of the Drain Pan

The unit ventilator’s drain pan is removable for periodic cleaning or for easy access for maintenance/drainage issues. Refer to Figure 58 and the following steps for removing the drain pan:

1. Turn off power to the unit and remove the front panel by turning camlocks.

2. Disconnect the drain line from the drain spout.

3. Remove two screws from each side of the drain pan (four total) as show

Note: The drain pan will drop straight down upon

screw removal.

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Figure 58. Removal of screws holding drain pan in

place.

Figure 59. Tie wires from the cable chase out of the

way

4. Disconnect motor wires.

5. Loosen the four bolts (two on each side of the fanboar

d; see Figure 60).

NOTICE:

Equipment Damage!

Support the fanboard before removing the bolts that support it to prevent it from falling out of the unit, which could cause equipment damage.

Note: The drain pan is installed at an angle to allow

drainage. For each end of the drain pan, remember the position (top or bottom slot) from which the fastener was removed.

4. When reinstalling, use the same steps in reverse order, remembering the pitch of the drain pan.

Figure 60. Loosen the two bolts (four total) at either

end of the fanboard

Removal of the Fanboard and Coil Cleaning

The unit ventilator fan board can be removed for service to the blower motor and fan wheels. The fan board must also be removed for easier access to the unit coils for cleaning and maintenance. Utilize the following steps for proper removal of the fanboard.

1. Turn off power to the unit and remove the front panel.

2. Remove the front air grille and filter

3. Pick wires out of the cable c way (see Figure 59).

Note: The cable c

assembly.

hase is part of the fanboard

hase and tie them out of the

from the unit.

6. For units with face and bypass options only: Before removing the fanboard, the drain pan must be removed (Figure 58, p. 86). After the drain pan has been removed, proceed to Step 7.

7. Remove the bolts and fanboard.

8. When reinstalling, use the same steps in

reverse order.

Lubrication: Fan Shaft

One fan shaft bearing is mounted on the right end of the fan board. This sleeve-type bearing has an inner surface of sintered bronze which allows oil to flow from the built-in

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Maintenance

reservoir to the bearing surface without the use of grooves or holes in the inner bearing surface. Do not alter the inner bearing in any way.

Fill the bearing reservoir every six months with a No. 10 SAE, non- detergent, automotive type oil.

Motor

The fan motor is an electronically commutated motor.

To replace the fan motor, complete the following steps:

1. Turn off power to the unit and remove the front cover.

2. Complete steps for return air grille and filter removal.

3. Complete steps for removal of drain pan if face and ypass option is installed.

4. Complete steps for removal of fan board.

5. Disconnect the motor ground wire.

6. Using a 7/16-in. Allen wrenc

the fan shaft.

7. Loosen the screw on the motor clamp until it allow the

motor to be lifted off the base.

8. Lift the motor and pull forward until fan shaft separates

from the motor.

9. Attach new motor to fan shaft and reverse steps to

complete installation.

h, loosen the coupling on

Preventive Maintenance

A comprehensive preventive maintenance program should be established for a unit ventilator system. The following are several key elements:

• Inspect the filters monthly.

• Inspect and clean the drain pans every three months.

• Check the coils for “dirt” accum six months.

• Clean the coils at least once each year.

• Inspect the unit ventilator insulation every three

onths; thoroughly clean as needed.

ulation every three to

Modulating Valves (3-Wire Floating)

The valve should be services by a trained, experienced technician. For detailed installation and removal steps, refer to “Modulating Water Valves (Option),” p. 24 in this manual.

For general servicing or malfunction, follow one of the appropriate steps:

1. If the valve is leaking, drain system OR isolate valve from the system. DO NOT remove valve body from plumbing.

2. Check to see if the cartridge ne follow appropriate steps explained for cartridge assembly removal.

3. If the motor or other interna damaged, replace the entire actuator assembly.

Notes:

• These h

silent operation. However, water noise may occur as a result of high water velocity. Piping noises may also occur in high temperature (over 212°F) systems with insufficient water pressure.

• Do not use petroleum-based or mineral oil type boiler additives. Compounds with a 50-percent water dilution that can be used are diethylene glycol, etheylene glycol and propylene glycol.

ydronic valves are designed and tested for

eds to be replaced. If so,

l parts of the actuator is

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Troubleshooting Checklist

If operating difficulties are encountered, refer to the following table for probable causes and corrective measures. If suggested corrective measures have been

WARNI NG

Hazardous Service Procedures!

taken, and the trouble still persists, contact the control supplier or the local Trane Sales Office.

The maintenance and trouble shooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components per these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Problem Heating Cooling Cause Correction

Room too warm (outside air temperature is below 35°F)

Room too warm (outside air temperature is above 35°F)

Unit utilizes Wall Fin auxiliary radiation:

XMain power off. Check fuses. X Room sensor is not properly set. Reset room sensor temperature. X Room sensor is providing a false reading due

to walls being cold from the night temperature setting.

X Sensor is mounted on a block wall that is

leaking cold air into the room through the mounting holes.

X Face and bypass damper, or coil valve is

malfunctioning.

X Room sensor is not properly set. Reset room sensor temperature. X Face and bypass damper o r coil control valve

is malfunctioning.

X OA damper is in the closed position. Ensure OA damper is in the open position. X Clogged filter. Replace filter. X Control valve is malfunctioning. Check flow of hot water through the control

X Boiler . Check the boiler reset schedule to determine

X Steam. Check the operation of the control valves. X Outside air temperature is above 60°F to

65°F.

Start the warm-up cycle earlier in the morning to provide appropriate time-frame to increase room temperature prior to space occupation.

Relocate sensor.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

valve.

if the loop temperature can be decreased.

The economics of the unit ventilator selection dictate that, in most cases, the unit will be sized to provide adequate natural (ventilation) cooling without outside temperatures up to 60°F to 65°F. Above this point, a changeover should be made to the mechanical cooling cycle.

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Problem Heating Cooling Cause Correction

Room too cool X Room sensor is not properly set. Reset room sensor temperature.

X Clogged filter. Replace filter. X Face and bypass damper, or coil valve is

malfunctioning.

X OA damper is in the open position. Ensure OA damper is in the closed or

X Boiler pressure or temperature design

requirements not being met.

Room too cool

X Radiation controls malfunctioning. Check the operation of the wall fin controls.

Unit utilizes Wall Fin auxiliary radiation:

Room too hot X Room sensor is not properly set. Reset room sensor temperature.

X Clogged filter. Replace filter. X Face and bypass damper, or coil valve is

malfunctioning.

X OA damper is in the open position. Ensure OA damper is in the minimum o utside

X Chiller temperature design requirements not

being met.

Motor X If the motor fails to start, and other motors

on the same circuit are functioning.

X If the motor fails to start, and other motors

on the same circuit are functioning.

Unit

X X If the unit fails to start. Check fuse in right-hand end pocket inside the

265 and 460 volt unit

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

minimum outside air position. On hot water and steam type units, check the

boiler pressure or temperature to ensure that the requirements are being met.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

air position. Check the temperature of the water leaving

the chiller to ensure that it meets design requirements.

Check the unit switch to ensure it is in the ON position.

Check for loose switch or motor connection.

transformer mounting box. Replace with Trane fuse X1311057435 (ABC type 6A 250V).

Output Testing and Diagnostics (Tracer ZN520)

Table 29. Tracer ZN520 diagnostics

Diagnostic Fan Other Outputs

Condensate overflow

Low temperature detection

Low air flow - fan failure

Space temperature failure

Entering water temp failure

Discharge air temp low limit

Discharge air temp failure

Fresh air temp failure

Relative humidity failure

Generic 4–20mA failure

Off Valves Closed, Fresh air damper Closed, Electric

heat Off, Baseboard heat Off

Off Valves Open, Fresh air damper Closed, Electric heat

Off, Baseboard heat Off

Off Valves Closed, Fresh air damper Closed, Electric

heat Off, Baseboard heat Off

Off Valves Closed, Fresh air damper Closed, Electric

heat Off, Baseboard heat Off

On Valves Enabled

Electric heat Enabled

Off Valves Open, Fresh air damper Closed, Electric heat

Off, Baseboard heat Off

Off Valves Closed, Fresh air damper Closed, Electric

heat Off, Baseboard heat Off

On Valves Enabled, Fresh air damper Minimum

position Enabled

On Valves Enabled, Fresh air damper Enabled, Electric

heat Enabled, Baseboard heat Enabled

On Valves Enabled, Fresh air damper Enabled, Electric

heat Enabled, Baseboard heat Enabled

(a)

(b)

, Fresh air damper Enabled

(b)

, Baseboard heat Off

(c)

, Electric heat Enabled, Baseboard heat

Table 29. Tracer ZN520 diagnostics

Diagnostic Fan Other Outputs

CO2 Input failure On Valves Enabled, Fresh air damper Enabled, Electric

Maintenance required

Local fan mode failure

Local setpoint failure

Invalid unit configuration

Normal—power upOn Valves Enabled, Fresh air damper Enabled, Electric

(a) The generic binary output (TB4-1, TB4-2) state is unaffected by all unit

diagnostics.

(b)

(b)When the entering water temperature is required but not pres ent, the

Tracer ZN520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically cl ears the diagnostic once a valid entering water temperature value is present (non-latching diagnostic). When the ente ri ng w ate r t em p eratu r e se n so r f ails, the controller prohibits all hydronic cooling operation, but allows the delivery of heat when heating is required. In the Cool mode , all cooling is lockedout, but normal fan and outdoor air damper operation is permitted.

the Tracer ZN520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present (non-latc hing diagnostic). When the outdoor air temperature sensor fails or is not present, the controller prohibits economizer operation.

heat Enabled, Baseboard heat Enabled

On Valves Enabled, Fresh air damper Enabled, Electric

heat Enabled, Baseboard heat Enabled

On Valves Enabled, Fresh air damper Enabled, Electric

heat Enabled, Baseboard heat Enabled

On Valves Enabled, Fresh air damper Enabled, Electric

heat Enabled, Baseboard heat Enabled

Off Valves Disabled, Fresh air damper Disabled,

Electric heat Disabled, Baseboard heat Disabled

heat Enabled

(a)

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Translating Multiple Diagnostics (Tracer ZN520)

The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they occur.

Possible diagnostics include:

• Low temperature detection

• Condensate overflow

• Low air flow—fan status

• Discharge air temp limit

• Space temperature failure

• Entering water temp failure

• Discharge air temp failure

• Outdoor air temp failure

• Local setpoint failure

• Local fan mode failure

•CO2 sensor failure

• Generic AIP failure

• Humidity input failure

• Defrosting compressor lockout

• Maintenance required

• Invalid unit configuration

• Generic temperature failure

• Discharge air low limit

Resetting Diagnostics (Tracer ZN520)

There are a number of ways in which diagnostics are reset:

1. Automatic reset by the controller

2. By initiating a manual output test at the controller

3. By cycling power to the controller

4. Through Rover, Trane’s service tool

5. Tracer ZN520: by using any other communicating

e ab le to access the controller’s diagnostic reset

devic input.

6. Tracer ZN520: by cycling the fan switch from Off to any speed set

ting.

Automatic Reset by the Controller (Tracer ZN520)

The controller includes an automatic diagnostic reset function that attempts to automatically restore the unit when a low temperature diagnostic occurs.

Note: The controller implements the automatic

diagnostic reset function only once every 24 hours. For the controller to increment the 24 hour timer, you must maintain power to the controller. Cycling power resets all timers and counters.

After the controller detects the first special diagnostic, the unit waits 30 minutes before invoking the automatic diagnostic reset function. The automatic diagnostic reset

function clears the special diagnostic and attempts to restore the controller to normal operation. The controller resumes normal operation until another diagnostic occurs.

Note: The automatic diagnostic reset function does not

operate during the manual output test sequence.

If a special diagnostic occurs within 24 hours after an automatic diagnostic reset, the controller must be manually reset. Other possible methods of resetting diagnostics are described in the sections that follow.

Manual Output Test (Tracer ZN520)

To verify proper end device operation, press the controller’s Test button. This exercise will verify all outputs in a predefined sequence, the first of which will attempt to reset the controller diagnostics if any are present.

Cycling Power to the Controller (Tracer ZN520)

After removing and reapplying the 24 Vac power from the board, the unit cycles through a power-up sequence. By default, the controller attempts to reset all diagnostics present at power-up. Diagnostics present at power-up and those that occur after power-up are handled according to

Table 30.

Table 30. Tracer ZN520 controller diagnostics

Diagnostic Latching Fan Valves

Auxiliary temp. failure

Condensate overflow detection

Entering water temp. failure

Fan mode failure No Enabled Enabled Enabled Enabled Invalid unit

configuration failure Low temp. detection Yes Off Open Off Closed Maintenance

required Setpoint No Enabled Zone temp. failure No Off Closed Off Closed

Notes:

1. Priority Level: Diagnostics are listed in order from highest to lowest priority. The controller senses and records each diagnostic independently of other dia gnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics affect unit operation according to priority level.

2. Latching: A latching diagnostic requires a manual reset of the controller; while a non-latching diagnostic automatically resets when the input is present and valid.

3. Enabled: End device is allowed to run if there is a call for it to run.

4. Disabled: End device is not allowed to run even if there is a call for it

to run.

5. No Action: The diagnostic has no affect on the end device.

No Enabled

Yes Off Closed Off Closed

No Enabled Enabled Enabled Enabled

Yes Disabled Disabled Disabled Disabled

Yes Enabled

No action

Elec Heat Damper

No action No action

Non-latching diagnostics automatically reset when the input is present and valid.

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Using Trane’s Service Tool, Rover (Tracer ZN520)

Rover, Trane’s service tool, can reset diagnostics present in the controller and troubleshoot the unit. For more information, refer to the Trane publication EMTX-SVX01G-EN (Rover Service Tool: Installation, Operation, and Programming Guide), or the most recent revision.

Diagnostic Reset (Tracer ZN520)

Any device that can communicate the network variable nviRequest (enumeration “clear_alarm”) can reset diagnostics in the Tracer ZN520 controller.The controller also attempts to reset diagnostics whenever power is cycled.

Cycling the Fan Switch (Tracer ZN520)

Cycle the fan speed switch from Off to any speed and the controller resets all diagnostics. Diagnostics may recur immediately if the problem still exists.

Table 31. Fan outputs do not energize (Tracer ZN520)

Probable Cause Explanation

Random start After power-up, the controller always observes a random

Power-up control wait

Cycling fan operation

Unoccupied operation

Fan mode off When using the local fan mode switch to determine the fan

Requested mode: off

Diagnostic present

No power to the controller

Manual output test

Unit wiring The wiring between the controller ou tputs and the fan relays

start that varies observed between 0 and 25 seconds. The controller remains off until the random start time expires.

When power-up control wait is enabled (non- zero time), the controller remains off until one of two conditions occurs:

1. The controller exits power -up control wait once it receives communicated information.

2. The controller exits power-up control wait once the power-up control wait time expires.

When the fan mode switch is in the auto position, the unit fan cycles off when there i s no call for heating or cooling. The heating/cooling sources cycle on or off periodically with the unit fan to match the capacity according to pulse-widthmodulation (PWM) logic.

The fan cycles with capacity when the unit is in unoccupied mode. This occurs even if the unit is in continuous fan operation. While unoccupied, the fan cycles on or off with heating/cooling to provide varying amounts of heating or cooling to the space to match the to pulse-width-modulation (PWM) logic.

operation, the off position controls the unit fan to off. It is possible to communicate the operating mode (such as

off, heat, and cool) to the controller. When “off” is communicated to the controller , the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

A specific list of diagnostics effects fan operation. For more information, see “Diagnostics,” p. 88.

If the controller does not have power, the unit fan will not operate. For the controller to operate normally , it must have an input voltage of 24 Vac. When the green LED is off continuously, the controller does not ha v e suf ficie nt powe r or the controller has failed.

The controller includes a manual output test sequence to verify binary output operation and the associated wiring. However , based on the curren t step in the test sequence, the unit fan may not be powered on. Refer to “Manual Output

Test (Tracer ZN520),” p. 90.

and contacts must be present and correct for normal fan operation. Refer to the typical unit wiring diagrams.

Table 32. Valves stay closed (Tracer ZN520)

Probable Cause Explanation

Normal operation

Requested mode: off

Valve override The controller can communicate a valve override request.

Manual output test

Diagnostic present

Sampling logic

Unit configuration

No power to the controller

Unit wiring The wiring between the controller outputs and the valve(s)

The controller opens and closes the valves to meet the unit

capacity requirements.

It is possible to communicate the operating mode (such as off, heat, and cool) to the controller. When off is communicated to the controller, the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

This request affects the valve operation. The controller includes a manual outp ut test sequence to

verify analog and binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may not be open. Refer to “Manual

Output Test (Tracer ZN520),” p. 90.

A specific list of diagnostics affects valve operation. For more information, see “Diagnostics,” p. 88.

The controller includes entering wate r temperature sampling logic that automatically invokes during 2-pipe or 4-pipe changeover. It determines when the enterin g w at er temperature is either too cool or too hot for the desired heating or cooling mode.

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the valves may not work correctly.

If the controller does not have power, the valves do not operate. For the contr oller to operate normally , it must ha ve an input voltage of 24 Vac. When the green LED is off continuously, the controller does not have sufficient power, or the controller has failed.

must be present and correct for normal valve operation. Refer to the typical unit wiring diagrams.

Table 33. Valves stay open (Tracer ZN520)

Probable Cause Explanation

Normal operation

Valve override

Manual output test

Diagnostic present

Sampling logic

Unit configuration

Unit wiring

The controller opens and closes the valves to meet the unit capacity requirements.

The controller can communi cate a valve over ride request to affect the valve operation.

The controller includes a manual output test sequence that verifies analog and binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may be open. Refer to “Manual

Output Test (Tracer ZN520),” p. 90.

A specific list of diagnostics affects valve operation. For more information, see “Diagnostics,” p. 88.

The controller includes entering wate r temperature sampling logic that automatically invokes during 2-pipe or 4-pipe changeover to determine if the entering water temperature is correct for the unit operating mode.

The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation. Refer to the typical unit wiring diagrams.

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Table 34. Electric heat not operating (Tracer ZN520)

Probable Cause Explanation

Normal operation

Requested mode: off

Communicated disable

Manual output test

Diagnostic present

Unit configuration

No power to the controller

Unit wiring The wiring between the contr oller outputs and the electric

ECM Motor / Control Board Failure

Hot water is present on a changeover unit

The controller cycles electric heat on and off to meet the unit capacity requirements.

It is possible to communicate the operating mode (such as off, heat, co ol) to the controller. When off is communicated to the controller, the units shuts off the electric heat.

Numerous communicated requests may disable electric heat, including an auxiliary heat enable input and the heat/ cool mode input. Depending on the state of the communicated request, the unit may disable electric heat.

The controller includes a manual o utput test sequence that verifies analog and binary output operation and associated output wiring. However, based on the current step in the test sequence, the electric heat may not be on. Refer to

“Manual Output Test (Tracer ZN520),” p. 90.

A specific list of diagnostics affects electric heat operation. For more information, see “Diagnostics,” p. 88.

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the electric heat may not work properly.

If the controller does not have power , electric heat does not operate. For the controller to operate normally, a 24 Vac input voltage must be applied. When the green LED is off continuously, the controller does not have sufficient power or has failed.

heat contacts must be present and correct for normal electric heat operation. Refer to the typical unit wiring diagrams.

ECM controls include sophisticated fan pro ving / interlock circuitry that will disable elect ric heat if one or more motors are not performing normally

On units with changeover coil and electric heat, simultaneous operation of hydronic heat and electric heat is not allowed.

Table 36. Fresh air damper stays closed (Tracer ZN520)

Probable Cause Explanation

Normal operation

Warmup and cooldown

Requested mode: off

Manual output test

Diagnostic present

Unit configuration

No power to the controller

Unit wiring The wiring between the controller outputs and the fresh air

The controller opens and closes the fresh air damper based on the controller’s occupancy mode and fan status. Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

The controller includes both a warmup and cooldown sequence to keep the fresh air damper closed d uring the transition from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possi ble.

It is possible to communicate the operating mode (such as off, heat, cool ) to the con troller. When off is communicated to the controller, the unit closes the fresh air damper.

The controller includes a manual output test sequence that verifies analog and binary output operation and associated output wiring. However, based on the current step in the test sequence, the fresh air damper may not be open. Refer to

“Manual Output Test (Tracer ZN520),” p. 90.

A specific list of diagnostics effects fresh air damper operation. For more information, see “Diagnostics,” p. 88.

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the damper may not work correctly.

If the controller does no t hav e pow er, the fresh air damper does not operate. For th e co nt r oll er to ope rate normally, a 24 Vac input voltage must be applied. When the gre en LED is off continuously, the controller does not have sufficient power or has failed.

damper must be present and correct for normal damper operation. Refer to the typical unit wiring diagrams.

Table 35. Fresh air damper stays open (Tracer ZN520)

Probable Cause Explanation

Normal operation

Manual output test

Unit configuration

Unit wiring The wiring between the controller outputs and the fresh air

The controller opens and closes the fresh air dampe r based on the controller’s occupancy mode and fan status. Normally, the fresh air damper is open during occupied mode when the fan is running and cl osed during unoccupied mod e.

The controller includes a manual output test sequence that verifies analog and binary output operation and associated output wiring. However, based on the current step in the test sequence, the fresh air damper may not be open. Refer to

“Manual Output Test (Tracer ZN520),” p. 90.

damper must be present and correct for normal damper operation. Refer to the typical unit wiring diagrams.

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Output Testing and Diagnostics (UC400)

This section provides information about the following:

• Output testing

• Diagnostics

Note: For detailed description of LED activities and

troubleshooting tips, refer to the section.

Output Testing (UC400)

Important: Do not directly overwrite the outputs.

Output testing can be accomplished by overriding the following analog and multistate value points in the desired state or position:

• Cool valve request

• DX cool request

• Economizer request

• Electric heat request

• Heat valve request

• Supply fan speed request

The points can be overridden on the Tracer TU analog or

ltistate pages by clicking on the Override icon in

mu the control column. A higher priority (lower number) must be chosen over the current control setting.

Diagnostics (UC400)

shut down. Manual diagnostics can be cleared from the UC400 controller in one of the following ways:

• By using the Tracer TU service tool to reset

latching

diagnostics on the Alarms Status tab or by temporarily overriding the Reset Diagnostic Request (bv/2) on the Binary Status tab.

• Through a building automation system.

• By cycling power to the cont

roller. When the 24Vac

power to the controller is cycled OFF and then ON again, a power-up sequence occurs.

Automatic (Non-latching) Diagnostics (UC400).

Automatic diagnostics clear automatically when the problem that generated the diagnostic is solved.

Smart Reset Diagnostics (UC400). Smart Reset

Diagnostics are latching diagnostics that will auto-recover if the condition is corrected. After the controller detects the first smart reset diagnostic, the unit waits 30 minutes before initiating the smart reset function. If another diagnostic of this type occurs again within 24 hours after an automatic clearing, clear the diagnostic manually by using any of the ways listed under the preceding section,

“Manual (Latching) Diagnostics (UC400).”

Informational Diagnostics (UC400). Informational

diagnostics provide information about the status of the controller. They do not affect machine operation, but can be cleared from the controller using the BAS or Tracer SC.

Diagnostics are informational messages that indicate the operational status of the UC400 controller. In response to most diagnostics, the controller attempts to protect the equipment by enabling/disabling, or by opening/closing specific outputs. Other diagnostics provide information about the status of the controller, but have no effect on outputs. Diagnostics are reported in the order in which they occur. Multiple diagnostics can be present simultaneously. Diagnostic messages are viewed using the Tracer TU service tool or through a BAS.

Note: Tracer TU will report only active diagnostics.

Diagnostics Types (UC400)

Diagnostics are categorized according to the type of clearing method each uses and the type of information each provides.

The diagnostic types are:

• Manual (latching) diagnostics

• Automatic (non-latching) diagnostics

• Smart reset diagnostics

• Informational diagnostics

Note: Cle

aring diagnostics refers to deleting diagnostics from the software; it does not affect the problem that generated the message.

Table of Diagnostics (UC400)

Table 37 lists each diagnostic that can be generated by the

UC400 controller, the diagnostic effect on outputs (consequences), and diagnostic type.

Note: The generic binary output is unaffected by

Table 37. UC4000 diagnostics

diagnostics.

Diagnostic Probable Cause Consequences

Filter change required

Condensate overflow

Low coil temp detection

Low airflow supply fan failure

Fan run hours exceed the time set to indicate filter change.

The drain pan is full of water.

The leaving fluid temperature may be close to freezing.

The fan drive belt, contactor, or motor has failed.

•Fan Unaffected

•Valves Unaffected

•Electric heat

Unaffected

•Fan OFF

•Valves Closed

• Outdoor air damper

Closed

•DX/electric heat OFF

•Fan OFF

•Valves Open

• Outdoor air damper

Closed

•DX/electric heat OFF

•Fan OFF

•Valves Closed

• Outdoor air damper

Closed

•DX/electric heat OFF

Diagnostic Type

Informational

Manual

Smart reset/ Manual

Manual

Manual (Latching) Diagnostics (UC400). Manual

diagnostics (also referred to as latching) cause the unit to

UV-SVN02C-EN 93

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Diagnostics

LED1

LED2 LED3

LED5

Table 37. UC4000 diagnostics (continued)

Diagnostic Probable Cause Consequences

Space temperature failure

Entering water temp failure

Discharge air temp low limit

Discharge air temp failure

Outdoor air temp failure

Humidity input failure

sensor

failure

Generic AIP failure

Local fan mode failure

Local setpoint failure

(a)For detailed information about zone temperature control methods, refer

to “Zone Temperature Control (UC400),” p. 79.

Invalid or missing value for zone

(a)

temperature.

Invalid or missing value for zone temperature.

Discharge air temperature has fallen below the Discharge Air Temperature Low Limit.

Invalid or missing value for discharge

(a)

air temperature.

Invalid or missing value for outdoor air temperature.

Invalid or missing value for relative humidity.

Invalid or missing value for CO

Invalid or missing value for generic analog input.

Invalid or missing fan-speed switch

(reverts to default fan speed).

Invalid or missing value for zone temperature setpoint (reverts to default setpoint).

• Discharge air temperature control runs

•Unit shuts OFF if both space temperature and discharge air temperature fail

•Fan Unaffected (enabled)

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX/electric heat

Unaffected

•Fan OFF

•Valves Open

• Outdoor air damper

Closed

• DX/electric heat OFF

• Simplified zone control algorithm runs

• Unit shuts OFF if zone temperature fails

•Fan Unaffected

•Valved Unaffected

• Outdoor air damper

Minimum Position

• DX cooling/electric heat unaffected

•Fan Unaffected

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

•Fan Unaffected

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

•Fan Unaffected

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

•Fan Unaffected

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

•Fan Unaffected

•Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

Diagnostic Type

Automatic

Smart reset/ manual

Automatic

Informational

Automatic

Troubleshooting (Wireless Controls)

Locations of LEDs, Test button, Test Symbols, and Error Codes

The receiver for all models has four LEDs: LED1, LED2, LED3, and LED5. Figure 61 shows their locations.

Note: To view LEDs on a flush mount receiver on a fan-

coil unit, the front panel of the unit must be removed.

Figure 61. LED locations on the receiver

The sensor for model WZS have four LEDs: LED1, LED2, LED3, and LED5. The sensor for model WDS has test symbols and error codes that appear on the display. All three sensor models have a Test button. Figure 62, p. 95 shows their locations.

94 UV-SVN02C-EN

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Diagnostics

LED1 LED2

LED3 LED5

Test button

WZS sensor

Test symbols

Error code

Test button

WDS sensor

Figure 62. LED, Test button, and symbol locations on

the sensor

Error codes appear on the display of the model WDS sensor when diagnostics occur (see Tab l e 3 8 ).

Ta b l e 3 8. Diagnostics on the sensor (wireless controls)

Error code LED state when Test button is pressed (WZS sensor)

N/A E0, E5, E7 Sensor failure

LED1: Off LED2: Off

(a)

LED3

: 1-blink pattern

repeated 3 times LED1: Off

LED2: Off

(a)

LED3

: 2-blink pattern

repeated 3 times LED1: Off

LED2: Off

(a)

LED3

: 3-blink pattern

repeated 3 times LED1: Off

LED2: Off

(a)

LED3

: 4-blink pattern

repeated 3 times

(a) Blink pattern is On for 1/4 s, Off for 1/4 s, with 2 s Off between repe-

titions.

(WDS

sensor

display) Indicates...

• Replace sensor

E1 Disassociated

E2 Address set to 000

E3 Software error

E4 Input voltage too high

• Sensor is not associated with a receiver.

• Address not set to between 001–999.

• Replace sensor

• No RF transmission is permitted with an input battery voltage greater than

3.9 V.

LED1, LED2, and LED3, located on the receiver of all models, respond to diagnostics by exhibiting specific blinking patterns. They respond independently of any user action (see Table 39).

Diagnostics (Wireless Controls)

LED1, LED2, and LED3, located on the sensor of model WZS respond to diagnostics by exhibiting specific blinking patterns. View their response by pressing the Test button (see Table 38, p. 95).

Table 39. Diagnostics on the receiver (wireless controls)

LED state Indicates...

LED1: Off LED2: Off LED3: 1-blink pattern repeated continuously

LED1: Off LED2: Off LED3: 2-blink pattern repeated continuously

LED1: Off LED2: Off LED3: 3-blink pattern repeated continuously

(a) Blink pattern is On for 1/4 s, Off for 1/4 s, with 2 s Off between repe-

titions.

Disassociated

• Receiver is not associated, waiting for a

(a)

sensor.

• Receiver lost communication with sensor.

• Receiver has no devices on its wireless personal area network.

• Association with a device has been manually removed.

Address set to 000

• Address not set to between 001–999.

Not configured

• Receiver configuration properties not properly set (defective receiver).

Testing Signal Strength (Wireless Controls)

To initiate a signal strength test, push the Test button on the sensor (see location of Test button in Figure 62).

• Models WZS: LED1, LED2, and LED3 respond by

indicating signal strength. You can view them on the sensor (Ta bl e 40) and the receiver (Ta bl e 41).

del WDS: Test symbols on the sensor display

• Mo

indicate signal strength (Ta bl e 40). LED1, LED2, and LED3, on the receiver, respond by indicating signal strength (Ta bl e 41).

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Diagnostics

Table 40. Observing signal strength on the sensor

eless controls)

(wir

Symbol (WDS

User action

None LED1: Off

Press Test button on the sensor

LED state (WZS sensors)

LED2: Off LED3: Off

LED1: Off LED2: Off LED3: Off

LED1: On LED2: On LED3: On Displays for 5 seconds, then constantly Off

LED1: Off LED2: On LED3: On Displays for 5 seconds, then constantly Off

LED1: Off LED2: Off LED3: On Displays for 5 seconds, then constantly Off

sensor display) Indicates...

No Test symbols appear

Normal state

• No Test button press.

Associated; no communication with receiver

• Associa ted, but no signal from the receiver after pressing Test button.

Excellent signal strength

•Good signal margin for reliable communication.

Satisfactory signal strength

• Adequate signal strength for reliable communication.

• Moving sensor or receiver may improve signal strength.

• Increased channel switching may reduce battery life.

Poor signal strength

•Unreliable communication.

• Strongly recommend moving the sensor or receiver to a better location.

• On model WDS, push the Test button on the sensor (see location on Figure 62, p. 95). In response, a battery test symbol appears on the display. The symbol shown indicates battery life expectancy (see Ta bl e 43).

Table 42. Battery status: LED5 on model WZS sensors

(wireless controls)

User action LED state (WZS) Indicates...

Press Test button

None Blinking red: 1-bl ink

Solid green for 5 seconds Battery is adequate for proper

Solid red for 5 seconds 25% battery life left. Batteries sh ould

No light Batteries life expired or not installed

(a)

pattern times. Cycle repeats every 15 minutes.

(a) Blink pattern is On for 1/4 s, Off for 3/4 s, with 2 s Off between repe-

titions.

repeated 5

operation.

be replaced.

properly, or sensor is defective. Approximately 14 days of operation

remain before the batt ery i s too we ak to power the sensor.

Table 43. Battery status: Battery symbol on model WDS

sensor display (wireless controls)

User action

Press Test button

Battery test symbol Indicates...

Full battery power.

50% battery life left.

Table 41. Observing signal strength on the receiver

(wireless controls)

User action

None LED1: Off

Press Test button on the sensor

LED state (receiver, all models) Indicates...

Normal state LED2: Off LED3: Off

LED1: On LED2: On LED3: On Displays for 5 seconds, then constantly Off

LED1: Off LED2: On LED3: On Displays for 5 seconds, then constantly Off

LED1: Off LED2: Off LED3: On Displays for 5 seconds, then constantly Off

• No Test button press.

Excellent signal strength

• Good signal margin for reliable communication.

Satisfactory signal strength

• Adequate signal strength for reliable communication.

• Moving sensor or receiver may improve signal strength.

• Increased channel switching may reduce battery life.

Poor signal strength

• Unreliab le communication

• Strongly recommend moving the sensor or receiver to a better location

Testing Battery Status (Wireless Controls)

Initiate a battery status test as follows:

• On model WZS, push the Test button on the sensor (see location on Figure 62, p. 95). LED5 on the sensor responds by indicating shown in Ta bl e 42, p. 96.

the level of battery strength, as

25% battery life left. Replace batteries. Flashing symbol indicates that approximately 14 days of operation remain before the battery is too weak to power the sensor.

24 V Power Status Indicator (Wireless Controls

LED5 on the receiver of all models (Figure 61, p. 94) lights and stays constantly On when 24 V power is normal.

Using the Wireless Sensor System to Check Signal Strength on a Site (Wireless Controls)

Follow these steps to check the signal strength on a site:

1. Power up a receiver with a 24 V transformer (user supplied)

2. Associate the sensor to a recei intended for the job

3. Place the receiver at the desired location

4. Place or hold the sensor at the desired location

5. Press the Test button (S5) on the signal strength as indicated by LED1, LED2, and LED3 on model WZS, and on the display on model WDS (Figure 62, p. 95).

ver of the same model

the sensor and observe

96 UV-SVN02C-EN

Page 97

For more information on interpreting the LEDs and the display symbols that indicate signal strength, see “Testing

Signal Strength (Wireless Controls),” p. 95.

Replacing Sensor Batteries (Wireless Controls)

Sensor battery type, length of life, and installation are addressed in this section.

Battery Type (Wireless Controls)

NOTICE:

Equipment Damage!

The batteries are manufactured in a ready-to-use state. They are not designed for recharging. Recharging can cause battery leakage or, in some cases, can cause the safety release vent to open.

NOTICE:

Equipment Damage!

Do not attempt to hook up the sensor to a power supply. Equipment damage may result.

Use two non-rechargeable 1.5 V lithium AA batteries in the sensor. To maintain UL rating, use only UL-listed lithium batteries. The sensor ships with Energizer already installed. Replacement batteries are available at Trane Service Parts Centers (p/n X13770035010) or other local suppliers.

L91 batteries

Battery Life (Wireless Controls)

Battery life is five years under normal conditions. If the sensor is not used for an extended period of time, do one of the following:

• Set the sensor address to 000 to place the sensor into a low-power hibernation mode.

• Remove the batteries

Notes:

f lithium batteries are temporarily unavailable,

• I alkaline batteries can be used. However, alkaline battery life is very short by comparison.

• The battery life for a model WDS may decrease with extended LCD display activity.

Battery Installation (Wireless Controls)

WARNI NG

Prevent Injury!

Batteries can explode or leak and cause burns if installed backwards, disassembled, charged, or exposed to water, fire, or high temperature.

Diagnostics

WARNING

Prevent Injury!

Keep away from small children. If swallowed, contact your local poison control center immediately.

6. Observe the polarity indicators that are molded into the cover.

7. Install two batteries (of

Type (Wireless Controls),” p. 97) in the battery-holding

slot that is molded into the sensor cover.

The sensor has been designed to prevent damage if the

teries are installed backwards, to reduce the potential

bat for injury.

Manual Association (Wireless Controls)

Before attempting manual or automatic association, the receiver must indicate readiness to associate (one blink pattern of LED3 on receiver). Refer to “Observing the

Receiver for Readiness to Associate,” p. 36.

At any time, the manual association method can be used to associate the receiver with the sensor. If an association was previously established between a receiver and a sensor and needs to be re-established, the manual association process may be used. If an association has not yet been established, the automatic association process is recommended (see “Associating the Sensor to the

Receiver,” p. 36).

8. Using a small screwdriver, set the three rotary address

hes (Figure 36, p. 35, locations S1, S2, S3) on the

switc receiver to an address between 001 and 999.

Notes:

• An ad

• An address can be changed at any time after initial

9. Set the three rotary address switches (Figure 36, p. 35, locations S1, S2, S3) on the sensor as the receiver.

10. Record the address and location of the re sensor pair.

• Af

dress can be changed without powering

down the receiver or sensor.

association has been established.

ter verifying that the receiver and sensor are powered up, press the Test button on the sensor to establish that the signal strength (“Testing Signal

Strength (Wireless Controls),” p. 95) and the battery

life “Testing Battery Status (Wireless Controls),”

p. 96) are adequate for proper functioning.

Disassociation (Wireless Controls)

The receiver disassociates from the sensor (by removing all stored association information), conducts a channel scan, and restarts itself, if any of the following are true:

• The receiver address is c setting (001–999)

the type specified in “Battery

to the same address

ceiver and

hanged from its current

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Diagnostics

• The receiver receives a disassociation notification from its associated sensor

• The receiver does not receive a communication from its associated sensor w

• The sensor and receiver communicating at the time the sensor is set to 000 and the Test button is pressed.

Note: A

disassociated sensor will transit an association

request every 10 minutes.

ithin 50 minutes.

are associated and

Sensor/Receiver Compatibility (Wireless Controls)

Version 1.5 (p/n X13790854 and X13790855) and higher receivers are compatible with all sensors models and support all functions. Receivers released prior to version

1.5 are compatible with only model WZS.

Replacing a Failed Sensor or Receiver (Wireless Controls)

Note: Receivers ship installed on the unit. To remove the

receiver, press in the retention tabs on the underside of the receiver enclosure and push upward.

To replace a failed sensor or receiver:

11. Confirm that the device is disassociat and Ta bl e 39, p. 95).

12. Set the rotary address switc match the address of the remaining sensor or receiver.

Note: There

13. Apply power to the new device. Association between

new and the remaining devices will automatically

the occur.

Note: When replac

(version 1.5 or higher) will automatically configure the sensor to match the last stored configuration, if the sensor has not been placed into configuration mode and the factory default configuration is still valid. If the sensor configuration does not match the desired system features, it can be manually configured (see “Manual Association (Wireless

Controls),” p. 97).

is no need to remove power from the

remaining device.

ing a WDS sensor, the receiver

h of the new device to

ed (see Ta bl e 38

Servicing and Testing (Wireless Controls)

If the wireless sensor system is not working as expected, use the tools and procedure described in this section.

Servicing and Testing Tools (Wireless Controls)

No special tools or software are necessary to service and test the wireless sensor system. Test the system by using:

• The LEDs on the receiver, LE sensor, and the display on the model WDS sensor

• The Test button on the sensor

• The address test mode on the receiver

Ds on the model WZS

• A common volt-ohm meter

Procedure for Testing the Wireless Sensor System (Wireless Controls)

If the wireless sensor system is not working as expected:

1. Observe LED5 on the receiver. LED5 is On solid green whenever the receiver is powered.

2. Verify that the receiver is pro GND-SIGNAL (black) wire and the GND-POWER (yellow) wire must be grounded.

3. Press the Test button on the sensor.

del WZS: LED5 should turn On solid green,

• Mo

indicating proper battery strength. LED1, LED2, and LED3 will indicate signal strength.

Note: When checking signal strength, both LED1

and LED3 on the receiver and sensor illuminate in unison if the sensor and receiver are associated. Use this feature to confirm association.

• Model WDS: Battery life (“Testing Battery Status

(Wireless Controls),” p. 96) and signal strength

(“Testing Signal Strength (Wireless Controls),”

p. 95) are indicated on the display.

perly grounded. Both the

Procedure for Testing the Receiver (Wireless Controls)

If the receiver is not working as expected:

1. Verify that the receiver is powered.

2. Set the receiver address t temperature output and zone temperature setpoint output to their default mode values (see “Output

Values—Failure and Default Modes of Operation (Wireless Controls),” p. 99).

3. Measure the receiver output resistance (see

“Measuring Output Resistance (Wireless p. 99).

4. When the test is complete, reset the its previous setting.

5. Press the Test button on the sensor to force re-

ociation.

ass

6. Confirm association and communication by noting

ED1, LED2, and LED3 as described in “Testing Signal

Strength (Wireless Controls),” p. 95.

o 000 to force the zone

Controls),”

receiver address to

Forcing a Sensor to Transmit (Wireless Controls)

To force a wireless sensor to transmit during servicing, press the Test button on the sensor.

Output Power Level (Wireless Controls)

The maximum output power level of a wireless sensor set is controlled by software and restricted by channel of operation and agency requirements per country or region. The sensor has a default maximum power level of 10 mW,

98 UV-SVN02C-EN

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Diagnostics

but the receiver determines the ultimate output power level of the sensor.

Output Values—Failure and Default Modes of Operation (Wireless Controls)

The following table provides output values for failure and default modes of operation, which can be used for troubleshooting.

Table 44. Output values

Zone temperature

Situation

Receiver address = 000 11.17 kΩ,

Receiver address = 001 to 999 and: Receiver is powered up, but not is associated, or Receiver has received a disassociation request from the associated sensor.

Receiver address = 001 to 999 and receiver has not received a communication within 35 minutes from the associated sensor.

Receiver has no power. Open Open Open Open Thermistor in sensor

has failed to either open or close.

Setpoint potentiometer has failed to either open or close.

output

72.5°F (22.5°C), indefinitely

11.17 kΩ,

72.5°F (22.5°C) Hold for 15 minutes, then open

Open Open Open Open

Open Normal

Normal value Open Open N/A

Zone setpoint output

451 Ω,

72.5°F (22.5°C), indefinitely

451 Ω,

72.5°F (22.5°C), Hold for 15 minutes, then open

value

Heating setpoint output

501 Ω,

70.5°F (21.4°C), indefinitely

501 Ω,

70.5°F (21.4°C), indefinitely

Normal value

Fan/ System output

2320 Ω Fan = Auto System = Off

N/A

Measuring Output Resistance (Wireless Controls)

To measure the resistance of receiver outputs for zone temperature and setpoints for all models, and heating setpoint and fan/system for the WDS:

1. Ensure that the GND-SIGNAL (black) wire and the GND-POWER (yellow) wire are grounded to the transformer.

2. Disconnect the ZONE (white) and SETPOINT (RED) wires from the controller. Disconnect the HEAT SETPOINT (brown) and FAN/SYSTEM (green) wires from the controller, if applicable.

3. Measure resistance as follows:

a. All models: Measure between the grounded GND-

AL (black) wire and either the SETPOINT (red)

SIGN or ZONE (white) wire. Compare resistance measurements to those in Table 45, p. 99.

b. WDS only: Measure between the grounded GND-

SIGNAL (black) wire and the FAN/SYSTEM (green) wire. Compare resistance measurements to those given in Table 46, p. 99.

Note: The output circuits are not electrically

powered; consequently, resistance can be

measured without risk of damage to the volt-ohm meter.

Table 45. Receiver resistance table for all models

(wireless controls)

Nominal setpoint

Nominal zone Zone or setpoint temperature

55°F (12.8°C) 17.47 kΩ 792 Ω 60°F (15.6°C) 15.3 kΩ 695 Ω 65°F (18.3°C) 13.49 kΩ 597 Ω 70°F (21.1°C) 11.9 kΩ 500 Ω 75°F (23.9°C) 10.5 kΩ 403 Ω 80°F (26.7°C 9.3 kΩ 305 Ω 85°F (29.4°C) 8.25 kΩ 208 Ω

temperature output

resistance

and heating setpoint output resistance

Table 46. Receiver resistance table for model WDS

(wireless controls)

Fan command Nominal output resistance

High 16,130 Ω Med 13,320 Ω Low 10,770 Ω Auto 2320 Ω Off 4870 Ω

Cleaning the Sensor (Wireless Controls)

NOTICE:

Equipment Damage!

Spraying glass cleaner or any other solution directly on the sensor may damage it.

You can clean the sensor by applying glass cleaner to a soft, non-abrasive cloth, and gently wiping the face, including the buttons and LCD display. Use of a premoistened towelette designed for lens or screen cleaning is also acceptable.

Avoid inadvertent pressing of the Occupied/Unoccupied buttons on the keypad on the WDS sensor as this may result in an unwanted timed override or settings change.

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Diagnostics

Troubleshooting (Tracer ZN520)

If the LED is off, either the power is off, an abnormal condition is present or the TEST button is pressed.

Yellow COMM LED (Tracer ZN520)

If the LED is off continuously, the controller is not detecting any communication. This is normal for units in standalone applications.

If the LED blinks, the controller detects communication.

If the LED is on continuously, this indicates an abnormal condition.

Manual Output Test (Tracer ZN520)

The purpose of the manual output test sequence is to verify output and end device operation. Use the manual output test to:

• Verify output wiring and operation without using Rover, service tool

• Force the water valve to open and system

Note: Th

1. Green STATUS LED

Indicates Whether the Controller is Powered On (24 Vac Supplied)

2. Yellow COMM LED

Indicates if Communication is Functioning

3. Red SERVICE LED

Indicates if Service is Needed

Red SERVICE LED (Tracer ZN520)

During normal operation, the LED is off continuously when power is applied to the controller.

If the LED is on continuously, even when power is applied to the controller means that someone is pressing the SERVICE button or that the controller has failed.

If the LED flashes once every second, use Rover, Trane’s service tool, to restore the unit to normal operation. Refer to the Rover product literature for more information.

Note: If the Service button is held down for more than

15 seconds on the Tracer ZN520 controller, it will uninstall itself from the ICS communication network and shut down all unit operation.

Green STATUS LED (Tracer ZN520)

During normal operation, the LED is on continuously.

If the LED blinks once, the controller is in Manual output test mode.

If the LED blinks twice the controller is in Manual output test mode, with one or more diagnostics present.

If the LED blinks (1/4 second on, 1/4 second off for 10 seconds) the controller is in the “Wink” mode.

Note: The “wink” feature allows the identification of a

particular controller. When sending a request from a device, such as Rover, the controller will “wink” to indicate it received the signal.

100 UV-SVN02C-EN

The controller observes all diagnostics that occur during the test sequence. Although an automatic diagnostic reset sequence exists as part of the controller’s normal operation, the automatic diagnostic reset feature is not active during the test sequence.

If left in an individual test step, the controller remains in test mode for 60 minutes and then exits to normal operation.

Many service calls are due to unit diagnostics. The test sequence resets unit diagnostics and attempts to restore normal unit operation prior to testing the outputs. If the diagnostics remain after a reset, the STATUS LED indicates the diagnostic condition is still present (two blinks).

Manual Output Test Procedure (Tracer

ZN520)

Follow the procedure below to test Tracer ZN520 controllers.

1. Press and hold the TEST button for at least two

2. The test sequence will turn of

3. Press the TEST button sev

The outputs are not subject to minimum times during the test sequence. However, the test sequence only permits one step per second which limits minimum output time.

The green LED is turned off when the TEST button is pressed. To begin the manual output test mode, press and hold the TEST button (turning off the green LED) for at least

e manual output test is not an automatic cycle. You must press the TEST button to proceed through each step.

seconds (not exceeding 5 seconds), and then release, to start the test mode.

attempt to clear all diagnostics.

than once per second) to advance through the test sequence.

balance the hydronic

f all outputs and then

eral more times (no more

Trane HUVC Installation, Operation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual