Trane Voyager, YC*330B, 360B, 420B, 480B Installation and Maintenance Manual

...

Download

Installation, Operation, and Maintenance

Voyager™ Commercial

27.5 to 50 Ton 60 Hz

22.9 to 41.7 Ton 50 Hz CV, VAV, or SZ VA V Rooftop Air Conditioners with ReliaTel™ Controls, R-410A Refrigerant

Model Numbers

“B” and later design sequence TC*, TE*, YC*330B, 360B, 420B, 480B, 600B (60 Hz/3 phase) TC*, TE*, YC*275B, 305B, 350B, 400B , 500B (50 Hz/3 phase)

SAFETY WARNING

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and airconditioning 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 pr ecautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

June 2014

RT-SVX34H-EN

Proprietary and Confidential

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings,

cautions and notices appear at appropriate intervals throughout this manual. Warnings are provided 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 situatio n 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.

ATTENTION: Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. R ead 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

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 Personal Protective Equipment (PPE) recommended for the work being undertaken. AL W A Y S ref er to appropr iate 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 recommendations.

• If there is a risk of ar c or flash, tec hnicians MUST put on all Personal Protective Equipment (PPE) in accordance with NFPA 70E or other country-specific requirements fo r arc flash protection, PRIOR to servicing the unit.

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

WARNING

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. T rane advocates the responsible handling of all refrigerantsincluding 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

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, y ou MUST follow requirements f or 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.

Overview of Manual

One copy of the appropriate service literature ships inside the control panel of each unit. The procedures discussed in this manual should only be performed by qualified, experienced HVAC technicians.

Note: Do not release refrigerant to the atmosphere! If

adding or removing refrigerant is required, the service technician must comply with all federal, state, and local laws.

This booklet describes the proper installation, startup, operation, and maintenance procedures for TC_, TE_, and YC_22.9 to 50 Ton CV (Constant Volume), V AV (Variable Air V o lu me), and SZ VAV (Single Zone Variable Air Volu me) applications. Refer to the table of contents for a listing of specific topics. Refer to “Diagnostics,” p. 117 for troubleshooting information.

By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component dama ge will be minimized.

It is important that periodic maintenance be performed to help assure trouble free operation. A maintenance schedule is provided at the end of this manual. Should equipment failure occur, contact a qualified service organization with qualified, experienced HVAC technicians to properly diagnose and repair this equipment.

Revision History

RT-SVX34G-EN (3 June 2014)

• Added features: Low Leak Damper option, eStage, Ultra Low Leak Power Exhaust, Touchscreen Human Interface.

• Updated Model Number Description, Startup, Sequence of Operation, Diagnostics, Unit Wiring Diagrams.

Warnings, Cautions and Notices

60 Hz units with standard options are certified by Underwriters Laboratory.

RT-SVX34H-EN 3

Model Number Description . . . . . . . . . . . . . . . 8

60 Hz Description . . . . . . . . . . . . . . . . . . . . . . 8

50 Hz Description . . . . . . . . . . . . . . . . . . . . . 10

General Information . . . . . . . . . . . . . . . . . . . . 12

Commonly Used Acronyms and Abbrevia-

tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

About the Unit . . . . . . . . . . . . . . . . . . . . . 12

Precautionary Measures . . . . . . . . . . . . . 13

Unit Inspection . . . . . . . . . . . . . . . . . . . . . 13

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Unit Dimensions and Weights . . . . . . . . . . . 14

Recommended Clearances . . . . . . . . . . . . . 14

Roof Curb and Ductwork . . . . . . . . . . . . . . . 14

Horizontal Ductwork . . . . . . . . . . . . . . . . . 14

Unit Rigging and Placement . . . . . . . . . . . 20

Installation General Requirements . . . . . . . 23

Condensate Drain Connection . . . . . . . . . . 23

Condensate Overflow Switch . . . . . . . . . . . 23

O/A Sensor & Tubing Installation . . . . . . . 23

Units with Statitrac™ . . . . . . . . . . . . . . . . . 23

Installation Electrical . . . . . . . . . . . . . . . . . . . . 25

Disconnect Switch External Handle (Factory Mounted Option)

. . . . . . . . . . . . . . . . . . . . . 25

Main Power Wiring . . . . . . . . . . . . . . . . . . . 25

Through-the-Base Electrical (Optional Acces-

sory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Electrical Wire Sizing and Protection Device Equations

Low Voltage Wiring . . . . . . . . . . . . . . . . . 30

Control Power Transformer . . . . . . . . . . . 30

Field Installed AC Control Wiring . . . . . . 30

Field Installed DC Control Wiring . . . . . . 31

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Remote Panels and Sensors . . . . . . . . . . . 34

Constant Volume and Single Zone VAV Con-

trol Options . . . . . . . . . . . . . . . . . . . . . . . . 34

Variable Air Volume (non-SZ VAV) Control

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Installation Piping . . . . . . . . . . . . . . . . . . . . . . 38

General Requirements . . . . . . . . . . . . . . . . 38

Connecting the Gas Supply Line to the Fur-

nace Gas Train . . . . . . . . . . . . . . . . . . . . . .38

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Unit Control Modules . . . . . . . . . . . . . . . . . .40

RTRM - ReliaTel™ Refrigeration Module .40 ECA/RTEM - Economizer Actuator/ReliaTel

Economizer Module (Optional) . . . . . . . . .40

EBA - Exhaust Blade Actuator (Optional) .40 RTAM - ReliaTel Air Handler Module (Stan-

dard with Traditional VAV) . . . . . . . . . . . .40

ReliaTel Ventilation Module (RTVM) . . . .41

ReliaTel Dehumidification Module

(RTDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Conventional Thermostat Connections

(Available Only with CV) . . . . . . . . . . . . . .42

TCI - Trane Communication Interface (Option-

al) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

LCI - LonTalk® Communication Interface (Op-

tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

BCI - BACnet® Communication Interface (Op-

tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Trane Wireless Comm Interface (WCI) . . . 4 2 TD5 Display - 5" Touchscreen Display . . .42

System Operation . . . . . . . . . . . . . . . . . . . . .43

Economizer Operation with a Conventional

Thermostat (CV Only) . . . . . . . . . . . . . . . .43

Microelectronic Control Features . . . . . . .43

Economizer Operation with CV Controls .44

Modulating Power Exhaust . . . . . . . . . . . .44

Mechanical Cooling without an Economizer

(CV and SZ VAV) . . . . . . . . . . . . . . . . . . . .44

Zone Temperature - Occupied Cooling (CV

and SZ VAV) . . . . . . . . . . . . . . . . . . . . . . . .45

Zone Temperature - Occupied Heating (CV

and SZ VAV) . . . . . . . . . . . . . . . . . . . . . . . .45

Supply Fan (CV and SZ VAV) . . . . . . . . . .45

Supply Air Tempering (CV and SZ VAV) .45

Variable Air Volume Applications (Single Zone VAV)

Supply Fan Output Control . . . . . . . . . . . .46

Minimum Supply Fan Output . . . . . . . . . .46

Supply Fan Mode Operation . . . . . . . . . . .47

. . . . . . . . . . . . . . . . . . . . . . . . . . . .46

4 RT-SVX34H-EN

Table of Contents

Setpoint Arbitration . . . . . . . . . . . . . . . . . 47

Ventilation Control . . . . . . . . . . . . . . . . . . 50

Space Pressure Control . . . . . . . . . . . . . . 52

Traq Overrides and Special

Considerations . . . . . . . . . . . . . . . . . . . . . 53

Supply Air Temperature Control - Heating

and Cooling . . . . . . . . . . . . . . . . . . . . . . . . 53

Variable Air Volume Applications (Traditional VAV)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Supply Air Temperature Control - Occupied

Cooling and Heating . . . . . . . . . . . . . . . . 53

Supply Air Temperature Control with an

Economizer . . . . . . . . . . . . . . . . . . . . . . . . 54

VHR Relay Output . . . . . . . . . . . . . . . . . . . 54

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied

Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied

Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Morning Warm-up (MWU) Control . . . . . 54

Daytime Warm-up (DWU) Control . . . . . 54

Supply Duct Static Pressure Control . . . 54

Supply Air Temperature Reset . . . . . . . . 55

VAV Supply Air Tempering (Only Available

with Modulating Gas Heat) . . . . . . . . . . . 55

Constant Volume or Variable Air Volume Applications (Single Zone or Traditional)

Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Zone Temperature - Unoccupied Cooling (CV

or SZ VAV Only) . . . . . . . . . . . . . . . . . . . . 55

Zone Temperature - Unoccupied Heating 55 Mechanical Cooling with an Economizer 56

Gas Heat Control . . . . . . . . . . . . . . . . . . . 56

Electric Heat Control . . . . . . . . . . . . . . . . 56

Clogged Filter Option . . . . . . . . . . . . . . . . 56

Ventilation Override . . . . . . . . . . . . . . . . . 57

Emergency Stop . . . . . . . . . . . . . . . . . . . . 57

Phase Monitor . . . . . . . . . . . . . . . . . . . . . 57

Low Pressure Control . . . . . . . . . . . . . . . . 57

Dehumidification Low Pressure Control . 57 High Pressure Cutout and Temperature Dis-

charge Limit . . . . . . . . . . . . . . . . . . . . . . . 57

Power Exhaust Control (Standard) . . . . . 58

. . . 55

Space Pressure Control - Statitrac . . . . . .58

Power Exhaust Control (Tracking) . . . . . .58

Lead/Lag Control . . . . . . . . . . . . . . . . . . . .58

Coil Frost Protection . . . . . . . . . . . . . . . . .59

Dehumidification Frost Protection . . . . . .59

Drain Pan Condensate Overflow Switch (Op-

tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

VFD Programming Parameters . . . . . . . . .59

Condenser Fan Sequencing Control . . . . .59

Preparing the Unit for Operation . . . . . . . .62

Electrical Phasing . . . . . . . . . . . . . . . . . . . .62

Voltage Supply and Voltage Imbalance . .63

Starting the Unit . . . . . . . . . . . . . . . . . . . . . . .63

Test Modes . . . . . . . . . . . . . . . . . . . . . . . . .63

Verifying Proper Fan Rotation . . . . . . . . . .68

Verifying Proper Air Flow (CFM) -

CV or VFD's . . . . . . . . . . . . . . . . . . . . . . . . .68

Exhaust Fan Operation . . . . . . . . . . . . . . .75

Economizer Damper Adjustment . . . . . . . .77

Economizer (O/A) Dampers . . . . . . . . . . . .77

For Models with Ultra-Low

Leak Economizers . . . . . . . . . . . . . . . . . . .79

Manual Outside Air Damper . . . . . . . . . . .81

Starting the Compressor . . . . . . . . . . . . . . .82

Starting 27.5 to 35 Ton Standard Efficiency

Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Starting 40 to 50 Ton Standard Efficiency

Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Starting 27.5-50 Ton High Efficiency Units 82

Line Weights . . . . . . . . . . . . . . . . . . . . . . . .82

Compressor Oil . . . . . . . . . . . . . . . . . . . . .84

Scroll Compressor Operational Noises . .97

Compressor Crankcase Heaters . . . . . . . .97

Charging by Subcooling . . . . . . . . . . . . . .97

Measuring Subcooling . . . . . . . . . . . . . . .97

Gas Heat Units . . . . . . . . . . . . . . . . . . . . . . . .97

Electric Heat Units . . . . . . . . . . . . . . . . . . . . .98

Final Unit Checkout . . . . . . . . . . . . . . . . . . . .98

For Constant Volume Units . . . . . . . . . . . .98

For Variable Air Volume Units . . . . . . . . .98

For Single Zone Variable Air Volume

RT-SVX34H-EN 5

Table of Contents

Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . 100

General Unit Requirements . . . . . . . . . . . 100

Downflow/Upflow Models: . . . . . . . . . . 100

All Units: . . . . . . . . . . . . . . . . . . . . . . . . . 100

Electrical Requirements . . . . . . . . . . . . . . 100

Field Installed Control Wiring . . . . . . . . 100

Gas Heat Requirements . . . . . . . . . . . . . . 100

Sequence of Operation . . . . . . . . . . . . . . . . . 101

Mechanical Cooling Sequence Of Operation

Units Without an Economizer . . . . . . . . 101

Economizer Operation Based on

Dry Bulb . . . . . . . . . . . . . . . . . . . . . . . . . 101

Economizer Operation Based on Reference

Enthalpy . . . . . . . . . . . . . . . . . . . . . . . . . 102

Economizer Operation Based on Compara-

tive Enthalpy . . . . . . . . . . . . . . . . . . . . . . 102

Economizers with Traq . . . . . . . . . . . . . 102

. . . . . . . . . . . . . . . . . . . . . . . . 101

Dehumidification (Modulating Hot Gas Reheat) Sequence of Operation

Sensible cooling or heating control overrides

dehumidification control. . . . . . . . . . . . 103

. . . . . . . . . . 103

Gas Heat Sequence Of Operation . . . . . . 103

Constant Volume (CV) Unit Fan

Operation . . . . . . . . . . . . . . . . . . . . . . . . 104

Variable Air Volume (VAV) Unit Fan Operation (2 Stage and Modulating Gas Heat) 104

Variable Air Volume (VAV) Unit Fan Opera-

tion (Modulating Gas Heat Only) . . . . . 104

Ignition Control Module . . . . . . . . . . . . . 104

High Temperature Limit Operation and Loca-

tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Electric Heat Sequence Of Operation . . . 104

Constant Volume (CV) . . . . . . . . . . . . . . 104

Variable Air Volume (VAV) . . . . . . . . . . 105

Variable Air Volume Applications (Single Zone VAV) Sequence of Operation

Occupied Cooling Operation . . . . . . . . . 105

Occupied Heating Operation . . . . . . . . . 106

Unoccupied Cooling and

Heating Operation . . . . . . . . . . . . . . . . . 106

Dehumidification Operation . . . . . . . . . 106

. . . . . 105

Failure and Overriding Conditions . . . . .107

Low Pressure Control (LPC) Sequence of Operation (ReliaTel Control)

. . . . . . . . . . . . . .108

High Pressure Control and Temperature Discharge Limit (ReliaTel Control)

. . . . . . . . .108

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Fan Belt Adjustment . . . . . . . . . . . . . . . . . .109

Monthly Maintenance . . . . . . . . . . . . . . . . .111

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111

Condensate Overflow Switch . . . . . . . . .111

Cooling Season . . . . . . . . . . . . . . . . . . . .111

Heating Season . . . . . . . . . . . . . . . . . . . .112

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . .113

Fall Restraint . . . . . . . . . . . . . . . . . . . . . . . . .113

Refrigeration System . . . . . . . . . . . . . . . . .114

Refrigerant Evacuation and Charging . .114

Charge Storage . . . . . . . . . . . . . . . . . . . .114

Compressor Oil . . . . . . . . . . . . . . . . . . . .114

Compressor Replacements . . . . . . . . . . . .115

Electrical Phasing . . . . . . . . . . . . . . . . . . .115

Precision Suction Restrictor . . . . . . . . . .115

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . .117

System Status/Diagnostics . . . . . . . . . . . .117

Terminal locations . . . . . . . . . . . . . . . . . .117

System Status / Diagnostics checkout proce-

dure (DC volt meter required) . . . . . . . . .117

Diagnostics (CV and SZ VAV Units Only) 118

Diagnostics (VAV only) . . . . . . . . . . . . . .118

Resetting Cooling and Ignition Lockouts 119 Zone Temperature Sensor (ZSM) Service In-

dicator . . . . . . . . . . . . . . . . . . . . . . . . . . . .119

RTRM Zone Sensor Module (ZSM) Tests 120 Programmable & Digital Zone Sensor

Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120

ReliaTel Refrigeration Module (RTRM) .121 Economizer Actuator (ECA/RTEM)

Test Procedures . . . . . . . . . . . . . . . . . . . .121

ReliaTel Air Module (RTAM) Tests . . . . .122

ReliaTel Air Module (RTOM) Tests . . . . .123

Compressor—Blink Codes . . . . . . . . . . . .124

Troubleshooting . . . . . . . . . . . . . . . . . . . . . .124

6 RT-SVX34H-EN

TR-200 VFD Programming Parameters . 130

Unit Wiring Diagram Numbers . . . . . . . . . . 132

Warranty and Liability Clause . . . . . . . . . . . 138

COMMERCIAL EQUIPMENT - 20 TONS AND LARGER AND RELATED ACCESSORIES

138

Table of Contents

RT-SVX34H-EN 7

Model Number Description

YCD 330 B E L A 0 A1 123 456 7 8 9 10 11 1213

60 Hz Description

Digit 1, 2 — Unit Function

TC = DX Cooling, No Heat TE = DX Cooling, Electric Heat YC = DX Cooling, Natural Gas Heat

Digit 3 — Unit Airflow Design

D = Downflow Supply and Return H = Horizontal Supply and Return F = Horizontal Supply and Upflow

Return

R = Downflow Supply and Horizontal

Return

Digit 4, 5, 6 — Nominal Cooling Capacity

330 = 27½ Tons 360 = 30 Tons 420 = 35 Tons 480 = 40 Tons 600 = 50 Tons

Digit 7 — Major Development Sequence

B = R-410A Refrigerant

Digit 8 — Power Supply

E = 208/60/3 F = 230/60/3 4 = 460/60/3 5 = 575/60/3

Digit 9 — Heating Capacity

0 = No Heat (TC only) L = Low Heat (YC only) H = High Heat (YC only) J = Low Heat-Stainless Steel Gas

Heat Exchanger (YC only)

K = High Heat-Stainless Steel Gas

Heat Exchangers (YC only)

M = Low Heat-Stainless Steel Gas

Heat Exchanger w/ Modulating control (27.5-35 ton YC only)

P = High Heat-Stainless Steel Gas

Heat Exchangers w/ Modulating control (27.5-35 ton YC only)

R = Low Heat-Stainless Steel Gas

Heat Exchanger w/ Modulating control (40-50 ton YC only)

T = High Heat-Stainless Steel Gas

Heat Exchangers w/ Modulating control (40-50 ton YC only)

Note: When second digit is “E” for

A = 36 kW (27 kW for 208v) B = 54 kW (41 kW for 208v) C = 72 kW D = 90 kW E = 108 kW

Electric Heat, the following values apply in the ninth digit.

Digit 10 — Design Sequence

A = First

Digit 11 — Exhaust

0= None 1 = Barometric Relief (Available

w/ Economizer only)

2 = 100% Power Exhaust Fan

(Available w/ Economizer only)

3 = 50% Power Exhaust Fan

(Available w/ Economizer only)

4 = 100% Fresh Air Tracking Power

Exhaust Fan (Available w/ Economizer only)

5 = 50% Fresh Air Tracking Power

Exhaust Fan (Available w/ Economizer only)

6 = 100% Power Exhaust w/

Statitrac™

7 = 100% Fresh Air Tracking Power

Exhaust Fan w/ Ultra Low Leak Exhaust Damper (Available w/ Economizer only)

8 = 50% Fresh Air Tracking Power

Exhaust Fan w/ Ultra Low Leak Exhaust Damper (Available w/ Economizer only)

9 = 100% Power Exhaust w/ Ultra L ow

Leak Exhaust Damper w/ Statitrac™

Digit 12 — Filter

A = 2” MERV 4, Std Eff, Throwaway B = 2” MERV 8, High Eff, Throwaway C = 4” MERV 8, High Eff, Throwaway D = 4” MERV 14, High Eff, Throwaway

Filters Filters Filters Filters

Digit 13 — Supply F an Motor, HP

1= 7.5 Hp 2=10 Hp 3= 15 Hp 4 = 20 Hp

Digit 14 — Supply Air Fan Drive Selections3

A = 550 RPM H = 500 RPM B = 600 RPM J = 525 RPM C = 650 RPM K = 575 RPM D = 700 RPM L = 625 RPM E = 750 RPM M = 675 RPM F = 790 RPM N = 725 RPM G = 800 RPM

Digit 15 — Fresh Air Selection

A=No Fresh Air B = 0-25% Manual Damper C = 0-100% Economizer, Dry Bulb

Control

D = 0-100% Economizer,

Reference Enthalpy Control

E = 0-100% Economizer,

Differential Enthalpy Control

F = “C” Option and Low Leak

Fresh Air Damper

G = “D” Option and Low Leak

Fresh Air Damper

H = “E” Option and Low Leak

Fresh Air Damper

J = “C” Option and Ultra Low Leak

Outside Air Damper

K = “D” Option and Ultra Low Leak

Outside Air Damper

L = E Option and Ultra Low Leak

Outside Air Damper 1 = Option “C” with Traq 2 = Option “D” with Traq 3 = Option “E” with Traq 4 = Option “F” with Traq 5 = Option “G” with Traq 6 = Option “H” with Traq 7 = Option “C” with Traq w/ Ultra

Low Leak Outside Air Damper 8 = Option “D” with Traq w/ Ultra

Low Leak Outside Air Damper 9 = Option “E” with Traq w/ Ultra Low

Leak Outside Air Damper

Digit 16 — System Control

1 = Constant Volume w/Zone

Temperature Control 2 = Constant Volume w/ Discharge Air

Control 4 = VAV Supply Air Temperature

Control w/Variable Frequency

Drive w/o Bypass 5 = VAV Supply Air Temperature

Control w/Variable Frequency

Drive and Bypass 6 = Single Zone VAV w/VFD w/o

Bypass 7 = Single Zone VAV w/VFD w/

Bypass

8 RT-SVX34H-EN

Model Number Description

A = VAV Supply Air Temperature

Control w/VFD w/o Bypass w/ Motor Shaft Grounding Ring

B = VAV Supply Air Temperature

Control w/VFD w/Bypass w/Motor Shaft Grounding Ring

C = Single Zone VAV w/VFD w/o

Bypass w/ Motor Shaft Grounding Ring

D = Single Zone VAV w/VFD w/

Bypass w/Motor Shaft Grounding Ring

Note: Zone sensors are not included

with option and must be ordered as a separate accessory.

Miscellaneous Options

Digit 17

A = Service Valves

Note: Service valves cannot be selected

with High Efficiency units (Digit 29 = K or L). Liquid and discharge service valves are included with High Efficiency units.

Digit 18

B = Through the Base Electrical

Provision

Digit 19

C = Non-Fused Disconnect Switch

w/External Handle

Digit 20

D = Factory-Powered 15A GFI

Convenience Outlet and Non-Fused Disconnect Switch w/External Handle

Digit 21

E = Field-Powered 15A GFI

Convenience Outlet

Note: If convenience outlet needed w/

High Fault SCCR, option must be ordered under digit 27.

Digit 22

F = Trane Communication

Interface (TCI)

Digit 23

G = Ventilation Override

Digit 24

H = Hinged Service Access

Digit 25

H = Tool-less Condenser Hail Guards J = Condenser Coil Guards

Digit 26

K = LCI (LonTalk) B = BACnet Communications

Interface (BCI)

Digit 27

0 = 5kA SCCR D = High Fault SCCR w/ Disconnect E = High Fault SCCR w/ Disconnect w/

Powered Convenience Outlet

Digit 28

0 = Pre-Painted Steel Drain Pan M = Stainless Steel Drain Pan 1 = Pre-Painted Steel Drain Pan w/

2 = Stainless Steel Drain Pan w/

Condensate Overflow Switch Condensate Overflow Switch

Digit 29 — Condenser Coil Options

0 = Standard Efficiency J = Corrosion Protected Condenser K = High efficiency unit (eStage)

L = High efficiency unit (eStage) w/

Condenser Coil Coil

Corrosion Protected Condenser Coil

Digit 30-31 — Miscellaneous Options

P = Discharge Temperature R = Clogged Filter Switch

Sensor

Digit 32 — Dehumidification Option

T = Modulating Hot Gas Reheat

Digit 33 — Human Interface

5 = Touchscreen Human Interface, 5"

Model Number Notes

1. All voltages are across the line

starting only.

2. Option includes Liquid, Discharge,

Suction Valves.

3. Supply air fan drives A thru G are

used with 27½-35 ton units only and drives H thru N are used with 40 & 50 ton units only.

4. Electric Heat KW ratings are based

upon voltage ratings of 208/240/480/ 600 V. For a 240 V heater derated to 208 V, the resulting kW rating decreases from 36 kW to 27 kW, and from 54 kW to 41 kW. Voltage offerings are as follows:

Electric

Heater

Rated

Tons

Voltage

27½

to 35

and

5. The service digit for each model

number contains 32 digits; all 32 digits must be referenced.

6. Ventilation override exhaust mode is

not available for the exhaust fan with fresh air tracking power exhaust. V OM is available for the exhaust fan without fresh air tracking power exhaust.

7. High fault is 65kA on 208/230/460V

and 25kA on 575V.

27/3641/

208 x x 240 x x 480 xxxx 600 x x x 208 x 240 x 480 x x x x 600 x x x x

54 72 90 108

RT-SVX34H-EN 9

Model Number Description

YCD 275 B C L A 0 A1 123 456 7 8 9 10 11 1213

50 Hz Description

Digits 1, 2 – Unit Function

TC = DX Cooling, No Heat TE = DX Cooling, Electric Heat YC = DX Cooling, Natural Gas Heat

Digit 3 – Unit Airflow Design

D = Downflow Supply and Return H = Horizontal Supply and Return F = Horizontal Supply and Upflow

Return

R = Downflow Supply and Horizontal

Return

Digits 4, 5, 6 – Nominal Cooling Capacity

275 = 22.9 Tons (82 kW) 305 = 25.4 Tons (89 kW) 350 = 29.2 Tons (105 kW) 400 = 33.3 Tons (120 kW) 500 = 41.7 Tons (148 kW)

Digit 7 – Major Development Sequence

B = R-410A Refrigerant

Digit 8 – Power Supply

C = 380/50/3 D = 415/50/3

Digit 9 – Heating Capacity

0 = No Heat (TC only) L = Low Heat (YC only) H = High Heat (YC only)

Note: When second digit is “E” for

Electric Heat, the following values apply in the ninth digit.

380V / 415V

A = 23 kW / 27 kW B = 34 kW / 40 kW C = 45 kW / 54 kW D = 56 kW / 67 kW E = 68 kW / 81 kW

Digit 10 – Design Sequence

A=First

Digit 11 – Exhaust6

0= None 1 = Barometric Relief (Available

w/Economizer only)

2 = 100% Power Exhaust Fan

(Available w/ Economizer only)

3 = 50% Power Exhaust Fan

(Available w/ Economizer only)

4 = 100% Fresh Air Tracking Power

Exhaust Fan (Available w/Economizer only)

5 = 50% Fresh Air Tracking Power

Exhaust Fan (Available w/ Economizer only)

6 = 100% Power Exhaust w/

Statitrac™

7 = 100% Fresh Air Tracking Power

8 = 50% Fresh Air Tracking Power

9 = 100% Power Exhaust w/ Ult ra Low

Exhaust Fan w/ Ultra Low Leak Exhaust Damper (Available w/ Economizer only)

Leak Exhaust Damper w/ Statitrac™

Digit 12 – Filter

A = 2” (51 MM) MERV 4, Std Eff, B = 2” (51 MM) MERV 8, High Eff, C = 4” (102 MM) MERV 8, High Eff, D = 4” (102 MM) MERV 14, High Eff,

Throwaway Filters Throwaway Filters Throwaway Filters Throwaway Filters

Digit 13 – Supply Fan Motor, HP

1 = 7.5 Hp (5.6 kW) 2 = 10 Hp (7.5 kW) 3=15 Hp (10 kW) 4 = 20 Hp (15 kW)

Digit 14 – Supply Air Fan Drive Selections

A = 458 RPM H = 417 RPM B = 500 RPM J = 437 RPM C = 541 RPM K = 479 RPM D = 583 RPM L = 521 RPM E = 625 RPM M = 562 RPM F = 658 RPM N = 604 RPM G = 664 RPM

Digit 15 – Fresh Air Selection

A=No Fresh Air B = 0-25% Manual Damper C = 0-100% Economizer, Dry Bulb

D = 0-100% Economizer, E = 0-100% Economizer, F = “C” Option and Low Leak G = “D” Option and Low Leak H = “E” Option and Low Leak J = “C” Option and Ultra Low Leak K = “D” Option and Ultra Low Leak L = “E” Option and Ultra Low Leak 1 = Option “C” with Traq

2 = Option “D” with Traq 3 = Option “E” with Traq 4 = Option “F” with Traq

Control Reference Enthalpy Control Differential Enthalpy Control Fresh Air Damper Fresh Air Damper Fresh Air Damper Outside Air Damper Outside Air Damper Outside Air Damper

5 = Option “G” with Traq 6 = Option “H” with Traq 7 = Option “C” with Traq w/ Ultra

8 = Option “D” with Traq w/ Ultra 9 = Option “E” with Traq w/ Ultra L ow

Low Leak Outside Air Damper

Leak Outside Air Damper

Digit 16 – System Control

1 = Constant Volume w/ Zone 2 = Constant V olume w/ Di scharge Air 4 = VAV Supply Air Temperature

5 = VAV Supply Air Temperature

6 = Single Zone VAV w/VFD w/o 7 = Single Zone VAV w/VFD w/ A = VAV Supply Air Temperature

B = VAV Supply Air Temperature

C = Single Zone VAV w/VFD w/o

D = Single Zone VAV w/VFD w/

Note: Zone sensors are not included

Temperature Control

Control

Control w/Variable Frequency

Drive w/o Bypass

Control w/Variable Frequency

Drive and Bypass

Bypass

Control w/VFD w/o Bypass w/

Motor Shaft Grounding Ring

Control w/VFD w/Bypass w/Motor

Shaft Grounding Ring

Bypass w/ Motor Shaft Grounding

Ring

Bypass w/Motor Shaft Grounding

Ring

with option and must be ordered

as a separate accessory.

Miscellaneous Options Digit 17

A = Service Valves

Note: Service valves cannot be selected

with High Efficiency units

(Digit 29 = K or L). Liquid and

discharge service valves are

included with High Efficiency

units.

Digit 18

B = Through the Base Electrical

Provision

Digit 19

C = Non-Fused Disconnect Switch

with External Handle

Digit 20

* = Unused Digit

Digit 21

* = Unused Digit

10 RT-SVX34H-EN

Model Number Description

Digit 22

F = Trane Communication Interface

(TCI)

Digit 23

G = Ventilation Override

Digit 24

H = Hinged Service Access

Digit 25

H = Tool-less Condenser Hail Guards J = Condenser Coil Guards

Digit 26

K = LCI (LonTalk) B = BACnet Communications

Interface (BCI)

Digit 27

0 = 5kA SCCR D = High Fault SCCR w/ Disconnect

Digit 28

0 = Pre-Painted Steel Drain Pan M = Stainless Steel Drain Pan 1 = Pre-Painted Steel Drain Pan w/

Condensate Overflow Switch

2 = Stainless Steel Drain Pan w/

Condensate Overflow Switch

Digit 29 — Condenser Coil Options

0 = Standard Efficiency

Condenser Coil

J = Corrosion Protected Condenser

Coil K = High efficiency unit (eStage) L = High efficiency unit (eStage) w/

Corrosion Protected Condenser

Coil

Digit 30-31 — Miscellaneous Options

P = Discharge Temperature Sensor R = Clogged Filter Switch

Digit 32 — Dehumidification Option

T = Modulating Hot Gas Reheat

Digit 33 — Human Interface

5 = Touchscreen Human Interface, 5"

29.2 ton (82-105 kW) units only and heaters B, C, D, E are used with 33.3-

41.7 ton (120-148 kW) units only.

5. The service digit for each model number contains 32 digits; all 32 digits must be referenced.

6. Ventilation override exhaust mode is not available for the exhaust fan with fresh air tracking power exhaust. VOM is available for the exhaust fan without fresh air tracking power exhaust.

Model Number Notes

1. All voltages are across-the-line starting only.

2. Option includes Liquid, Discharge, Suction Valves.

3. Supply air fan drives A thru G are used with 22.9-29.2 ton (82-105 kW) units only and drives H through N are used with 33.3 and 41.7 ton (120-148 kW) units only.

4. Electric Heat kW ratings are based upon voltage ratings of 380/415 V. Heaters A, B, C, D are used with 22.9-

RT-SVX34H-EN 11

General Information

Commonly Used Acronyms and Abbreviations

BAS = Building Automation System PSIG = Pounds Per Square Inch Gauge pressure CFM = Cubic Feet per Minute PHM = Phase monitor CLV = Cooling Valve (Reheat only) R/A = Return Air COMM = Module Designation for TCI/LCI RAH = Return Air Humidity CV = Constant Volume RAT = Return Air Temperature sensor CW = Clockwise RH = Right Hand CCW = Counterclockwise RHP = Reheat Pumpout Solenoid DSP = Direct Space Pressure control RHV = Reheat Valve DTS = Discharge Air Sensor RLP = Reheat Low Pressure Cutout DWU = Daytime Warm-up RPM = Revolutions Per Minute E/A = Exhaust Air RTAM = ReliaTel Air Handler Module ECA = Economizer Actuator RTDM = ReliaTel Dehumidification Module EET = Entering Evaporator Temperature Sensor RTVM = ReliaTel Ventilation Module F/A = Fresh Air RTOM = ReliaTel Options Module FDD = Fault Detection & Diagnostics RTRM = ReliaTel Refrigeration Module FFS = Fan Failure Switch S/A = Supply Air HI = Human Interface SCCR = Short Circuit Current Rating ICS = Integrated Comfort System (See BAS) SPC = Space Pressure Calibration Solenoid IDM = Indoor Fan Motor SPP = Space Pressure Transducer I/O = Input/Output SPT = Static Pressure Transducer

IOM =

LCI = LonTalk® Communication Interface TCI = Trane Communication Interface LCI-R = LonTalk Communication Interface with ReliaTel TCO = Temperature Cutout LH = Left Hand TD5 = 5" Touchscreen Display MAS = Mixed Air Sensor TDL = Temperature Discharge Limit MAT = Mixed Air Temperature VAV = Variable Air Volume MCHE = Microchannel VFD = Variable Frequency Drive MWU = Morning Warm Up VHR = Ventilation Heat Relay (VAV box relay) NSB = Night Setback (programmable ZSM BAYSENS119*) W.C. = Water Column O/A = Outside Air WCI = Wireless Comm Interface OAH = Outside Air Humidity XFSP = Exhaust Fan Setpoint OAT = Outside Air Temperature ZSM = Sensor, Zone Sensor, Zone Sensor Module, Zone Panel PGA = Power Exhaust Actuator

Installation, Operation and Maintenance manual (Ships with each unit)

SZVAV = Single Zone Variable Air Volume

About the Unit

Overall unit dimensional data is illustrated in Figure 1,

p. 14 to Figure 9, p. 18. Each package rooftop unit ships

fully assembled and charged with the proper refrigerant quantity from the factory. They are controlled by a microelectronic unit control processor . Several solid state modules are grouped to form the “Control System”. The number of modules within any given control system will be dependent upon the options and accessories ordered

Basic unit components include:

• Scroll compressors

• One (1) Intertwined Evaporator Coil

• One (1) Supply Fan

• Three (3) to Four (4) Condenser Fans

• Microchannel Condenser Coils

• Filters (type is dependent on opti on selection)

with the unit. Acronyms are used extensively throughout this manual when referring to the “Control System”.

12 RT-SVX34H-EN

Precautionary Measur es

WARNING

Fiberglass Wool!

Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or rep air will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation. You MUST wear all necessary Personal Protective Equipment (PPE) including gloves, eye protection, mask, long sleev es and pants when w orking with products containing fiberglass wool. Exposition to glass wool fibers without all necessary PPE equipment could result in cancer, respiratory, skin or eye irritation, which could result in death or serious injury.

- Avoid breathing fiberglass dust.

- Use a NIOSH approved dust/mist respirator.

- Avoid contact with the skin or eyes. Wear long-sleeved,

loose-fitting clothing, gloves, and eye protection.

- Wash clothes separately from other clothing: rinse

washer thoroughly.

- Operations such as sawing, blowi ng , tear-out, and

spraying may generate fiber concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respiration in these situations.

First Aid Measures

Eye Contact - Flush eyes with water to remove dust. If symptoms persist, seek medical attention.

Skin Contact - Wash af fected areas gently with soap and warm water after handling.

An optional roof curb, specifically designed for the V oyager commercial rooftop units is available from T rane. The roof curb kit must be field assembled and installed according to the latest edition of the curb installation guide.

Unit Inspection

As soon as the unit arrives at the job site:

• V erify that the nameplate data corresponds to the sales order and bill of lading (including electrical data).

• Visually inspect the exterior of the unit, including the roof, for physical signs of shipping damage.

• Check for material shor tages. Figure 11, p. 19 illustrates where “ship with” items are placed inside the unit.

If the job site inspection reveals damage or material shortages, file a claim with the carrier immediately . Specify the type and extent of the damage on the “bill of lading” before signing. Do not install a damaged unit without the Appropriate Trane sales representative's approval!

• Visually check the internal components for shipping damage as soon as possible after delivery and before it is stored. Do not walk on the sheet metal base pans.

General Information

WARNING

No Step Surface!

Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the supporting metal to collapse, resulting in the operator/technician to fall. Failure to follow this recommendation could result in death or serious injury.

Bridging between the unit's main supports may consist of multiple 2 by 12 boards or sheet metal grating.

• If concealed damage is discovered, notify the carrier's terminal office immediately by phone and by mail. Concealed damage must be reported within 15 days.

• Request an immediate joint inspection of the damage by the carrier and the consignee. Do not remove the damaged material from the receiving location. Take photos of the damage, if possible. The owner must provide reasonable evidence that the damage did not occur after delivery.

Storage

Take precautions to prevent condensate formation inside the unit electrical components and motors when:

a. The unit is stored before it is installed; or, b. The unit is set on the roof curb and temporary

auxiliary heat is provided in the building.

Isolate all side panel service entrances and base pan openings (e.g., conduit holes, S/A and R/A openings, and flue openings) to minimize ambient air from entering the unit until it is ready for startup.

Do not use the unit heater as temporary heat without completing the startup procedures detailed under

“Startup,” p. 40.

Trane will not assume responsibility for equipment damage resulting from accumulation of condensate on the unit electrical components.

RT-SVX34H-EN 13

Unit Dimensions and Weights

Recommended Clearances

Adequate clearance around and above each Voyager Commercial unit is required to ensure proper operation and to allow sufficient access for servicing.

If the unit installation is higher than the typical curb elevation, a field constructed catwalk around the unit is recommended to provide safe, easy access for maintenance and servicing. Table 1, p. 20 lists the recommended clearances for single and multiple unit installation. These clearances are necessary to assure adequate serviceability, cataloged capacities, and peak operating efficiency.

If the clearances available on the job site appear to be inadequate, review them with your Trane sales representative.

Roof Curb and Ductwork

The curbs for the 27.5 to 50 Ton commercial rooftop units enclose the entire unit base area. They are referred to as “full perimeter” type curbs.

Step-by-step instructions for the curb assembly and installation with curb dimensions and curb configuration for “A”, “B”, and “C” cabinets ship with each Trane accessory roof curb kit. (See the latest edition of the curb installation guide) Follow the instructions carefully to assure proper fit when the unit is set into place.

The S/A and R/A ductwork adjoining the roof curb must be fabricated and installed by the installing contractor b efore the unit is set into place. Trane curbs include flanges around the openings to accommodate duct attachment.

Ductwork installation recommendations are included in the instruction booklet that ships with each Trane accessory roof curb kit.

Note: For sound consideration, cut on ly the holes in the

roof deck for the supply and return duct penetration. Do Not remove the roof decking from the inside perimeter of the curb.

the unit into the ductwork. Refer to figures beginning on page 14 for the S/A and R/A opening dimensions.

All outdoor ductwork between the unit and the structure should be weather proofed after installation is completed.

If optional power exhaust is selected, an access door must be field-installed on the horizontal return ductwork to provide access to exhaust fan motors.

Figure 1. 60 Hz 27½-35, 50 Hz 23-29 Tons (TCD, TED,

YCD low heat)

If a Trane curb accessory kit is not used:

a. The ductwork can be attached directly to the S/A

and R/A openings. Be sure to use a flexible duct connector at the unit.

b. For “built-up” curbs supplied by others, gask ets

must be installed around the curb perimeter flange, Supply Air opening, and Return Air openings.

c. Insulation must be installed on the bottom of the

condenser section of the unit.

Horizontal Ductwork

When attaching the ductwork to a horizontal supply or horizontal return unit, provide a water tight flexible connector at the unit to prevent noise transmission from

14 RT-SVX34H-EN

Unit Dimensions and Weights

1 1/4 (32)

3 1/4 (81)

NOTES:

1. SEE DETAIL HOOD DRAWING FOR HORIZONTAL / DOWNFLOW UNITS FOR ADDITIONAL DIMENSION AND LOCATION.

179 3/4"

4565.65mm

42"

1066.8mm

83 13/16"

2128.8mm

90 1/16"

2287.5mm

180 5/16"

4579.9mm

90 3/8"

2295.5mm

5 3/8"

136.5mm

7 9/16"

192.1mm

3.25 [82.55mm] TO TOP OF FAN GRILLE

70 7/16"

1789.1mm

31.39"

797.3mm

6.91"

175.6mm

1 1/4" [31.7mm] FEMALE

PVC PIPE

3/4" [19.0mm] NPT GAS INLET

SEE NOTE 2

CUSTOMER CONNECTION POINT

Figure 2. Rear view showing duct openings for horizontal supply and return, 60 Hz 27½-35, 50 Hz 23-29 Tons (TCH,

TEH, YCH low heat)

Notes:

• For combination of horizontal and downflow openings

• On horizontal units, the VFD is located between the

supply and return ductwork, which makes access limited.

Figure 3. 60 Hz 27½-35 , 50 Hz 23-29 T o ns (TC, TE, YC low heat)

(digit 3 = F or R) see Figure 1, p. 14 for appropriate downflow/upflow dimensions and Figure 2, p. 15 for appropriate horizontal dimensions.

Note: Dimensions in ( ) are mm, 1”= 25.4 mm.

RT-SVX34H-EN 15

Unit Dimensions and Weights

1 1/4 (32)

3 1/4 (81)

Figure 4. 60 Hz 27½-35, 50 Hz 23-29 Tons (YD high heat)

191

Figure 5. Duct openings, 60 Hz 27½-35, 50 Hz 23-29 Tons (YH high heat)

Notes:

• On horizontal units, the VFD is located between the

supply and return ductwork, which makes access limited.

• For combination of horizont al and downflow openings (digit 3 = F or R) see Figure 4, p. 16 for appropriate downflow/upflow dimensions and Figure 5, p. 16 for appropriate horizontal dimensions.

16 RT-SVX34H-EN

Figure 6. 60 Hz 27½-35 , 50 Hz 23-29 Tons (YC high heat)

5270.5mm

207 1/2"

42"

5 3/8"

83 13/16"

2128.8mm

7 9/16"

208 1/16"

5284.7mm

90 5/8"

2301.8mm

90 1/16"

70 7/16"

31.39"

6.89"

PVC PIPE FEMALE

1" [25.4MM] NPT GAS INLET

NOTES:

1. SEE ROOFCURB DRAWING FOR DETAILS ON FIELD DUCT FITUP AND CONNECTIONS

2. SEE DETAIL HOOD DRAWING FOR HORIZONTAL / DOWNFLOW UNITS FOR ADDITIONAL DIMENSION AND LOCATION.

SEE NOTE 2

CUSTOMER CONNECTION POINT

1066.8mm

2287.5mm

136.5m

192.1m

3.25 [82.55mm] TO TOP OF FAN GRILLE

1789.1mm

797.3mm

175mm

1 1/4" [31.7mm]

Unit Dimensions and Weights

Note: Dimensions in ( ) are mm, 1”= 25.4 mm.

Figure 7. 60 Hz 40-50, 50 Hz 33-42 Tons (TD, TD, YD low and high heat)

RT-SVX34H-EN 17

Unit Dimensions and Weights

1 1/4 (32)

3 1/4 (81)

7 9/16"

232 3/8"

5902.3mm

232 3/4"

5911.8mm

90 5/8"

49 9/16"

1258.8mm

93 3/8"

2371.7mm

5 5/16"

90 1/16"

77"

1955.8mm

32.84"

834.2mm

4.66"

118.4mm

NOTES:

1. SEE ROOFCURB DRAWING FOR DETAILS ON FIELD DUCT FITUP AND CONNECTIONS

2. SEE DETAIL HOOD DRAWING FOR HORIZONTAL / DOWNFLOW UNITS FOR ADDITIONAL DIMENSION AND LOCATION.

SEE NOTE 2

CUSTOMER CONNECTION POINT

2301.8mm

PVC PIPE FEMALE

1" [25.4MM] NPT HIGH HEAT GAS INLET

2287.5mm

136.5m

192.1m

3.25 [82.55mm] TO TOP OF FAN GRILLE

1 1/4" [31.7mm]

3/4" [19MM] NPT LOW HEAT GAS INLET

Figure 8. Duct openings, 60 Hz 40-50, 50 Hz 33-42 Tons (TH, TH, YH low and high heat)

Notes:

• On horizontal units, the VFD is located between the

supply and return ductwork, which makes access limited.

• For combination of horizontal and downflow openings (digit 3 = F or R) see Figure 7, p. 17 for appropriate downflow/upflow dimensions and Figure 8, p. 18 for appropriate horizontal dimensions.

Figure 9. 60 Hz 40-50, 50 Hz 33-42 Tons (TC, TE, Y C low and high heat)

Note: Dimensions in ( ) are mm, 1”= 25.4 mm.

18 RT-SVX34H-EN

Figure 10. Fresh air and power exhaust dimensions for TC*, TE*, and YC* units

Figure 11. Location of “Ship With” items for TC*, TE*, and YC* units

Unit Dimensions and Weights

RT-SVX34H-EN 19

Unit Dimensions and Weights

Unit Rigging and Placement

WARNING

Heavy Objects!

Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables (chains or slings), hooks, and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift. Other lifting arrangements could cause equipment or property damage. Failure to follow instructions above or properly lift unit could result in unit dropping and possibly crushing operator/ technician which could result in death or serious injury.

Use spreader bars as shown in the diagram. Refer to the Installation manual or nameplate for un it weight. Refer to the Installation instructions located inside the control panel for further rigging information.

1. Verify that the roof curb has the proper gaskets installed and is level and square to assure an adequate curb-to-unit seal.

The units must be as level as possible in order to assure proper condensate flow out of the unit. The maximum side-to-side and end-to-end slope allowable in any application is listed in Table 2, p. 20.

Table 1. Minimum operating clearances installation

(horizontal, downflow, and mixed airflow configurations)

Recommended Clearances

Condenser

(a)

Coil

Single Unit

TC*, TE*, YC*

27.5 to 50 Tons

Multiple Unit

TC*, TE*, YC*

27.5 to 50 Tons

(a) Condenser coil is located at the end and side of the unit.

Economizer/ Exhaust End

6 Feet 8 Feet 4 Feet

Distance Between Units

Economizer/ Exhaust End End/Side

12 Feet 16 Feet 8 Feet

Orientation

End/Side

Service Side

Access

Service Side

Access

Table 2. Maximum slope

Cabinet

“A” (27.5 - 35 Ton Low Heat) 3 1/2 1 5/8 “B” (27.5 - 35 Ton High Heat) 4 1 5/8 “C” (All 40 and 50 Ton Units) 4 1/2 1 5/8

Note: Do not exceed these allowances. Correct the improper slope by

building up the curb base. The material used to raise the base must be adequate to support both the curb and the unit weight.

End to End

(inches)

Side to Side

(inches)

Figure 12. Unit rigging

Figure 13. Center of gravity

Z (see note 2)

Table 3. Center of gravity

Center-of-Gravity (inches)

YC Low Heat

Dimension

Unit Model

***330/275* 41 76 33 41 84 33 42 76 33 ***360/305* 43 77 33 43 85 33 44 77 33 ***420/350* 42 78 33 42 86 33 43 78 33 ***480/400* 42 111 35 42 111 35 42 111 35 ***600/500* 43 108 35 43 108 35 43 108 35

Note: Center-of-gravity dimensions are approximate, and are based on the

unit equipped with: standard efficiency coils, standard efficiency motors, economizer, and throwaway filters.

Note: Z dimension is upward from the base of the unit.

Example: Locating the center-of-gravity for a YC-360 MBH High Heat unit with 100%

exhaust. X = 43 inches inward from the control panel side Y = 85 inches inward from the compressor end Z = 33 inches upward from the base

XY ZXY ZXY Z

YC High Heat

Dimension

TC/TE

Dimension

20 RT-SVX34H-EN

Unit Dimensions and Weights

DE F

TOP VIEW OF UNIT

COMPRS

CBA

Table 4. Approximate units operating weights — lbs./kg

Basic Unit Weights

Unit Models

(60Hz/50Hz)

330/275 3720 / 1687 4150 / 1882 3590 / 1628 3610 / 1637.5 360/305 3795 / 1721 4225 / 1916 3665 / 1662 3685 / 1671.5 420/350 3876 / 1758 4306 / 1953 3746 / 1699 3766 / 1708 480/400 4825 / 2189 4950 / 2245 4565 / 2071 4600 / 2086.5 600/500 5077 / 2303 5202 / 2360 4827 / 2189.5 4852 / 2201

1. Basic unit weight includes minimum horsepo wer supply fan motor.

Table 5. Point loading average weight

Unit Models

(60Hz/50Hz) A B C D E F

330/275 852 / 386 695 / 315 754 / 342 740 / 335 602 / 273 504 / 228 360/305 878 / 398 681 / 309 750 / 340 713 / 323 577 / 262 622 / 282 420/350 841 / 381 842 / 382 669 / 303 735 / 333 582 / 264 634 / 287 480/400 835 / 378 869 / 394 950 / 431 748 / 339 769 / 349 776 / 352 600/500 882 / 400 931 / 422 954 / 433 740 / 336 844 / 382 847 / 384

Notes:

1. Point loading is identified with corner A being the corner with the compressors. As you move clockwise around the unit as viewed from the top, mid-point B, corner C, corner D, mid-point E and corner F.

2. Point load calculations provided are based on the unit weight for YC high heat gas models.

Low HeatYCHigh Heat TC TE

1,2

— lbs./kg

RT-SVX34H-EN 21

Unit Dimensions and Weights

Table 6. Approximate operating weights— optional components — lbs./kg

Var. Freq. Drives

0-25%

(VFD’s)

Unit Model

(60Hz/50Hz)

**(D,F)330/275 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(H,R)330/275 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(D,F)360/305 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(H,R)360/305 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(D,F)420/350 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(H,R)420/350 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**(D,F)480/400 110/50 165/74 50/23 290/131 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**(H,R)480/400 145/65 200/90 50/23 300/135 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**(D,F)600/500 110/50 165/74 50/23 290/131 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**(H,R)600/500 145/65 200/90 50/23 300/135 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

Baro.

Relief

Power

Exhaust

Man

Damper Econ.

Bypass Lo Hi

Valves

Serv

Thru-

the base Elec.

Fused

Discon.

Switch

Ultra

Tool-Less

Condenser

Unit Model

(60Hz/50Hz)

**(D,F)330/275 107/49 105/48 112/51 34 / 15 7 4 / 34 326/148

**(H,R)330/275 107/49 105/48 78/35 34 / 15 77 / 35 326/148

**(D,F)360/305 107/49 105/48 112/51 34 / 15 7 4 / 34 255/116

**(H,R)360/305 107/49 105/48 78 /35 34 / 15 77 / 35 255/116

**(D,F)420/350 107/49 105/48 112/51 34 / 15 7 4 / 34 173/78

**(H,R)420/350 107/49 105/48 78/35 34 / 15 77 / 35 173/78

**(D,F)480/400 112/51 130/59 114/52 34 / 15 7 4 / 34 241/109

**(H,R)480/400 112/51 130/59 100/45 34 / 15 84 / 38 241/109

**(D,F)600/500 112/51 130/59 114/52 34 / 15 74 / 34 -25/-11

**(H,R)600/500 112/51 130/59 100/45 34 / 15 84 / 38 -25/-11

Note: Basic unit weight includes minimum horsepower supply fan motor.

HGRH

Coil

Hail

Guards

Ultra

Low Leak Econ

Low Leak 50%

Exhaust

Ultra Low

Leak

100%

Exhaust

High

Efficiency

(eStage)

Non-

Factory

GFI

with

Discon.

Switch

Roof CurbW/O With

22 RT-SVX34H-EN

Installation General Requirements

Condensate Drain Connection

Each commercial rooftop unit is equipped with one (1) 11/4 inch Female PVC condensate drain connection.

Refer to Figure 11, p. 19 for the location of the connector. A condensate trap must be installed due to the drain connection being on the “negative pressure” side of the fan. Install a P-Trap at the unit using the guidelines in

Figure 14, p. 23.

Pitch the drain line at least 1/2 inch for every 10 feet of horizontal run to assure proper condensate flow.

Ensure that all condensate drain line installations comply with applicable building and waste disposal codes.

Notes:

• For units with optional Condensate Overflow Switch

(COF), the switch will not work properly if unit is not level or slightly sloped toward switch.

• To ensure proper condensate flow during operation the unit and the curb must be level.

Figure 14. Condensate trap installation

O/A Sensor & Tubing Installation

An Outside Air Pressure Sensor is shipped with all units designed to operate on traditional variable air volume applications (non-SZ VAV) and units with Statitrac™.

A duct pressure transducer and the outside air sensor is used to control the discharge duct static pressure to w ithin a customer -specified controlband. Refer to the illustration in Figure 16, p. 24 and the following steps to install the sensor and the pneumatic tubing.

1 . Remove the O/A pressure sensor kit located inside the

fan section. The kit contains the following items;

• an O/A static pressure sensor

• a sensor mounting bracket

• 50’ of 3/16” O.D. pneumatic tubing

• mounting hardware

2. Using two #10-32 x 1-3/4” screws provided, install the sensor's mounting bracket to the factory provided bracket (near the fan section).

3. Using the #10-32 x 1/2” screws provided, install the O/ A static pressure sensor vertically to the sensor bracket.

4. Remove the dust cap from the tubing connector located below the sensor in the vertical support.

5. Attach one end of the 50' x 3/16” O.D. factory provided pneumatic tubing to the sensor's top port, and the other end of the tubing to the connector in the vertical support. Discard any excess tubing.

Units with Statitrac™

1. Open the filter access door, and locate the Statitrac Transducer Assembly illustrated in Figure 17, p. 24. There are two tube connectors mounted on the left of the solenoid and transducers. Connect one end of the

Condensate Overflow Switch

This switch protects building from condensate overflow damage. It is factory-installed and tested.

Figure 15. Condensate overflow switch location

RT-SVX34H-EN 23

field provided 1/4” (length 50-100 ft.) or 3/8” (length greater than 100 ft.) O.D. pneumatic tubing for the space pressurization control to the fitting indicated in the illustration.

2. Route the opposite end of the tubing to a suitable location inside the building. This location should be the largest open area that will not be affected by sudden static pressure changes.

Installation General Requirements

CNO

Sensing Tube to Traq LO Side Pressure Port

Airow Transducer

Sensing Tube to Traq HI Side Pressure Port

Figure 16. Pressure tubing

Figure 17. Transducer assembly

Note: Statitrac and Traq transducer assembly shown.

24 RT-SVX34H-EN

Installation Electrical

Disconnect Switch External Handle (Factory Mounted Option)

Units ordered with the factory mounted disconnect switch come equipped with an externally mounted handle. This allows the operator to disconnect power from the unit without having to open the control panel door . The handle location and its three positions are shown below;

ON - Indicates that the disconnect switch is closed, allowing the main power supply to be applied at the unit.

OFF - Indicates that the disconnect switch is open, interrupting the main power supply at the unit.

OPEN COVER/RESET - Turning the handle to this position releases the handle from the disconnect sw itch, allowing the control panel door to be opened.

WARNING

Hazardous Voltage!

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

Once the door has been opened, it can be closed with the handle in any one of the three positions outlined above, provided it matches the disconnect switch position. The handle can be loc ked in the “OFF” position . While holding the handle in the “OFF” position, push the spring loaded thumb key, attac hed to the handle, into the base slot. Place the lock shackle between the handle and the thumb key. This will prevent it from springing out of position.

Figure 18. Disconnect switch

An overall layout of the field required power wiring is illustrated in Figure 19, p. 26. To insure that the unit supply power wiring is properly sized and installed, follow the guidelines outlined below.

Note: All field installed wiring must conform to NEC

guidelines as well as State and Local codes.

Ve rify that the power supply available is compatible with the unit's name plate ratings for all components. The available power supply must be within 10% of the rated voltage stamped on the nameplate. Use only copper conductors to connect the 3-phase power supply to the unit.

NOTICE:

Use Copper Conductors Only!

Unit terminals ar e not designed t o accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Main Power Wiring

WARNING

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, y ou MUST follo w requir ements 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.

1. Table 7, p. 27 to T a bl e 12, p. 29 list the electrical service sizing data. The electrical service must be protected from over current and short circuit conditions in accordance with NEC requirements. Protection devices must be sized according to the electrical data on the nameplate. Refer to “Electrical Wire Sizing and

Protection Device Equations” on page 29 for

determining: a. The appropriate electrical service wire size based

on “Minimum Circuit Ampacity” (MCA),

b. The “Maximum Over current Protection” (MOP)

device.

c. The “Recommended Dual Element fuse size” (RDE).

2. If the unit is not equipped with an optional factory installed Nonfused disconnect switc h, a field supplied disconnect switch must be installed at or near the unit in accordance with the National Electrical Code (NEC latest edition). Refer to DSS calculations

Wire Sizing and Protection Device Equations” on page 29 for determining correct size.

“Electrical

RT-SVX34H-EN 25

Installation Electrical

Location for the electrical service entrance is shown in the unit dimensional drawings beginning with

Figure 1, p. 14. Complete the unit's power wiring

connections onto either the main terminal bloc k HTB1, or the factory mounted nonfused disconnect switch inside the unit control panel.

Note: When the factory installed through-the-base

option is not used, the installing contractor is required to seal any ho les made in the base o f the unit to prevent water from leaking into the building.

3. Provide proper grounding for the unit in accordance with local and national codes.

Figure 19. Typical field power wiring

Through-the-Base Electrical (Optional Accessory)

Liquid-tight conduit couplings are secured to the base of the unit for both power and control wiring. Liquid-tight conduit must be field installed between the couplings and the unit control box to prevent water leaks into the building.

Note: If the unit is set on the roof curb and temporary

auxiliary heat is provided in the building, it is recommended that the electrical and control wiring conduit opening in the control box be temporarily sealed to provide a vapor barrier.

26 RT-SVX34H-EN

Installation Electrical

Table 7. 27½-50 ton electrical serv ice sizing data—60Hz

Fan Motors

Compressor - Std

Efficiency

Electrical

Characteri

Model

TC/TE/

YC*330

TC/TE/

YC*360

TC/TE/

YC*420

TC/TE/

YC*480

TC/TE/

YC*600

Notes:

1. All customer wiring and devices must be installed in accordance with local and national electrical codes.

2. 100% Power Exhaust is with or without Statitrac™.

stics

208/60/3 187-229

230/60/3 207-253

460/60/3 414-506

575/60/3 517-633

208/60/3 187-229 2/13 50.5

230/60/3 207-253 2/13 50.5

460/60/3 414-506 2/13 23.0

575/60/3 517-633 2/13 19.0

208/60/3 187-229

230/60/3 207-253

460/60/3 414-506

575/60/3 517-633

208/60/3 187-229

230/60/3 207-253

460/60/3 414-506

575/60/3 517-633

208/60/3 187-229

230/60/3 207-253

460/60/3 414-506

575/60/3 517-633

Allowable

Voltage

Range

No/ Ton

1/12,

1/13

1/12,

1/13

1/12,

1/13

1/12,

1/13

1/13,

1/15

1/13,

1/15

1/13,

1/15

1/13,

1/15

1/13,

1/20

1/13,

1/20

1/13,

1/20

1/13,

1/20

2/13,

1/15

2/13,

1/15

2/13,

1/15

2/13,

1/15

RLA

(Ea.)

44.0/

50.5

44.0/

50.5

21.0/

23.0

17.5/

19.0

50.5/

56.0

50.5/

56.0

23.0/

27.5

19.0/

23.0

50.5/

83.9

50.5/

83.9

23.0/

34.0

19.0/

27.3

50.5/

56.0

50.5/

56.0

23.0/

27.5

19.0/

23.0

(Ea.)

Compressor - High

Efficiency, eStage Supply Condenser Exhaust

LRA

No/

RLA

LRA

(Ea.) H P FLA No HP

203,

267

203,

267

203,

267

203,

267

203,

304

203,

304

98,

147

84,

122

203,

315

203,

315

98,

158

84,

136

267,

345

267,

345

142,

155

103,

126

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

15.0

7.5

10.0

15.0

7.5

10.0

15.0

7.5

10.0

15.0

10.0

15.0

10.0

15.0

10.0

15.0

10.0

15.0

10.0

15.0

20.0

10.0

15.0

20.0

10.0

15.0

20.0

10.0

15.0

20.0

28.0,

37.1

28.0,

37.1

14.1,

16.8

12.2,

14.7

28.0,

40.9

28.0,

40.9

14.1,

18.6

12.2,

15.4

28.0,

44.9

28.0,

44.9

14.1,

19.2

12.2,

16.6

31.1,

50.5

31.1,

50.5

14.1,

23.0

11.5,

19.0

40.9,

56.0

40.9,

56.0

18.6,

27.5

15.4,

23.0

98, 142

84, 103

98, 142

84, 103

22.2

29.5

18.8

25.2

9.4

12.6

7.8

10.1

22.2

29.5

18.8

25.2

9.4

12.6

7.8

10.1

22.2

29.5

40.7

18.8

25.2

35.4

9.4

12.6

17.7

7.8

10.1

15.1

29.5

40.7

25.2

35.4

12.6

17.7

10.1

15.1

29.5

40.7

56.1

25.2

35.4

49.4

12.6

17.7

24.7

10.1

15.1

19.6

304/

315

304/

315

147/

158

122/

136

315/

315

315/

315

158/

158

136/

136

315/

351

315/

351

158/

197

136/

146

315/

485

315/

485

158/

215

136/

175

315/

351

315/

351

158/

197

136/

146

Ton

1/6,

2/9

1/6,

2/9

1/6,

2/9

1/6,

2/9

1/6,

2/10

1/6,

2/10

1/6,

2/10

1/6,

2/10

1/6,

2/11

1/6,

2/11

1/6,

2/11

1/6,

2/11

1/8,

2/13

1/8,

2/13

1/8,

2/13

1/8,

2/13

1/10,

2/15

1/10,

2/15

1/10,

2/15

1/10,

2/15

(Ea.)

50%100

FLA

(Ea.)

31.17.0 1 2 1.0 4.1

31.13.5 1 2 1.0 1.8

31.12.8 1 2 1.0 1.4

31.17.0 1 2 1.0 4.1

31.13.5 1 2 1.0 1.8

31.12.8 1 2 1.0 1.4

31.17.0 1 2 1.0 4.1

31.13.5 1 2 1.0 1.8

31.12.8 1 2 1.0 1.4

41.17.0 1 2 1.5 5.4

41.13.5 1 2 1.5 2.7

41.12.8 1 2 1.5 2.2

41.17.0 1 2 1.5 5.4

41.13.5 1 2 1.5 2.7

41.12.8 1 2 1.5 2.2

FLA

(Ea.)No.

RT-SVX34H-EN 27

Installation Electrical

Table 8. Electrical service sizing data — electric heat

module (electric heat only) — 60 Hz

Models: TE(D,H,F,R) 330—600 Electric Heat FLA

KW Heater

Nominal

Unit Size

(Tons)

27½-35

40- 50

Note: All FLA in this table are based on heater operating at 208, 240, 480,

and 600 volts.

Nominal

36 54 72 90 108

Unit

Voltage

208 74.9 112.4 — — — 230 86.6 129.9 — — — 460 43.3 65.0 86.6 108.3 — 575 — 52.0 69.3 86.6 — 208 — 112.4 — — — 230 — 129.9 — — — 460 — 65.0 86.6 108.3 129.9 575 — 52.0 69.3 86.6 103.9

FLA FLA FLA FLA FLA

Table 9. Electrical service sizing data — crankcase

heaters (heating mode only) — 60Hz

Nominal

Unit Size (Tons)

27½ - 35 1111

40, 50 2211

200 230 460 575

Table 10. Electrical service sizing data — 50Hz

Compressor - Std

Efficiency

Compressor -

High Efficiency

Supply Condenser

Electrical

Model

TC/TE/YC*275 380-415/50/3

TC/TE/YC*305 380-415/50/3 2/11 23.0 158

TC/TE/YC*350 380-415/50/3

TC/TE/YC*400 380-415/50/3

TC/TE/YC*500 380-415/50/3

Notes:

1. All condenser fan motors are single phase.

2. All customer wiring and devices must be installed in accordance with local and national electrical codes.

3. Allowable voltage range for the 380V unit is 342-418V, allowable voltage range for the 415V unit is 373-456.

4. 100% Power Exhaust is with or without Statitrac

tics

Characteris

No/ Ton

1/10,

1/11

1/11,

1/12

1/11,

1/17

2/11,

1/12

RLA

(Ea.)

21.0/

23.0

23.0/

27.5

23.0/

34.0

23.0/

27.5

LRA

(Ea.)

147/

158

158/

197

158/

215

158/

197

No/ Ton

1/6,

2/9

1/6,

2/10

1/6,

2/11

1/8,

2/13

1/10,

2/15

RLA

(Ea.)

14.1,

16.8

14.1,

18.6

14.1,

19.2

14.1,

23.0

18.6,

27.5

LRA

(Ea.)

(kW) FLA No.HP(kW)

98,

7.5

(5.6)

(6.8)

7.5

(5.6)

(6.8)

7.5

(5.6)

(6.8)

(10.5)

(6.8)

(10.5)

(6.8)

(10.5)

(12.8)

13.6/

14.1

16.0/

15.5

13.6/

14.1

16.0/

15.5

13.6/

14.1

16.0/

15.5

24.0/

26.0

16.0/

15.5

24.0/

26.0

16.0/

15.5

24.0/

26.0

29.0/

28.0

142

98,

142

98,

147

98,

158

142,

155

Fan Motors

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

FLA Add Unit Voltage

FLA

50% 100%

Exhaust

(Ea.)

4.4 1 2

(kW)

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

1.0

(0.75)

1.0

(0.75)

FLA

(Ea.)No.

1.7

2.5

28 RT-SVX34H-EN

Table 11. Electrical service sizing data – electric heat

module (electric heat units only)—50Hz

Models: TE(D,H,F,R) 275 through 500 Electric Heat FLA

Nominal

Unit Size

(Tons)

23-29

33, 42

Note: All FLA in this table are based on heater operating at 380 or 415 volts

as shown above.

Nominal

Unit

Voltage

380 34.5 51.1 68.9 85.5 – 415 37.6 55.6 – – – 380 – 51.1 68.9 85.5 103.4 415 – 55.6 75.1 93.2 112.7

KW Heater (380/415V)

23/27 34/40 45/54 56/67 68/81

Table 12. Electrical service sizing data — crankcase

heaters (heating mode only) — 50Hz

FLA Add

Nominal Unit Size

(Tons)

23 - 29 1 1 33 - 42 1 1

Unit Voltage

380 415

Electrical Wire Sizing and Protection Device Equations

To correctly size the main power wiring based on MCA (Minimum Circuit Ampacity), use the appropriate equation listed below. Read the definitions that follow and then use Calculation #1 for determining MCA (Minimum Circuit Ampacity), MOP (Maximum Over current Protection), and RDE (Recommended Dual Element fuse size) for TC (Cooling Only) units and Y C (Cooling with Gas Heat) units. Use Calculation #2 for TE (Cooling with Electric Heat) units.

Load Definitions:

• LOAD 1 = CURRENT OF THE LARGEST MOTOR (Compressor or Fan Motor)

• LOAD 2 = SUM OF THE CURRENTS OF ALL REMAINING MOTORS

• LOAD 3 = FLA (Full Load Amps) OF THE ELECTRIC HEATER

• LOAD 4 = ANY OTHER LOAD RATED AT 1 AMP OR MORE

• CRANKCASE HEATERS FOR HEATING MODE ONLY:

• 208/230 VOLT

– 27.5 - 35 Ton Units, Add 1 Amp – 40 - 50 Ton Units, Add 2 Amps

• 460/575 VOLT

– 27.5 - 35 Tons Units, Add 1 Amp – 40 - 50 Ton Units, Add 1 Amp

Installation Electrical

Calculation #1 - TC*, YC*-27.5 to 50 Ton Units

MCA = (1.25 x Load 1) + Load 2 + Load 4 MOP = (2.25 x Load 1) + Load 2 + Load 4 (See Note 1) RDE = (1.5 x Load 1) + Load 2 + Load 4 (See Note 2) Calculation # 2 - TE*-27.5 to 50 Ton Units A. Single Source Power (all voltages) T o calculate the correct MCA (Minimum Circuit Ampacity),

MOP (Maximum Over current Protection), and RDE (Recommended Dual Element fuse size), two (2) sets of calculations must be performed;

1 . Calculate the M CA, MOP and/or RDE values using th e

above equation as if the unit is operating in the cooling mode.

2. Calculate the MCA, MOP and/or RDE values as if the unit is operating in the heating mode, as follows:

Note: When determining loads, the compressors and

condenser fan motors do not operate during the heating cycle.

Units with less than 50 KW Heaters

MCA = 1.25 x (Load 1 + Load 2 + Load 4) + (1.25 x Load 3)

Units with 50 KW or Larger Heaters

MCA = 1.25 x (Load 1 + Load 2 + Load 4) + Load 3 The MCA value stamped on the nameplate is the largest of

the two calculated values. MOP = (2.25 x Load 1) + Load 2 + Load 3 + Load 4 (See Note

The MOP value stamped on the nameplate is the largest of the two calculated values.

RDE = (1 .5 x Load 1) + Load 2 + Load 3 + Load 4 (See Note 2)

Note: Select an over current protection device equal to

the MOP value. If the calculated MOP value does not equal a standard size protection device listed in NEC 240-6, select the next lower over current protection device. If the calculated MOP value is less than the MCA value, select the lowest over current protection device whic h is equal to or larger than the MCA, providing the selected over current device does not exceed 800 amps.

Note: Select a Dual Element Fuse equal to the RDE value.

If the calculated RDE value does not equal a standard dual element fuse size listed in NEC 2406, select the next higher fuse size. If the calculated RDE value is greater than the MOP value, select a Dual Element fuse equal to the calculated MOP (Maximum Over current Protection) value

RT-SVX34H-EN 29

Installation Electrical

Disconnect Switch Sizing (DSS)

Calculation A. - YC*, TC*, and TE* Units:

DSS = 1.15 X (LOAD1 + LOAD2 + LOAD4) For TE* units, use calculations A and B.

Calculation B. - TE* Units:

DSS = 1 .15 X (LO AD3 + Supply Fan FLA + Exhaust

Fan FLA).

Use the larger value of calculations A or B to size the electrical disconnect switch.

Low Voltage Wiring

An overall layout of the var ious c ont rol opti ons avai lable for a Constant Volume application is illustrated in

Figure 20, p. 32 and Figure 21, p. 33 illustrates the various

control options for a V ariable Air Volume application. The required number of conductors for eac h control device are listed in the illustration.

A typical field connection diagram for the sensors and other options are shown in the following section “Remote Panels and Se nsors”. These diagrams are representative of standard applications and are provided for general reference only. Always refer to the wiring diagram that shipped with the unit for specific electrical schematic and connection information.

Note: All field wiring must conform to NEC guidelines as

well as state and local codes.

Control Power Transformer

WARNING

Hazardous Voltage!

The 24 volt control power transformers are equipped with internal circuit breakers. They are to be used only with the accessories called out in this manual. If a circuit breaker trips, be sure to turn off all power to the unit before attempting to reset it.

On units equipped with the VFD option, an additional control power transformer is used. The secondary is protected with fuses. Should the fuse blow, be sure to turn off all power to the unit before attempting to replace it.

Field Installed AC Control Wiring

WARNING

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, y ou MUST follo w requir ements 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.

NOTICE:

Use Copper Conductors Only!

Unit terminals ar e not designed t o accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Before installing any connecting wiring, refer to Table 13,

p. 30 for conductor sizing guidelines and;

• Use copper conductors unless otherwise specified.

• Ensure that the AC control voltage wiring between

the controls and the unit's termination point does not exceed three (3) ohms/conductor for the length of the run.

Note: Resistance in excess of 3 ohms per conduct or may

cause component failure due to insufficient AC voltage supply.

• Refer to dimensional information beginning with

Figure 1, p. 14 for the electrical access locations

provided on the unit.

• Do not run the AC low voltage wiring in the same

conduit with the high voltage power supply wiring.

Be sure to check all loads and conductors for grounds, shorts, and miswiring. After cor recting any discrepancies, reset the circuit breakers by pressing the black button located on the left side of the transformer.

Table 13. AC conductors

Distance from unit to control Recommended wire size

000-460 feet 18 gauge 461-732 feet 16 gauge 733-1000 feet 14 gauge

30 RT-SVX34H-EN

Installation Electrical

Field Installed DC Control Wiring

WARNING

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.

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.

Before installing the connecting wiring between the components utilizing a DC analog output/input sign al and the unit, refer to Table 14, p. 31 for conductor sizing guidelines and;

• Use standard copper conductor thermostat wire unless otherwise specified.

• Ensure that the wiring between the controls and the unit's termination point does not exceed two and a half (2-1/2) ohms/conductor for the length of the run.

Note: Resistance in excess of 21/2 ohms per conductor

can cause deviations in the accuracy of the controls.

• Refer to dimensional drawings beginning with

Figure 1, p. 14 for the electrical access locations

provided on the unit.

• Do not run the electrical wires transporting DC signals in or around conduit housing high voltage wires.

• Must not pass between buildings.

Table 14. DC conductors

Distance from unit to control Recommended wire size

000-150 feet 22 gauge 151-240 feet 20 gauge 241-385 feet 18 gauge 386-610 feet 16 gauge 611-970 feet 14 gauge

Units equipped with the Trane Communication Interface (TCI) option, which util izes a serial communication link;

• Must be 18 AWG shielded twisted p air cable Belden 8760 or equivalent).

• Must not exceed 5,000 feet maximum for each link.

RT-SVX34H-EN 31

Installation Electrical

Figure 20. Typical field wiring requirements for CV and SZ VAV control options

RTRM J7 Thermostat Inputs N/A for SZ VAV

LT B6

Space

Humidity

Sensor

Space

Humidistat

32 RT-SVX34H-EN

Figure 21. Typical field wiring requirements for traditional VAV control options

PROGRAMMABLE ZSM INPUTS CV/SZ VAV/VAV

CONVENTIONAL THERMOSTAT (CV ONLY)

MECHANICAL ZSM INPUTS

CONVENTIONAL THERMOSTAT INPUTS

Installation Electrical

LT B6

*VAV Mode input: RTRM J6-2 to RTRM J6-4 If the unit does not have a Mode (Off, Auto) input from another source, the following default applies: Short from J6-2 to J6-4 = AUTO mode, Open from J6-2 to J6-4 = OFF mode.

Figure 22. RTRM zone sensor/thermostat connections

Customer

Changeover for

VAV Htg (MOD

GAS ONLY

Space

Humidity

Sensor

Space

Humidistat

RT-SVX34H-EN 33

Installation Electrical

Remote Panels and Sensors

Constant Volume and Single Zone VAV Control Options

The RTRM must have a zone sensor or conventional thermostat (CV only) to operate the rooftop unit. If using a zone sensor, mode capability depends upon the type of sensor and/or remote panel selected to interface with the RTRM. The possibilities are: Fan selection ON or AUTO, System selection HEAT, COOL, AUTO, and OFF. Refer to

Figure 22, p. 33 for conventional thermostat connections

on Constant Volume units. The following controls are available from the factory for

field installation on Constant Volume or Single Zone VAV units.

WARNING

Hazardous Voltage!

Zone Panel (BAYSENS106*)

This electronic sensor features three system switch settings (Heat, Cool, and Off) and two fan settings (On and Auto). It is a manual changeover control with single setpoint capability.

Figure 23. Zone panel (BAYSENS106*)

Figure 24. Zone panel (BAYSENS108*)

Remote Panel W/O NSB (BAYSENS110*)

This electronic sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan settings (On and Auto) with four system status LED's. It is a manual or auto changeo ver control with dual setpoint capabili ty. It can be used with a remote zone temperature sensor BAYSENS077*.

Figure 25. Remote panel W/O NSB (BAYSENS110*)

Variable Air Volume (non-SZ VAV) Control Options

The RTRM must have a mode input in order to operate the rooftop unit. The normal mode selection used with a remote panel with or without night setback, or ICS is A UTO and OFF. Table 15, p. 35 lists the operating sequence should a CV/SZ VA V zone sensor be applied to a traditional VAV system having selectable modes; i.e. Fan selection ON or AUTO. System selection HEAT, COOL, AUTO, and OFF.

Default Mode Input for Discharge Air Control

Zone Panel (BAYSENS108*)

This electronic sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan settings (On and Auto). It is a manual or auto changeover control with dual setpoint capability. It can be used with a remote zone temperature sensor BAYSENS077*.

34 RT-SVX34H-EN

For unit stand-alone operation without a remote panel or an ICS connected, jumper between ter minals J6-2 and J6 4 on RTRM.

VHR Relay Output

For stand alone VA V unit operation, the VHR output should be wired to drive VA V b oxes to maximum position duri ng

Installation Electrical

Heat mode/unoccupied mode relay output to VAV

Note:

CUT RESISTOR R69 LOCATED ON RTAM NEAR SUPPLY AIR COOLING SETPOINT POTENTIOMETER WHEN OPTIONAL REMOTE PANEL IS USED.

CUT WIRE JUMPER ADJACENT TO THE TERMINAL 1 ON ZONE SENSOR WHEN OPTIONAL REMOTE SENSOR IS USED.

all heating modes and unoccupied periods. The VHR contacts are shown in the de-energized position and will switch (energize) during the above mentioned operating modes.

Figure 26. VHR relay output

Table 15. Variable air volume mode operation

System Mode Fan “Auto” Fan “On”

Heat

Cool VAV Cooling

Auto

Off Off4 Off4

Notes:

1. If Cooling is selected the supply fan will run continuously. If VAV Heating is activated the supply fan will run continuously.

2. If Daytime Warmup is Activated, the supply fan will run

continuously.

3. Auto changeover between Cooling and Daytime

Warmup depends upon the DWU initiate setpoint.

4. The fan will be Off any time the system selection switch

is “Off”.

DWU Active DWU Off

DWU

Off

DWU or

1,2,3,4

Cooling VAV Co oling

DWU2 VAV He ating

VAV Co oling DWU or

Cooling VAV Co oling or

Heating

1,2,3,4

Figure 27. Remote panel W/O NSB (BAYSENS021*)

The following Constant Volume or V ar iable Air Volume (Traditional or Single Zone) controls are available from the factory for field installation.

Remote Zone Sensor (BAYSENS073*)

This electronic sensor features remote zone sensing and timed override with over ride cancellation. It is used with a Trane Integrated Comfort system.

Figure 28. Remote zone sensor (BAYSENS073*)

building management

The following Variable Air Volume controls ar e available from the factory for field installation

Remote Zone Sensor (BAYSENS016*)

This bullet type temperature sensor can be used for; outside air (ambient) sensing, return air temperature sensing, supply air temperature sensing, remote temperature sensing (uncovered), and for VA V zone reset. Wiring procedures vary according to the particular application and equipment involved. Refer to the unit wiring diagrams, engineering bulletins, and/or any specific instructions for connections. See Table 10 for the Temp vs Resistance coefficient.

Remote Panel W/O NSB (BAYSENS021*)

This electronic sensor features two system switch settings (Auto and Off), four system status LED's with single setpoint capability. It can be used with a remote zone temperature sensor BAYSENS077*.

RT-SVX34H-EN 35

Remote Zone Sensor (BAYSENS074*)

This electronic sensor features single setpoint capability and timed override with override cancellation. It is used

with a T rane Integrated Comfort

building management

system.

Figure 29. Remote zone sensor (BAYSENS074*)

Installation Electrical

Twisted/Shielded Run Shield to terminal 11

RTRM

Remote Zone Sensor (BAYSENS077*)

This electronic sensor can be used with BAYSENS106*, 108*, 110*, 1 1 9*, or 021* Remote P anels. When this sensor is wired to a BA YSENS119* R emote Panel, wiring must be 18 AWG Shielded T wisted Pair (Belden 8760 or equivalent). Refer to the specific Remote P a nel for wirin g details.

Remote Panel with NSB (BAYSENS119*)

This 7 day programmable sensor features four periods for Occupied/Unoccupied programming per day. Either one or all four periods can be programmed. If the power is interrupted, the program is retained in permanent memory. If power is off longer than 2 hours, only the clock and day may have to be reset.

The front panel allows selection of Occupied/Unoccupied periods with two temperature inputs (Cooling Supply Air Temperature and Heating Warm-up temperature) per occupied period. The occupied supply air cooling setpoi nt ranges between 40º and 80º Fahrenheit. The warm-up setpoint ranges between 50º and 90º Fahrenheit with a 2 degrees deadband. The Unoccupied cooling setpoint ranges between 45º and 98º Fahrenheit. The unoccupied heating setpoint ranges between 43º and 96º Fahrenheit.

Note: In modulating gas heat units, the supply air heating

setpoint is the active setpoint with a BA YSENS1 1 9* and must be set for the heater to function properly. The modulating furnace will not react to the Discharge Heating Setpoint on the NSB.

The liquid crystal display (LCD) displays zone temperature, temperature setpoints, week day, time, and operational mode symbols.

The options menu is used to enable or disable these applicable functions:

Morning warm-up, economizer minimum position override during unoccupied status, heat installed, remote zone temperature sensor, 12/24 hour time display, and daytime warm-up. See Table 16, p. 37 for the Temp vs Resistance coefficient if an optional remote sensor is u sed.

During an occupied period, an auxiliary relay rated for 1.25 amps @ 30 volts AC with one set of single pole double throw contacts is activated.

High Temperature Sensor (BAYFRST003*)

Provides high limit “shutdown” of the unit. The sensor is used to detect high temperatures due to fire

in the air conditioning or ventilation ducts. The sensor is designed to mount directly to the sheet metal duct. Each kit contains two sensors. The return air duct sensor (X1310004001) is set to open at 135 degrees F. The supply air duct sensor (X1310004002) is set to open at 240 degrees F. The control can be reset after the temperature has been lowered approx imately 25 degrees F below the cutout setpoint.

Figure 31. High temperature sensor (BAYFRST003*)

Remote Minimum Position Potentiometer (BAYSTAT023*)

This device can be used with units with an econom iz er. It allows the operator to remotely set the position of the economizer dampers from 0% to 50% of fresh air entering the space.

Figure 32. Remote minimu m position potentiometer

(BAYSTAT023)

Figure 30. Remote sensor with night setback

BAYSENS119

36 RT-SVX34H-EN

Space Temperature Averaging

To RTRM J6-1 and J6-2 or to ZSM terminals 1 and 2 or NSB panel terminals S1 and S2. Shield to terminal 11

Space temperature averaging is accomplished by wiring a number of remote sensors in a series/parallel circuit.

The fewest number of sensors required to accomplish space temperature averaging is four. Example #1 illustrates two series circuits with two sensors in each circuit wired in parallel. Any number squared, is the number of remote sensors required. Example #2 illustrates three sensors squared in a series/parallel circuit. NSB panel remote sensors must use twisted/shielded cable.

Figure 33. Space temperature averaging

Installation Electrical

Table 16. Temperature vs. resistance (temperature vs.

resistance coefficient is negative)

Degrees F°Nominal

Resistance

-20° 170.1 K - Ohms 50° 19.96 K - Ohms

-15° 143.5 K - Ohms 55° 17.47 K - Ohms

-10° 121.4 K - Ohms 60° 15.33 K - Ohms

-5° 103.0 K - Ohms 65° 13.49 K - Ohms 0° 87.56 K - Ohms 70° 11.89 K - Ohms 5° 74.65 K - Ohms 75° 10.50 K - Ohms

10° 63.80 K - Ohms 80° 9.297 K - Ohms 15° 54.66 K - Ohms 85° 8.247 K - Ohms

20° 46.94 K - Ohms 90° 7.330 K - Ohms 25° 40.40 K - Ohms 95° 6.528 K - Ohms 30° 34.85 K - Ohms 100° 5.824 K - Ohms 35° 30.18 K - Ohms 40° 26.22 K - Ohms 45° 22.85 K - Ohms

RT-SVX34H-EN 37

Degrees

F°

Nominal

Resistance

Installation Piping

General Requirements

All internal gas piping for YC* rooftop units are factory installed and leak tested. Once the unit is set into place, a gas supply line must be field installed and connected to th e gas train located inside the gas heat compartment.

WARNING

Hazardous Gases and Flammable Vapors!

Exposure to hazardous gases fr om fuel substances have been shown to cause cancer, birth defects or other reproductive harm. Improper installati on, adjustment, alteration, service or use of this product could cause flammable mixtures or lead to excessive carbon monoxide. To avoid hazardous g ases an d flamm a bl e vapors f ol low proper installation and set up of this product and all warnings as provided in this manual. Failure to follow all instr u ctio ns could result in death or serious injury.

Access holes are provided on the unit as shown in

Figure 11, p. 19 to accommodate side panel entry.

Following the guidelines listed below will enhance both the installation and operation of the furnace.

Note: In the absence of local codes, the installation must

conform with the American National Standard Z223.1a of the National Fuel Gas Code, (latest edition).

1. To assure sufficient gas pressure at the unit, use

Table 18, p. 39 to determine the appropriate gas pipe

size for the heating capacity listed on the unit's nameplate.

If a gas line already exists, verify that it is sized large enough (Table 18, p. 39) to handle the additional furnace capacity.

2. Take all branc h piping from any main gas line from the top at 90 degrees or side at 45 degrees to prevent moisture from being drawn in with the gas.

3. Ensure that all piping connections are adequately coated with joint sealant and properly tightened. Use a piping compound that is resistant to liquid petroleum gases.

4. Provide a drip leg near the unit.

NOTICE:

Gas Valve Damage!

• Failure t o use a pr essure r egulating device will r esult in incorrect gas pressures. This can cause erratic operation due to gas pr essure fluct uations as well as damage to the gas valve.

• Oversizing the regulat or will cause irregular pulsating flame patterns, burner rumble, potential flame outages, as well as possible gas valve damage.

5. Install a pressure regulator at the unit that is adequa te to maintain 6" w.c. for natural gas and 11" w.c. for LP gas while the unit is operating in the “High Heat” mode. A minimum inlet gas pressure of 2.5" w.c. for natural gas and 8" w.c. for LP gas is required while operating in the “High Heat” mode.

Note: Gas pressure in excess of 14" w.c. or 0.5 psig will

damage the gas train.

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. It could result in an explosion. Use a leak test solution for leak testing. Failure to follow recommended safe leak test procedures could result in death or serious injury or equipment or property-only-damage.

6. Leak test the gas supply line using a soap-and-water solution or equivalent before connecting it to the gas train.

7. Pressure test the supply line before connecting it to the unit to prevent possible gas valve damage and the unsafe operating conditions that will result.

Note: Do not rely on gas train shutoff valves to isolate

the unit while conducting gas pressure/leak test. These valves are not designed to withstand pressures in excess of 14" w.c. or 0.5 psig.

Connecting the Gas Supply Line to the Furnace Gas Train

Follow the steps below to complete the installation between the supply gas line and the furnace. Refer to

Figure 34, p. 39 for the Gas Train configuration.

1 . Connect the supply gas piping using a “ground-joint”

type union to the furnace gas train and c hec k for leaks.

2. Provide adequate support for the field installed gas piping to avoid stressing the gas train and controls.

3. Adjust the inlet supply gas pressure to the recommended 6" for natural gas or 11" w.c. for LP gas.

Table 17. Specific gravity multiplier

Specific Gravity Multiplier

0.5 1.1

0.55 1.04

0.6 1

0.65 0.96

38 RT-SVX34H-EN

Table 18. Sizing natural gas pipe mains and branch es

Gas Input (Cubic Feet/Hour)*

Gas Supply Pipe Run (ft) 1-1/4” Pipe 1-1/2” Pipe 2" Pipe 2-1/2” Pipe 3"Pipe 4"Pipe

10 1050 1600 3050 4800 8500 17500 20 730 1100 2100 3300 5900 12000 30 590 890 1650 2700 4700 9700 40 500 760 1450 2300 4100 8300 50 440 670 1270 2000 3600 7400 60 400 610 1150 1850 3250 6800 70 370 560 1050 1700 3000 6200 80 350 530 990 1600 2800 5800 90 320 490 930 1500 2600 5400 100 305 460 870 1400 2500 5100 125 275 410 780 1250 2200 4500 150 250 380 710 1130 2000 4100 175 225 350 650 1050 1850 3800 200 210 320 610 980 1700 3500

Notes:

1. If more than one unit is served by the same main gas supply, consider the total gas input (cubic feet/hr.) and the total

length when determining the appropriate gas pipe size.

2. Obtain the Specific Gravity and BTU/Cu.Ft. from the gas company.

3. The following example demonstrates the considerations necessary when determining the actual pipe size.

Example: A 40' pipe run is needed to connect a unit with a 500 MBH furnace to a natural gas supply having a rating of 1,000

BTU/Cu.Ft. and a specific gravity of 0.60 Cu.Ft/Hour = Furnace MBH Input Gas BTU/Cu.Ft. X Multiplier Table 17, p. 38 Cu.Ft/Hour = 500 Table 18 indicates that a 1-1/4” pipe is required. *Table is based on a specific gravity of 0.60. Use Table 17, p. 38 or the specific gravity of the local gas supply.

Installation Piping

Figure 34. Gas train configuration for low heat units

(high heat units utilize two gas trains.)

RT-SVX34H-EN 39

Startup

Unit Control Modules

RTRM - ReliaTel™ Refrigeration Module

The RTRM is the main information receiving module. It interprets the information received from all other unit modules, sensors, remote panels, customer binary contacts and responds by activating the various unit components to satisfy the applicable request for economizing, cooling, heating, exhaust, ventilation. The RTRM configuration is set through the wire harness to function within one of six system applications:

1. Constant Volume Supply Air with No Heat.

2. Constant Volume Supply Air with Gas or Electric Heat.

3. Variable Supply Air Volume with No Heat.

4. Variable Supply Air Volume with Gas or Electric Heat.

5. Single Zone Variable Supply Air Volume with No Heat.

6. Single Zone Variable Supply Air Volume with Gas or Electric Heat.

ECA/RTEM - Economizer A ctuator/ReliaTel Economizer Module (Optional)

The ECA/RTEM monitors the mixed air temperature, return air temperature, minimum position setpoint (local or remote), ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity against ambient humidity) sensors, if selected, to control the dampers to an accuracy of +/- 5% of the stroke. The actuator is spring returned (FA closed, RA opened) any time power is lost to the unit. Refer to “Mec hanical Cooling

with an Economizer,” p. 56 for the proper potentiometer

settings for dry bulb/Enthalpy control.

Note: The ECA/RTEM control module is mounted on the

actuator. Units with the ultra-low -leak economizer option have their ECA control module mounted to a panel adjacent to the RA damper.

morning warm-up setpoint potentiometer, reset setpoint potentiometer , an d 5 DIP switches. (See Figure 35, p. 40.)

Figure 35. RTAM module

DIP Switches: Switch 1 is “ON” for VFD's. Switch 2 is “OFF” for VAV. Switch 3 and 4 operation are explained under “supply air

temperature reset”. Switch 5 is “OFF” for DWU Disabled and “ON” for DWU

Enabled.

EBA - Exhaust Blade Actuator (Optional)

If the unit is ordered with tracking power exhaust, the EBA will track the economizer damper position as long as the active exhaust fan setpoint has been exceeded - set via RTOM, through BAS, or calculated (SZ VAV only). The actuator limits the maximum travel of the exhaust barometric damper. The exhaust blade actuator is spring returned and is closed any time power is lost to the unit.

RTAM - ReliaTel Air Handler Module (Standard with Traditional VAV)

The RT AM receives information from the supply duct static pressure transducer. Attached to the module are the supply air heating potentiometer, supply air cooling setpoint potentiometer, supply pressure setpoint potentiometer, static pressure deadband potentiometer,

40 RT-SVX34H-EN

Startup

J8 J4 J9 J10

J11

J12

J7J5

J1 J2

DA COOL/FAN SPD

DA HEAT EXH

FAN

SA REHEAT

DEHUMID

TP4

TP5

R41

R130

R46

-1

TB2

TB1

R136

TP2

TP3

R42 R40

1 = Discharge Air Heat Setpoint** 2 = Exhaust Fan Enable Setpoint 3 = Supply Air Reheat Setpoint 4 = Dehumidication (%) Setpoint 5 = Discharge Air Cool Setpoint LL***

**Discharge Air Heat Setpoint is required for Single Zone VAV units with modulating heat or traditional Constant Volume units with modulating heat and a conventional thermostat control.

***Discharge Air Cool Setpoint is required for Single Zone VAV operation.

Figure 36. RTOM module

The RT AM module provides a 0 to 10 Vdc output to control the V ariable Frequency Drive. DIP switc hes located on the RTAM configures the unit to use the output for a VFD. Customer changeover input from Low Voltage Terminal Board (LTB5) activates VAV heating. The Supply Air Heating setpoint must be set to the desired disch arg e air temperature for heating. This VAV heating mode is available only with modulating gas heat units. In this mode the gas heaters modulate and the supply air pressure control remains active to satisfy the zone settings.

For constant volume (CV) units with modulating g as heat using a conventional thermostat or for Single Zone VAV units with modulating gas heat, the Discharge Air SP on the RTOM must be set to desired discharge air temperature in order for the unit to function properly . See

Figure 36, p. 41 For VAV units with modulating gas heat,

the Supply Air Heating Setpoint on the RTAM is used to control the heat setpoint in the ch angeover heating mode.

RT-SVX34H-EN 41

ReliaTel Ventilation Module (RTVM)

Figure 37. RTVM module

SPC PRESS DB SPC PRESS

R42

R136

TP2

DA COOL/FAN SPD

-1

1 = Space Pressure Deadband (iwc) 2 = Space Pressure Setpoint (iwc) 3* = R130 = Design minimum OA ow Setpoint 4* = R41 =DCV Minimum OA ow Setpoint

3** = R130 (SA REHEAT SP) = Design Minimum Position at Minimum Fan Speed Command 4** = R41 (DEHUMID) = DCV Minimum Position at Minimum Fan Speed Command 5** = R136 (DA COOL/FAN SPD) = Design Minimum Position at 50% Fan Speed Command

* Setpoints for units with TRAQ ** Setpoints only required for Single Zone VAV units with Demand Controlled Ventilation installed.

The RTVM (Ventilation Module) provides a 2 to 10 Vdc signal to control the Exhaust Blade Actuator in order to relieve positive building pressure. The signal output will be modulated based on the measured values from the Space Pressure Transducer. The Space Pressure Calibration Solenoid will ensure that the RTVM reads a differential pressure between the building pressure and atmospheric pressure. The Space Pressure Setpoint and Space Pressure Deadband are set by adjusting potentiometers located on the RTVM. Also, units configured for Single Zone VAV control with Demand Controlled ventilation will require an RTVM for the additional, required Outside Air damper minimum position setpoint potentiometers.

Units configured with the Fresh Air Measurement (Traq) option will require a RTVM for required sensors and setpoints to perform Traq airflow control. The Airflow Sensor input, Minimum Outside Air CFM Setpoints (Design and DCV), and Outside Airflow Adjustment Setpoint are all provided by the RTVM. The RTVM takes the airflow sensor voltage, converts it to airflow (CFM) and calculates a T raq outside air minimum OA damper position

R40

TP3

-1

1 1

TP4

SA REHEAT

J11

J12

R41

R130

TP5

DEHUMID

TB1

TB2

R46

Startup



RTDM

to maintain the desired adjustable CFM setpoint value. The airflow can be adjusted for altitude differences with the Outside Airflow Adjustment Setpoint.

ReliaTel Dehumidification Module (RTDM)

Figure 38. RTDM module

The RTDM provides a pulsed signal output to control the Cooling and Reheat Modulating Valves. The RTDM will also monitor the Entering Evaporator Temperature as well as protect against a l ow refrigerant pressure in the reheat circuit.

Conventional Thermostat Connections (Available Only with CV)

This feature allows conventional thermostats to be used in conjunction with the RTRM on Constant Volume Applications only. It utilizes the conventional wiring scheme of R, Y1, Y2, W1, W2/X, and G. Refer to Figure 22,

p. 33 for conventional thermostat connections. Applicable

thermostats to be used with the conventional thermostat inputs are:

Table 19. Thermostats

Vendor Part # Trane Part #

Honeywell T7300 Honeywell T874D1082 BAYSTAT011 Enerstat MS-1N BAYSTAT003

LCI - LonTalk® Communication Interface (Optional)

This module is used when the application calls for a LonTalk building management type control system. It allows the control and monitoring of the system through a T rane T racer Summit panel or 3rd party LonTalk system. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installation instructions that ship with each kit when field in stallation is necessary.

BCI - BACnet® Communication Interface (Optional)

This module is used when the application calls for a BACnet building management type control system. It allows the control and monitoring of the system through a Trane Tracer SC panel or 3rd par ty BA Cnet system. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installations ins tru ctions that ship with each kit when field installation is necessary .

Trane Wireless Comm Interface (WCI)

The T rane® Wireless Comm Int erface (WCI) is the perfect alternative to Trane’s BACnet™ wired communication links (for example, Comm links between a Tracer™ SC and a Tracer UC400). Minimizing communication wire used between terminal products, zone sensors, and system controllers has substantial benefits. Installation time and associated risks are reduced. Projects are completed with fewer disruptions. Future re-configurations, expansions, and upgrades are easier and more cost effective.

TD5 Display - 5" Touchscreen Display

The T racer TD5 display is an optional displ ay module that operates in conjunction with the ReliaTel Controller and allows you to view data and make operational changes. More information on the Tracer TD5 Display can be found in Installation, Operation, and Maintenance Manual, RTSVX49*-EN.

TCI - Trane Communication Interface (Optional)

This module is used when the application calls for an ICS building management type control system. It allows the control and monitoring of the system through a Trane Tracer™ panel. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installation instructions that ship with each kit when field installation is necessary.

42 RT-SVX34H-EN

Startup

System Operation

Economizer Operation with a Conventional Thermostat (CV Only)

If the ambient conditions are suitable for economizer operation, the economizer is activated as the 1st step of cooling from Y1. The dampers are controlled to provide a supply air temperature of 50° F +/- 5° F. If the economizer is disabled due to ambient conditions, the 1st stage of mechanical cooling is activated.

While economizing, if an additional stage of cooling is activated from Y2, the 1st stage of mechanical cooling is activated. If the economizer is disabled due to ambient conditions, the 2nd stage of mechanical cooling is activated.

The supply fan is activated from the G terminal and will cycle with a call for heat or cooling if in the “Auto” mode. It will run continuously in the “On” mode regardless of any other system demand.

On gas heat units, first and second stages are activated by the W1 and W2 terminals on the CTI. On electric heat units, only two stages of heat are available. If the W2 terminal is activated without activating the W1 terminal, the RTRM will bring on both stages of electric heat.

The Conventional Thermostat connections can also be utilized as a generic building automation system interface for constant volume ICS applications. Due to the limited heating and cooling steps when using a conventional thermostat, compressor staging will vary on units with three compressors.

Note: If a conventional thermostat is used with a unit that

has modulating gas heat, the unit will control to the Discharge Air SP potentiometer on the RTOM when heating with a W1 call only . The unit will go to high fire with W1 + W2.

Microelectronic Control Features

1. Anti short cycle timer (ASCT) function. Compressor operation is programmed for 3 minutes of minim um “ON” time, and 3 minutes of minimum “OFF” time. Enhances compressor reliability, and ensures proper oil return.

Note: Compressor cycle rate minimization, extends

compressor life expectancy. Minimizes damaging compressor inrush current, and guards against short cycling.

2. Delay between stages timer function. When combined with a standard Zone Sensor Module, the Reliatel Refrigeration Module (RTRM) provides a 10 second minimum “ON” delay for compressor staging.

3. Built in Fan Delay Relay function for Constant Volume and Single Zone VA V units. When the fan mode switch on the Zone Sensor Module is set in the auto position, the RTRM provides individual supply fan timing

sequences for each system in heating and cooling. The RTRM provides different timing sequences for Gas Heat units and Cooling only units.

4. Low ambient cooling to 0°F with Frostat™.

5. Built in electric heat staging, provides a 10 second “ON” delay between resistance heat stages.

6. Economizer preferred cooling allows fully integrated economizer operation with mechanical cooling if actually needed.

On Constant Volume and Single Zone VAV applications, a 3 minute delay allows the RTRM to evaluate the rate of change in the zone. If the zone temperature is dropping faster than acceptable parameters, the compressor(s) will not be required to operate.

7. Free night setback allows the unit to enter an unoccupied mode by simply shor ting across terminals RTRM J6-11 and J6-12. The short can be achieved by a set of dry contacts or a time clock. Once this shor t has been made the unit will close the economizer dampers, go from continuous fan to auto fan operation, and:

CV or SZ VAV Unit w/Mechanical ZSM

If the unit has a valid cooling and heating setpoint, the setup/setback is a minimum of 7°F.

If the unit does not have both setpoints, the setup/ setback is 0°.

If the unit has neither setpoint, the unoccupied cooling/ heating setpoints will be 74°F/71°F.

If the unit is configured as a Constant V olume unit and a conventional thermostat is used, this inpu t is ignored and the unit will respond to thermostat requests as during normal occupied mode.

VA V unit w/o ICS or NSB energizes heating if the space temperature drops to 10°F below the MWU setpoint but not less than 50°F

This option can not be used with programmabl e ZSM or with an ICSTM system.

8. Low pressure cutouts on all compressors have been added to insure compressor reliability in low refrigerant flow situations. The compressor(s) will lockout after four consecutive low pressure control trips during the compressor minimum 3 minute “on” time. The lockout will have to be manual reset as explained in this document.

RT-SVX34H-EN 43

Startup

Economizer Operation with CV Controls

The control point for the economizer is designed to control at least 1 .5°F below the cooling setpoint or 1 . 5°F above the heating setpoint, whichever produces the highest economizer control setpoint.

Example: Heating Setpoint = 68°F Cooling Setpoint = 70°F The control temperature for the economizer will be 1.5°F

above the heating setpoint due to it producing the least amount of offset.

Heating Setpoint = 55°F Cooling Setpoint = 75°F Because of the spread between the heating and cooling

setpoints, the control will choose to control the economizer at an offset temperature of 1.5°F below the cooling setpoint. This will be the highest resulting control setpoint temperature while maintaining the least amount of offset.

The percentage that the economizer dampers open is based on two factors:

1 . The zone temperature minus the economizer setpoi nt,

and,

2. The zone temperature minus the outdoor air temperature.

Note: Table 20 lists the percentages the dampers will

open based on these conditions.

Table 20. Percent of damper travel

Zone Temp - Econ Setpoint °F

Zone - ODT

0 - 7 F 0% 3% 9% 30% 90% 100% 7 - 14 F 0% 2% 6% 20% 60% 100% > 14 F 0% 1% 3% 10% 30% 100%

While economizing, if the supply air temperature falls below 50°F, the damper will not be allowed to open any further until the supply air temperature rises above 50°F. If the supply air temperature falls below 45°F, the dampers will be driven to minimum position and held there until the supply air temperature rises above 50°F.

The mechanical cooling is disab led whi le in an economizing state until two conditions are met:

1. The economizer dampers have been fully open for three minutes, and;

2. The calculated rate of change in the zone temperature is less than 12°F per hour.

If the economizer is disabled due to u nsuitable conditions, the economizer is at the selected minimum position when the supply fan is “On”, and is closed when the supply fan

0.0-0.5 0.5-1.0 1.0-2.0 2.0-3.0 3.0-5.0 >5.0

is “Off”. The mechanical cooling will cycle as though the unit had no economizer.

Modulating Power Exhaust

If the unit is equipped with the modulating power exhaust option, the power exhaust actuator will follow the position of the economizer actuator.

Mechanical Cooling without an Economizer (CV and SZ VAV)

Mechanical cooling is used to maintain the zone temperature. The RTRM is designed to limit the compressor cycle rates to within 10 cycles per hour based on the minimum compressor “on” and “off” times.

It stages the mechanical cooling to control the zone temperature to within +/- 2°F of the sensor setpoint at the sensed location. Table 21 lists the compressor staging sequence for standard efficiency units.

For high efficiency units there are three separate staging sequences which determ ine the staging of 3 compressors within each sequ ence. Each call for cool will operate w ithin a given sequence and the next call for cool will operate in the next sequence. Lead/Lag operation is taken into consideration with these 3 staging sequences and will be active when Lead/Lag is configured. Table 22 lists the compressor staging sequence for high efficiency units.

Table 21. Compressor staging with lead/lag disabled -

std efficiency units

“ON” “OFF”

Unit Model Step 1 Step 2 Step 3 Step 3 Step 2 Step 1

CPR 1

1 2

27.5 - 35 CPR 11CPR 1, 2 N/A N/A CPR 1, 2 CPR 1 40 CPR 12CPR 23CPR 1, 2 CPR 1, 2 CPR 23CPR 1

CPR

50 CPR 1

Notes:

1. Single circuit, dual manifolded compressors

2. Number one refrigeration circuit, Standalone compressor, is “On”.

3. First stage is off. Number two refrigeration circuit, standalone

compressor, is “On”

4. First Stage is “Off”, Number two refrigeration circuit, manifolded compressor pair operating simultaneously, is “On”.

2,3

CPR 1,

2, 3

CPR 1, 2, 3

CPR 2,

44 RT-SVX34H-EN

Startup

T able 22. Compressor staging sequence - high efficiency

units

Sequence 1 Sequence 2

Stage CPR 1CPR 2CPR 3 Stage CPR 1CPR 2CPR 3

1 ON OFF OFF 1 Start at Stage 2 2 OFF ON OFF 2 OFF ON OFF 3 ONONOFF 3 ONONOFF 4 OFF ON ON 4 OFF ON ON 5 ON ON ON 5 ON ON ON

Sequence 3

Stage CPR 1 CPR2 CPR3

1 Start at Stage 2 2OFFOFFON 3ONOFFON 4 OFF ON ON 5 ONONON

Figure 39. Compressors

Zone Temperature - Occupied Cooling (CV and SZ VAV)

When the unit is in the cooling mode and the zone temperature raises above the cooling setpoint control band, the economizer and the compressor stages will be cycled as required by the zone sensor, remote panel, or Tracer®. For SZ VAV control, the fan capacity will also be controlled in order to meet the zone cooling demand.

Zone Temperature - Occupied Heating (CV and SZ VAV)

When the unit is in the heating mode and the zone temperature falls below the heating setpoint control band, the necessary stages of heat will cycle to raise the temperature to within the setpoint control band. For SZ VAV, the fan capacity will also be controlled in order to meet the zone heating demand.

Supply Fan (CV and SZ VAV)

When the Fan Selection S witch is in the “AUTO” position and a call for cooling is initiated, the supply fan w ill delay starting for approximately one second on traditional CV units. For SZ VAV units, the supply fan will be controlled ON based on the zone cooling demand. Once ON, the unit will begin staging cooling capacity (economizer and/or compressors) in order to meet the discharge air requirements. Once the zone has been satisfied, the supply fan will be controlled OFF. When the Fan Selection Switch is in the “ON” position, the supply fan will run continuously. If airflow through the unit is not proven by the differential pressure switch (factory setpoint 0.15 “w.c.) within 40 seconds nominally , the RTRM will shut off all mechanical operations, lock the system out, send a diagnostic to ICS, and the SERVICE LE D output will pulse. The system will remain loc ked out until a reset is initiated either manually or through ICS or a mode transition from OFF to a non-OFF mode.

Supply Air Tempering (CV and SZ VAV)

CV Units with Staged Heat

This function allows the supply air te mperature to be maintained within a low limit parameter during minimum ventilation periods. For CV units configured with a Staged Heat design (Electric or Gas) and Supply Air Tempering operation enabled, if the following items are true, the unit will enter Supply Air Tempering mode:

1. The supply fan is ON.

2. The unit is in Occupied mode.

3. Zone Temp. is less than the active Cooling setpoint.

4. The unit is in Heat mode but is not actively heating OR

5. The unit is in AUTO-COOL mode but not actively

cooling and cooling capacity has been OFF for 5 minutes.

Once the above conditions are met, if the supply air temperature drops to 10°F BELOW the Occupied Heating Zone Temperature Setpoint, the SA Tempering function will bring ON one stage of gas or electric heat.

Once SA T e mpering is active, heating will be turned OFF if the Supply Air T emperature rises to 10°F ABOVE the Active Occupied Zone Heating Setpoint, or the Zone T emp erature rises to the Active Zone Cooling Setpoint. Also, if the Zone Heat Control function is calling for 1 or more stages of Heat, Tempering will be discontinued and the unit will stage additional heating to meet the current demand.

When an economizer is installed, air tempering is allowed with ICSTM when the fan system switch is in the “ON” position with no call for heating. The same conditions must be met as described above for entering and leaving Tempering operation.

RT-SVX34H-EN 45

Startup

CV Units with Modulating Heat

On units with Modulating Gas Heat, Supply Air T empering is inherent to the Modulating Heat design and does not require any additional configuration/enabling. Modulating Heat Tempering is accomplished by allowing the unit to return to heating if the Zone is marginally satisfied and the Supply Air temperature begins to fall. The following conditions must be true to enable the unit to perform “Tempering”:

1. The supply fan is ON.

2. The unit is in Occupied mode.

3. Zone Temp. is less than the active Cooling setpoint.

4. The unit is in Heat mode but is not actively heating OR

5. The unit is in AUTO-COOL mode but not actively cooling and cooling capacity has been OFF for 5 minutes.

Once the above conditions are met, and the supply air temperature drops below the ZHSP - 10°F, the unit will transition back into active heating operation and will begin to control the modulating heat output to maintain the supply air temperature.

Once the unit has entered into Tempering mode, the unit will leave active heating either by normal heat termination as determined by the heating control algorithm or when the Zone Temperature reaches the active ZCSP.

SZ VAV Units with Staged Heat

For SZ VAV units configured with a Staged Heating type, the Supply Air T empering function will operate as on a CV unit with Staged Heat.

SZ VAV Units with Modulating Heat

For units configured with a Modulating Heat type, “Tempering” is an extension of normal Heating control which allows a transition from inactive “Auto-Cool” mode to Heating based on supply air temperature i f the Zone Temperature is in control. The following conditions must be true to allow the unit to enter Supply Air Tempering:

1. Supply Fan is ON.

2. The unit is in Occupied mode.

3. The unit is operating in Auto-Cool Mode.

4. Cooling has been inactive for 5 minutes.

When the above conditions are true, Tempering will be allowed when the Supply Air T emperature falls below the user selectable Minimum Supply Air Cooling Setpoint (minus deadband) as long as the Zone Temperature is < ZCSP - 1°F. Once the unit transitions into “T empering” the unit will transition to normal heating control and will control the supply air temperat ure between the minimum and maximum supply air setpoints.

If the Zone Temperature rises above the ZCSP during “Tempering” the unit will de-energize Heating and “Tempering” will be disabled until conditions allow for it

again. Normal Auto-Changeover requirements will be in control to allow the unit to transition into Active Cool mode.

Variable Air Volume Applications (Single Zone VAV)

Supply Fan Output Control

Units configured for Single Zone VAV will include a VFD controlled supply fan motor which will be controlled via the 0-10Vdc Indoor Fan Speed output located on the RTOM and the RTRM Supply Fan output. With the R TRM Supply Fan output energized and the RTOM Indoor Fan Speed output at 0Vdc the fan speed output is 33% (20Hz) for cooling mode and 58% (35Hz) for heating modes from the VFD motor and at 10Vdc the fan speed output is 100% (60Hz). The control will scale the 0-1 0Vdc output from the RT OM linearl y to cont rol to 38%-100% controllable range based on the space heating or cooling demand.

Minimum Supply Fan Output

Refer to the table below for details on minimum supply fan output signals associated with each unit function. Note that each value represents the actual Fan Output %.

Table 23. Fan output - standard efficiency

Function Minimum Fan Output %

Ventilation Only 58% Economizer Cooling 58%

Cool 1 (C1 Energized) 58% Cool 2 (C1 or C2) 67% Cool 3 (C1 + C2 Energized) 67% SZVAV Modulating Heat 58% CV Staged Heat 100% SZVAV Modulating Heat Tempering 58% CV Staged Heat Tempering 100% Modulating Reheat 80%

Tabl e 24. Fan output - high efficiency

Function Minimum Fan Output %

Ventilation Only 45% Economizer Cooling 45% Cool 1 45% Cool 2 58% Cool 3 67% Cool 4 75% Cool 5 75% SZVAV Modulating Heat 58% CV Staged Heat 100%

46 RT-SVX34H-EN

Startup

Table 24. Fan output - high efficiency

SZVAV Modulating Heat Tempering 58% CV Staged Heat Tempering 100% Modulating Reheat 80%

Supply Fan Mode Operation

Units configured for Single Zone VAV control will utilize Supply Fan Mode selection as is currently implemented into ReliaTel controls for normal Zone Control and will be selectable between AUTO and ON via a connected Zone Sensor module or through BAS/Network controllers.

Supply Fan Mode Auto Operation

For active Cooling, Heating, and Dehumidification operation the Supply Fan will be commanded ON and will ramp up to the appropriate minimum speed once the unit determines that there is a request for capacity control. Once the active request is cleared and all capacity is deenergized normal supply fan of f delays as implemented on constant volume units will be in ef fect. During th e Supply Fan Off-Delay , the supply fan will remain energize d for the predetermined time at the previous unit function's minimum speed. All other cases which would bring the Supply Fan ON will function as on non-Single Zone VAV units.

Table 25. DA cool - fan SPD setpoint

Setpoint (°F) Voltage (Vdc) Setpoint (°F) Voltage (Vdc)

40 <0.1 56 1.7 41 0.2 57 1.75 42 0.3 58 1.83 43 0.45 59 1.9 44 0.55 60 1.95 45 0.7 61 2 46 0.8 62 2.05 47 0.95 63 2.1 48 1.05 64 2.13 49 1.15 65 2.17 50 1.25 66 2.21 51 1.3 67 2.27 52 1.35 68 2.3 53 1.45 69 2.35 54 1.55 70 >2.4 55 1.65

Supply Fan Mode ON Operation

For active unit control with the Supply Fan Mode set to ON, the unit will energize the Supply Fan and hold the Fan Speed output at minimum speed until there is a request for the fan speed to increase. This will hold true for all cases except during Unoccupied periods in which the Supply Fan Mode is forced to AUTO and will operate the Supply Fan as described above for all Cooling, Heating, and Dehumidification requests.

Setpoint Arbitration

Single Zone VAV units will require traditional Zone Heating (if Heat installed) and Cooling Setpoints that are used constant volume units in addition to two new setpoints: Discharge Air Cool (DA Cool - Fan SPD) and Discharge Air Heat (DA Heat) Setpoint limits. The Zone Heating and Cooling Setpoints will be selectable via the existing RTRM customer connections for a Zone Sensor panel and the DA Heat and Cool Setpoints will be customer selectable via two onboard potentiometers on the RT OM with ranges 50-150°F and 40-90°F respectively.

Table 26 and Table 25 below can be used as a reference

when setting the DA Heat (R42) and DA Cool - Fan SPD (R136) setpoints on the RTOM.

Note: The recommended settings for these setpoints is

100°F for the DA Heat Setpoint and 50°F for the DA Cool - Fan SPD Setpoint.

RT-SVX34H-EN 47

Startup

Table 26. DA heat setpoint

Volt-

(Vdc)

Set-

(ºF)

Volt-

(Vdc)

age

point

0.00 50 0.98 75 1.61 100 2.06 125

0.09 51 1.00 76 1.63 101 2.08 126

0.13 52 1.03 77 1.66 102 2.09 127

0.16 53 1.06 78 1.69 103 2.11 128

0.20 54 1.08 79 1.71 104 2.12 129

0.24 55 1.11 80 1.72 105 2.13 130

0.28 56 1.13 81 1.74 106 2.13 131

0.31 57 1.16 82 1.76 107 2.14 132

0.35 58 1.18 83 1.78 108 2.16 133

0.39 59 1.21 84 1.79 109 2.17 134

0.42 60 1.23 85 1.81 110 2.19 135

0.46 61 1.26 86 1.83 111 2.20 136

0.50 62 1.28 87 1.84 112 2.21 137

0.53 63 1.31 88 1.86 113 2.23 138

0.57 64 1.33 89 1.88 114 2.24 139

0.61 65 1.36 90 1.89 115 2.25 140

0.65 66 1.38 91 1.91 116 2.26 141

0.68 67 1.41 92 1.93 117 2.28 142

0.72 68 1.43 93 1.95 118 2.29 143

0.76 69 1.46 94 1.96 119 2.30 144

0.79 70 1.48 95 1.98 120 2.32 145

0.83 71 1.51 96 2.00 121 2.33 146

0.87 72 1.53 97 2.01 122 2.34 147

0.90 73 1.56 98 2.03 123 2.36 148

0.94 74 1.58 99 2.05 124 2.37 149

age

Set-

point

(ºF)

Volt-

age

(Vdc)

Set-

point

(ºF)

Volt-

age

(Vdc)

point

2.40 150

Set-

(ºF)

Note: The above potentiometer voltage readings can be

verified via the provided test points located next to each potentiometer . Use a DC voltmeter to the Vdc reading between those points and common.

Units Configured with the Outside Air Measurement (Traq) Option

To make a minor correction to the Traq airflow (CFM) reading that is calculated internally by the ReliaT el system, an adjustment pot is available on the RTVM. This pot can be used to correct for sta tic “local” factors such as altitude. Va riable factors such as drift, temperature, humidity, and other changing atmospheric conditions are corrected as part of the conversion calculation.

The adjustment will typically be made in Service Test mode in a step where the OA damper is being commanded to the T raq OA Minimum Position Request with all required Traq control inputs valid (i.e. sensors, setpoints, RTVM board). The OA flow adjustment setpoint potentiometer (R136) on the RTVM will be used to adjust the value up to a factor of +/- 20% (0.80 to 1 .20) Full co unter -cloc kwise will be – 20% and full clockwise will be + 20%. The potentiometer will be set to the middle position (between full CCW and full CW) in a “Deadband” area representing no adjustment 0% (factor of 1.00) by default. The adjustment will be applied linearly across the sensing range of the airflow sensor which may produce inaccuracies at airflow levels not close to the value at which the calibration adjustment was made.

Sequence for Setting Calibration:

1. If unit is configured with DCV disconnect CO2 sensor prior to powering unit. After calibration remove power from unit and reconnect CO

2. Adjust the Design Minimum OA Flow Setpoint potentiometer (R130/R41) on the RTVM to your desired flow rate for minimum ventilation (See Table 27).

3. Initiate Service Test and step to the Minimum Ventilation step. This will set the unit into a constant ID fan speed and OA damper request to minimum position. Minimum position will be from the Traq calculation to maintain the OA flow at the setpoint.

4. Allow the damper position to settle to the desired flow rate set by the setpoint.

5. Measure the OA flow rate via an air balancing instrument.

6. Adjust the OA flow adjustment setpoint potentiometer (R136) clockwise or counter-clockwise to “dial in” the flow to match the instrument in

sensor.

Step 4 (See Table 28).

48 RT-SVX34H-EN

Startup

Table 27. Design minimum OA flow setpoin t

Design Min OA

Flow

Setpoint

(R130) Airflow

CFM

1000 1000 0.20 4500 4500 0.90 1100 1100 0.22 4600 4600 0.92 1200 1200 0.24 4700 4700 0.94 1300 1300 0.26 4800 4800 0.96 1400 1400 0.28 4900 4900 0.98 1500 1500 0.30 5000 5000 1.00 1600 1600 0.32 5100 5100 1.01 1700 1700 0.34 5200 5200 1.02 1800 1800 0.36 5300 5300 1.03 1900 1900 0.38 5400 5400 1.04 2000 2000 0.40 5500 5500 1.05 2100 2100 0.42 5600 5600 1.06 2200 2200 0.44 5700 5700 1.07 2300 2300 0.46 5800 5800 1.08 2400 2400 0.48 5900 5900 1.09 2500 2500 0.50 6000 6000 1.10 2600 2600 0.52 6100 6100 1.11 2700 2700 0.54 6200 6200 1.12 2800 2800 0.56 6300 6300 1.13 2900 2900 0.58 6400 6400 1.15 3000 3000 0.60 6500 6500 1.17 3100 3100 0.62 6600 6600 1.18 3200 3200 0.64 6700 6700 1.19 3300 3300 0.66 6800 6800 1.20 3400 3400 0.68 6900 6900 1.22 3500 3500 0.70 7000 7000 1.23 3600 3600 0.72 7100 7100 1.24 3700 3700 0.74 7200 7200 1.25 3800 3800 0.76 7300 7300 1.26 3900 3900 0.78 7400 7400 1.27 4000 4000 0.80 7500 7500 1.28 4100 4100 0.82 7600 7600 1.29 4200 4200 0.84 7700 7700 1.30 4300 4300 0.86 7800 7800 1.31 4400 4400 0.88 7900 7900 1.32

DCV Min OA Flow

Setpoint

(R41)

Airflow

CFM

Voltage

Reading

Voltage

Vdc

Design Min OA

Flow

Setpoint

(R130)

Airflow

CFM

DCV Min OA Flow Setpoint

(R41)

Airflow

CFM

Voltage

Reading

Voltage

Vdc

Table 27. Design minimum OA flow setpoint

Design

Min OA

Flow

Setpoint

(R130) Airflow

CFM

8000 8000 1.34 11700 11700 1.78 8100 8100 1.36 11800 11800 1.79 8200 8200 1.38 11900 11900 1.80 8300 8300 1.39 12000 12000 1.81 8400 8400 1.40 12100 12100 1.82 8500 8500 1.41 12200 12200 1.83 8600 8600 1.42 12300 12300 1.84 8700 8700 1.43 12400 12400 1.85 8800 8800 1.44 12500 12500 1.86 8900 8900 1.45 12600 12600 1.87 9000 9000 1.46 12700 12700 1.88 9100 9100 1.47 12800 12800 1.89 9200 9200 1.48 12900 12900 1.89 9300 9300 1.50 13000 13000 1.89 9400 9400 1.52 13100 13100 1.90 9500 9500 1.53 13200 13200 1.91 9600 9600 1.54 13300 13300 1.92 9700 9700 1.55 13400 13400 1.93 9800 9800 1.57 13500 13500 1.94

9900 9900 1.58 13600 13600 1.95 10000 10000 1.59 13700 13700 1.96 10100 10100 1.60 13800 13800 1.97 10200 10200 1.61 13900 13900 1.98 10300 10300 1.63 14000 14000 1.99 10400 10400 1.65 14100 14100 2.00 10500 10500 1.67 14200 14200 2.01 10600 10600 1.68 14300 14300 2.02 10700 10700 1.69 14400 14400 2.03 10800 10800 1.70 14500 14500 2.04 10900 10900 1.71 14600 14600 2.05 11000 11000 1.72 14700 14700 2.06 11100 11100 1.73 14800 14800 2.07 11200 11200 1.74 14900 14900 2.08 11300 11300 1.74 15000 15000 2.09 11400 11400 1.75 15100 15100 2.10 11500 11500 1.76 15200 15200 2.11 11600 11600 1.77 15300 15300 2.12

DCV Min OA Flow Setpoint

(R41)

Airflow

CFM

Voltage

Reading

Voltage

Vdc

Design Min OA

Flow

Setpoint

(R130) Airflow

CFM

DCV Min OA Flow Setpoint

(R41)

Airflow

CFM

Voltage

Reading

Voltage

Vdc

RT-SVX34H-EN 49

Startup

Table 27. Design minimum OA flow setpoin t

Design Min OA

Flow

Setpoint

(R130) Airflow

CFM

15400 15400 2.13 17300 17300 2.32 15500 15500 2.14 17400 17400 2.33 15600 15600 2.15 17500 17500 2.34 15700 15700 2.16 17600 17600 2.35 15800 15800 2.17 17700 17700 2.36 15900 15900 2.18 17800 17800 2.37 16000 16000 2.19 17900 17900 2.38 16100 16100 2.20 18000 18000 2.39 16200 16200 2.21 18100 18100 2.40 16300 16300 2.22 18200 18200 2.41 16400 16400 2.23 18300 18300 2.42 16500 16500 2.24 18400 18400 2.43 16600 16600 2.25 18500 18500 2.44 16700 16700 2.26 18600 18600 2.45 16800 16800 2.27 18700 18700 2.46 16900 16900 2.28 18800 18800 2.47 17000 17000 2.29 18900 18900 2.48 17100 17100 2.30 19000 19000 2.49 17200 17200 2.31

DCV Min OA Flow Setpoint

(R41)

Airflow

CFM

Voltage

Reading

Voltage

Vdc

Design Min OA

Flow

Setpoint

(R130)

Airflow

CFM

DCV Min OA Flow Setpoint

(R41)

Airflow

CFM

Table 28. OA flow adjustment setpoint

OA Flow

Adjustment

(R136)

Multiplier/

Adjustment Vdc

0.80 0.00 0.92 0.88

0.81 0.05 0.93 0.94

0.82 0.14 0.94 1.00

0.83 0.22 0.95 1.06

0.84 0.30 0.96 1.10

0.85 0.35 0.97 1.18

0.86 0.43 0.98 1.22

0.87 0.51 0.99 1.25

0.88 0.57 1.00 1.3 - 1.84

0.89 0.64 1.01 1.86

0.90 0.72 1.02 1.89

0.91 0.78 1.03 1.92

Voltage Reading

OA Flow

Adjustment

(R136)

Multiplier/

Adjustment Vdc

Voltage

Reading

Voltage

Reading

Voltage

Vdc

Table 28. OA flow adjustment setpoint

OA Flow

Adjustment

(R136)

Multiplier/

Adjustment Vdc

1.04 1.96 1.13 2.20

1.05 2.00 1.14 2.24

1.06 2.03 1.15 2.26

1.07 2.06 1.16 2.28

1.08 2.10 1.17 2.30

1.09 2.12 1.18 2.34

1.10 2.14 1.19 2.36

1.11 2.16 1.20 2.40

1.12 2.18

Voltage

Reading

OA Flow

Adjustment

(R136)

Multiplier/

Adjustment Vdc

Voltage Reading

Ventilation Control

Units configured for Single Zone VAV control require special handling of the OA Damper Minimum Position control in order to compensate for the non-linearity of airflow associated with the variable supply fan speed and damper combinations.

Demand Controlled Ventilation

Units configured for SZVAV and Demand Controlled V entilation (CO control scheme comprised of 2 existing sc hemes that have been traditionally mutually exclusive; DCV and OA CFM Compensation.

Units configured with DCV will invoke the new Demand Controlled V entilation scheme whic h allows variable Bldg. Design and DCV Minimum Positions and OA Damper Position Target setpoints based on the supply fan speed and space CO

This new scheme wil l require the setting of 5 OA Damper position setpoints; 3 more than on non-SZ V AV . These new setpoints are located on the RTVM module:

1. Design Min Position @ Minimum Fan Speed Command (RTVM R130)

2. Design Min Position @ Middle Fan Speed Command (RTVM R136)

3. Design Min Position @ Full Fan Speed Command (RTEM Design Min Position)

4. DCV Min Position @ Minimum Fan Speed Command (RTVM R41)

5. DCV Min position @ Full Fan Speed Command (RTEM DCV Min Position)

As the supply fan speed command varies between minimum and maximum, the Building Design and DCV Minimum Position Targets will be calculated linearly between the user selected setpoints based on the

sensor value available) require a new

requirements.

50 RT-SVX34H-EN

Startup

Full Fan Speed

Design @ Middle Fan Speed

Fan Speed

Design @ Minimum Fan Speed

Design @ Full Fan Speed

DCV @ Minimum Fan Speed

DCV @ Full Fan Speed

instantaneous supply fan speed. The Bldg. Design and DCV Minimum Position Targets will be used to calculate the Active OA Damper Minimum Position Target, as on traditional units, based on the Space CO active Design and DCV CO

setpoints. Refer to Figure 40,

relative to the

p. 51 for additional details on the design.

The Design Minimum and DCV Minimum OA Damper Position setpoints at Minimum F an Speed Command and the Design Minimum OA Damper Position setpoint at Middle Fan Speed Command will have a range of 0-100% while the Design Minimum and DCV Minimum OA Damper Position setpoints at Full fan speed will have a range of 0-50%. Note that as on non-Single Zone VAV units, a 10% offset will be enforced between the Design and DCV Minimum Positions throughout the fan speed range.

By default, the Design Minimum Position schedule (red line below) will be a linear line through all user selectable Design Minimum Position setpoints. The user will have the ability to set the Design Minimum Position at Middle fan speed command to a point that would be lower than the calculated linear line between the Design Minimum Position setpoints at 0% and 1 00% fan speed command in order to compensate for the non-linear outside airflow through the fan and damper modulation range. However , if the Design Minimum Position at Mi dd le fan speed command is set to a point that would be higher than the calculated linear line between the Design Minimum Position setpoints at Minimum and Full fan speed command, the minimum position will be limited to the point that would make the Design Minimum Position schedule linear.

Provisions have been made in Service T est Mode to allow for proper damper minimum position setup:

1 . To set the Design and DCV Minimum Position setpoints

at Minimum Fan Speed, set the unit to operate at Step 1 (Fan ON) or Step 2 (Economizer Open) and make the proper adjustments.

2. To set the Design Minimum Position setpoint at Midd le Fan Speed, set the unit to operate at Step 3 (Cool 1) and make the proper adjustment.

3. To set the Design and DCV Minimum Position setpoints at Full Fan Speed, set the unit to operate at Step 4 (Cool

2) and make the proper adjustments.

Figure 40. SZVAV DCV with OA CFM compensation

OAD

Posion

Setpoints

Minimum Fan Speed

OAD Target

Setpoint

Increasing CO2

Middle

Corresponds to Design

CO2 (DCV UL) Setpoint

Corresponds to DCV CO2 (DCV

LL) Setpoint

Units with Traq Sensor

The outside air enters the unit through the Traq Sensor assembly and is measured by velocity pressur e flow rings. The velocity pressure flow rings are connected to a pressure transducer/solenoid assembly.The solenoid is used for calibration purposes to compensate for temperature swings that could affect the transducer.The ReliaTel Ventilation Module (RTVM) utilizes the velocity pressure input, the outdoor air temperature input, and the minimum outside air CFM setpoint to modify the volume (CFM) of outside air entering the unit as the measured airflow deviates from setpoint.

For units with Traq, when the optional CO installed and Demand Controlled Ventilation is enabled the Minimum Outside Air CFM Setpoint will be adjusted linearly between two airflow setpoints, the Design Minimum Outside Air (OA) CFM Setpoint (R130) and the DCV Minimum Outside Air CFM (OA) Setpoint (R41). The resulting calculated setpoint is the Minimum OA CFM T arget which is the setpoint us ed for active airflow control. The Minimum OA CFM Target Setpoint will vary proportionally between the DCV Minimum OA Flow CFM Setpoint and the Design Minimum OA CFM Setpoint as

varies between the CO2 Lower Limit Setpoint and the

CO2 Upper Limit Setpoint as shown in Figure 41. The CO2 setpoints are set on the RTEM as with normal DCV contro l without Traq option.

sensor is

RT-SVX34H-EN 51

Startup

Minimum Fan Speed

Middle Fan Speed

Maximum F Speed

Design @ Minimum Fan Speed

OAD Position Setpoints

Design @ Middle Fan Speed

Figure 41. Minimum outside air CFM setpoint

Outside Air Damper Minimum Positions without DCV

For units not configured with DCV (no CO2 sensor value available), additional minimum position setpoints to increase outdoor airflow accuracy will be supported. The operation will be similar to OA CFM Compensation on Traditional VAV units with the addition of a Design Minimum Position setpoint at Middle Fan Speed Command. The following setpoint potentiometers will be used on the RTEM:

1 . Design Min at Minimum Fan Speed Command (RTEM

DCV Min)

2. Design Min at Middle Fan Speed Command (RTEM DCV Setpoint LL)

3. Design Min at Full Fan Speed Command (RTEM Design Min)

The controller will calculate the active OA Damper Minimum position linearly between the user-selected setpoints based on the supply fan speed command. The range for the Design Min setpoints at Minimum and Middle Fan Speed Command will be 0-100% while the range for the Design Min at Full Fan Speed Command setpoint will be 0-50%.

By default, the Design Minimum Position schedule (red line below) will be a linear line through all user selectable Design Minimum Position setpoints. As with Demand Controlled Ventilation, if the Design Minimum Position at Middle fan speed command is set to a point that would be higher than the calculated linear line between the Design Minimum Position setpoints at Minimum and Maximum fan speed command, the minimum position will be limited to the point that would make the Design Minimum Position schedule linear.

Provisions have been made in Service T est Mode to allow for proper damper minimum position setup:

1. To set the Design Minimum Position setpoint at Minimum Fan Speed, set th e unit to op erate at Step 1 (Fan ON) or Step 2 (Economizer Open) and make the proper adjustment.

2. To set the Design Minimum P osition setpoint at Middle Fan Speed, set the unit to operate at Step 3 (Cool 1) and make the proper adjustment.

3. To set the Design Minimum Position setpoint at Full Fan Speed, set the unit to operate at Step 4 (Cool 2) and make the proper adjustment.

Figure 42. SZVAV OA damper min position w/ OA CFM

compensation

Space Pressure Control

For units configured with an exhaust fan, with or without Statitrac, the control described previously for economizer minimum position handling requires additional changes to the existing Space Pressure Control sch eme. The overall scheme will remain very similar to non-Single Zone VAV units with Space Pressure Control with the exception of a dynamic Exhaust Enable Setpoint.

For Single Zone V AV the user wil l select an Exhaust Enable Setpoint during the Maximum Fan Speed Command. Once selected, the difference between the Exhaust Enable Setpoint and Design OA Damper Minimum Position at Maximum Fan Speed Command will be calculated. The difference calculated will be used as an offset to be added to the Active Building Design OA Minimum Position T arget to calculate the dynamic Exhaust Enable Target to be used throughout the Supply Fan Speed/OA Damper Position range.

The Exhaust Enable Target could be above or below the Active Bldg Design OA Min P osition T arget Setpoint b ased on the Active Exhaust Enable Setpoint being set above or below the Bldg Design Min Position at Full Fan Speed Command. Note that an Exhaust Enable Setpoint of 0% will result in the same effect on Exhaust F an control as on non-Single Zone VAV applications with and without Statitrac.

52 RT-SVX34H-EN

Startup

OAD Position Setpoints

Exhaust Enable Target

Exhaust Enable @ Maximum Fan Speed

Design @ Maximum Fan Speed

Minimum Fan Speed Maximum Fan SpeedMiddle Fan Speed

Fan Speed Algorithm Command

Exhaust Enable Oset

Figure 43. Space pressure control graph

Traq Overrides and Special Considerations

Traq functionality is not used in unoccupied mode since fresh air control is an occupied ventilation function. Damper position will be set to 0% minimum in Unoccupied as with other types of unit configuration.

If the Remote Minimum Position pot on the RTEM is shorted (as with NOVAR controls) the Traq minimum damper position will be overridden to 0% as with other unit configurations.

Traq functions and sensor value are only valid during active Supply Fan operation therefore a value of "0 CFM" will be substituted for any low level (bleed through) sensor value that may be sensed on the OA Flow Sensor during "Fan OFF" periods. O A Da mper Minimum P o sition is only valid during active fan operation in all configurations.

The Design Min OA Flow Setpoint will be limited to a lower limit of 1,000 CFM and an upper limit of 20,000 CFM. Setting of valu es outside of this range, except for "0 CFM", will result in the setting being cl amped within the range. A value of "0" CFM will be allowed and will result in initialization of the Traq OA Damper Min Position calculation, and an active value of “0%” will be sent as the Active Traq setpoint. This allows the user to set the damper closed by setting the flow setpoint to 0 CFM.

If Demand Controlled Ventilation is configured then the lower limit of the Design Min OA Flow Setpoint will be 1,500 CFM to allow a gap to the DCV Min OA Flow Setpoint of 500 CFM making its lower limit 1,00 0 CFM. When the Design Min OA Flow Setpoint is greater than 1,500 CFM a minimum of 500 CFM offset will be enforced between the DCV Min OA Flow Setpoint and the Design Min OA Flow Setpoint.

If configured for Traq operation and OA CFM Compensation, the unit will perform Traq control since it will be the most accurate method of control. This situation might occur if a unit is upgraded to Traq control, but the OA

CFM Compensation config jumper on the R TEM is left on. It will be assumed by the presence of a valid OA CFM Flow Sensor and the RTVM version that supports Traq is accompanied by all the necessary unit e quipment upgrades.

Supply Air Temperature Control - Heating and Cooling

For Cooling, Heating (Modulating Heat Only), and Dehumidification operation the unit will control the active capacity outputs to meet a varying, calculated Discharge Air Setpoint that is calculated based on zon e conditions in order to maintain the Zone T emperature to the active Zone Setpoint. Note that this setpoint will be clamped between the user selected DA Heat and DA Cool - Fan Speed setpoints that are set on the RTOM for compressor and economizer control. In general, as the zone temperature rises above the ZCSP, the Active Discharge Air S etpoint will be calculated down and as the zone temperature falls below the ZHSP Tset will be calculated upward. This calculated setpoint is a direct indication of space demand and is also used to determine the proper supply fan speed to meet the space requirements. During active capacity control, the unit will utilize a +/- 3.5°F deadband around the active Discharge Air Setpoint to determine when to request additional heating or cooling capacity similarly to traditional VAV control, as described below. If the unit is maintaining the disch arge air temperature within the +/-

3.5°F deadband around the calculated discharge air

setpoint requirements, no additional capacity will be requested.

The calculated setpoint will also be used for active economizer control, but the economizer will utilize a tighter control deadband (+/- 1.5°F) than that is used for compressor output control. Also, as on Traditional VAV units, mechanical cooling will be inhibited if econ omizing is enabled until the economizer has been full open for 3 minutes.

Variable Air Volume Applications (Traditional VAV)

Supply Air Temperature Control Occupied Cooling and Heating

The RTRM is designed to maintain a selectable supply air temperature of 40°F to 90°F with a +/- 3.5°F deadband. In cooling, if supply air temperature is more than 3.5 degrees warmer than the selected temperature, a stage of cooling will be turned “On” (if available). Then if the supply air temperature is more than 3.5 degrees cooler than the selected temperature, a stage of cooling will be turned “Off”.

At very low airflows the unit may cycle stages “On” and “Off” to maintain an average discharge air temperature outside the 7 degree deadband.

RT-SVX34H-EN 53

Startup

If the unit has modulating heat, the unit can be made to do discharge heating with VAV control. This is done by placing a contact closure across the “Changeover Input” on the RTAM. During this mode, the unit will heat to the Supply Air Heating Setpoint +/- 3.5°F. During low load or low airflow conditions the actual temperature swing of the discharge air will likely be greater.

The RTRM utilizes a proportional and integral control scheme with the integration occur ring when the supply air temperature is outside the deadband. As long as the supply air temperature is within the setpoint deadband, the system is considered to be satisfied and no staging up or down will occur.

Supply Air Temperature Control with an Economizer

The economizer is utiliz ed to control the supply air cooling at +1 .5°F around the supply air temperature setpoint range of 40°F and 90°F providing the outside air conditions are suitable.

While economizing, the mechanical cooling is disabled until the economizer dampers have been fully open for three minutes. If the economizer is disabled due to unsuitable conditions, the mechanical cooling will cycle as though the unit had no economizer.

VHR Relay Output

During unoccupied mode, daytime warm-up (DWU) and morning warm-up (MWU) the VFD will open to 100%. All VA V boxes must be opened thro ugh an ICS program or by the VHR wired to the VAV boxes. The RTRM will delay 100% fan operation approximately 6.5 minutes when switching f rom occupied cooling mode to a heating mode.

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied Cooling

When a field supplied occupied/unoccupied switching device is connected between RTRM J6-1 1 and RTRM J6-12, both the economizer and the mechanical cooling will be disabled.

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied Heating

When a field supplied occupied/unoccupied switching device is connected between RTRM J6-11 and J6-12 and DWU is enabled, the zone temperature will be controlled at 10°F below the Morning Warm-up setpoint, but not less than 50°F, by cycling one or two stages of either gas or electric heat, whichever is applicable.

Morning Warm-up (MWU) Control

Morning Warm-up is activated if the zone temperature is at least 1 .5°F below the MWU setpoint whenever the system switches from Unoccupied to Occupied status. The MWU setpoint may be set from the unit mounted potentiometer or a remotely mounted potentiometer. The setpoint ranges are from 50°F to 90°F. When the zone temperature meets or exceeds the MWU setpoint, the unit will switch to the “Cooling” mode. The economizer w ill be h el d c los ed during the morning warm-up cycle.

Daytime Warm-up (DWU) Control

Daytime Warm-up is applicable during occupied status and when the zone temperature is below the initiation temperature. It can be activated or deactiva ted through ICS or a night setback z one sensor . If ICS or a night setbac k zone sensor is not utilized, DWU can be activated by setting the DWU enable DIP switch (RTAM) to ON and supplying a valid morning warm-up setpoint.

The unit is shipped with a Morning Warm-up setpoint configured and the Daytime W arm-up function is activated (switch on). Opening the DWU enable switch will disable this function.

If the system control is local, the DWU initiation setpoint is 3°F below the Morning Warm-up setpoint. The terminatio n setpoint is equal to the Morning Warm-up setpoint.

If the system control is remote (Tracer™), the DWU setpoint is equal to the Tracer Occupied heating setpoint. The initiation and termination setpoints are selectable setpoints designated by Tracer.

When the zone temperature meets or exceeds the termination setpoint while the unit is in an Occupied, “Auto” Mode or switched to the “Cooling” Mode, the unit will revert to the cooling operation.

If an Occupied “Heating” Mode is selected, the unit will only function within the DWU perimeters until the system is switched from the “Heat” Mode or enters an Unoccupied status.

Note: When a LCI is installed on a VAV unit, the MWU

setpoint located on the RTAM board is ignored. The MWU and DWU setpoints come from the higher priority LCI-R DAC.

Supply Duct Static Pressure Control

The supply duct static pressure is measured by a transducer with a 0.25 to 2.125 Vdc proportional output which corresponds to an adjustable supply duct static pressure of 0.3" w.c. to 2.5" w.c. respectively with a deadband adjustment range from 0.2" w.c. to 1.0" w.c. The setpoint is adjustable on the RTAM Static Pressure Setpoint potentiometer or through ICS.

Example: Supply Duct Static setpoint = 2.0" w.c. (RTAM)

54 RT-SVX34H-EN

Startup

Transducer Voltage Output vs Pressure Input

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

-0. 5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Pressure (inches w.c.)

Volts

Deadband = 0.2" w.c. (RTAM) Duct Static Control Range = 1.9" w.c. to 2.1" w.c.

Figure 44. Output vs. input

Supply Air Temperature Reset

The supply air temperature can be reset by using one of four DIP switch confi gurations on the RT AM or through ICS when a valid supply air reset setpoint with a supply air reset amount is given. A selectable reset amount of 0° F to 20°F via RT AM potentiometer or ICS i s permissible for each type of reset.

The amount of change applied to the supply air temperature setpoint depends on how far the retu rn air, zone, or outdoor air temperature falls below the reset temperature setpoint. If the return air , zone, or outdoor air temperature is equal to or greater than the reset temperature setpoint, the amount of change is zero.

If the return air, or zone temperature falls 3°F below the reset temperature setpoint, the amount of reset applied to the supply air temperature will equal the maximum amount of reset selected.

If the outdoor air temperature falls 20°F below the reset temperature setpoint, the amount of reset applied to the supply air temperature will equal the maximum amount of reset selected. The four DIP switch configurations are as follows:

1. None - When RTAM DIP Switch #3 and #4 are in the “Off” position, no reset will be allowed.

2. Reset based on Return Air Temperature - When RT AM DIP Switch #3 is “Off” and Switch #4 is “On”, a selectable supply air reset setpoint of 50°F to 90°F via a unit mounted potentiometer or Tracer™ is permissible.

3. Reset based on Zone Temperature - When RTAM DIP Switch #3 is “On” and Switc h #4 is “Off”, a selectable supply air reset setpoint of 50°F to 90°F via RTAM potentiometer or Tracer is permissible.

4. Reset based on Outdoor Air Temperature - When DIP Switch #3 and #4 are “On ”, a selectable supply air reset

RT-SVX34H-EN 55

setpoint of 0°F to 100°F via RTAM potentiometer or Tracer is permissible.

VAV Supply Air Tempering (Only Available with Modulating Gas Heat)

The gas heater will be modulated to prevent the Discharge Air Temperature from falling below the Discharge Temperature Deadband. Upon satisfyi ng the Supply Air T empering requirements, a 5 minute S A Tempering Delay timer will start whenever the modulating gas heat combustion blower is commanded to 0 and must time out before the unit will be allowed to re-enter “Cool” mode. This timer will be reset to 5 minutes whenever there is an active call for “Supply Air Tempering”. Tempering will be discontinued whenever;

a. The 5 minutes “Supply Air T empering Delay” timer

has timed-out and;

b. There is an active cooling request for VA V Occupied

Cooling.

Constant Volume or Variable Air V olume Applications (Single Zone or Traditional)

Off Mode

This mode is set at the zone sensor or by ICS. Duri ng this status, no heating, ventilation, or mechanical cooling is being performed. When switching the “S ystem” selector to the “Of f” mode from any other mode, any diagnostic data and diagnostic indication signal will be retained as long as the system remains in the “Of f ” status. Switc hing the “System” selector from the “Off” mode back to any other mode of operation will reset all diagnostics.

Zone Temperature - Unoccupied Cooling (CV or SZ VAV Only)

While a building is in an unoccupied period as designated by a remote panel with night setback, ICS or RTRM J6-11 and J6-12, the necessary cooling capacity will be controlled to maintain the zone temperature to within the unoccupied setpoint deadband. If an economizer is enabled, it will modulate in an attempt to maintain the zone temperature to within the setpoint deadband.

Note: On SZ VAV units, the Supply Air Fan Speed will be

controlled as during normal occupied conditions in order to meet the requirements of the zone. Unoccupied mode does not require full airflow on a SZ VAV unit during Cooling operation.

Zone Temperature - Unoccupied Heating

While a building is in an unoccupied period as designated by a remote panel with night setback or ICS, the necessary heating capacity will be controlled to maintain the zone temperature to within the unoccupied setpoint dead band.

Startup

For traditional V A V systems, the VFD will operate at 1 00% during this mode. It will be necessary to drive VAV boxes to their maximum position through ICS programming or the factory provided VHR relay. For SZ VAV systems, the Supply Air Fan VFD will remain in control as during normal occupied periods and will be controlled in order to meet the space requirements. The minimum fan speed will be based on the configured unit heating type. For Modulating Heat units, Full Airflow is not required for SZ VAV applications during Unoccupied periods. For all Staged Heating types, the Supply Fan will be controlled at maximum fan speed during active heating operation as during Occupied periods.

Mechanical Cooling with an Economizer

The economizer is utilized to control the zone temperature when the outside air conditions are suitable. The method used to determine economizer effectiveness, depending on the available data, is described below in descendin g order of complexity. The most sophisticated method available is always used.

Table 29. Economizer effectiveness

Method used to determine economizer effectiveness Required

Comparative Enthalpy OAT, OAH, RAT, RAH Reference Enthalpy OAT, OAH Reference Dry Bulb OAT Unable to determine

effectiveness

T wo of the three methods for determining the suitability of the outside air can be selected utilizing the potentiometer on the Economizer Actuator, as described below:

1. Ambient Temperature - controlling the economizing cycle by sensing the outside air dry bulb temperature.

Table 30 lists the selectable dry bulb values by

potentiometer setting.

2. Reference Enthalpy - controlling the economizer cycle by sensing the outdoor air humidity. selectable enthalpy values by potentiometer setting. If the outside air enthalpy value is less than the selected value, the economizer is allowed to operate.

Table 30. Economizer configuration

Selection Dry Bulb Enthalpy Value

A 73°F 27 BTU/LB Air B 70°F 25 BTU/LB Air C 67°F 23 BTU/LB Air D 63°F 22 BTU/LB Air E 55°F 19 BTU/LB Air

3. Comparative Enthalpy - By utilizing a humidity sensor and a temperature sensor in both the return air stream and the outdoor air stream, the economizer will be able

OAT data is invalid or unavailable

Table 30 lists the

to establish which conditions are best suited for maintaining the zone temperature, i.e., indoor conditions or outdoor conditions.

Gas Heat Control

The ignition sequence and timing are provided by a separate heat control module. The RTRM on ly provides the heating outputs to initiate 1st and 2nd stages and control the combustion blower relays. Both stages of the furnace, when initiated after each cycle, will start and operate for one minute then cycle back if only one stage is required. Units with modulating heat capabil ities will light on high fire for one minute and then modulate to the appropriate heating rate for the building load present.

When the fan selection switc h is in the “AUTO” mode and the unit is configured as a Constant V olume w ith staged or modulating gas heat, or SZ VA V with staged gas heat, the fan will be delayed from coming on for approximately 30 seconds after a call for heat has been initiated. The fan will remain on for approximately 90 seconds after the heating setpoint has been satisfied. If the unit is configured for SZ VAV with modulating heat, the fan will be energized with the call for heating in order to begin circulating airflow through the unit for discharge air temperature control. Once the call for heating is removed, the fan will remain on for approximately 90 seconds.

Electric Heat Control

The RTRM provides two heating outp uts for 1st and 2nd stages that will be controlled with at least a 10 seconds delay between each stage. When the fan selection switch is in the “AUTO” mode and the unit is configured for Constant Volume, the fan will start approximately 1

second before the 1

heater stage is activated. The fan and heater will cycle off after the heating setpoint has been satisfied. If the unit is configured for SZ VAV control, the Supply Fan will energize approximately 5 seconds prior to energizing the electric heat outputs. Once the Zone Heating requirements have been satisfied, the fan and heat outputs will be controlled off.

Clogged Filter Option

The unit mounted clogged filter switch monitors the pressure differential across the return air filters. It is mounted in the filter section and is connected to the RTOM. The switch is adjustable and can be set for a particular application. The clogged filter switch is normally open and will automatically close when the pressure differential across the filters falls below the clogged filter setpoint. The RTOM will generate a SERVICE diagnostic that will be sent to the zone sensor or remote panel when the clogged filter switch has been closed for at least 2 minutes during supply fan operation. The system will continue to operate regardless of the status of the clogged filter switch.

56 RT-SVX34H-EN

Startup

Ventilation Override

Note: Applying 24 volts to one of the three Ventilation

Override Inputs manually activates ventilation override. One input is provided to request the Pressurize Mode, the second input the Purge Mode, and the third input the Exhaust Mode.

When the Pressurize Mode is selected, activating Ventilat ion Override will cause the supply fan to run, the economizer to open to 100%, the exhaust fan to turn (remain) off, or the VFD to run at full speed (SZ VAV and Traditional VAV), and the VAV boxes to fully open.

When Purge is selected, activating Ventilation Override will cause the supply fan to run, the economizer to open to 100%, the exhaust fan to run, or the VFD to run at full speed (SZ VAV or Traditional VAV), and the VAV boxes to fully open.

When Exhaust is selected, activating Ventilation Over ride will cause the supply fan to turn off, the economizer to close to 0%, the exhaust fan to run (exhaust damper at 100% if configured for Statitrac), or the VFD to stop, and the VAV boxes to operate normally.

If more than one mode is requested at the same time, the Pressurize request will have priority followed by Purge. When any V entilation Over ride Mode is active, all heating and cooling is turned off. For the case where the unit is required to turn off, the Emergency Stop input is used. The ICS can also initiate any ventilation override mode.

Table 31 lists the sequence of events within the system for

each ventilation mode. Refer to the unit wiring diagram for contact switching and wiring.

Note: Fresh air tracking will not work with VOM.

Table 31. Ventilation override sequence

Mode and Priority

Affected Function Pressurize Purge Exhaust

123 Heat/Cool off off off VFD full speed full speed full speed Supply Fan on on off Exhaust Fan off on Economizer open open closed

VAV Boxes forced open forced open

(a)Exhaust mode 3 is not available with the tracking power exhaust

option.

(b)For units configured with the Statitrac option, the Exhaust Damper

will open during Ventilation Override modes that request the exhaust fan to operate.

(b)

normal operation

(a)

Emergency Stop

When this binary input is opened, all outputs are immediately turned off and the system will not be allowed to restart until the binary input is closed for appro ximately 5 seconds minimum. The shut down is communicated to

Tracer™ if applicable and the Heat and Cool LED outputs (RTRM J6-7 and J6-8) will blink at a nominal rate of 1 blink per second.

Phase Monitor

The Phase Monitor is a 3 phase line monitor module that protects against phase loss, phase reversal and phase unbalance. It is intended to protect compressors from reverse rotation. It has an operating input voltage range of 190-600 VA C, and LED indicators for ON and FAUL T. There are no field adjustments and the module will automatically reset from a fault condition.

Low Pressure Control

This input incorporates the low pressure cutout of each refrigeration circuit and can be activated by opening a field supplied contact.

If this circuit is open before a compressor(s) is started, neither compressor in that circuit will be allowed to operate.

Anytime this circuit is opened for 5 continuous seconds, the compressor(s) in that circuit are turned off immediately. The compressor(s) will not be allowed to restart for a minimum of 3 minut es.

If four consecutive open conditions occur during the first three minutes of operation, the compressor(s) in that circuit will be locked out, a diagnostic communicated to Tracer, and a manual reset will be required to restart the compressor(s).

The dehumidification option has one reheat low pressure cutout (RLP). The RLP is located on the reheat circuit.

Dehumidification Low Pressure Control

The RLP has been added to insure proper refrigerant management during active modulating hot gas reheat operation.

The RLP will be ignored for the first 10 minutes of compressor run time during active hot gas reheat operation. Anytime this circuit is opened for 5 continuous seconds, the compressor(s) in that circuit are turned off immediately. The compressor(s) will not be allowed to restart for a minimum of 3 minutes. If four consecutive open conditions occur during active dehumidification, t he compressor(s) in that circuit will be locked out.

High Pressure Cutout and Temperature Discharge Limit

The high pressure controls and temperature discharge limit are wired in series between the compressor outputs on the RTRM and the compressor contactors. On 27.5, 30, and 35 Ton units, if the high pressure safety switch or temperature discharge limit opens, the RTRM senses a lac k of current while calling for cooling and locks both compressors out with an auto reset. On 40 and 50 Ton units, if the high pressure safety or temperature discharge

RT-SVX34H-EN 57

Startup

OAD

Posion Setpoints

Design @ Full Fan

Speed

Exhaust Enable

Oﬀset

Exhaust Enable @

Full

Fan Speed

Exhaust Enable Target

-0.75 to 9.0 Iwc Pressure Transducer Voltage Output vs. Pressure Input

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

-0.75-0.

Pressure (inches w.c.)

Volts

limit opens, the compressor(s) on the affected circuit is locked out. If the compressor output circuit is opened four consecutive times during compressor operation, the RTRM will generate a manual reset lockout.

Power Exhaust Control (Standard)

The power exhaust fan is started whenever the position of the economizer dampers meets or exceed the power exhaust setpoint when the supply fan is on.

The setpoint potentiometer is on the RTOM and is factory set at 25% for traditional constant volume and variable air volume units.

For SZ VAV units the default power exhaust enable setpoint will be 25% as on non-SZ VAV units. However , for SZ VAV the Exhaust Enable Setpoint will need to be adjusted for the proper setpoint during the maximum Fan Speed Command for the unit. Once selected, the difference between the Exhaust Enable Setpoint and Design OA Damper Minimum Position at Full Fan Speed Command will be calculated. The difference calculated will be used as an offset to be added to the Active Building Design OA Minimu m Position Target to calculate the dynamic Exhaust Enable T arget to be used throughout the Supply Fan Speed/OA Damper Position range:

Exhaust Enable Target = Active Bldg Design OA Min Position Target + (Active Exhaust Enable Setpoint – Active Bldg Design OA Min Position @ Full F an Speed Command)

The Exhaust Enable Target could be above or below the Active Bldg Design OA Min Position T arget Setpoint based on the Active Exhaust Enable Setpoint being set above or below the Bldg Design Min Position at Full Fan Speed Command. Note that an Exhaust Enable Setpoint of 0% will result in the same effect on Exhaust Fan control as on non-Single Zone VAV applications with and without Statitrac; Exhaust Fan ON. Se e Figure 45, p. 58 for how the exhaust enable setpoint is modified throughout the OA damper operating range.

Figure 45. SZ VAV exhaust

Space Pressure Control - Statitrac

A pressure transducer is used to measure and report direct space (building) static pressure. The user-defined control parameters used in this control scheme are Space Pressure Setpoint and Space Pressure Deadband. As the Economizer opens, the building pressure rises and enables the Exhaust Fan. The Exhaust dampers will be modulated to maintain Space Pressure within the Space Pressure Deadband.

Note: The Exhaust Enable setpoint will need to be

selected as on units with standard power exhaust control.

Figure 46. T r ansducer v oltag e output vs. pr essur e input f or

building pressure

Power Exhaust Control (Tracking)

The power exhaust dampers proportionally trac k or follow the fresh air (economizer) damper position. The offset between the fresh air and the exhaust damper(s) is adjustable, see figures beginning with Figure 53, p. 76. Refer to Power Exhaust Fan Performance” tables beginning with Table 50, p. 76.

Lead/Lag Control

Lead/Lag is a selectable input located on the RTRM. On 2 & 3 stage standard efficiency units, the RTRM is configured from the factory with the Lead/Lag control disabled. To activate the Lead/Lag function, simply remove the jumper connection J3-8 at the RTRM Lead/Lag input. When it is

Maximum Fan Speed Minimum Fan Speed Middle Fan Speed

58 RT-SVX34H-EN

activated, each time the designated lead compressor(s) is shut off due to the load being satisfied, the lead compressor or refrigeration circuit switches. On the 5 stage high efficiency units, the RTRM is configured from the factory with the Lead/Lag control enabled. With it active, each time the desi gnat ed lead comp resso r i s shut off due to the load being satisfied, the controls will sw itc h to the next staging sequence. When the R TRM is powered up, i.e. after a power failure, the control will default to the number one compressor.

Startup

Table 32. Capacity steps with lead/lag enabled - std

Efficiency

Unit Size Step 1 Step 2 Step 3

TC*330

TC*360

TC*420

TC*480

TC*600

LEAD 48% 100% LAG 52% 100% LEAD 50% 100% LAG 50% 100% LEAD 47% 100% LAG 53% 100% LEAD 40% 60% LAG 60% 100% LEAD 32% 68% LAG 68% 100%

100%

Table 33. Capacity staging sequence - high Efficiency

Steps

Unit SizeSequence12345

1 25376375100

TC*330

TC*360

TC*420

TC*480

TC*600

2 37 63 75 100 3 1 24386276100 2 3 1 22396178100 2 3 1 23396177100 2 3 1 25386275100 2 3

37 63 75 100

38 62 76 100 38 62 76 100

39 61 78 100 39 61 78 100

39 61 77 100 39 61 77 100

38 62 75 100 38 62 75 100

Dehumidification Frost Protection

T wo control schemes will be active on units configured for Dehumidification. The first employs the use of the Frostat function. The second scheme takes precedence over Frostat. Operation will be as described below.

The second scheme is in control during active dehumidification or cooling and includes the use of an Entering Evaporator Temperature sensor (EET). If the EET drops below 35°F for 1 0 continuous minutes compressors will stage off. For dual circuit units one circuit will be staged off initially , and then if the EET remains below 35ºF for an additional 10 minutes, the second circuit will be staged off. Fo r single circuit units one compressor wil l be staged off initially , and then if the EET remains below 35ºF for an additional 10 minutes, the second circuit will be staged off. When the unit is operating in dehumid ification mode, only the reheat circuit will be re-enabled if the EET rises above 45ºF. The cooling circuit will n ot be re-enabled during dehumidification until the unit leaves the current dehumidification cycle or a dehumidification purge is initiated. If the unit is operating in Coolin g, the first circuit that de-energized will be re-enabled when the EET rises above 45ºF. The second compressor will be allowed to reenergize at 10 minutes af ter the EET rises above 45ºF or if a purge cycle is initiated.

Drain Pan Condensate Overflow Switch (Optional)

This input incorporates the Condensate Overflow Switch (COF) mounted on the drain pan and the ReliaTel Options Module (RTOM). When the condensate level reaches the trip point for 6 continuous seconds, the RTOM will shut down all unit function until the overflow condi t ion has cleared. The unit will return to normal operation after 6 continuous seconds with the COF in a non-tripped condition. If the condensate level causes the unit to shutdown more than 2 times in a 3 day period, th e unit will be locked-out of operation. A manual reset of the diagnostic system through the Zone Sensor or Building Automation System (BAS) will be required. Cycling unit power will also clear the fault.

Coil Frost Protection

The Frostat™ control monitors the suction line temperature to prevent the evaporator from freezing due to low operating temperatures whenever there is a demand for cooling. When a closed circuit has occ urred for 5 seconds minimum, the RTRM turns of f all of the cooling outputs. The Supply Fan will be held “On” until the Frostat has been open for 5 continuous seconds or for 60 seconds after the last compressor was shut “ Off”, whichever is the longest. The compressor shutdown is communicated to Tracer, if applicable. There is no local diagnostic for this condition.

VFD Programming Parameters

See System Troubleshooting section.

Condenser Fan Sequencing Control

The condenser fans are cycled according to the outdoor air temperature and the number of cooling steps that are operating. Table 34 lists the temperatures at which the A and B Condenser Fan Outputs on the RTRM switches the fans “Off”. The fans are switched back “ON” when the outdoor temperature rises approximately 5° F above the “Off” temperature.

Figure 47, p. 60 shows the condenser fans as viewed from

the top of the unit facing the control panel. Whenever a condenser fan is cycled back “On”, the condenser fan

RT-SVX34H-EN 59

Startup

Outputs A and B and the compressor steps are deenergized for approximately seven seconds to prevent problems with fan windmill.

Figure 47. Condenser fan location

Table 34. Condenser fan/compressor sequence - std

efficiency

Compressor Staging

Unit

Sequence Condenser Fan Output

Size

(Ton)

Step 1 Step2 Step 3 Output A Output B

CPR

(a)

27.5 -

Notes:

1. The Compressor(s) listed under each step are the operating

2. Conventional thermostat sequence: Y1=CPR1, Y2=CPR2 (40 CPR 2 &

3. During active dehumidification all compressors will be staged “On”.

(a) Single circuit, manifolded compressors pair. (b)First Stage, Number one refrigeration circuit, Standalone compressor is

(c) First Stage is “Off”, Number two refrigeration circuit, standalone com(d)First stage is “Off”, Number two refrigeration circuit, manifolded com-

compressors. On 27.5 to 35 Ton units with Lead/Lag, CPR1 will alternate but the fan sequence will remain the same. On 40 & 50 Ton units with Lead/Lag, the comp ressor(s) in step 2 & 3 will alternate and the fan sequence listed for that step will be in operation.

50 CPR 2,3), Y1 + Y2 = CPR1,2 (40 CPR 1,2 & 50 CPR 1,2,3) For units equipped with four condenser fans (40 and 50 Ton), the

condenser fan output states will be controlled based on the O/A temperature. If O/A is above 85°F, all condenser fan outputs will be energized. If O/A falls below 80°F, Output B will de-energize and will not re-energize again until the O/A rises above 85°F. For units configured with three condenser fans (27.5 to 35 Ton), a maximum of two condenser fans will energize. Output A will energize above 85°F and de-energize w he n the O /A f alls b el ow 8 0°F; Output B will remain de-energized during active dehumidification. If O/A falls below 80°F, Output A will de-energize and will not re-energize again until O/A rises above 85°F

“On”. pressor is “On”. pressor pair is “On” operating simultaneously.

CPR

(a)

CPR

(b)

CPR

(b)

CPR 1, 2

CPR 2,

CPR

(c)

(d)

N/A

CPR 1, 2

CPR 1, 2, 3

Fan #2 70

Fan #3 90

Fan #2 -10

Fan #3 60

Fan #2 65

Fan #3 85

Fan #2 -20

Fan #3 55

Fan #2 50

Fan #3, 4 70

Fan #2 20

Fan #3, 4 60

Fan #2 -30

Fan #3, 4 50

Fan #2 20

Fan #3, 4 60

Fan #2 -10

Fan #3, 4 55

Fan #2 -30

Fan #3, 4 50

O/A

Temp.

(°F) Fans

“Off”

60 RT-SVX34H-EN

Table 35. Condenser fan/compressor sequence - high efficiency

27.5-35 Ton High Efficiency Compressor Stage 1 Compressor Stage 2 Compressor Stages 3 or 4 Compressor Stage 5

Startup

Fan #1Fan #2Fan

Range

OFF OFF 0-70 1

OFF 70-75 1 or 2 OFF1OFF 58-63 1 OR 2 OFF1OFF 60-65 1 OR 2 OFF1OFF 50-55 1 OR 2

OFF

ON OFF 75-80 2 ON OFF 63-70 2 ON OFF 65-70 2 ON OFF 55-60 2

Ambient

ON OFF ON ON 85-115 3 ON ON 75-115 3 ON ON 75-115 3 ON ON 65-115 3

80-85 2 or 3 ON OFF170-75 2 OR 3 ON OFF170-75 2 OR 3 ON OFF160-65 2 OR 3

Cond

FansOnFan #1Fan #2Fan

(F)

Ambient

OFF OFF 0-58 1

Range

(F)

# Cond FansOnFan #1Fan #2Fan

OFF OFF 0-60 1

Ambient

Range

(F)

Cond

FansOnFan #1Fan #2Fan

OFF OFF 0-50 1

40 Ton High Efficiency

Compressor Stages 1&2 Compressor Stages 3&4 Compressor Stage5

Fan #1Fan

#3&

OFF OFF 0-65 1

OFF

ON OFF 70-80 2 ON OFF 65-75 2 ON OFF 45-65 2 ON OFF ON ON 85-115 4 ON ON 80-115 4 ON ON 70-115 4

Range

OFF 65-70 1 or 2 OFF1OFF 60-65 1 OR 2 OFF1OFF 40-45 1 OR 2

80-85 2 or 4 ON OFF175-80 2 OR 4 ON OFF165-70 2 OR 4

Ambient

(F)

Cond

FansOnFan #1Fan

OFF OFF 0-60 1

Fan

#3&

Ambient

Range

(F)

Fan

# Cond FansOnFan #1Fan

OFF OFF 0-40 1

Fan #3&

Ambient

Range

(F)

Cond

Fans

Ambient

Range

(F)

Cond

Fans

50 Ton High Efficiency

Compressor Stages 1&2 Compressor Stages 3&4 Compressor Stage5

Fan #1Fan

Notes:

1. Condenser fan will de-energize at 5ºF below the energizing temperature

2. Compressor Stage 1 = CPR1

3. Compressor Stage 2 = CPR2 or CPR3 depending on staging sequence

4. Compressor Stage 3 = CPR1 & CPR2 or CPR2 & CPR3 depending on staging sequence

5. Compressor Stage 4 = CPR2 & CPR3

6. Compressor Stage 5 = CPR1 & CPR2 & CPR3

7. Conventional three stage thermostat sequence: Y1=CPR1 (Stage 1), Y2=CPR1&2 (Stage 3), Y1 + Y2 = CPR1,2,3 (Stage 5)

8. During active dehumidification all compressors will be staged “On”. For units equipped with four condenser fans (40 and 50 Ton), the condenser fan output

states will be controlled based o n the O/A te mper ature. If O/A is abo ve 85° F, all condenser fan outputs will be energized. If O /A falls below 80°F, Output B will de-energize and will not re-energize again until the O/A rises above 85°F. F or units configured with three condenser fans (27.5 to 35 Ton), a maximum of two condenser fans will ener giz e. Outpu t A w ill e nergi z e abo ve 85°F and de-e nergi ze when the O/A falls be low 8 0°F; Output B will remain de-energized during active dehumidification. If O/A falls below 80°F, Output A will de-energize and will not re-energize again until O/A rises above 85°F.

#3&

OFF OFF 0-60 1

OFF

ON OFF 65-75 2 ON OFF 60-70 2 ON OFF 40-60 2 ON OFF ON ON 80-115 4 ON ON 75-115 4 ON ON 65-115 4

Range

OFF 60-65 1 or 2 OFF1OFF 55-60 1 OR 2 OFF1OFF 35-40 1 OR 2

75-80 2 or 4 ON OFF170-75 2 OR 4 ON OFF160-65 2 OR 4

Ambient

(F)

Cond

FansOnFan #1Fan

OFF OFF 0-55 1

Fan

#3&

Ambient

Range

(F)

Fan

# Cond FansOnFan #1Fan

OFF OFF 0-35 1

Fan #3&

Ambient

Range

(F)

Cond

Fans

RT-SVX34H-EN 61

Startup

Preparing the Unit for Operation

Be sure to complete all of the procedures described in this section before starting the unit for the first time.

Use the checklist provided below in conjunction with the “Installation Checklist” to ensure that the unit is properly installed and ready for operation.

WARNING

Hazardous Voltage!

• Check all electrical connections for tightness and “point of termination” accuracy.

• V erify that the condenser airflow will be unobstructed.

• Check the compressor crankcase oil level. Oil should be visible in the compressor oil sight glass. The oil level may be above the sight glass prior to the initial start. Use appropriate lighting (flashlight) to verify the presence of oil.

• Prior to unit startup allow the crankcase heater to operate a minimum of 8 hours to remove liquid refrigerant from the compressor sump.

• Optional Service Valves - Verify that the discharge service valve, suction service valve, and liquid line service valve is fully open on each circuit.

Note: High Efficiency units come standard with disc harge

and liquid line service valves.

• Check the supply fan belts for proper tension and the fan bearings for sufficient lubrication. If the belts require adjustment, or if the bearings need lubricati ng, refer to the Maintenance section of this manual for instructions.

• Inspect the interior of the unit for tools and debris and install all panels in preparation for starting the unit.

WARNING

Hazardous Voltage!

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

• Open the disconnect switch or circuit protector switch that provides the supply power to the unit's power terminal block or to the unit mounted disconnect switch.

• To be consistent with the compresso r leads, connect the phase sequence indicator leads to the terminal block or unit mounted disconnect switch as follows;

Table 36. Phase sequence leads

Phase Sequence Leads Unit Power Terminal

Red (phase A) L1 Blue (phase B) L2 Black (Phase C) L3

• Turn the “System” selection switch to the “Off” position and the “Fan” selection switc h (if Applicable) to the “Auto” position.

• Close the disconnect switch or circuit protector switc h that provides the supply power to the unit's power terminal block or unit mounted disconnect switch.

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. F ailure t o follow all electr ical safety precautions when exposed to live electrical components could result in death or serious injury.

Electrical Phasing

Unlike traditional reciprocating compressors, scroll compressors are phase sensitive. Proper phasing of the electrical supply to the unit is critical for proper operation and reliability.

The compressor motor is internally connected for clockwise rotation with the incoming power supply phased as A, B, C. Proper electrical supply phasing can be quickly determined and corrected before starting the unit by using an instrument such as an Ideal - Sperry 61-520 Phase Sequence Indicator and following the steps below:

62 RT-SVX34H-EN

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK HTB1 OR UNIT DISCONNECT SWITCH.

• Observe the ABC and CBA phase indicator lights on the face of the sequencer. The ABC indicator light will glow if the phase is ABC. If the CBA indicator light glows, open the disconnect switc h or circuit protection switc h and reverse any two power wires.

• Restore main electrical power and rec h eck phasing. If the phasing is correct, open the disconnect switch or circuit protection switch and remove the phase sequence indicator.

Voltage Supply and Voltage Imbalance

Volt1 Volt2 Volt3++

---------------------------------------------------------------

221 230 227++

---------------------------------------------- -

226Avg=

226 221–

226

----------------------------

100 2.2percent=×

Supply Voltage

Electrical power to the unit must meet stringent requirements for the unit to operate properly. Measure each leg (phase-to-phase) of the power supply. Each reading must fall within the utilization range stamped on the unit nameplate. If any of the readings do not fall within the proper tolerances, notify the power company to correct this situation before operating the unit.

Voltage Imbalance

Excessive voltage imbalance between phases in a three phase system will cause motors to overheat and eventually fail. The maximum allowable voltage imbalance is 2%. Measure and record the voltage between phases 1, 2, and 3 and calculate the amount of imbalance as follows:

% Voltage Imbalance = where; AV (Average Voltag e) =

Volt 1, Volt 2, Volt 3 = Line Voltage Readings VD = Line Voltage reading that deviates the far thest f rom

the average voltage. Example: If the voltage readings o f the supply power measured 221,

230, and 227, the average volts would be:

VD (reading farthest from average) = 221 The percentage of Imbalance equals:

The 2.2% imbalance in this example exceeds the maximum allowable i mb alance of 2.0%. This much imbalance between phases can equal as much as a 20% current imbalance with a resulting increase in motor winding temperatures that will decrease motor life.

If the voltage imbalance at the job site is over 2%, notify the proper agencies to correct the voltage problem to within

2.0% before operating this equipment.

Starting the Unit

Before closing the main power disconnect switch, insure that the “System” selection switch is in the “Off” position and the “Fan” selection switc h for Constant V olume or SZ VAV units is in the “Auto” position.

Close the main power disconnect switch and the unit mounted disconnect switch, if applicable.

Startup

WARNING

Live Electrical Components!

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK HTB1 OR UNIT DISCONNECT SWITCH.

Upon power initialization, the RTRM performs selfdiagnostic checks to insure that all internal controls are functional. It also checks the config uration parameters against the components connected to the system. The LED located on the RTRM module is turned “On” within one second of power-up if internal operation is okay. The economizer dampers are driven open for 5 seconds then fully closed (if applicable). When an economizer is installed DO NOT ENTER the TEST mode until all calibration startup functions have been completed. Otherwise, the economizer actuator and power exhaust output may not function properly during any of the test mode steps. Allow 2 minutes after unit power up to complete economizer calibration before entering the test mode function. Use the following “Test” procedure to bypass some time delays and to start the unit at the control panel. Each step of unit operation can be activated individually by temporarily shorting across the “T est” terminals for two to three seconds. The LED located on the RTRM module will blink when the test mode has been initiated. The unit can be left in any “Test” step for up to one hour before it will automatically terminate, or it can be terminated by opening the main power disconnect switc h. Once the test mode has been terminated, the LED will glow continuously and the unit will revert to the “System” control, i.e. zone temperature for constant volume un its or discharge air temperature for variable air volume units.

Test Modes

There are three methods in which the “Test” mode can be cycled at LTB1-Test 1 and LTB1-Test 2.

1. Step Test Mode - This method initiates the different components of the unit, one at a time, by temporarily shorting across the two test terminals for two to three seconds.

For the initial startup of either a Constant Volume or Variable Air Volume (Single Zone or Traditional) unit, this method allows the technician to cycle a component “ on” and have up to on e hour to complete the check.

2. Resistance Test Mode - This method can be used for startup providing a decade bo x for variable resistance

RT-SVX34H-EN 63

Startup

outputs is available. This method initiates the different components of the unit, one at a time, when a specific resistance value is placed across the two test terminals. The unit will remain in the specific test mode for approximately one hour even though the resistance is left on the test terminals.

3. Auto Test Mode - This method is not recommended for startup due to the short timing between individual component steps. This method initiates the different components of the unit, one at a time, when a jumper is installed across the test terminals. The unit will start the first test step and change to the next step every 30 seconds. At the end of the test mode, control of the unit will automatically revert to the applied “System” control method.

For Constant Vo lume or Variable Air Volume test steps, test modes, and step resistance values to cycle the various components, refer to Table 38, p. 65 - Table 43, p. 67.

Service Test Switch Location

A toggle service switch has been offered as a standard option to provide hassle free startup option for the service person in the field. This toggle switch is located in the low voltage section of the control box.

Table 37. Service test switch

64 RT-SVX34H-EN

Table 38. Test mode states for traditional VAV units with modulating dehumidification and staged heat

Startup

TEST STEP MODE FAN VFD COMMAND1ECON

COMP 1COMP 2COMP 3HEAT 1HEAT

2PUMPOUT

COOL

VALVE

REHEAT

VALVE

VAV

BOX

1 VFD SIGNAL 100% OFF 100% (10VDC) CLOSED OFF OFF OFF OFF OFF OFF 100% 0% ON 2 VFD SIGNAL 0% OFF 0% (0 VDC) CLOSED OFF OFF OFF OFF OFF OFF 100% 0% ON 3 MIN VENT ON IN-CONTROL MIN OFF OFF OFF OFF OFF OFF 100% 0% ON 4 ECON TEST OPEN ON IN-CONTROL OPEN OFF OFF OFF OFF OFF OFF 100% 0% ON 5 COOL 1 ON IN-CONTROL MIN ON OFF OFF OFF OFF IN-CONTROL 100% 0% ON

6 COOL 2

ON IN-CONTROL MIN ON2ON2OFF OFF OFF IN-CONTROL 100% 0% ON 7 COOL 3 ON IN-CONTROL MIN ON ON ON OFF OFF IN-CONTROL 100% 0% ON 8 REHEAT ON IN-CONTROL MIN ON ON ON OFF OFF IN-CONTROL 50% 50% ON 9 HEAT 1 ON IN-CONTROL MIN OFF OFF OFF ON OFF OFF 100% 0% ON

10 HEAT 2 ON IN-CONTROL MIN OFF OFF OFF ON ON OFF 100% 0% ON 11 RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For Traditional VAV units, the VFD Command when “In-Control” will be controlled based on Supply Air Pressure Requirements. For SZ VAV units, the

VFD Command will be at discrete points during Test Mode.

2. For 27.5-35T units, both compressors will be energized during the Cool 2 Step. For 40-50T units, only Compressor 2 will be energized during the Cool 2 Step.

3. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

4. For units with Statitrac installed, the Exhaust Damper will track the Economizer position during Service Test Mode and the Exhaust Fan will be

energized once the Economizer rises above the Exhaust Enable Setpoint.

5. Heating will not be energized during Service Test until the 6 minute VAV Box ON timer has expired.

Notes: 5 Stage High Efficiency Units:

Compressor 1 is the smaller compressor on the circuit. Condenser fans are controlled as defined for normal operation. Exhaust fan operates as defined for normal operation based on economizer position. When Compressor 1 is energized with either C1, C2, or with both for 30 minutes continuously, C3 will be required to de-energize for 30 seconds.

Table 39. Test mode states for CV units with modulating dehumidification and staged heat

TEST

STEP MODE FAN ECON

1 FAN ON ON MIN OFF OFF OFF OFF OFF OFF 100% 0% ON 2 ECONOMIZER ON OPEN OFF OFF OFF OFF OFF OFF 100% 0% ON 3 COOL 1 ON MIN ON OFF OFF OFF OFF IN-CONTROL 100% 0% ON

4 COOL 2

ON MIN ON1ON1OFF OFF OFF IN-CONTROL 100% 0% ON 5 COOL 3 ON MIN ON ON ON OFF OFF IN-CONTROL 100% 0% ON 6 REHEAT ON MIN ON ON ON OFF OFF IN-CONTROL 50% 50% ON 7 HEAT 1 ON MIN OFF OFF OFF ON OFF OFF 100% 0% ON 8 HEAT 2 ON MIN OFF OFF OFF ON ON OFF 100% 0% ON 9 RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For 27.5-35T units, both compressors will be energized during the Cool 2 Step. For 40-50T units, only Compressor 2 will be ener gized during the

Cool 2 Step.

2. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

3. For units with Statitrac installed, the Exhaust Damper will track the Economizer position during Service Test Mode and the Exhaust Fan will be

energized once the Economizer rises above the Exhaust Enable Setpoint.

4. Heating will not be energized during Service Test until the 6 minute VAV Box ON timer has expired.

Notes: 5 Stage High Efficiency Units:

COMP 1COMP 2COMP 3HEAT 1HEAT

2PUMPOUT

COOL

VALVE

REHEAT

VALVE VAV BOX

RT-SVX34H-EN 65

Startup

Table 40. Test mode states for SZ VAV units with modulating dehum id ifi cati on and staged heat

TEST STEP MODE FAN VFD COMMAND

ECON

COMP 1COMP 2COMP 3HEAT 1HEAT

2PUMPOUT

COOL

VALVE

REHEAT

VALVE

1 FAN ON ON 45% (0 VDC) MIN OFF OFF OFF OFF OFF OFF 100% 0% 2 ECONOMIZER ON 45% (0 VDC) OPEN OFF OFF OFF OFF OFF OFF 100% 0% 3 COOL 1 ON 80% (6.67 VDC) MIN ON OFF OFF OFF OFF IN-CONTROL 100% 0%

4COOL 2

ON IN-CONTROL MIN ON2ON2OFF OFF OFF IN-CONTROL 100% 0% 5 COOL 3 ON IN-CONTROL MIN ON ON ON OFF OFF IN-CONTROL 100% 0% 6 REHEAT ON 73% (5.24 VDC) MIN ON ON ON OFF OFF IN-CONTROL 50% 50% 7 HEAT 1 ON 100% (10 VDC) MIN OFF OFF OFF ON OFF OFF 100% 0% 8 HEAT 2 ON 100% (10 VDC) MIN OFF OFF OFF ON ON OFF 100% 0% 9RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For Traditional VAV units, the VFD Command when “In-Control” will be controlled based on Supply Air Pressure Requirements. For SZ VAV units, the

VFD Command will be at discrete points during Test Mode.

2. For 27.5-35T units, both compressors will be energized during the Cool 2 Step. For 40-50T units, only Compressor 2 will be energized during the Cool 2 Step.

3. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

4. For units with Statitr ac installed, the Exhaust Dampe r will tr ack the Economizer position during Service Test Mode and the Exhaust Fan will be energized

once the Economizer rises above the Exhaust Enable Setpoint.

Notes: 5 Stage High Efficiency Units:

Table 41. Test mode states for traditional VAV units with modulating dehumidification and modulating heat

TEST STEP MODE FAN VFD COMMAND1ECON

1 VFD SIGNAL 100% OFF 100% (10VDC) CLOSED OFF OFF OFF OFF OFF 100% 0% ON 2 VFD SIGNAL 0% OFF 0% (0 VDC) CLOSED OFF OFF OFF OFF OFF 100% 0% ON 3 MIN VENT ON IN-CONTROL MIN OFF OFF OFF OFF OFF 100% 0% ON 4 ECON TEST OPEN ON IN-CONTROL OPEN OFF OFF OFF OFF OFF 100% 0% ON 5 COOL 1 ON IN-CONTROL MIN ON OFF OFF OFF IN-CONTROL 100% 0% ON

6COOL 2

ON IN-CONTROL MIN ON2ON2OFF OFF IN-CONTROL 100% 0% ON 7 COOL 3 ON IN-CONTROL MIN ON ON ON OFF IN-CONTROL 100% 0% ON 8 REHEAT ON IN-CONTROL MIN ON ON ON OFF IN-CONTROL 50% 50% ON 9 HEAT 1 ON IN-CONTROL MIN OFF O FF OFF 50% OFF 100% 0% ON

10 HEAT 2 ON IN-CONTROL MIN OFF OFF OFF 100% OFF 100% 0% ON 11 RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For Traditional VAV un its, the VF D Comm and wh en “In -Co ntrol ” wi ll be controlled based on Supply Air Pressure Requirements. For SZ VAV units,

the VFD Command will be at discrete points during Test Mode.

2. For 27.5-35T units, both compressors will be energized during the Cool 2 Step. For 40-50T units, only Compressor 2 will be energized during the Cool 2 Step.

3. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

4. For units with Statitrac installed, the Exhaust Damper will track the Economizer position during Service Test Mode and the Exhaust Fan will be

energized once the Economizer rises above the Exhaust Enable Setpoint.

5. Heating will not be energized during Service Test until the 6 minute VAV Box ON timer has expired.

Notes: 5 Stage High Efficiency Units:

COMP 1COMP 2COMP 3HEAT

OUTPUT PUMPOUT

COOL

VALVE

REHEAT

VALVE

VAV

BOX

66 RT-SVX34H-EN

Table 42. Test mode states for CV units with modulating dehumidification and modulating heat

Startup

TEST STEP MODE FAN ECON

COMP 1COMP 2COMP 3HEAT

OUTPUT PUMPOUT

COOL

VALVE

REHEAT

VALVE VAV BOX

1 FAN ON ON MIN OFF OFF OFF OFF OFF 100% 0% ON 2 ECONOMIZER ON OPEN OFF OFF OFF OFF OFF 100% 0% ON 3 COOL 1 ON MIN ON OFF OFF OFF IN-CONTROL 100% 0% ON

4COOL 2

ON MIN ON1ON1OFF OFF IN-CONTROL 100% 0% ON 5 COOL 3 ON MIN ON ON ON OFF IN-CONTROL 100% 0% ON 6 REHEAT O N MIN ON ON ON OFF IN-CONTROL 50% 50% ON 7 HEAT 1 ON MIN OFF OFF OFF 50% OFF 100% 0% ON 8 HEAT 2 ON MIN OFF OFF OFF 100% OFF 100% 0% ON 9RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For 27.5-35T units, both compress ors wi ll b e ene rgi z ed durin g the Coo l 2 Step . For 40-50T units, only Compressor 2 will be energized during

the Cool 2 Step.

2. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

3. For units with Statitra c installe d, the Exhaus t Damper will track th e Economiz er positio n during Service Test Mode and the Exhaust Fan will be

energized once the Economizer rises above the Exhaust Enable Setpoint.

4. Heating will not be energized during Service Test until the 6 minute VAV Box ON timer has expired.

Notes: 5 Stage High Efficiency Units:

Table 43. Test mode states for SZ VAV units with modulating dehumidification and modulating heat

TEST STEP MODE FAN VFD COMMAND1ECON

1 FAN ON ON 45% (0 VDC) MIN OFF OFF OFF 0% OFF 100% 0% 2 ECONOMIZER ON 45% (0 VDC) OPEN OFF OFF OFF 0% OFF 100% 0% 3 COOL 1 ON 80% (6.67 VDC) MIN ON OFF OFF 0% IN-CONTROL 100% 0%

4COOL 2

ON IN-CONTROL MIN ON2ON2OFF 0% IN-CONTROL 100% 0%

5 COOL 3 ON IN-CONTROL MIN ON ON ON 0% IN-CONTROL 100% 0% 6 REHEAT ON 73% (5.24 VDC) MIN ON ON ON 0% IN-CONTROL 50% 50% 7 HEAT 1 ON 100% (10 VDC) MIN OFF OFF OFF 50% OFF 100% 0% 8 HEAT 2 ON 100% (10 VDC) MIN OFF OFF OFF 100% OFF 100% 0% 9RESET

Notes: 2 & 3 Stage Standard Efficiency Units:

1. For Traditional VAV units, the VFD Command when “In-Control” will be controlled based on Supply Air Pressure Requirements. For SZ VAV units,

the VFD Command will be at discrete points during Test Mode.

2. For 27.5-35T units, both compressors will be energized during the Cool 2 Step. For 40-50T units, only Compressor 2 will be energized during the Cool 2 Step.

3. The Reheat Pumpout relay will be energized any time the Reheat circuit is energized in active Cooling Mode.

4. For units with Statitrac installed, the Exhaust Damper will track the Economizer position during Service Test Mode and the Exhaust Fan will be

energized once the Economizer rises above the Exhaust Enable Setpoint.

Notes: 5 Stage High Efficiency Units:

COMP 1COMP 2COMP 3HEAT

OUTPUT PUMPOUT

COOL

VALVE

REHEAT

VALVE

RT-SVX34H-EN 67

Startup

Actual Motor Amps

Motor Nameplate Amps

----------------------------- -------------------------------------------

Motor HP Theoretical BHP =r

Verifying Proper Fan Rotation

WARNING

Rotating Components!

The following pr ocedur e inv olv es wor kin g with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions could result in rotating components cutting and slashing te chnician which could result in death or serious injury.

Using Table 38, p. 65 to Table 43, p. 67 as a reference, momentarily jump across the test terminals to start the Minimum Ventilation Test.

The Exhaust Fan will start anytime the economiz er damper position is equal to or greater than the exhaust fan setpoint.

The economizer will drive to the minimum position setpoint, exhaust fans may start at random, and the supply fan will start.

Once the supply fan has started, c hec k for proper rotation. The direction of rotation is indicated by an arrow on the fan housing.

If the fan is rotating backwards, open the main power disconnect switch upstream of the unit terminal block or the unit factory mounted disconnect switch.

Verifying Proper Air Flow (CFM) - CV or VFD's

1 . All systems - Set the minimum position set ting for the

economizer to 0º using the setpoint potentiometer located on the Economizer Actuator in the return section with the supply fan “On” and rotating in the proper direction:

CV applications - Measure the amperage at the supply fan contactor and compare it with the full load amp (FLA) rating stamped on the motor nameplate.

VFD's - With the O/A dampers fully closed, read the amperage displayed on the VFD screen and compare it to the motor nameplate.

Note: On VA V applications, the VFD will be under co ntrol

of the discharge Static Pressure setpoint for the first six minutes of this test mode. Verify that the VFD output is at 60 Hz before measuring the fan motor amps.

If the actual amperage exceeds the nameplate value, static pressure is less than design and air flow is too high. If the actual amperage is below the nameplate value, static pressure is greater than design and air flow is too low.

2. To determine the actual CFM (within + 5%), plot the fan's operating RPM and the Theoretical BHP onto the appropriate Fan Performance Curve in and Figure 49, p. 69.

Theoretical BHP Formula:

Figure 48, p. 69

WARNING

Hazardous Voltage!

Interchange any two of the field connected power wires at the unit terminal block or factory mounted disconnect switch.

Note: Interchanging “Load” side power wires at the

supply fan contactor will only affect the Fan Rotation. Ensure that the voltage phase sequence at the main unit terminal bloc k or the unit mounted disconnect switc h is ABC as outlin ed in “Electrical

Phasing,” p. 62.

Where the two points intersect, read straight down to the CFM line. Use Table 45, p. 71 to select a new fan drive if the CFM is not within specifications.

68 RT-SVX34H-EN

Figure 48. Supply fan performance curves 27.5 - 35 ton — 60Hz

0 2000 4000 6 000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Supply Fan Performance 27-35T

10 HP

7.5 HP

5 HP

Volumetric Airflow Rate(CFM)

Stati c Presure(In WC)

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000

0 H

10 HP

7.5 HP

Volumetric Airflow Rate(CFM)

Supply Fan Performance 40 and 50 Ton

Static Presure(InWC)

Startup

Figure 49. Supply fan performance curves 40 and 50 ton — 60Hz

RT-SVX34H-EN 69

Startup

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(0.0)

(125)

(249)

(374)

(498)

(623)

(747)

(872)

(996)

L/S in 1000' s

(0) (.94) (1.89) (2.83) (3.78) (4.72) (5.66) (6.61) (7.55) (8.5) (9.44) (10.38) (11.33) (12.27)

Supply Fan Performance

90%

0% W

OCFM

70%

WOCFM

15 HP

7.5 HP

5 HP

800 RPM

700 RPM

600 RPM

500 RPM

400

RPM

Volumetric Airflow Rate(CFM)

Stat ic Presur e(InWC)

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000

(1245)

(0.0)

(249)

(498)

(747)

(996)

L/S in 1000' s

(0) (.94) (1.89) (2.83) (3.78) (4.72) (5.66) (6.61) (7.55) (8.5) (9.44) (10.38) (11.33) (12.27) (13.22)

WOCFM

80%

OCFM

70%

WOCFM

60%

WOCFM

50%

40%

WOCFM

15 HP

7.5 H

800 RPM

750 RPM

700 RPM

650 RPM

600 RPM

550 RPM

500 RPM

450

400

350

RPM

Volumetric Airflow Rate(CFM)

Supply Fan Perf ormance 40 and 50 Ton

Stat ic Pr esur e(I nWC)

Figure 50. Supply fan performance — 22.9-29.2 Tons — 50Hz

Figure 51. Supply fan performance — 33.3 and 41.7 Ton (IP) — 50Hz

70 RT-SVX34H-EN

Startup

Table 44. TC*/YC* 300 - 600 MBH economizer (R/A) damper pressure drop

Unit

Capacity

27.5

(a)Static Pressure Drops for th e return air dampe r must be added to the system external static pressure as an

accessory when using th e f an p erfo rm ance tabl es and the fa n c urves to d ete rmi ne ac tual fan pe rfor mance.

(b)Pressure Drops are listed in inches of water column.

Airflow

(Cfm)

10000 0.051 11000 0.061 12000 0.073 10500 0.056 11500 0.067 12500 0.095 11000 0.061 12000 0.073 14000 0.103 11500 0.067 12500 0.08 14500 0.111 12000 0.073 13000 0.087 12500 0.08 12000 0.072 12500 0.075 15500 0.104 13000 0.079 16000 0.11 13500 0.083 16500 0.117 14000 0.087 17000 0.124 14500 0.092 17500 0.132 15000 0.098 18000 0.14 15500 0.104 18500 0.149 16000 0.11 19000 0.159 16500 0.117 19500 0.168 17000 0.124 20000 0.179 17500 0.132 18000 0.14

Pressure

Drop

8000 0.035 8000 0.035 9000 0.042 10000 0.051 8500 0.038 9500 0.046 10500 0.056 9000 0.042 10000 0.051 11000 0.061 9500 0.046 10500 0.056 11500 0.067

(b)

Unit

Capacity

Airflow

(Cfm)

15000 0.098

Pressure

Drop

9000 0.042

(b)

Unit

Capacity

Airflow

(Cfm)

10000 0.051

(a)

— 60 Hz

Pressure

(b)

Drop

Table 45. Supply fan drive selection — 60Hz

7.5 HP 10 HP 15 HP 20 HP

Nominal Tons RPM

27.5T

30T

35T

40T

50T

(a)For YC gas/electric only. (b)For TC and TE Cooling and Electric Heat units only.

RT-SVX34H-EN 71

Drive No. RPM

550 A 700 D 600 B 750 650 C 550 A 700 D 600 B 750 E 650 C 600 B 650 C 790

Drive No. RPM

(a)

700 D 800 500 H 625 L 525 J 675 M 575 K 725 N 525 J 625 L 725 N 575 K 675 M

Drive No. RPM

(b)

(a)

Drive No.

Startup

Table 46. Component static pressure drops (in. W.G.)1—60 Hz

Heating System

Standard

Efficiency

Nominal

Tons

27½

Notes:

1. Static pressure drops of accessory components must be added to external static pressure to enter fan selection tables.

2. Throwaway filter option limited to 300 ft/min face velocity.

3. Electric Heaters 36-54 KW contain 1 element; 72-108 KW 2 elements.

Std

Air

8000 0.08 0.06 0.05 0.06 0.12 0.19 0.16 0.25 0.08 0.12 0.11 0.33 0.04 0.08

9000 0.1 0.08 0.07 0.07 0.14 0.22 0.19 0.29 0.09 0.14 0.13 0.39 0.04 0.10 10000 0.13 0.1 0.08 0.09 0.17 0.26 0.23 0.34 0.1 0.16 0.15 0.45 0.05 0.12 11000 0.15 0.12 0.1 0.11 0.20 0.30 0.27 0.39 0.12 0.2 0.17 0.52 0.06 0.14 12000 0.18 0.14 0.12 0.13 0.23 0.34 0.31 0.45 0.14 0.23 0.21 0.59 0.07 0.17 13000 0.21 0.16 0.14 0.15 0.27 0.38 0.35 0.50 0.15 0.26 0.23 0.66 0.09 0.20 10500 0.14 0.11 0.09 0.1 0.25 0.37 0.25 0.37 0.11 0.18 0.16 0.48 0.06 0.13 11500 0.17 0.13 0.11 0.12 0.29 0.42 0.29 0.42 0.13 0.21 0.19 0.55 0.07 0.16 12500 0.2 0.15 0.13 0.14 0.33 0.48 0.33 0.48 0.14 0.24 0.21 0.62 0.08 0.18 13500 0.23 0.18 0.15 0.16 0.38 0.53 0.38 0.53 0.15 0.26 0.23 0.70 0.1 0.22 14500 0.26 0.2 0.18 0.19 0.42 0.59 0.42 0.59 0.17 0.3 0.27 0.77 0.11 0.25 12000 0.01 0.03 0.08 0.13 0.24 0.36 0.30 0.45 0.1 0.19 0.17 0.48 0.07 0.06 13000 0.01 0.04 0.1 0.15 0.28 0.41 0.35 0.51 0.12 0.23 0.2 0.53 0.08 0.07 14000 0.02 0.05 0.11 0.18 0.31 0.46 0.39 0.57 0.13 0.25 0.22 0.59 0.09 0.08 15000 0.02 0.05 0.13 0.2 0.35 0.50 0.44 0.63 0.14 0.28 0.24 0.66 0.1 0.09 16000 0.02 0.06 0.15 0.23 0.39 0.55 0.49 0.69 0.15 0.31 0.27 0.72 0.11 0.10 17000 0.02 0.07 0.17 0.26 0.43 0.60 0.54 0.75 0.17 0.35 0.3 0.79 0.12 0.11 15000 0.02 0.05 0.13 0.2 0.44 0.63 0.44 0.63 0.14 0.28 0.24 0.66 0.1 0.09 16000 0.02 0.06 0.15 0.23 0.49 0.69 0.49 0.69 0.15 0.31 0.27 0.72 0.11 0.10 17000 0.02 0.07 0.17 0.26 0.54 0.75 0.54 0.75 0.17 0.35 0.3 0.79 0.12 0.11 18000 0.03 0.08 0.19 0.29 0.59 0.82 0.59 0.82 0.18 0.38 0.33 0.85 0.14 0.13 19000 0.03 0.08 0.21 0.32 0.65 0.89 0.65 0.89 0.19 0.42 0.35 0.92 0.16 0.14 20000 0.03 0.09 0.23 0.36 0.71 0.96 0.71 0.96 0.2 0.45 0.38 0.99 0.18 0.16

CFM

Gas Heat Electric Heat

ID Coil

High

Efficiency

ID Coil

Throw

-away

High Eff.

Filters

MERV 8

14 High

MERV

Eff.

Economizer

Hot

Gas

Reheat

CoilLow High1 Element2 Elements Dry Wet Dry Wet 2" 2" 4" 4"

72 RT-SVX34H-EN

Table 47. Component static pressure drops in. wg (I-P) — 50 Hz

Startup

Heating System

Standard

Efficiency

Nominal Std Tons

(kW)

23 (80)

25 (88)

29 (103)

33 (118)

42 (146)

Note: Static pressure drops of accessory components must be added to external static pressure to enter fan performance tables.

CFM

Std Air

6670 0.07 0.05 0.04 0.05 0.09 0.14 0.12 0.19 0.05 0.08 0.07 0.20 0.331 0.05 7500 0.08 0.07 0.06 0.06 0.11 0.17 0.14 0.23 0.07 0.11 0.1 0.24 0.04 0.07 8330 0.1 0.08 0.07 0.08 0.13 0.20 0.17 0.26 0.08 0.13 0.12 0.28 0.049 0.08 9170 0.13 0.1 0.08 0.09 0.15 0.23 0.20 0.30 0.09 0.15 0.14 0.32 0.059 0.10

10000 0.15 0.12 0.1 0.11 0.17 0.26 0.23 0.34 0.11 0.18 0.16 0.37 0.07 0.12

7500 0.08 0.07 0.06 0.06 0.11 0.17 0.14 0.23 0.07 0.11 0.1 0.24 0.04 0.07 8330 0.1 0.08 0.07 0.08 0.13 0.20 0.17 0.26 0.08 0.13 0.12 0.28 0.049 0.08 9170 0.13 0.1 0.08 0.09 0.15 0.23 0.20 0.30 0.09 0.15 0.14 0.32 0.059 0.10

10000 0.15 0.12 0.1 0.11 0.17 0.26 0.23 0.34 0.11 0.18 0.17 0.37 0.07 0.12

8750 0.11 0.09 0.08 0.08 0.18 0.28 0.18 0.28 0.09 0.15 0.13 0.30 0.054 0.09

9580 0.14 0.11 0.09 0.1 0.21 0.32 0.21 0.32 0.1 0.17 0.16 0.34 0.065 0.11 11200 0.19 0.15 0.13 0.14 0.28 0.41 0.28 0.41 0.12 0.21 0.19 0.43 0.077 0.15 12100 0.22 0.17 0.15 0.16 0.31 0.46 0.31 0.46 0.13 0.22 0.21 0.48 0.091 0.17 10000 0.01 0.03 0.07 0.11 0.18 0.28 0.22 0.35 0.11 0.18 0.16 0.37 0.070 0.04 10800 0.01 0.03 0.08 0.13 0.20 0.31 0.25 0.39 0.12 0.21 0.18 0.41 0.076 0.05 11700 0.01 0.04 0.1 0.15 0.23 0.35 0.29 0.44 0.13 0.23 0.2 0.46 0.085 0.05 12500 0.01 0.04 0.11 0.17 0.26 0.39 0.32 0.48 0.14 0.26 0.23 0.50 0.096 0.06 13300 0.02 0.05 0.12 0.19 0.29 0.42 0.36 0.53 0.15 0.28 0.25 0.55 0.107 0.07 14200 0.02 0.06 0.14 0.22 0.32 0.46 0.40 0.58 0.17 0.32 0.28 0.61 0.12 0.08 12500 0.01 0.04 0.11 0.17 0.33 0.48 0.33 0.48 0.14 0.26 0.23 0.50 0.095 0.06 13300 0.02 0.05 0.12 0.19 0.36 0.53 0.36 0.53 0.15 0.28 0.25 0.55 0.108 0.07 14200 0.02 0.06 0.16 0.24 0.40 0.58 0.40 0.58 0.17 0.34 0.29 0.61 0.12 0.08 15800 0.02 0.07 0.18 0.27 0.48 0.68 0.48 0.68 0.19 0.38 0.34 0.71 0.136 0.10 16700 0.03 0.08 0.2 0.3 0.53 0.74 0.53 0.74 0.2 0.41 0.36 0.77 0.155 0.11

Gas Heat Electric Heat

Low High1Element2 Elements Dry Wet Dry Wet 2” 2” 4” 4”

ID Coil

High

Efficiency

ID Coil

Throw-

away

Filters

MERV 8

High Eff.

MERV

14 High

Eff.

Economizer

Hot Gas

Reheat

Coil

RT-SVX34H-EN 73

Startup

Table 48. Component static pressure drops Pa (SI) — 50 Hz

Heating System Filters

Nominal Std Tons

(kW)

80 (23)

88 (25)

103 (29)

118 (33)

146 (42)

Note: Static pressure drops of accessory components must be added to external static pressure to enter fan performance tables.

L/s

Std Air

3150 17 1 3 11 12 21 34 12 19 17 38 8

3540 21 1 6 14 15 26 41 17 26 24 45 10

3930 26 2 0 17 19 30 48 19 31 29 50 12

4320 31 2 4 21 23 36 55 22 36 34 57 15

4720 37 2 9 25 27 41 62 26 43 38 65 17

3540 21 1 6 14 15 26 41 17 26 24 45 10

3930 26 2 0 17 19 30 48 19 31 29 50 12

4320 31 2 4 21 23 36 55 22 36 34 57 15

5120 44 3 4 29 32 41 62 26 43 41 67 17

4130 29 2 2 19 21 44 68 22 36 31 55 13

4520 34 2 7 23 25 51 78 24 41 38 62 16

4920 41 3 2 27 29 66 97 29 50 46 77 19

5310 47 3 7 32 34 75 109 31 53 50 86 23

4720 2 7 18 27 43 67 26 43 38 65 17

5120 3 8 21 32 49 75 29 50 43 69 19

5510 3 10 24 37 56 84 31 55 48 77 21

5900 4 11 27 42 62 92 34 62 55 84 24

6290 4 12 31 48 69 101 36 67 60 88 27

6680 5 14 35 54 77 111 41 77 67 98 30

5900 4 11 27 42 78 115 34 62 55 84 24

6290 4 12 31 48 86 126 36 67 60 88 27

6680 5 14 35 54 96 139 41 82 72 100 30

7070 5 16 39 60 115 162 46 91 82 112 34

7470 6 18 44 67 126 176 48 98 86 124 39

Gas Heat Electric Heat ID Coil

Low High1 Element2 Element Dry Wet Adder 50 mm

away

Throw-

MERV 8 High

Eff.

100 mm 100 mm Economizer

MERV14

High Eff

74 RT-SVX34H-EN

Startup

Table 49. Supply air fan drive selections — 50 Hz

7.5 hp (5.6

Nominal

Tons

(kW)

23 (80)

25 (88)

29 (103)

33 (118)

42 (146)

(a) For YC gas/electric only. (b)For TC and TE Cooling only and with electric Heat units only.

kW)

rpm

458A——————

500B——————

541C——————

583—583D————

625 — 625

458A——————

500B——————

541C——————

583—583D————

625—625E————

500B——————

541—541C————

583—583D————

658 — — — 658

664 — — — 664

417—417H————

437—437J ————

479—479K————

521 — — — 521 L — —

562 — — — 562 M — —

604 — — — 604 N — —

437—437J ————

479—479K————

521 — — — 521 L — —

562 — — — 562 M — —

604—————604N

Drive

No rpm

10 hp (7.5

kW)

Drive

No rpm

(a)

E————

15 hp (10

kW)

(b)

(a)

G——

20 hp (15

Drive

No rpm

F——

kW)

Drive

Exhaust Fan Operation

To start the optional power exhaust fans, use the economizer test procedures in Table 38, p. 65 - Table 43,

p. 67 to drive the economizer dampers to the open

position. The exhaust fans will start when the damper position is equal to or greater than the exhaust fan setpoint. If optional power exhaust is selected, an access door must be field-installed on the horizontal return ductwork to provide access to exhaust fan motors.

The exhaust fan will start anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.

WARNING

Rotating Components!

The following pr ocedure involves working with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions could result in rotating components cutting and slashing technician which could result in death or serious injury.

V erify that the fans are oper ating properly and the CFM is within the job specifications. Refer to power exhaust fan performance tables beginning with Table 50, p. 76 for the exhaust fan performance characteristics.

Available power adjustments:

1. The power exhaust fan(s) comes on based on the position of the of the exhaust fan setpoint potentiometer on the RTOM (R eliatel Options Module). The setpoint is factory set at 25%. The exhaust fan(s) will come on anytime the economizer damper po sition is equal to or greater than the active exhaust fan setpoint.

2. Physical damper blade stops limit the amount of exhaust airflow by limiting the maximum opening of the damper blades. These stops (sliding brackets secured with wing-nuts) are present under the rain hood on the non-modulating power exhaust option. There is one stop on each side of each damper. The practical range of blade position control is between 1 .5" and 4.0" blade opening. The dam per is wide-open at 4.0". The stops on each side of a damper must be in the same position, such that the damper blade connecting member contacts the stops at the same time.

3. The modulating power exhaust actuator tracks the position of the economizer damper actuator such that the power exhaust dampers proportionally follow or track the fresh air damper position.

4. When the Statitrac option is selected, the exhaust actuator will operate independently of the economiz er in order to relieve positive building pressure. If a Space Pressure T ransducer failure occurs, the unit will rever t back to fresh air tracking control.

5. The proportional offset between the dampers is adjustable. The adjustment is made under the rain hood by hole position selection on the power exhaust actuator jack shaft on the damper linkage arm

Figure 52, p. 76). With direct-drive ultra-low-leak

( exhaust options, actuator stroke can be adjusted as described in “Economizer Damper Ad justment,” p. 77. The stroke limit can be set between 33% and 100% of full stroke.

RT-SVX34H-EN 75

Startup

Tracking Damper Minimum Adjustment Linkage

Figure 52. Exhaust damper linkage arm

Note: The barometric damper continues to function as a

pressure relief damper up to the maximum stop position.

Note: To adjust the damper blade stops, refer to figures

Figure 53, p. 76 to Figure 56, p. 77.

If the fan speed needs to be ch an ged from the current operating speed, refer to the unit wiring diagram and the XTB1 and XTB2 terminal strip located in the economizer section.

Table 50. Power exhaust fan performance— 27.5-35 Ton

— 60 Hz

Power Exhaust Selection

50% (min) 100% (max)

Return Duct

Static

(in. wc)

0.0 3812 6866 7624 13742

0.1 3497 5296 6995 10591

0.2 3190 4458 6325 9000

0.3 2884 3812 5768 7635

0.4 2621 3359 5241 6719

0.5 2342 2885 4683 5771

Damper Blade Open Distance (in)

(min) (max) (min) (max)

CFM

T able 51. Power exhaust fan perfor mance — 40-50 T on —

60 Hz

0.3 4011 6027 8021 12054

0.4 3718 5526 7436 11051

0.5 3467 5186 6933 10373

Table 52. Power exhaust fan performance — 22.9 - 29.2

Ton — 50 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

Return Duct

Static (Pa)

0.0 1499 2701 2999 5405

24.9 1375 2083 2751 4166

49.8 1255 1753 2488 3540

74.7 1134 1499 2269 3003

99.6 1031 1321 2061 2643

124.5 921 1135 1842 2270

(min) (max) (min) (max)

L/s

Table 53. Power exhaust fan performance — 33.3 - 41.7

Ton — 50 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

Return Duct Static

(Pa)

0.0 1909 3160 3818 6321

24.9 1800 2915 3599 5829

49.8 1676 2537 3364 5308

74.7 1577 2371 3155 4741

99.6 1462 2173 2925 4347

124.5 1364 2040 2727 4080

(min) (max) (min) (max)

L/s

Figure 53. (Upflow) Tracking exhaust damper

adjustment

T able 51. Power exhaust fan perfor mance — 40-50 T on —

Return Duct

Static (in. wc)

76 RT-SVX34H-EN

60 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (in)

(min) (max) (min) (max)

CFM

0.0 4854 8035 9708 16069

0.1 4575 7410 9151 14820

0.2 4262 6450 8552 13496

Startup

Tracking Damper Minimum Adjustment Linkage

Less Exhaust

More Exhaust

Less Exhaust

More Exhaust

Figure 54. (Horizontal) Tracking exhaust damper

adjustment

Figure 55. (Upflow) Standard exhaust maximum

damper position

Figure 56. (Horizontal) Standard exhaust maximum

damper position

Economizer Damper Adjustment

Economizer (O/A) Dampers

Arbitrarily adjusting the outside air dampers to open fully when the return air dampers are fully closed can overload the supply fan motor or deliver higher CFM to the space than designed. This causes higher operating duct static pressures and over pressurization of the space when the unit is operating in the “economizer” mode.

The purpose of adjusting the amount of O/A damper travel is to maintain a balance or equal pressure between the O/A dampers and the pressure drop of the return air system. For models with standard or low-leak economizers, the O/A and R/A damper linkage is attached to a plate with a series of holes that allows the installer or operator to modify the O/A damper travel to compensate for various RA duct losses. Figure 57, p. 77 illustrates the damper assembly and Table 54, p. 78 through Table 57,

p. 78 list the various damper positions based on the air

flow (CFM) and the return duct losses (static pressure) for Downflow and Horizontal units.

To adjust the O/A damper for the correct pressure drop:

1. Measure the return duct static pressure.

2. Enter the calculated CFM from the previous section “V erifying Proper Air flow” return air damper pressure drop.

3. Add the measured return duct static pressure and the return air damper pressu re drop together to obtain the T otal Return Static P ressure. Apply this calculation and the calculated CFM to the appropriate through Table 57, p. 78.

4. Set the drive rod swivel to the appropriate hole according to The units are shipped using hole “A ” with no reference to any specific operating condition.

Figure 57. Economizer (O/A) damper assembly

Table 54, p. 78 through Table 57, p. 78.

Table 44, p. 71 to obtain the

Table 54, p. 78

RT-SVX34H-EN 77

Startup

Table 54. 27.5 - 35 Ton downflow economizer (O/A)

damper static pressure setup

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

8000 B EEEEEE 8500 B D EEEEE

9500 A C EEEEE 10000 A C D EEEE 10500 A C D EEEE 11000 A B D D E E E 11500 A B C D E E E 12000 A A C D E E E 12500 A A C D D E E 13000 A A B B C D E

Return Air Duct Static + Return Air Damper

Static (Inches of Water)

Drive Rod Position

Table 55. 27.5 - 35 Ton horizontal economizer (O/A)

damper static pressure setup

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

8000 A F GGGGG

8500 A F GGGGG

9000 A E GGGGG

9500 A E F GGGG 10000 A D E GGGG 11000 A D E F G G G 11500 A B E F G G G 12000 A A D F G G G 12500 A A D E F G G 13000 A A D E F G G 13500 A A C E F F G 14000 A A C D E F G 14500 A A B D E F F

Return Air Duct Static + Return Air Damper

Static (Inches of Water)

Drive Rod Position

Table 56. 40 - 50 Ton downflow economizer (O/A)

damper static pressure setup

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

12000 A A C D E E E 12500 A A C D D E E 13000 A A B C D E E 13500 A A B C D D E 14000 A A B C C D E 14500 A A B B C D D 15000 AAABCDD 15500 AAABCDD 16000 AAABCCD 16500 AAABBCD 17000 AAABBCC 17500 AAAABCC 18000 AAAABCC 18500 AAAABBC 19000 AAAABBC 19500 AAAABBB 20000 AAAAABB

Return Air Duct Static + Return Air Damper

Static (Inches of Water)

Drive Rod Position

Table 57. 40 - 50 Ton horizontal economizer (O/A)

damper static pressure setup

System Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

12000 A B E F G G G 12500 A B D E F G G 13000 A A D E F G G 13500 A A D E F G G 14000 A A C E F F G 14500 A A C D E F F 15000 A A B D E F F 15500 A A B D E E F 16000 A A A C D E F 16500 A A A C D E F 17000AAABDEE 17500AAABDEE 18000AAABCDE 18500AAAACDE 19000AAAABDE 19500AAAABCE 20000AAAABCD

Return Air Duct Static + Return Air Damper

Static (Inches of Water)

Drive Rod Position

78 RT-SVX34H-EN

Startup

Angle of Rotation Limiter

Scale Shows % of Full Stroke

Actuator for Downow OA Damper

Control Reversing Switch

Must Be Set to Match Spring Return Direction

For Models with Ultra-Low Leak Economizers

The installer can adjust the stroke of the direct drive actuator on the O/A damper to compensate for various R/ A duct losses. Figure 59, p. 79 and Figure 60, p. 79 illustrate the damper & actuator assembly and Table 58,

p. 80 through Table 61, p. 80 list the various O/A actuator

limit positions based on the air flow (CFM) and the return duct losses (static pressure) for Downflow and Horizontal units. The actuator stroke limit can be adjusted between 33% and 100% of full stroke. T o adjust the O/A damper for the correct pressure drop:

1. Measure the return duct static pressure.

2. Enter the calculated CFM from the previous section

“Verifying P roper Air Flow (CFM) - CV or VFD's,” p. 68

to obtain the return air damper pressure drop.

3. Add the measured return duct static pressure and the return air damper pressure drop together to obtain the T otal Return Static P ressure. Apply this calculation and the calculated CFM to the appropriate through Table 61, p. 80.

4. To set the actuator stroke limit: a. Loosen the screw that secures the angle of rotation

limiter on the actuator adjacent to the damper drive shaft clamp.

b. Move the limiter to the desired % open position

and, making sure the limiter teeth are engaged, retighten the screw. (See Figure 58, p. 79).

5. After setting the end stop, the actuator needs to be cycled through its auto-adapt feature to re-scale the control range. With 24 VAC power applied to the actuator, turn the control signal reversing switch forward and back again two times. Within a few seconds, the actuator will cycle itself to the new limiter position and then back to zero. This process may take up to 5 minutes. The actuator will then be set to respond to the 2-10 VDC control signal to cycle within the new range of rotation set by the limiter. Verify that the control signal reversing switch is set back to its original default position - Y = 0 - same direction as spring return. (See

Figure 61, p. 79).

Table 58, p. 80

Figure 59. Actuator for OA damper - Downflow

Figure 60. Actuator for OA damper - horizontal

Actuator for Horizontal OA Damper

Figure 61. Actuator auto-scaling feature details

Figure 58. Actuator stroke limit adjustment

RT-SVX34H-EN 79

Startup

Table 58. 27.5 - 35 Ton downflow economizer (O/A) -

ultra-low leak economizer

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

8000 75 55 55 55 55 55 55 8500 75 60 55 55 55 55 55

9500 100 65 55 55 55 55 55 10000 100 65 60 55 55 55 55 10500 100 65 60 60 55 55 55 11000 100 75 65 60 55 55 55 11500 100 75 65 60 55 55 55 12000 100 100 65 60 55 55 55 12500 100 100 65 60 60 55 55 13000 100 100 75 75 65 60 55

Return Air Duct Static + Return Air Damper

Static (in WC)

stroke limit setting % on OA damper actuator

Table 59. 27.5 - 35 Ton horizontal economizer (O/A) -

ultra-low-leak economizer

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

8000 100 45 40 40 40 40 40

8500 100 45 40 40 40 40 40

9000 100 50 40 40 40 40 40

9500 100 50 45 40 40 40 40 10000 100 60 50 40 40 40 40 11000 100 60 50 45 40 40 40 11500 100 80 50 45 40 40 40 12000 100 100 60 45 40 40 40 12500 100 100 60 50 45 40 40 13000 100 100 60 50 45 40 40 13500 100 100 70 50 45 45 40 14000 100 100 70 60 50 45 40 14500 100 100 80 60 50 45 45

Return Air Duct Static + Return Air Damper

Static (in WC)

stroke limit setting % on OA damper actuator

Table 60. 40 - 50 T on downflow economizer (O/A) - ultra-

low-leak economizer

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

12000 100 100 65 60 55 55 55 12500 100 100 65 60 60 55 55

Return Air Duct Static + Return Air Damper

Static (in WC)

stroke limit setting % on OA damper actuator

Table 60. 40 - 50 T on do wnflow economiz er (O/A) - ultra-

low-leak economizer

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

13000 100 100 75 65 60 55 55 13500 100 100 75 65 60 60 55 14000 100 100 75 65 65 60 55 14500 100 100 75 75 65 60 60 15000 100 100 100 75 65 60 60 15500 100 100 100 75 65 60 60 16000 100 100 100 75 65 65 60 16500 100 100 100 75 75 65 60 17000 100 100 100 75 75 65 65 17500 100 100 100 100 75 65 65 18000 100 100 100 100 75 65 65 18500 100 100 100 100 75 75 65 19000 100 100 100 100 75 75 65 19500 100 100 100 100 75 75 75 20000 100 100 100 100 100 75 75

Return Air Duct Static + Return Air Damper

Static (in WC)

stroke limit setting % on OA damper actuator

Table 61. 40 - 50 T on hor izontal economizer (O/A) - ultr a-

low-leak economizer

System

Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

12000 100 80 50 45 40 40 40 12500 100 80 60 50 45 40 40 13000 100 100 60 50 45 40 40 13500 100 100 60 50 45 40 40 14000 100 100 70 50 45 45 40 14500 100 100 70 60 50 45 45 15000 100 100 80 60 50 45 45 15500 100 100 80 60 50 50 45 16000 100 100 100 70 60 50 45 16500 100 100 100 70 60 50 45 17000 100 100 100 80 60 50 50 17500 100 100 100 80 60 50 50 18000 100 100 100 80 70 60 50 18500 100 100 100 100 70 60 50 19000 100 100 100 100 80 60 50 19500 100 100 100 100 80 70 50 20000 100 100 100 100 80 70 60

Return Air Duct Static + Return Air Damper

Static (in WC)

stroke limit setting % on OA damper actuator

80 RT-SVX34H-EN

Startup

Manual Outside Air Damper

Units ordered with the 25% manual outside air option have two slidable dampers. By adjusting one or both, the desired amount of fresh air entering the system can be obtained.

To adjust the outside air damper;

1. Turn the “System” selection switch to the “Off” position and the “Fan” selection switch (if applicable) to the “Auto” position.

2. Close the disconnect switch or circuit protector switc h that provides the supply power to the unit's power terminal block or the unit factory mounted disconnect switch.

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. F ailure t o follo w all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

terminals one time for constant volume applications, or three consecutive times for a variable air volume application, to start the Minimum Ventilation Test.

6. With the supply fan “On” and rotating in the proper direction, measure the return duct static pressure.

7. U s i n g Table 62, p. 81, enter the desired amount of fresh air and the return air static pressure reading to obtain the proper damper opening dimension.

8. Loosen the adjustment screws on each side of the damper and slide it downward to the required opening.

9. Tighten the adjustment screws and re-install the mist eliminators and the mist eliminator retainer bracket.

10. Open the main power disconnect or the unit mounted disconnect switch to shut the unit off and to reset the RTRM.

11. Before closing the disconnect switch, ensure that the compressor discharge service valve(s), suction service valve(s), and liquid line service valve(s) are backseated.

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK HTB1 OR UNIT DISCONNECT SWITCH.

3. Remove the mist eliminator retainer bracket and the mist eliminators from the fresh air hood.

4. Remove the five (5) screws in the top and bottom of each fresh air damper located inside the hood area.

5. Using the Service Test guide in Table 38, p. 65 -

Table 43, p. 67, momentarily jump across the test

Table 62. Damper adjustment

Damper Opening (In.) Return Air Static Pressure - Inches w.c. Damper #1 Damper #2 -0.20 -0.40 -0.60 -0.80 -1.00 -1.20 -1.40 -1.60

2 0 430 590 725 840 950 1040 1120 740 4 0 780 1080 1330 1545 1730 1890 2035 2170 6 0 1185 1620 1990 2300 2575 2815 3030 3240

8 0 1530 2110 2600 3025 3390 3705 3985 4240 10 0 1930 2655 3270 3800 4250 4650 5005 5345 10 2 2295 3165 3910 4545 5095 5575 6010 6415 10 4 2660 3650 4510 5255 5905 6480 6995 7470 10 6 3010 4150 5130 5965 6690 7330 7900 8440 10 8 3345 4600 5680 6610 7410 8120 8765 9365 10 10 3690 5125 6350 7395 8295 9075 9775 10420

RT-SVX34H-EN 81

Startup

Starting the Compressor

Optional service valves must be fully opened before startup (suction, discharge, liquid line and oil line).

Note: Service valves are standard on high efficiency

units.

NOTICE:

Compressors Failure!

Unit must be powered and crankcase heat ers energiz ed at least 8 hours BEFORE compressors are started. This will protect the compressors from premature failure.

Starting 27.5 to 35 Ton Standard Efficiency Units

Install a set of service gauges onto the suction and discharge service por ts. T o start the compressor test, close the main power disconnect switch or the unit mounted disconnect switch.

Jump across the “Test terminals” on LTB1 or toggle the test switch three consecutive times if it is a constant volume application, or five times if it is a variable air volume application for two to three seconds per jump. Refer to Table 38, p. 65 - Table 43, p. 67 for the Cooling T est sequence.

Important: The compressors are protected from

reverse rotation caused by improper sequencing of the customer supplied unit power wires by the unit phase monitor . It is imperative to verify correct sequencing of compressor power wires to prevent compressor failure from reverse rotation. Refer to the unit wiring schematic and/or wire color markers vs. the compressor terminal block color markers.

Figure 62. Compressor terminal block color markers

If a scroll compressor is rotating backwards, it will not pump and a loud rattling sound can be observed. If allowed to run backward for even a very short period of time, internal compressor damage may occur and compressor life may be reduced. If allowed to run backwards for an extended period of time, the compresso r

will likely fail or the motor windings will overheat and cause the motor winding thermostats to open. The opening of the motor winding thermostat will cause a “compressor trip” diagnostic and stop the compressor.

Starting 40 to 50 Ton Standard Efficiency Units

Install a set of service gauges onto the sucti on and discharge service ports of each circuit. Follow the same procedures as above to start the first stage of compressor operation.

After the compressor and the condenser fans have been operating for approximately 30 minutes, use Table 71,

p. 85 through Table 89, p. 94 to determine the proper

operating pressures for that circuit. Jump across the “Test Terminals” once again. This will

allow the second stage compressors to start. The first stage compressor will shut off providing the 3 minute “On” time has elapsed.

Note: When the second refrigerant circuit is requested to

operate, both compressors of the 50 ton unit will run simultaneously. Verify that the compressors are rotating in the correct direction.

Observe the operation of the compressor(s) and the system operating pressures. After compressors and condenser fans for the circuit have been operating for approximately 30 minutes, use Table 74, p. 86 through

Table 89, p. 94 to determine the proper operating

pressures. For subcooling guidel ines, refer to “Measuring

Subcooling,” p. 97.

Units with Lead/Lag function disabled, jump across the “T est T erminals” once again. This will allow the third stage of cooling (number one circuit) to start providing the 3 minute “Off” time has been satisfied.

Starting 27.5-50 Ton High Efficiency Units

Install a set of service gauges onto the sucti on and discharge service ports of each circuit. Jump across the "Test Terminals" on LTB1 or toggle the test switch three consecutive times if it is a constant volume application, or five times if it is a variable air volume application for two to three seconds per jump in order to get to coolin g stage 1.

Jump across the "Test Terminals" two more times for full load cooling. After the compressor and the condens er fans have been operating for approximately 30 minutes, use

Figure 71, p. 85 through Figure 89, p. 94 to determine the

proper operating pressures for that circuit. For subcooling guidelines, refer to “Measuring

Subcooling,” p. 97.

Line Weights

The standard and high efficiency units use line weights to dampen vibration. Do not remove, relocate, or over -torque these weights. The torque specification for the attaching bolts is 6 ft-lbs ± 1.0 ft-lb.

82 RT-SVX34H-EN

Startup

0.75±0.250.75±0.25

0.75±0.25

0.25±0.25

0.75±0.25

0.25±0.25

0.75±0.25

0.25±0.25

The locations of the line weights are shown in Figure 63,

p. 83, and Figure 70, p. 84.

Figure 63. Line weight locations TE, YC, TC*330, 360, &

420 standard efficiency w/o service valves

Figure 64. Line weight location TE, YC, TC*330, 360, &

420 standard efficiency with service valves

Figure 66. Line weight location TE, YC, TC*400 & 480

standard efficiency with service valv es & TE, YC, TC*480 with reheat valve with service valves

Figure 67. Line weight locations TE, YC, TC*500 & 60 0

standard efficiency w/o service valves

Figure 68. Line weight locations TE, YC, TC*500 & 600

standard efficiency with service valves

Figure 65. Line weight location TE, YC, TC*400

standard efficiency w/o service valves

Figure 69. Line weight lo cation TE, YC, TC*600

standard efficiency reheat with service valves

RT-SVX34H-EN 83

Startup

0.25±0.25

Top View

Figure 70. Line weight location TE, YC, TC*275, 305,

350, 400, & 500 high efficiency

Compressor Oil

Once all of the compressors have been started, verify that the oil level is visible through the sight glass or above the sight glass. Use appropriate lighting (flash light) to verify the presence of oil. A tandem manifold set may have different oil heights, but still must be visible in the sight glass or above the sight glass.

After shutting the compressors off, check the oil’s appearance. Discoloration of the oil indicates that an abnormal condition has occurred. If the oil is dark, overheating may have occurred. Potential causes of overheating: compressor is operating at extremely high condensing temperatures; high superheat; a compressor mechanical failure; or, occurrence of a motor burnout. If the oil is black and contains metal flakes, a mechanical failure has occurred. This symptom is of ten accompanied by a high compressor amperage draw.

Refer to the refrigeration system in the maintenance section for details on testing and replacing oil.

84 RT-SVX34H-EN

Figure 71. 27.5 Ton operating pressure — standard efficiency (60Hz)

TC, TE, YC* 330

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 120 130 14 0 150 16 0 170 180 190 200

Suction Pressure (Ps ig)

Disc ha rge Pr essu re (P sig )

55 F OD Ambient

85 F OD Ambient

7 5 F OD Ambi ent

65 F OD Ambien t

115 F OD Ambient

105 F OD Ambient

95 F OD Ambien t

TC, TE, YC* 360

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 1 20 130 140 150 16 0 170 180 1 90 200

Suction Pressure (Psig)

Disc ha rge Pr essu re (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambient

65 F OD Ambient

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

Startup

68/57 F ID WB/DB

74/62 F ID WB/DB

80/67 F ID WB/DB

86/72 F ID WB/DB

Figure 72. 30 Ton operating pressure — standard efficiency (60 Hz)

68/57 F ID WB/DB

74/62 F ID WB/DB

80/67 F ID WB/DB

86/72 F ID WB/DB

RT-SVX34H-EN 85

Startup

TC, TE, YC* 420

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 1 20 130 14 0 150 16 0 170 180 1 90 200

Suc ti on Pr ess ure (Ps ig)

Discha rge Pr ess u re (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambient

65 F OD Ambient

11 5 F OD A mbient

10 5 F OD Ambi ent

TC, TE, YC* 480 Circ uit #1

Full Load

200

250

300

350

400

450

500

550

600

650

700

100 110 120 130 140 150 160 170 180 190 200

Suction Pressure ( Psig)

Disc ha rge Press ure (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambi ent

65 F OD Ambien t

115 F OD Ambi ent

1 05 F OD Ambien t

95 F OD Ambient

Figure 73. 35 Ton operating pressure — standard efficiency (60 Hz)

68/57 F ID WB/DB

74/62 F ID WB/DB

80/67 F ID WB/D B

86/72 F ID WB/DB

5 F OD Ambient

Figure 74. 40 Ton dual circuit operating pressure — standard efficiency (60 Hz)

86 RT-SVX34H-EN

68/57 F ID WB/DB

74/62 F ID WB/DB

80/67 F I D WB /DB

86/ 72 F ID WB/DB

Figure 75. 40 Ton dual circuit operating pressure — standar d efficiency (60 Hz)

TC, TE, YC* 480 Circuit #2

Full Load

200

250

300

350

400

450

500

550

600

650

700

100 110 1 20 130 140 150 160 170 180 190 200

Suction Pressure (Psig)

Discha rge Pr essu re (P sig)

5 5 F OD Ambi ent

85 F OD Ambient

75 F OD Ambient

65 F OD Ambien t

115 F OD Ambie nt

105 F OD Amb ient

95 F OD Am bient

TC, TE, YC* 600 Circuit # 1

FU LL LO AD

200

250

300

350

400

450

500

550

600

650

700

100 11 0 120 130 140 15 0 160 17 0 180 1 90 200

Sucti o n Pres s u re (P sig)

Discharge Pressure (Psig)

55 F OD Ambient

85 F OD Am bi ent

75 F O D Amb ient

65 F OD Ambi ent

115 F OD Ambient

105 F OD Ambient

95 F OD Ambi ent

Startup

68/57 F I D WB/DB

74/62 F ID WB/DB

80/67 F ID WB/DB

86 /72 F ID WB/ DB

Figure 76. 50 Ton dual circuit operating pressures — standard efficiency (60 Hz)

68/57 F ID WB/DB

74/62 F ID WB/DB

80/67 F ID WB/DB

86/72 F ID WB/DB

RT-SVX34H-EN 87

Startup

TC, TE, YC* 600 Circuit # 2

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 120 130 140 150 160 170 180 1 90 200

Suction Pressure ( Psig)

Disc ha rge Pr essu re (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambi ent

65 F OD Am bient

115 F OD Ambie nt

10 5 F OD Ambi ent

95 F OD Ambient

TC, TE, YC*330 FULL LOAD

Figure 77. 50 Ton dual circuit operating pressures — standard efficiency (60 Hz)

68/57 F ID WB/DB

74 /62 F I D WB/ DB

80/ 67 F ID WB/D B

8 6/72 F I D WB /DB

Figure 78. 27.5 Ton operating pressure — high efficiency (60 Hz)

88 RT-SVX34H-EN

Figure 79. 30 Ton operating pressure — high efficiency (60 Hz)

TC, TE, YC*360 FULL LOAD

TC, TE, YC*420 FULL LOAD

Startup

Figure 80. 35 Ton operating pressure — high efficiency (60 Hz)

RT-SVX34H-EN 89

Startup

TC, TE, YC*480 FULL LOAD

TC, TE, YC*600 FULL LOAD

Figure 81. 40T on oper ating pr essure — high efficiency (60 Hz)

Figure 82. 50T on oper ating pr essure — high efficiency (60 Hz)

90 RT-SVX34H-EN

Figure 83. 22.9 Ton operating pressure — standard efficiency (50 Hz)

TC, TE, YC* 275

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 1 20 130 140 150 160 170 180 190 200

Suction Pressure (Psig)

Disc harge Pr essu re (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambien t

65 F OD Ambi ent

115 F OD Am bient

10 5 F OD A mbient

95 F OD Ambient

TC, TE, YC* 305

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 120 130 14 0 150 16 0 170 180 190 200

Suc tion Pr essure (Psig)

Disc ha rge Pr essu re (P sig)

55 F OD Ambi ent

85 F OD Ambi ent

75 F OD Ambient

65 F OD Ambi ent

11 5 F OD Ambi ent

10 5 F OD Ambi ent

95 F OD Ambi ent

Startup

68/57 F ID WB/DB

74/62 F ID WB/ DB

80/67 F ID W B/DB

86/ 72 F ID WB/D B

Figure 84. 25.4 Ton operating pressure — standard efficiency (50 Hz)

68/57 F ID WB/D B

74/ 62 F ID WB/D B

80/67 F ID WB/DB

86/ 72 F ID WB/ DB

RT-SVX34H-EN 91

Startup

TC, TE, YC* 350

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 1 20 130 14 0 150 16 0 170 180 190 200

Suc ti on Pr ess ure (Ps ig)

Disc ha rge Pr e ssu re (P sig)

55 F OD Ambient

8 5 F OD Ambi ent

75 F OD Ambient

6 5 F OD Ambi ent

115 F OD Ambi ent

105 F OD Ambient

95 F OD Ambi ent

TC, TE, YC* 400 Circuit #1

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 8 00 900 1 000 1100 12 00 1300

Suction Pre ssu r e (KPa)

Discha rge Pr essu re (KPa )

DB /W B

12 .8 F OD Amb ien t

29.4 F OD Ambient

23.9 F OD Ambient

18.3 F OD Ambi ent

46.1 F OD Ambient

40.6 F OD Ambient

35.0 F OD Ambient

DB/WB

Figure 85. 29.2 Ton operating pressures — standard efficiency (50 Hz)

68 /57 F ID WB/ DB

74/62 F ID WB/DB

80/6 7 F ID WB/ DB

86/ 72 F ID WB/ DB

Figure 86. 33.3 Ton dual circuit operating pressure — standard efficiency (50 Hz)

20.0/13.9 C ID

23.3/16.7 C ID

26.7/ 19.4 C ID

30.0/2 2.2 C ID

92 RT-SVX34H-EN

Figure 87. 33.3 Ton dual circuit operating pressure — standard efficiency (50 Hz)

TC, TE, YC* 400 Circ uit #2

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 8 00 900 1000 1100 12 00 1300

Suct ion Pre ssur e (K Pa)

Disc ha rge Pr essu re (KPa )

12. 8 F OD Ambient

29.4 F OD Ambient

23.9 F OD Ambient

18.3 F OD Ambi ent

46.1 F OD Am bient

40.6 F OD Ambi ent

35. 0 F OD Ambien t

DB/ WB

DB /WB

DB/WB

TC, TE, YC* 500 Circ uit #1

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 800 900 1 000 110 0 12 00 1300

Suction Pre ssu r e (K Pa)

Disc ha rge Pr essu re (KPa)

DB/ WB

12.8 F OD Ambient

23.9 F OD Ambient

18 .3 F OD Ambi ent

46. 1 F OD Ambien t

40.6 F OD Ambient

35.0 F OD Ambi ent

DB/WB

DB/ WB

Startup

20.0/13.9 C I D

23.3/1 6.7 C ID

26.7/1 9.4 C ID

30.0/22.2 C ID

Figure 88. 41.7 Ton dual circuit operating pressures — standard efficiency (50 Hz)

26. 7/1 9.4 C ID

20.0/13.9 C ID

23. 3/16.7 C ID

RT-SVX34H-EN 93

30.0/ 22. 2 C ID

9.4 F OD Ambient

Startup

TC, TE, YC* 500 Circuit #2

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 8 00 900 1 000 110 0 1200 1300

Suct ion Pre ssu r e (K Pa)

Discha rge Pr essu re (KPa )

DB/ W B

12 .8 F OD Ambien t

29. 4 F OD Ambi ent

23.9 F OD Ambient

18.3 F OD Amb ie nt

46. 1 F OD Ambi ent

40.6 F OD Ambient

35.0 F OD Ambient

DB/W B

DB/WB

DB/W B

TC, TE, YC*275 FULL LOAD

Figure 89. 41.7 Ton dual circuit operating pressures — standard efficiency (50 Hz)

20. 0/13.9 C ID

23.3 /16.7 C ID

26.7/ 19.4 C ID

Figure 90. 22.9 Ton operating pressure — high efficiency (50 Hz)

30.0 /22.2 C ID

94 RT-SVX34H-EN

Figure 91. 25.4 Ton operating pressure — high efficiency (50 Hz)

TC, TE, YC*305 FULL LOAD

Startup

Figure 92. 29.2 Ton operating pressure — high efficiency (50 Hz)

RT-SVX34H-EN 95

Startup

TC, TE, YC*400 FULL LOAD

TC, TE, YC*500 FULL LOAD

Figure 93. 33.3 Ton operating pressure — high efficiency (50 Hz)

Figure 94. 41.7 Ton operating pressure — high efficiency (50 Hz)

96 RT-SVX34H-EN

Startup

Scroll Compressor Operational Noises

Because the scroll compressor is designed to accommodate liquids (both oil and refrigerant) and solid particles without causing compressor damage, there are some characteristic sounds that dif ferentiate it from those typically associated with a reciprocating compressor. These sounds (which are described below) are characteristic, and do not affect the operation or reliability of the compressor.

At Shutdown

When a Scroll compressor shuts down, the gas within the scroll compressor expands and causes momentary reverse rotation until the discharge check valve closes. This results in a “flutter” type sound.

At Low Ambient Startup

When the compressor starts up under low ambient conditions, the initial flow rate of the compressor is low due to the low condensing pressure. This causes a low differential across the thermal expansion valve that limits its capacity. Under these conditions, it is not unusual to hear the compressor rattle until the suction pressure climbs and the flow rate increases.

During Normal Operation

The scroll compressor emits a higher frequency tone (sound) than a reciprocating compressor.

Compressor Crankcase Heaters

Each compressor is equipped with a crankcase heater. When the compressor is “Off”, the crankcase heater is energized. When the compressor is “On”, the crankcase heater is de-energized. The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the “Off” cycle whic h reduces the potential for refrigerant to migrate into the compressor oil.

If present during a compressor start, liquid refrigerant could damage compressor bearings due to reduced lubrication and eventually could cause compressor mechanical failures.

Prior to the initial start or when power to the unit has been “Of f” for an extended period, allow the crankcase heater to operate a minimum of 8 hours before starting the unit.

Charging by Subcooling

The unit is shipped with a complete refrigerant charge. However, if it becomes necessary to add refrigerant, it should be done so by adding charge to obtain an acceptable subcooling as described below. Refer to the maintenance section for proper refrigerant charging practices.

The outdoor ambient temperature must be between 65° and 105° F and the relative humidity of the air entering the evaporator must be above 40 percent. When the

temperatures are outside of these ranges, measurin g the operating pressures can be meaningless.

With the unit operating at “Full Circui t Cap acity ”, acceptable subcooling ranges between 14° F to 22° F.

Measuring Subcooling

WARNING

R-41 0A Refr iger ant under Higher Pressur e than R-22!

The units described in this manual use R-410A refrigerant which operates at higher pressures than R22 refrigerant. Use ONLY R-410A rated service equipment or components with these units. 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 exploding under R-410A high pressures which could result in death, serious injury, or equipment damage.

1 . At the liquid line service valve, measure the liquid line

pressure. Using a Refrigerant R-410A pressure/ temperature chart, convert the pressure reading into the corresponding saturated temperature.

2. Measure the actual liquid line temperature as close to the liquid line service valve as possible. To ensure an accurate reading, clean the line t horoughly wher e the temperature sensor will be attached. Af ter securing the sensor to the line, insulate the sensor and line to isolate it from the ambient air.

Note: Glass thermometers do not have sufficient contact

area to give an accurate reading.

3. Determine the system subc ooling by subtracting the actual liquid line temperature (measured in step 2) from the saturated liquid temperature (converted in step 1).

Gas Heat Units

Open the main disconnect switch to shut the unit off and to reset the RTRM.

Follow the T est Guide in Table 38, p . 65 - Table 43, p. 67 to start the unit in the heating mode. Jumping the “Test” terminals several times for two to three seconds will be required.

When starting the unit for the first time or servicing the heaters, it is a good practice to start the heater with the main gas supply turned “Off”.

All heating units have either two stage or modulating heat capabilities. The “High” heat models contain two heat exchangers. In staged units, the heat exchangers operate simultaneously at either the low or high fire state. In modulating units, the modulating furnace fires first and adjusts to the needed capacity. If more heat is required

RT-SVX34H-EN 97

Startup

than the modulating can provide, the second bank is fired at full fire and the modulating bank again adjusts to the heating load present.

Check both igniti on systems (if appl icable) when going through the test procedures.

Once the ignition system and ign itors have been c hec ked, open the main power disconnect switch to reset the R TRM.

WARNING

Hazardous Gases and Flammable Vapors!

Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth defects or other reproductive harm. Improper installati on, adjustment, alteration, service or use of this product could cause flammable mixtures and result in a fire. To avoid hazardous gases and flammable vapors follow proper installation and set up of this product and all warnings as provided in this manual. Failure to follow all instructions could result in death or serious injury.

Turn the main gas supply to the unit “On” and check the gas pressure at the unit's gas train. Refer to “Installation

Piping,” p. 38 for the proper gas supply pressure and Figure 34, p. 39 for the location of the gas pressure taps.

Close the main power disconnect switc h and start the first stage heating Test again. Wait approx ima tel y 60 secon ds for the heater to switch to low fire and c heck the manifold gas pressure. The manifold pressure for a two stage burner must be set at negative 0.2" w.c., +/- 0.05" w.c. The manifold pressure on a modulating burner should be set at a positive 0.5" w.c., +/-0.05” w.c. For modulating burners, expect to see the manifold pressure reading fluctuate while the burner is operating, but it should never read negative.

WARNING

Hot Surfaces!

Surface temperat ur es may ex ceed 300°F (150°C) on flue and heat exchanger components. Contact of bare skin on hot surfaces could result in minor to severe burns.

Jump the test terminals momentarily to initiate second stage heat operation. The combustion blower motor should go to high speed. The second stage of heat in un its with modulating gas will initiate the second heater bank to fire and both banks will operate at high fire. The mani fold pressures of the two heater banks in a high heat modulating unit will be different. The pressure setting of the two stage burner will be a negative 0.2" w.c., while the modulating burner will be a positive 0.05" w.c.

Note: When firing a modulating unit for the first time, a

“humming”, or resonance sound may be heard. This is an operational sound made by the burner screen as it burns in. This sound is not a concern unless it persists longer than the first few times the unit is fired.

Electric Heat Units

Start the service test and check the amperage draw for each heat ing stag e. Refer to the heater electrical data in

Table 8, p. 28 (60 Hz) and Table 11, p. 29 (50 Hz) for the full

load amps of a specific heater size. Once the operation of the heaters have been checked,

open the main power disconnect switch or the unit mounted disconnect switch to shut the unit “Off” and to reset the RTRM.

This concludes the setup and testing for the major components and controls within the unit. Fo llow the Test guide in Table 38, p. 65 - Table 43, p. 67 to verify that the optional VFD, economizer actuator, and minimum ventilation controls are functioning.

Final Unit Checkout

After completing all of the checkout and startup procedures outlined in the previous sections (i.e., operating the unit in each of its modes through all available stages of cooling and heating), perform these final checks before leaving the unit:

• Verify that the R TRM is in the normal operation mode. The LED located on the UCP module is “on” and glowing continuously.

For Constant Volume Units

• Verify that the “Mode ” selection switc h and the “Zone T emperature” setpoints are set and/or programmed at the sensor modules.

For Variable Air Volume Units

The RTAM has input setpoint potentiometers inside the control panel that are set at the factory which will allow the unit to operate and maintain system control. For specific job specifications;

• Verify that the control input potentiometers are set according to the job specifications, i.e.;

– Outside air reset temperature - _______ Setpoint – Reset amount °F. - _______ Setpoint – Static pressure - _______ Setpoint – Static pressure deadband - ________ Setpoint – Discharge air temperature - _______Setpoint – Morning warm up temperature - _______

Setpoint

– Exhaust Fan - _______ Setpoint

• Inspect the unit for misplaced tools, hardware and debris.

• Verify that all unit exterior panels—including the control panel doors—are secured in place.

98 RT-SVX34H-EN

For Single Zone Variable Air Volume Units

Verify that the “Mode” selection switch and the “Zone T emperature” setpoints are set and/or programmed at the sensor modules.

The RTOM has input setpoint potentiometers inside the control panel that are set at the factory which will allow the unit to operate and maintain system control. For specific job specifications:

• Verify that the control input potentiometer s are set according to the job specifications:

– DA Heat -_____Setpoint – DA Cool - Fan SPD - _____Setpoint – EXH Fan - _____Setpoint

• Inspect the unit for misplaced tools, hardware and debris.

• Verify that all unit exterior panels—including the control panel doors—are secured in pl ace.

Startup

RT-SVX34H-EN 99

Pre-Installation

The checklist listed below is a summary of the steps required to successfully install a Voyager Commercial rooftop unit. This checklist is intended to acquaint the installing personnel with what is required in the installation process. It does not replace the detailed instructions called out in the applicable sections of this manual.

General Unit Requirements

Downflow/Upflow Models:

• An optional roof curb, specifically designed for the Voyager commercial rooftop units is available from Trane. The roof curb kit must be field assembled and installed according to the latest edition of the curb installation guide.

• Assemble and install the roof curb, including necessary gaskets. Make sure the curb is level.

• Install and secure the ductwork to the curb.

All Units:

• Check unit for shipping damage and material shortage. (Refer to “Unit Inspection,” p. 13).

• Rigging the unit. Refer to Figure 12, p. 20.

• Placing the unit on curb; chec k for levelness. See “Roof

Curb and Ductwork” on page 14.

• Ensure that the unit-to-curb seal is tight and without buckles or cracks.

• Install an appropriate drain line to the evaporator condensate drain connections, as required. Refer to

Figure 14, p. 23.

• Service V a lve Option; S ee “S tar ting the Compressor”

on page 82.

• Return/Fresh-air damper adjustment. Refer to

“Economizer Damper Adjustment” on page 77.

• Exhaust Fan Damper Stop Adjustment. R e fer to Exhaust Damper Adjustment figures, beginning with

Figure 53, p. 76.

Electrical Requirements

WARNING

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, y ou MUS T follo w r equir ements 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.

(See Figure 19, “Typical field power wiring,” on page 26.)

• Verify that the electrical power supply characteristics comply with the unit nameplate specifications.

• Inspect all control panel components; tighten any loose connections.

• Connect properly sized and protected power supply wiring to a field supplied/installed disconnect and unit power terminal block HTB1, or to the optional unitmounted disconnect switch.

• Properly ground the unit.

Field Installed Control Wiring

(Figure 20, p. 32 and Figure 21, p. 33.)

Important: All field-installed wiring must comply with

NEC and applicable local codes.

• Complete the field wiring connections for the constant volume controls as applicable. Refer to the

Voltage Wiring” on page 30 for guidelines.

• Complete the field wiring connections for the variable air volume controls as applicable. Refer to the

Voltage Wiring” on page 30 for guidelines.

“Low

Gas Heat Requirements

(See “Installation Piping” on page 38.)

• Gas supply line properly sized and connected to the unit gas train.

• All gas piping joints properly sealed.

• Drip leg Installed in the gas piping near the unit.

• Gas piping leak ch ecked with a soap s olution. If piping connections to the unit are complete, do not pressurize piping in excess of 0.50 psig or 14 inches w.c. to prevent component failure.

• Main supply gas pressure adequate.

• Flue Tubes clear of any obstructions.

100 RT-SVX34H-EN

Trane Voyager, YC*330B, 360B, 420B, 480B Installation and Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warnings, Cautions and Notices

Table of Contents

Model Number Description

60 Hz Description

50 Hz Description

General Information

Commonly Used Acronyms and Abbreviations

About the Unit

Precautionary Measur es

Unit Inspection

Storage

Unit Dimensions and Weights

Recommended Clearances

Roof Curb and Ductwork

Horizontal Ductwork

Unit Rigging and Placement

Installation General Requirements

Condensate Drain Connection

O/A Sensor & Tubing Installation

Units with Statitrac™

Condensate Overflow Switch

Installation Electrical

Disconnect Switch External Handle (Factory Mounted Option)

Main Power Wiring

Through-the-Base Electrical (Optional Accessory)

Electrical Wire Sizing and Protection Device Equations

Low Voltage Wiring

Control Power Transformer

Field Installed AC Control Wiring

Field Installed DC Control Wiring

Remote Panels and Sensors

Constant Volume and Single Zone VAV Control Options

Variable Air Volume (non-SZ VAV) Control Options

Installation Piping

General Requirements

Connecting the Gas Supply Line to the Furnace Gas Train

Startup

Unit Control Modules

RTRM - ReliaTel™ Refrigeration Module

ECA/RTEM - Economizer A ctuator/ReliaTel Economizer Module (Optional)

EBA - Exhaust Blade Actuator (Optional)

RTAM - ReliaTel Air Handler Module (Standard with Traditional VAV)

ReliaTel Ventilation Module (RTVM)

ReliaTel Dehumidification Module (RTDM)

Conventional Thermostat Connections (Available Only with CV)

LCI - LonTalk® Communication Interface (Optional)

BCI - BACnet® Communication Interface (Optional)

Trane Wireless Comm Interface (WCI)

TD5 Display - 5" Touchscreen Display

TCI - Trane Communication Interface (Optional)

System Operation

Economizer Operation with a Conventional Thermostat (CV Only)

Microelectronic Control Features

Economizer Operation with CV Controls

Modulating Power Exhaust

Mechanical Cooling without an Economizer (CV and SZ VAV)

Zone Temperature - Occupied Cooling (CV and SZ VAV)

Zone Temperature - Occupied Heating (CV and SZ VAV)

Supply Fan (CV and SZ VAV)

Supply Air Tempering (CV and SZ VAV)

Variable Air Volume Applications (Single Zone VAV)

Supply Fan Output Control

Minimum Supply Fan Output

Supply Fan Mode Operation

Setpoint Arbitration

Ventilation Control

Space Pressure Control

Traq Overrides and Special Considerations

Supply Air Temperature Control - Heating and Cooling

Variable Air Volume Applications (Traditional VAV)

Supply Air Temperature Control with an Economizer

VHR Relay Output

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied Cooling

Zone Temperature Control without a Night Setback Panel or ICS - Unoccupied Heating

Morning Warm-up (MWU) Control

Daytime Warm-up (DWU) Control