Trane TCD330B, TCD360B, TCD420B, TCD480B, TCD600B Installation And Maintenance Manual

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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 VAV 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)

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

August 2012 RT-SVX34F-EN

SAFETY WARNING

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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 situation that could result in equipment or property-damage-only accidents.

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

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

appropriate sections throughout this literature. Read these carefully:

WARNING

CAUTIONs

NOTICE:

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

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

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

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. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE.

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

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

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

WARNI NG

Important Environmental Concerns!

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

WARNI NG

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.

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), VAV (Variable Air Volume), and SZ VAV (Single Zone Variable Air Volume) applications. Refer to the table of contents for a listing of specific topics. Refer to “Diagnostics,” p. 104 for troubleshooting information.

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By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage 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-SVX34F-EN (10 August 2012)

• Motors with Internal Shaft Grounding Ring

• Updated Model Number Description, Installation Electrical, Unit Wiring Diagrams

Warnings, Cautions and Notices

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

RT-SVX34F-EN 3

Page 4

Table of Contents

Model Number Description . . . . . . . . . . . . . . . 7

60 Hz Description . . . . . . . . . . . . . . . . . . . . . . 7

50 Hz Description . . . . . . . . . . . . . . . . . . . . . . 9

General Information . . . . . . . . . . . . . . . . . . . . 11

Commonly Used Acronyms and Abbrevia-

tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

About the Unit . . . . . . . . . . . . . . . . . . . . . 11

Precautionary Measures . . . . . . . . . . . . . 12

Unit Inspection . . . . . . . . . . . . . . . . . . . . . 12

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

Recommended Clearances . . . . . . . . . . . . . 13

Roof Curb and Ductwork . . . . . . . . . . . . . . . 13

Horizontal Ductwork . . . . . . . . . . . . . . . . . 13

Unit Rigging and Placement . . . . . . . . . . . 19

Installation General Requirements . . . . . . . 21

Condensate Drain Connection . . . . . . . . . . 21

O/A Sensor & Tubing Installation . . . . . . . 21

Units with Statitrac™ . . . . . . . . . . . . . . . . . 21

Installation Electrical . . . . . . . . . . . . . . . . . . . . 23

Disconnect Switch External Handle (Factory Mounted Option)

. . . . . . . . . . . . . . . . . . . . . 23

Main Power Wiring . . . . . . . . . . . . . . . . . . . 23

Through-the-Base Electrical (Optional Acces-

sory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Electrical Wire Sizing and Protection Device Equations

Low Voltage Wiring . . . . . . . . . . . . . . . . . 28

Control Power Transformer . . . . . . . . . . . 28

Field Installed AC Control Wiring . . . . . . 28

Field Installed DC Control Wiring . . . . . . 29

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

Remote Panels and Sensors . . . . . . . . . . . 32

Constant Volume and Single Zone VAV Con-

trol Options . . . . . . . . . . . . . . . . . . . . . . . . 32

Variable Air Volume (non-SZ VAV) Control

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Installation Piping . . . . . . . . . . . . . . . . . . . . . . 36

General Requirements . . . . . . . . . . . . . . . . 36

Connecting the Gas Supply Line to the Fur-

nace Gas Train . . . . . . . . . . . . . . . . . . . . . 36

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Unit Control Modules . . . . . . . . . . . . . . . . . .38

RTRM - ReliaTel Refrigeration Module . . .38

ECA - Economizer Actuator (Optional) . . .38

PEA - Power Exhaust Actuator (Optional) 38

RTAM - ReliaTel Air Handler Module (Stan-

dard with Traditional VAV) . . . . . . . . . . . .38

Conventional Thermostat Connections

(Available Only with CV) . . . . . . . . . . . . . .39

TCI - Trane Communication Interface (Option-

al) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

LCI - LonTalk® Communication Interface (Op-

tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

BCI - BACnet® Communication Interface (Op-

tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Manual Motor Protectors (380V Through

575V Only) . . . . . . . . . . . . . . . . . . . . . . . . .40

System Operation . . . . . . . . . . . . . . . . . . . . .40

Economizer Operation with a Conventional

Thermostat (CV Only) . . . . . . . . . . . . . . . .40

Microelectronic Control Features . . . . . . .40

Economizer Operation with CV Controls .41

Modulating Power Exhaust . . . . . . . . . . . .41

Mechanical Cooling without an Economizer

(CV and SZ VAV) . . . . . . . . . . . . . . . . . . . . 42

Zone Temperature - Occupied Cooling (CV

and SZ VAV) . . . . . . . . . . . . . . . . . . . . . . . .42

Zone Temperature - Occupied Heating (CV

and SZ VAV) . . . . . . . . . . . . . . . . . . . . . . . .42

Supply Fan (CV and SZ VAV) . . . . . . . . . .42

Supply Air Tempering (CV and SZ VAV) .42

Variable Air Volume Applications (Single Zone VAV)

Supply Fan Output Control . . . . . . . . . . . .43

Minimum Supply Fan Output . . . . . . . . . .43

Supply Fan Mode Operation . . . . . . . . . . .43

Setpoint Arbitration . . . . . . . . . . . . . . . . . .44

Ventilation Control . . . . . . . . . . . . . . . . . . .44

Space Pressure Control . . . . . . . . . . . . . . .46

Supply Air Temperature Control - Heating

and Cooling . . . . . . . . . . . . . . . . . . . . . . . . 46

. . . . . . . . . . . . . . . . . . . . . . . . . . . .43

4 RT-SVX34F-EN

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Table of Contents

Variable Air Volume Applications (Traditional VAV)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Supply Air Temperature Control - Occupied

Cooling and Heating . . . . . . . . . . . . . . . . 47

Supply Air Temperature Control with an

Economizer . . . . . . . . . . . . . . . . . . . . . . . . 47

VHR Relay Output . . . . . . . . . . . . . . . . . . . 47

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

Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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

Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Morning Warm-up (MWU) Control . . . . . 47

Daytime Warm-up (DWU) Control . . . . . 47

Supply Duct Static Pressure Control . . . 48

Supply Air Temperature Reset . . . . . . . . 48

VAV Supply Air Tempering (Only Available

with Modulating Gas Heat) . . . . . . . . . . . 48

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

Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Zone Temperature - Unoccupied Cooling (CV

or SZ VAV Only) . . . . . . . . . . . . . . . . . . . . 49

Zone Temperature - Unoccupied Heating 49

Mechanical Cooling with an Economizer 49

Gas Heat Control . . . . . . . . . . . . . . . . . . . 49

Electric Heat Control . . . . . . . . . . . . . . . . 50

Clogged Filter Option . . . . . . . . . . . . . . . . 50

Ventilation Override . . . . . . . . . . . . . . . . . 50

Emergency Stop . . . . . . . . . . . . . . . . . . . . 50

Phase Monitor . . . . . . . . . . . . . . . . . . . . . 50

Low Pressure Control . . . . . . . . . . . . . . . . 51

Dehumidification Low Pressure Control . 51

High Pressure Cutout and Temperature Dis-

charge Limit . . . . . . . . . . . . . . . . . . . . . . . 51

Power Exhaust Control (Standard) . . . . . 51

Space Pressure Control - Statitrac . . . . . 51

Power Exhaust Control (Tracking) . . . . . 52

Lead/Lag Control . . . . . . . . . . . . . . . . . . . 52

Coil Frost Protection . . . . . . . . . . . . . . . . . 52

Dehumidification Frost Protection . . . . . 52

VFD Programming Parameters . . . . . . . . 52

. . . 49

Condenser Fan Sequencing Control . . . . .52

Preparing the Unit for Operation . . . . . . . .53

Electrical Phasing . . . . . . . . . . . . . . . . . . . .54

Voltage Supply and Voltage Imbalance . .54

Starting the Unit . . . . . . . . . . . . . . . . . . . . . . .55

Test Modes . . . . . . . . . . . . . . . . . . . . . . . . .55

Verifying Proper Fan Rotation . . . . . . . . . .59

Verifying Proper Air Flow (CFM) - 

CV or VFD's . . . . . . . . . . . . . . . . . . . . . . . . .59

Exhaust Fan Operation . . . . . . . . . . . . . . .72

Economizer Damper Adjustment . . . . . . . .74

Economizer (O/A) Dampers . . . . . . . . . . . .74

Manual Fresh Air Damper . . . . . . . . . . . . .75

Starting the Compressor . . . . . . . . . . . . . . .76

Starting 27.5 to 35 Ton Units . . . . . . . . . . 76

Starting 40 to 50 Ton Units . . . . . . . . . . . . 76

Compressor Oil . . . . . . . . . . . . . . . . . . . . .77

Scroll Compressor Operational Noises . .85

Compressor Crankcase Heaters . . . . . . . .85

Charging by Subcooling . . . . . . . . . . . . . .85

Measuring Subcooling . . . . . . . . . . . . . . .85

Gas Heat Units . . . . . . . . . . . . . . . . . . . . . . . . 85

Electric Heat Units . . . . . . . . . . . . . . . . . . . . .86

Final Unit Checkout . . . . . . . . . . . . . . . . . . . .86

For Constant Volume Units . . . . . . . . . . . .86

For Variable Air Volume Units . . . . . . . . .86

For Single Zone Variable Air Volume 

Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . .88

General Unit Requirements . . . . . . . . . . . . .88

Downflow/Upflow Models: . . . . . . . . . . . .88

All Units: . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Electrical Requirements . . . . . . . . . . . . . . . .88

Field Installed Control Wiring . . . . . . . . . . 88

Gas Heat Requirements . . . . . . . . . . . . . . . .88

Sequence of Operation . . . . . . . . . . . . . . . . . . .89

Mechanical Cooling Sequence  Of Operation

Units Without an Economizer . . . . . . . . . .89

Economizer Operation Based on Dry Bulb 89

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

RT-SVX34F-EN 5

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Table of Contents

Economizer Operation Based on Reference

Enthalpy . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Economizer Operation Based on Compara-

tive Enthalpy . . . . . . . . . . . . . . . . . . . . . . . 90

Dehumidification (Modulating Hot Gas Reheat) Sequence of Operation

. . . . . . . . . . . 90

Gas Heat Sequence Of Operation . . . . . . . 91

Constant Volume (CV) Unit Fan Operation 91

Variable Air Volume (VAV) Unit Fan Operation (2 Stage and Modulating Gas Heat) 91

Variable Air Volume (VAV) Unit Fan Opera-

tion (Modulating Gas Heat Only) . . . . . . 92

Ignition Control Module . . . . . . . . . . . . . . 92

High Temperature Limit Operation and Loca-

tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Electric Heat Sequence Of Operation . . . . 92

Constant Volume (CV) . . . . . . . . . . . . . . . 92

Variable Air Volume (VAV) . . . . . . . . . . . 92

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

Occupied Cooling Operation . . . . . . . . . . 92

Occupied Heating Operation . . . . . . . . . . 93

Unoccupied Cooling and 

Heating Operation . . . . . . . . . . . . . . . . . . 94

Dehumidification Operation . . . . . . . . . . 94

Failure and Overriding Conditions . . . . . 95

. . . . . . 92

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

. . . . . . . . . . . . . . 95

High Pressure Control and Temperature Discharge Limit (ReliaTel Control)

. . . . . . . . . 95

Electrical Phasing . . . . . . . . . . . . . . . . . . .102

Precision Suction Restrictor . . . . . . . . . .102

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

System Status/Diagnostics . . . . . . . . . . . .104

Terminal locations . . . . . . . . . . . . . . . . . . 104

System Status / Diagnostics checkout proce-

dure (DC volt meter required) . . . . . . . . . 104

Diagnostics (CV and SZ VAV Units Only) 105

Diagnostics (VAV only) . . . . . . . . . . . . . .105

Resetting Cooling and Ignition Lockouts 106

Zone Temperature Sensor (ZSM) Service In-

dicator . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

RTRM Zone Sensor Module (ZSM) Tests 107

Programmable & Digital Zone Sensor 

Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

ReliaTel Refrigeration Module (RTRM) .108

Economizer Actuator (ECA) 

Test Procedures . . . . . . . . . . . . . . . . . . . .108

ReliaTel Air Module (RTAM) Tests . . . . .109

ReliaTel Air Module (RTOM) Tests . . . . .110

Compressor—Blink Codes . . . . . . . . . . . .110

Troubleshooting . . . . . . . . . . . . . . . . . . . . . .111

TR-200 VFD Programming Parameters . .116

Unit Wiring Diagram Numbers . . . . . . . . . . .118

Warranty and Liability Clause . . . . . . . . . . . .122

COMMERCIAL EQUIPMENT - 20 TONS AND LARGER AND RELATED ACCESSORIES

.122

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Fan Belt Adjustment . . . . . . . . . . . . . . . . . . 96

Monthly Maintenance . . . . . . . . . . . . . . . . . 98

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Cooling Season . . . . . . . . . . . . . . . . . . . . 98

Heating Season . . . . . . . . . . . . . . . . . . . . 99

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . 100

Fall Restraint . . . . . . . . . . . . . . . . . . . . . . . . 100

Refrigeration System . . . . . . . . . . . . . . . . . 101

Refrigerant Evacuation and Charging . 101

Charge Storage . . . . . . . . . . . . . . . . . . . . 101

Compressor Oil . . . . . . . . . . . . . . . . . . . . 101

Compressor Replacements . . . . . . . . . . . 102

6 RT-SVX34F-EN

Page 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)

Note: The following digits apply to YC

units 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: The following digits apply to TE

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

units only.

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™

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

Digit 13 — Supply Fan Motor, HP

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

Digit 14 — Supply Air Fan Drive

Selections

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

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

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

Digit 18

B = Through the Base Electrical

Provision

Digit 19

C = Non-Fused Disconnect Switch

w/External Handle

RT-SVX34F-EN 7

Page 8

Model Number Description

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

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

*=Unused Digit

Digit 28

M = Stainless Steel Drain Pans

Digit 29 — Condenser Coil Options

0 = Standard Efficiency

Condenser Coil

J = 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

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: (see Tab l e 17,

p. 46 for additional information):

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. VOM is available for the exhaust fan without fresh air tracking power exhaust.

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

8 RT-SVX34F-EN

Page 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™

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

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

Control

Reference Enthalpy Control

Differential Enthalpy Control

Fresh Air Damper

Fresh Air Damper

Digit 16 – System Control

1 = Constant Volume w/ Zone

2 = Constant Volume w/ Discharge 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

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

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

Digit 18

B = Through the Base Electrical

Provision

Digit 19

C = Non-Fused Disconnect Switch

with External Handle



Digit 20

D= Factory-Powered 15A GFI

Convenience Outlet and  Non-Fused Disconnect Switch with External Handle

Digit 21

E = Field-Powered 15A GFI

Convenience Outlet

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

* = Unused Digit

Digit 28

M = Stainless Steel Drain Pans

Digit 29 — Condenser Coil Options

0 = Standard Efficiency 

Condenser Coil

J = Corrosion Protected Condenser

Coil

RT-SVX34F-EN 9

Page 10

Model Number Description

Digit 30-31 — Miscellaneous Options

P = Discharge Temperature Sensor R = Clogged Filter Switch

Digit 32 — Dehumidification Option

T = Modulating Hot Gas Reheat

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-

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.

10 RT-SVX34F-EN

Page 11

General Information

Commonly Used Acronyms and Abbreviations

BAS = Building Automation System PGA = Power Exhaust Actuator

CFM = Cubic Feet per Minute PSIG = Pounds Per Square Inch Gauge pressure

CLV = Cooling Valve (Reheat only) PHM = Phase monitor

COMM = Module Designation for TCI/LCI R/A = Return Air

CV = Constant Volume RAH = Return Air Humidity

CW = Clockwise RAT = Return Air Temperature sensor

CCW = Counterclockwise RH = Right Hand

DSP = Direct Space Pressure control RHP = Reheat Pumpout Solenoid

DTS = Discharge Air Sensor RHV = Reheat Valve

DWU = Daytime Warm-up RLP = Reheat Low Pressure Cutout

E/A = Exhaust Air RPM = Revolutions Per Minute

ECA = Economizer Actuator RTAM = ReliaTel Air Handler Module

EET = Entering Evaporator Temperature Sensor RTDM = ReliaTel Dehumidification Module

F/A = Fresh Air RTVM = ReliaTel Ventilation Module

FFS = Fan Failure Switch RTOM = ReliaTel Options Module

ICS = Integrated Comfort System (See BAS) RTRM = ReliaTel Refrigeration Module

IDM = Indoor Fan Motor S/A = Supply Air

I/O = Input/Output SPC = Space Pressure Calibration Solenoid

IOM =

LCI = LonTalk® Communication Interface SPT = Static Pressure Transducer

LCI-R = LonTalk Communication Interface with ReliaTel SZVAV = Single Zone Variable Air Volume

LH = Left Hand TCI = Trane Communication Interface

MAS = Mixed Air Sensor TCO = Temperature Cutout

MAT = Mixed Air Temperature TDL = Temperature Discharge Limit

MCHE Microchannel VAV = Variable Air Volume

MWU = Morning Warm Up VFD = Variable Frequency Drive

NSB = Night Setback (programmable ZSM BAYSENS119*) VHR = Ventilation Heat Relay (VAV box relay)

O/A = Outside Air W.C. = Water Column

OAH = Outside Air Humidity XFSP = Exhaust Fan Setpoint

OAT = Outside Air Temperature ZSM = Sensor, Zone Sensor, Zone Sensor Module, Zone Panel

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

SPP = Space Pressure Transducer

About the Unit

Overall unit dimensional data is illustrated in Figure 1,

p. 13 to Figure 9, p. 17. 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 with the unit. Acronyms are used extensively throughout this manual when referring to the “Control System”.

RT-SVX34F-EN 11

Basic unit components include:

• Scroll compressors

• One (1) Intertwined Evaporator Coil

• One (1) Supply Fan

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

• One (1) Microchannel Condenser Coil

• Filters (type is dependent on option selection)

Page 12

General Information

Precautionary Measures

WARN ING

Fiberglass Wool!

Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair 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 sleeves and pants when working 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, blowing, 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 affected areas gently with soap and warm water after handling.

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.

Unit Inspection

As soon as the unit arrives at the job site:

• Verify 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 shortages. Figure 11 , p. 18 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.

WARNI NG

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. 38.

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

12 RT-SVX34F-EN

Page 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. 19 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 before 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 only 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 13 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 l ow 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, gaskets

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

RT-SVX34F-EN 13

Page 14

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

40 3/16"

1020.7mm

6 7/8"

174.6mm

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 Tons (TC, TE, YC low heat)

(digit 3 = F or R) see Figure 1, p. 13 for appropriate downflow/upflow dimensions and Figure 2, p. 14 for appropriate horizontal dimensions.

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

14 RT-SVX34F-EN

Page 15

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

1 1/4 (32)

3 1/4 (81)

191

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

Unit Dimensions and Weights

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 4, p. 15 for appropriate downflow/upflow dimensions and Figure 5, p. 15 for appropriate horizontal dimensions.

RT-SVX34F-EN 15

Page 16

Unit Dimensions and Weights

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"

40 3/16"

6 15/16"

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

1020.7mm

174.6mm

1 1/4" [31.7mm]

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

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)

16 RT-SVX34F-EN

Page 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

46 15/16"

1192.2mm

4 3/4"

120.6mm

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. 16 for appropriate downflow/upflow dimensions and Figure 8, p. 17 for appropriate horizontal dimensions.

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

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

RT-SVX34F-EN 17

Page 18

Unit Dimensions and Weights

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

18 RT-SVX34F-EN

Page 19

Unit Dimensions and Weights

Unit Rigging and Placement

WARN ING

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 unit 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. 19.

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

RT-SVX34F-EN 19

Page 20

Unit Dimensions and Weights

DE F

TOP VIEW OF UNIT

COMPRS

CBA

Table 4. Approximate units operating weights — lbs./

Unit

Model

**D330/275 3750 1701 4130 1873 3620 1642 3640 1651

**H330/275 3790 1719 4220 1914 3660 1660 3680 1669

**D360/305 3845 1744 4225 1916 3715 1685 3735 1694

**H360/305 3885 1762 4315 1957 3755 1703 3775 1712

**D420/350 3970 1801 4350 1973 3840 1742 3860 1751

**H420/350 4010 1819 4440 2014 3880 1760 3900 1769

**D480/400 4764 2161 4884 2215 4539 2059 4564 2070

**H480/400 4859 2204 4984 2261 4599 2091 4634 2102

**D600/500 5174 2347 5294 2401 4949 2245 4974 2256

**D600/500 5269 2390 5394 2447 5019 2277 5044 2288

Notes:

1. Basic unit weight includes minimum horsepower supply fan

motor.

Basic Unit Weights

Low HeatYCHigh Heat TC TE

Table 5. Point loading average weight

1,2

— lbs./kg

Model A B C D E F

**D330/275 846 384 688 313 743 337 745 338 604 275 503 228

**H330/275 867 393 707 321 767 348 753 342 613 279 513 233

**D360/305 836 379 680 309 779 353 741 336 621 285 568 258

**H360/305 897 407 696 316 766 348 729 330 590 268 636 288

**D420/350 892 405 692 314 779 353 765 347 633 288 590 268

**H420/350 867 393 869 395 690 313 758 344 601 273 654 297

**D480/400 820 372 856 388 937 425 742 336 762 346 769 349

**H480/400 841 381 876 397 957 434 754 342 775 352 782 355

**D600/500 894 406 955 428 970 440 756 343 862 391 866 393

**H600/500 915 415 966 438 990 449 768 348 875 397 879 399

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.

Table 6. Approximate operating weights1— optional components — lbs./kg

Unit

Model

**D330/275 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**H330/300 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**D360/305 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**H330/305 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**D420/350 110/50 165/74 50/23 260/117 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**H420/350 145/65 200/90 50/23 285/128 85/39 115/52 18/8 6/3 30/14 85/38 310/141 330/150

**D480/400 110/50 165/74 50/23 290/131 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**H480/400 145/65 200/90 50/23 300/135 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**D600/500 110/50 165/74 50/23 290/131 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**H600/500 145/65 200/90 50/23 300/135 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

Note:

1. Basic unit weight includes minimum horsepower supply fan motor.

Baro.

Relief

Power

Exhaust

0-25%

Man

Damper Econ.

20 RT-SVX34F-EN

Var. Freq.

Drives (VFD’s)

Bypass Lo Hi

Valves

Serv

Through-

the base Elec.

Non-

Fused

Discon.

Switch

Factory.

GFI with

Discon.

Switch

Roof CurbW/O With

Page 21

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. 18 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. 21.

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.

Figure 14. Condensate trap installation

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 16, p. 22. There are two tube connectors mounted on the left of the solenoid and transducers. Connect one end of the 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.

Figure 15. Pressure tubing

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 within a customer-specified controlband. Refer to the illustration in Figure 15, p. 21 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.

RT-SVX34F-EN 21

Page 22

Installation General Requirements

Static Reference Tubing Connects Here (O/A Sensor)

Space Pressure Sensing Tube Connects Here

Space Pressure Calibration Solenoid

Space Pressure Transducer

CNO

Sensing Tube to Outside Air Reference

Space Pressure Transducer

Sensing Tube to Space Pressure

Figure 16. Statitrac transducer assembly

22 RT-SVX34F-EN

Page 23

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 switch, allowing the control panel door to be opened.

WARNI NG

Hazardous Voltage!

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

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 locked in the “OFF” position. While holding the handle in the “OFF” position, push the spring loaded thumb key, attached 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 17. Disconnect switch

An overall layout of the field required power wiring is illustrated in Figure 18, p. 24. 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.

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

Main Power Wiring

WARNI NG

Proper Field Wiring and Grounding Required!

1. Table 7, p. 25 and Ta b le 10 , p . 2 6 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 27 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 switch, 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 27 for determining correct size.

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

Figure 1, p. 13. Complete the unit's power wiring

connections onto either the main terminal block HTB1,

“Electrical

RT-SVX34F-EN 23

Page 24

Installation Electrical

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 holes made in the base of 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 18. 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.

24 RT-SVX34F-EN

Page 25

Installation Electrical

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

Fan Motors

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™.

Characteristics

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 50.5 315/315

230/60/3 207-253 2/13 50.5 315/315

460/60/3 414-506 2/13 23.0 158/158

575/60/3 517-633 2/13 19.0 136/136

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

Electrical

Voltage

Range

No/Ton RLA (Ea.) LRA (Ea.) HP FLA No HP

1/12,1/

1/13,1/

2/13,1/

Allowable

Compressor Supply Condenser Exhaust

7.5

44.0/50.5 304/315

21.0/23.0 147/158

17.5/19.0 122/136

50.5/56.0 315/351

23.0/27.5 158/197

19.0/23.0 136/146

50.5/83.9 315/485

23.0/34.0 158/215

19.0/27.3 136/175

50.5/56.0 315/351

23.0/27.5 158/197

19.0/23.0 136/146

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

22.2 3 1.1 7.0 1 2 1.0 4.1

29.5

18.8 3 1.1 7.0 1 2 1.0 4.1

25.2

9.4 3 1.1 3.5 1 2 1.0 1.8

12.6

7.8 3 1.1 2.8 1 2 1.0 1.4

10.1

22.2 3 1.1 7.0 1 2 1.0 4.1

29.5

18.8 3 1.1 7.0 1 2 1.0 4.1

25.2

9.4 3 1.1 3.5 1 2 1.0 1.8

12.6

7.8 3 1.1 2.8 1 2 1.0 1.4

10.1

22.2

29.5

3 1.1 7.0 1 2 1.0 4.1

40.7

18.8

25.2

3 1.1 7.0 1 2 1.0 4.1

35.4

9.4

12.6

3 1.1 3.5 1 2 1.0 1.8

17.7

7.8

10.1

3 1.1 2.8 1 2 1.0 1.4

15.1

29.5 4 1.1 7.0 1 2 1.5 5.4

40.7

25.2 4 1.1 7.0 1 2 1.5 5.4

35.4

12.6 4 1.1 3.5 1 2 1.5 2.7

17.7

10.1 4 1.1 2.8 1 2 1.5 2.2

15.1

29.5

40.7

4 1.1 7.0 1 2 1.5 5.4

56.1

25.2

35.4

4 1.1 7.0 1 2 1.5 5.4

49.4

12.6

17.7

4 1.1 3.5 1 2 1.5 2.7

24.7

10.1

15.1

4 1.1 2.8 1 2 1.5 2.2

19.6

FLA

(Ea.)

50% 100%

FLA

(Ea.)No.

RT-SVX34F-EN 25

Page 26

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

FLA Add Unit Voltage

200 230 460 575

Table 10. Electrical service sizing data — 50Hz

Fan Motors

Compressor

Model

TC/TE/YC*275 380-415/50/3 1/10, 1/11 21.0/23.0 147/ 158 7.5 (5.6)

TC/TE/YC*305 380-415/50/3 2/11 23.0 158 7.5 (5.6)

TC/TE/YC*350 380-415/50/3 1/11, 1/12 23.0/27.5 158/ 197 7.5 (5.6)

TC/TE/YC*400 380-415/50/3 1/11, 1/17 23.0/34.0 158/ 215 10 (6.8)

TC/TE/YC*500 380-415/50/3 2/11, 1/12 23.0/27.5 158/ 197 10 (6.8)

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.

Characteristics

No/Ton

Electrical

RLA

(Ea.)

LRA

(Ea.) HP(kW) FLA No. HP(kW)

Supply Condenser

10 (6.8)

15 (10.5)

20 (12.8)

13.6/

16.0/

13.6/

16.0/

13.6/

16.0/

24.0/

16.0/

24.0/

16.0/

24.0/

29.0/

3 .75 (.56) 4.4 1 2

14.1

15.5

14.1

15.5

14.1

15.5

26.0

15.5

26.0

15.5

26.0

28.0

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

0.75

(0.56)

50% 100%

FLA

(Ea.)

4.4 1 2

Exhaust

(kW)

(0.56)

(0.75)

0.75

1.0

FLA

(Ea.)No.

1.7

2.5

26 RT-SVX34F-EN

Page 27

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 YC (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)

To 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 MCA, MOP and/or RDE values using the 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 which 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-SVX34F-EN 27

Page 28

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 (LOAD3 + 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 various control options available for a Constant Volume application is illustrated in

Figure 19, p. 30 and Figure 20, p. 31 illustrates the various

control options for a Variable Air Volume application. The required number of conductors for each 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 Sensors”. 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

WARN ING

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

WARNI NG

Proper Field Wiring and Grounding Required!

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 any connecting wiring, refer to Tab l e 13 ,

p. 28 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 conductor may

cause component failure due to insufficient AC voltage supply.

• Refer to dimensional information beginning with

Figure 1, p. 13 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 correcting 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

28 RT-SVX34F-EN

Page 29

Installation Electrical

Field Installed DC Control Wiring

WARN ING

Proper Field Wiring and Grounding Required!

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 signal and the unit, refer to Table 14, p. 29 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. 13 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 utilizes a serial communication link;

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

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

RT-SVX34F-EN 29

Page 30

Installation Electrical

LT B6

Space

Humidity

Sensor

Space

Humidistat

RTRM J7 Thermostat Inputs N/A for SZ VAV

Figure 19. Typical field wiring requirements for CV and SZ VAV control options

30 RT-SVX34F-EN

Page 31

Figure 20. 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 21. RTRM zone sensor/thermostat connections

Customer

Changeover

fo r VAV Ht g (MOD GAS

ONLY

Space

Humidity

Sensor

Space

Humidistat

RT-SVX34F-EN 31

Page 32

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 21, p. 31 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.

WARNI NG

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 22. Zone panel (BAYSENS106*)

Figure 23. 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 changeover control with dual setpoint capability. It can be used with a remote zone temperature sensor BAYSENS077*.

Figure 24. Remote panel W/O NSB (BAYSENS110*)

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*.

32 RT-SVX34F-EN

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 AUTO and OFF. Table 15, p. 33 lists the operating sequence should a CV/SZ VAV 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

For unit stand-alone operation without a remote panel or an ICS connected, jumper between terminals J6-2 and J64 on RTRM.

VHR Relay Output

For stand alone VAV unit operation, the VHR output should be wired to drive VAV boxes to maximum position during

Page 33

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 25. 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 Cooling

DWU2 VAV Heating

VAV Cooling

DWU or Cooling VAV Cooling or

Heating

1,2,3,4

Figure 26. Remote panel W/O NSB (BAYSENS021*)

The following Constant Volume or Variable 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 override cancellation. It is used with a Trane Integrated Comfort system.

Figure 27. Remote zone sensor (BAYSENS073*)

building management

The following Variable Air Volume controls are 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 VAV 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 Tem p v s Re s i s t a nce 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-SVX34F-EN 33

Remote Zone Sensor (BAYSENS074*)

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

with a Trane Integrated Comfort

building management

system.

Figure 28. Remote zone sensor (BAYSENS074*)

Page 34

Installation Electrical

Twisted/Shielded Run Shield to terminal 11

RTRM

Remote Zone Sensor (BAYSENS077*)

This electronic sensor can be used with BAYSENS106*, 108*, 110*, 119*, or 021* Remote Panels. When this sensor is wired to a BAYSENS119* Remote Panel, wiring must be 18 AWG Shielded Twisted Pair (Belden 8760 or equivalent). Refer to the specific Remote Panel for wiring 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 setpoint 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 BAYSENS119* 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. 35 for the Temp vs Resistance coefficient if an optional remote sensor is used.

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 approximately 25 degrees F below the cutout setpoint.

Figure 30. High temperature sensor (BAYFRST003*)

Remote Minimum Position Potentiometer (BAYSTAT023*)

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

Figure 31. Remote minimum position potentiometer

(BAYSTAT023)

Figure 29. Remote sensor with night setback

BAYSENS119

34 RT-SVX34F-EN

Page 35

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 32. 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-SVX34F-EN 35

Degrees

F°

Nominal

Resistance

Page 36

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 the gas train located inside the gas heat compartment.

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 installation, adjustment, alteration, service or use of this product could cause flammable mixtures or lead to excessive carbon monoxide. 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.

Access holes are provided on the unit as shown in

Figure 11, p. 18 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. 37 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. 37) to handle the additional furnace capacity.

2. Take all branch 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 to use a pressure regulating device will result in incorrect gas pressures. This can cause erratic operation due to gas pressure fluctuations as well as damage to the gas valve.

• Oversizing the regulator 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 adequate 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 33, p. 37 for the Gas Train configuration.

1. Connect the supply gas piping using a “ground-joint” type union to the furnace gas train and check 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

36 RT-SVX34F-EN

Page 37

Table 18. Sizing natural gas pipe mains and branches

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. 36 Cu.Ft/Hour = 500 Tab l e 1 8 indicates that a 1-1/4” pipe is required. *Table is based on a specific gravity of 0.60. Use Table 17, p. 36 or the specific gravity of the local gas supply.

Installation Piping

Figure 33. Gas train configuration for low heat units

(high heat units utilize two gas trains.)

RT-SVX34F-EN 37

Page 38

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 - Economizer Actuator (Optional)

The ECA 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 to the closed position any time power is lost to the unit. It is capable of delivering up to 25 inch pounds of torque and is powered by 24 VAC. Refer to

“Mechanical Cooling with an Economizer,” p. 49 for the

proper Potentiometer settings for dry bulb/Enthalpy control.

PEA - Power Exhaust Actuator (Optional)

If the unit is ordered with tracking power exhaust, the PEA 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.

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

The RTAM 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, morning warm-up setpoint potentiometer, reset setpoint potentiometer, and 5 DIP switches. (See Figure 34, p. 38.)

Figure 34. RTAM module

Figure 35. RTOM module

J8 J4 J9

DA COOL/FAN SPD

-1

J1 J2

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.

R42 R40

R136

TP2

DA HEAT EXH

TP3

FAN

-1

SA REHEAT

J11

J10

J12

R41

R130

TP4

TP5

DEHUMID

TB1

TB2

R46

-1

J7J5

38 RT-SVX34F-EN

Page 39

Startup

DA COOL/FAN SPD

SA REHEAT

DEHUMID

SPC PRESS DB SPC PRESS

R136

J11

J12

TP2

TP3

R42

R40

1 1

TP4

TP5

R130

R41

TB2

TB1

R46

-1

1 = Space Pressure Deadband (iwc) 2 = Space Pressure Setpoint (iwc) 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 only required for Single Zone VAV units with Demand Controlled Ventilation installed.



RTDM

Figure 36. RTVM module

Figure 37. RTDM module

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.

The RTDM (Dehumidification Module) 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 low refrigerant pressure in the reheat circuit.

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.

The RTAM module provides a 0 to 10 Vdc output to control the Variable Frequency Drive. DIP switches 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 discharge 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 gas 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 35, p. 38 For VAV units with modulating gas heat,

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

RT-SVX34F-EN 39

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 21,

p. 31 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

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.

Page 40

Startup

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 Trane Tracer 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 installation 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 party BACnet system. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installations instructions that ship with each kit when field installation is necessary.

Manual Motor Protectors (380V Through 575V Only)

Manual motor protectors will be used as branch circuit protection for compressors and supply fan motors. These devices are capable of providing both overload and shortcircuit protection.

Before operating, the manual motor protector must be switched with the rotary on/off switch to the “ON” position and the overload setpoint dial must be set to the appropriate rating of the motor.

Important: In order to avoid nuisance trips, the

overload setpoint dial must be adjusted to the following calculated value: Overload Setting = (Motor FLA) x 1.12 Overload Setting = (Compressor RLA) x 1.12

Figure 38. Manual motor protectors



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 minimum “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 VAV units. When the fan mode switch on the Zone Sensor Module is set in the auto position, the RTRM provides individual supply fan timing

40 RT-SVX34F-EN

Page 41

Startup

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 shorting 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 short 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 Volume unit and a conventional thermostat is used, this input is ignored and the unit will respond to thermostat requests as during normal occupied mode.

VAV 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 programmable 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.

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 setpoint, 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%

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

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 disabled while 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 unsuitable conditions, the economizer is at the selected minimum position when the supply fan is “On”, and is closed when the supply fan 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.

RT-SVX34F-EN 41

Page 42

Startup

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 stepping sequence.

Table 21. Compressor staging with lead/lag disabled

“ON” “OFF”

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

CPR 1

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,

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 Switch is in the “AUTO” position and a call for cooling is initiated, the supply fan will 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 LED output will pulse. The system will remain locked 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 temperature 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 Tempering is active, heating will be turned OFF if the Supply Air Temperature rises to 10°F ABOVE the Active Occupied Zone Heating Setpoint, or the Zone Temperature 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.

42 RT-SVX34F-EN

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Startup

CV Units with Modulating Heat

On units with Modulating Gas Heat, Supply Air Tempering 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 Tempering 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 if 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 Temperature 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 “Tempering” the unit will transition to normal heating control and will control the supply air temperature 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 RTRM Supply Fan output energized and the RTOM Indoor Fan Speed output at 0Vdc the fan speed output is 58% (35Hz) from the VFD motor and at 10Vdc the fan speed output is 100% (60Hz). The control will scale the 0-10Vdc output from the RTOM linearly to control between the 58%-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 %.

Function

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%

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 off delays as implemented on constant volume units will be in effect. During the Supply Fan Off-Delay, the supply fan will remain energized for the

Minimum Fan

Output %

RT-SVX34F-EN 43

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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.

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 RTOM with ranges 50-150°F and 40-90°F respectively.

Tab le 2 2 and Table 23 below can be used as a reference

when setting the DA Heat (R42) and DA Cool - Fan SPD (R136) setpoints on the RTOM. Note that the recommended settings for these setpoints is 100°F for the DA Heat Setpoint and 50°F for the DA Cool - Fan SPD Setpoint:

Table 22. 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

age

Set-

point

(ºF)

Volt-

age

(Vdc)

Set-

point

(ºF)

Volt-

age

(Vdc)

Set-

point

(ºF)

Table 22. DA heat setpoint

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

2.40 150

Table 23. DA cool - fan SPD setpoint

Setpoint

(°F)

40 <0.1 55 1.65

41 0.2 56 1.7

42 0.3 57 1.75

43 0.45 58 1.83

44 0.55 59 1.9

45 0.7 60 1.95

46 0.8 61 2

47 0.95 62 2.05

48 1.05 63 2.1

49 1.15 64 2.13

50 1.25 65 2.17

51 1.3 66 2.21

52 1.35 67 2.27

53 1.45 68 2.3

54 1.55 69 2.35

Voltage

(Vdc)

Setpoint

(°F)

70 >2.4

Voltage

(Vdc)

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.

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 Ventilation (CO2 sensor value available) require a new control scheme comprised of 2 existing schemes that have been traditionally mutually exclusive; DCV and OA CFM Compensation.

Units configured with DCV will invoke the new Demand Controlled Ventilation scheme which allows variable Bldg. Design and DCV Minimum Positions and OA Damper

44 RT-SVX34F-EN

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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

Position Target setpoints based on the supply fan speed and space CO2 requirements.

This new scheme will require the setting of 5 OA Damper position setpoints; 3 more than on non-SZ VAV. 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 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

relative to the

active Design and DCV CO2 setpoints. Refer to Figure 40,

p. 45 for additional details on the design.

The Design Minimum and DCV Minimum OA Damper Position setpoints at Minimum Fan 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 100% 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 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 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 Test 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 Middle 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

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

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Maximum Fan Speed

Design @ Minimum Fan Speed

Design @ Maximum Fan Speed

OAD

Posion Setpoints

Fan Speed Algorithm Command

Design @ Maximum Fan

Speed

Exhaust Enable

Oﬀset

Exhaust Enable @

Maximum Fan Speed

Exhaust Enable Target

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 mak e the Design Minimum Position schedule linear.

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

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

2. To set the Design Minimum Position 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 41. SZVAV OA damper min position w/ OA CFM

compensation

OAD

Posion

Setpoints

Design @ Middle Fan Speed

The Exhaust Enable Target could be above or below the Active Bldg Design OA Min Position Target 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.

Figure 42. Space pressure control graph

Maximum Fan Speed Minimum Fan Speed Middle Fan Speed

Supply Air Temperature Control - Heating and Cooling

Minimum Fan Speed M iddle Fan Speed

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 scheme. 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 VAV the user will 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 Target to calculate the dynamic Exhaust Enable Target to be used throughout the Supply Fan Speed/OA Damper Position range

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 zone conditions in order to maintain the Zone Temperature 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 Setpoint 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 discharge 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

46 RT-SVX34F-EN

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Startup

compressor output control. Also, as on Traditional VAV units, mechanical cooling will be inhibited if economizing 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.

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 occurring 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 utilized 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 VAV boxes must be opened through 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 from 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 J6-11 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 will be held closed 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 deactivated through ICS or a night setback zone sensor. If ICS or a night setback 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 Warm-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 termination 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

RT-SVX34F-EN 47

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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

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

Figure 43. Output vs. input

Supply Air Temperature Reset

The supply air temperature can be reset by using one of four DIP switch configurations on the RTAM 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 RTAM potentiometer or ICS is permissible for each type of reset.

The amount of change applied to the supply air temperature setpoint depends on how far the return 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

48 RT-SVX34F-EN

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 RTAM 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 Switch #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 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 satisfying the Supply Air Tempering requirements, a 5 minute SA 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 Tempering Delay” timer

has timed-out and;

b. There is an active cooling request for VAV Occupied

Cooling.

Page 49

Startup

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

Off Mode

This mode is set at the zone sensor or by ICS. During this status, no heating, ventilation, or mechanical cooling is being performed. When switching the “System” selector to the “Off” mode from any other mode, any diagnostic data and diagnostic indication signal will be retained as long as the system remains in the “Off” status. Switching 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

Table 24. 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

Two 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 25 lists the selectable dry bulb values by

potentiometer setting.

2. Reference Enthalpy - controlling the economizer cycle by sensing the outdoor air humidity. Ta b le 25 lists the 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 25. Economizer configuration

Selection Dry Bulb Enthalpy Value

A 73°F 27 BTU/LB Air

B 70 25 BTU/LB Air

C 67 23 BTU/LB Air

D 63 22 BTU/LB Air

E 55 19 BTU/LB Air

OAT data is invalid or unavailable

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 deadband. For traditional VAV systems, the VFD will operate at 100% 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 descending order of complexity. The most sophisticated method available is always used.

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 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 only 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 capabilities 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 switch is in the “AUTO” mode and the unit is configured as a Constant Volume with staged or modulating gas heat, or SZ VAV 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

RT-SVX34F-EN 49

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Startup

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 outputs 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.

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 Ventilation 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 Override 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 Ventilation Override 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 26 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 26. 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 Fanononoff

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 approximately 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 VAC, and LED indicators for ON and FAULT. There are no field adjustments and the module will automatically reset from a fault condition.

50 RT-SVX34F-EN

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Startup

Exhaust Enable

Oﬀset

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 minutes.

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, the compressor(s) in that circuit will be locked out.

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 Minimum Position Target to calculate the dynamic Exhaust Enable Target 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 Fan Speed Command)

Figure 44. SZ VAV exhaust

OAD

Posion Setpoints

Exhaust Enable Target

High Pressure Cutout and Temperature Discharge Limit

Exhaust Enable @ Fan Speed

Design @ Full Fan

Full

Speed

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 lack of current while calling for cooling and locks both

Maximum Fan Speed Minimum Fan Speed Middle Fan Speed

compressors out with an auto reset. On 40 and 50 Ton units, if the high pressure safety or temperature discharge 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.

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

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.

RT-SVX34F-EN 51

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.

Page 52

Startup

-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

Figure 45. Transducer voltage output vs. pressure input for

building pressure

Power Exhaust Control (Tracking)

The power exhaust dampers proportionally track 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 51, p. 73. Refer to Power Exhaust Fan Performance” tables beginning with Table 49, p. 73.

Lead/Lag Control

Lead/Lag is a selectable input located on the RTRM. 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 activated, each time the designated lead compressor(s) is shut off due to the load being satisfied, the lead compressor or refrigeration circuit switches. When the RTRM is powered up, i.e. after a power failure, the control will default to the number one compressor.

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 occurred for 5 seconds minimum, the RTRM turns off 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.

Dehumidification Frost Protection

Two 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 10 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. For single circuit units one compressor 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. When the unit is operating in dehumidification mode, only the reheat circuit will be re-enabled if the EET rises above 45ºF. The cooling circuit will not 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 Cooling, 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 after the EET rises above 45ºF or if a purge cycle is initiated.

Table 27. Capacity steps with lead/lag enabled

Unit Size Step 1 Step 2 Step 3

TC*330

TC*360

TC*420

TC*480

TC*600

52 RT-SVX34F-EN

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%

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 28 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 46, p. 53 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 Outputs A and B and the compressor steps are deenergized for approximately seven seconds to prevent problems with fan windmill.

Page 53

Startup

Table 28. Condenser fan/compressor sequence

Compressor Staging

Unit Size

(Ton)

27.5 30

CPR 1 **

Notes:

1. The Compressor(s) listed under each step are the operating 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 compressor(s) in step 2 & 3 will alternate and the fan sequence listed for that step will be in operation.

2. Conventional thermostat sequence: Y1=CPR1, Y2=CPR2 (40 CPR 2 & 50 CPR 2,3), Y1 + Y2 = CPR1,2 (40 CPR 1,2 & 50 CPR 1,2,3)

3. 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 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 when the O/A falls below 80°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

* Single circuit, manifolded compressors pair. ** First Stage, Number one refrigeration circuit, Standalone compressor is

“On”.

*** First Stage is “Off”, Number two refrigeration circuit, standalone compres-

sor is “On”

****First stage is “Off”, Number two refrigeration circuit, manifolded com-

pressor pair is “On” operating simultaneously

Sequence

Step 1 Step2 Step 3

CPR 1*

N/A

CPR 1, 2

CPR 1*

CPR 1, 2 N/A

CPR 2***

CPR 1, 2

CPR 2, 3****

CPR 1, 2, 3

Condenser Fan

Output

Output AOutput BFans

Fan #2 70

Fan #3 9 0

Fan #2 -10

Fan #3 6 0

Fan #2 65

Fan #3 8 5

Fan #2 -20

Fan #3 5 5

Fan #2 50

Fan #3, 4 70

Fan #2 2 0

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)

“Off”

Figure 46. Condenser fan location

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.

WARNI NG

Hazardous Voltage!

• Check all electrical connections for tightness and “point of termination” accuracy.

• Verify 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.

• 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 lubricating, 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.

RT-SVX34F-EN 53

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Startup

Volt1 Volt2 Volt3++

---------------------------------------------------------------

221 230 227++

-----------------------------------------------

226Avg=

226 221–

226

----------------------------

100 2.2percent=

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:

WARNING

Hazardous Voltage!

• 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 compressor leads, connect the phase sequence indicator leads to the terminal block or unit mounted disconnect switch as follows;

Table 29. 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 switch (if Applicable) to the “Auto” position.

• Close the disconnect switch or circuit protector switch 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. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

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 switch or circuit protection switch and reverse any two power wires.

• Restore main electrical power and recheck 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

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 Voltage) =

Volt 1, Volt 2, Volt 3 = Line Voltage Readings

VD = Line Voltage reading that deviates the farthest from the average voltage.

Example:

If the voltage readings of 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 imbalance 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.

54 RT-SVX34F-EN

Page 55

Startup

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 switch for Constant Volume or SZ VAV units is in the “Auto” position.

Close the main power disconnect switch and the unit mounted disconnect switch, if applicable.

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 configuration 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 “Test” 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 switch. 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 units or discharge air temperature for variable air volume units.

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 one hour to complete the check.

2. Resistance Test Mode - This method can be used for startup providing a decade box for variable resistance 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 Volume or Variable Air Volume test steps, test modes, and step resistance values to cycle the various components, refer to Table 31, p. 56 - Table 36, p. 58.

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 under the control panel behind the front cover.

Table 30. Service test switch

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

RT-SVX34F-EN 55

Page 56

Startup

Table 31. Test mode states for traditional VAV units with modulating dehumidification and staged 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

6 COOL 2

7 COOL 3 ON IN-CONTROL MIN ON ON OFF OFF IN-CONTROL 100% 0% ON

8 REHEAT ON IN-CONTROL MIN ON ON OFF OFF IN-CONTROL 50% 50% ON

9 HEAT 1 ON IN-CONTROL MIN OFF OFF ON OFF OFF 100% 0% ON

10 HEAT 2 ON IN-CONTROL MIN OFF OFF ON ON OFF 100% 0% ON

11 RESET

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.

ON IN-CONTROL MIN ON2ON2OFF OFF IN-CONTROL 100% 0% ON

COMP 1COMP 2HEAT 1HEAT

2PUMPOUT

COOL

VALVE

REHEAT

VALVE

VAV

BOX

Table 32. Test mode states for CV units with modulating dehumidification and staged heat

TEST

STEP MODE FAN ECON3COMP 1 COMP 2 HEAT 1 HEAT 2 PUMPOUT

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

4 COOL 2

5 COOL 3 ON MIN ON ON OFF OFF IN-CONTROL 100% 0% ON

6 REHEAT ON MIN ON ON OFF OFF IN-CONTROL 50% 50% ON

7 HEAT 1 ON MIN OFF OFF ON OFF OFF 100% 0% ON

8 HEAT 2 ON MIN OFF OFF ON ON OFF 100% 0% ON

9 RESET

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 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 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.

ON MIN ON

OFF OFF IN-CONTROL 100% 0% ON

COOL

VALVE

REHEAT

VALVE VAV BOX

56 RT-SVX34F-EN

Page 57

Table 33. Test mode states for SZ VAV units with modulating dehumidification and staged heat

Startup

TEST STEP MODE FAN VFD COMMAND

1 FAN ON ON 58% (0 VDC) MIN OFF OFF OFF OFF OFF 100% 0%

2 ECONOMIZER ON 58% (0 VDC) OPEN OFF OFF OFF OFF OFF 100% 0%

3 COOL 1 ON 86% (6.67 VDC) MIN ON OFF OFF OFF IN-CONTROL 100% 0%

4 COOL 2

5 COOL 3 ON 100% (10 VDC) MIN ON ON OFF OFF IN-CONTROL 100% 0%

6 REHEAT ON 80% (5.24 VDC) MIN ON ON OFF OFF IN-CONTROL 50% 50%

7 HEAT 1 ON 100% (10 VDC) MIN OFF OFF ON OFF OFF 100% 0%

8 HEAT 2 ON 100% (10 VDC) MIN OFF OFF ON ON OFF 100% 0%

9 RESET

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.

ON 100% (10 VDC) MIN ON2ON2OFF OFF IN-CONTROL 100% 0%

ECON

COMP 1COMP 2HEAT 1HEAT

2PUMPOUT

COOL

VALVE

REHEAT

VALVE

Table 34. Test mode states for traditional VAV units with modulating dehumidification and modulating heat

TEST STEP MODE FAN VFD COMMAND1ECON4COMP 1 COMP 2

1 VFD SIGNAL 100% OFF 100% (10VDC) CLOSED OFF OFF OFF OFF 100% 0% ON

2 VFD SIGNAL 0% OFF 0% (0 VDC) CLOSED OFF OFF OFF OFF 100% 0% ON

3 MIN VENT ON IN-CONTROL MIN OFF OFF OFF OFF 100% 0% ON

4 ECON TEST OPEN ON IN-CONTROL OPEN OFF OFF OFF OFF 100% 0% ON

5 COOL 1 ON IN-CONTROL MIN ON OFF OFF IN-CONTROL 100% 0% ON

6 COOL 2

7 COOL 3 ON IN-CONTROL MIN ON ON OFF IN-CONTROL 100% 0% ON

8 REHEAT ON IN-CONTROL MIN ON ON OFF IN-CONTROL 50% 50% ON

9 HEAT 1 ON IN-CONTROL MIN OFF OFF 50% OFF 100% 0% ON

10 HEAT 2 ON IN-CONTROL MIN OFF OFF 100% OFF 100% 0% ON

11 RESET

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.

ON IN-CONTROL MIN ON

HEAT

OUTPUT PUMPOUT

OFF IN-CONTROL 100% 0% ON

COOL

VALVE

REHEAT

VALVE

VAV

BOX

RT-SVX34F-EN 57

Page 58

Startup

Table 35. Test mode states for CV units with modulating dehumidification and modulating heat

TEST

STEP MODE FAN ECON

1 FAN ON ON MIN OFF OFF OFF OFF 100% 0% ON

2 ECONOMIZER ON OPEN OFF OFF OFF OFF 100% 0% ON

3 COOL 1 ON MIN ON OFF OFF IN-CONTROL 100% 0% ON

4COOL 2

5 COOL 3 ON MIN ON ON OFF IN-CONTROL 100% 0% ON

6 REHEAT ON MIN ON ON OFF IN-CONTROL 50% 50% ON

7 HEAT 1 ON MIN OFF OFF 50% OFF 100% 0% ON

8 HEAT 2 ON MIN OFF OFF 100% OFF 100% 0% ON

9RESET

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 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 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.

ON MIN ON

COMP 1 COMP 2

HEAT

OUTPUT PUMPOUT

OFF IN-CONTROL 100% 0% ON

COOL

VALVE

REHEAT

VALVE VAV BOX

Table 36. Test mode states for SZ VAV units with modulating dehumidification and modulating heat

TEST STEP MODE FAN VFD COMMAND1ECON4COMP 1 COMP 2

1 FAN ON ON 58% (0 VDC) MIN OFF OFF 0% OFF 100% 0%

2 ECONOMIZER ON 58% (0 VDC) OPEN OFF OFF 0% OFF 100% 0%

3 COOL 1 ON 86% (6.67 VDC) MIN ON OFF 0% IN-CONTROL 100% 0%

4COOL 2

5 COOL 3 ON 100% (10 VDC) MIN ON ON 0% IN-CONTROL 100% 0%

6 REHEAT ON 80% (5.24 VDC) MIN ON ON 0% IN-CONTROL 50% 50%

7 HEAT 1 ON 100% (10 VDC) MIN OFF OFF 50% OFF 100% 0%

8 HEAT 2 ON 100% (10 VDC) MIN OFF OFF 100% OFF 100% 0%

9RESET

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.

ON 100% (10 VDC) MIN ON

HEAT

OUTPUT PUMPOUT

0% IN-CONTROL 100% 0%

COOL

VALVE

REHEAT

VALVE

58 RT-SVX34F-EN

Page 59

Startup

Actual Motor Amps

Motor Nameplate Amps

----------------------------- -------------------------------------------

Motor HP Theoretical BHP =r

Verifying Proper Fan Rotation

WARNI NG

Rotating Components!

The following procedure 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.

Using Table 31, p. 56 to Table 36, p. 58 as a reference, momentarily jump across the test terminals to start the Minimum Ventilation Test.

The Exhaust Fan will start anytime the economizer 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, check 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.

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 VAV applications, the VFD will be under control

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 Figure 47, p. 62 and Figure 48, p. 62.

Theoretical BHP Formula:

Where the two points intersect, read straight down to the CFM line. Use Table 45, p. 69 to select a new fan drive if the CFM is not within specifications.

WARN ING

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 block or the unit mounted disconnect switch is ABC as outlined in “Electrical

Phasing,” p. 54.

Verifying Proper Air Flow (CFM) -  CV or VFD's

1. All systems - Set the minimum position setting 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:

RT-SVX34F-EN 59

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Table 37. Supply fan performance—27½-35 Ton—60 Hz

Total Static Pressure (in. wg)

CFM Std.

Air

8000 308 1.17 372 1.62 427 2.09 475 2.55 525 3.11 574 3.75 620 4.42 661 5.09 701 5.77

8500 317 1.33 381 1.82 436 2.33 480 2.77 528 3.34 574 3.97 620 4.66 662 5.36 702 6.08

9000 326 1.51 391 2.04 443 2.55 489 3.08 532 3.58 577 4.22 620 4.91 663 5.64 703 6.40

9500 337 1.72 401 2.28 451 2.80 498 3.39 537 3.87 580 4.50 621 5.18 663 5.93 703 6.70

10000 349 1.96 411 2.54 459 3.09 506 3.69 545 4.25 584 4.81 624 5.48 664 6.23 703 7.02

10500 363 2.22 421 2.82 468 3.40 513 3.98 555 4.65 589 5.17 628 5.84 666 6.56 703 7.34

11000 376 2.52 430 3.11 479 3.74 521 4.33 563 5.03 598 5.63 633 6.22 670 6.95 706 7.73

11500 390 2.83 438 3.41 489 4.10 530 4.72 570 5.38 607 6.11 639 6.68 674 7.37 709 8.14

12000 404 3.18 447 3.74 499 4.48 538 5.13 578 5.79 615 6.56 648 7.22 679 7.83 713 8.59

12500 417 3.55 457 4.10 509 4.88 549 5.58 586 6.24 623 7.00 657 7.78 687 8.42 718 9.10

13000 431 3.95 468 4.50 518 5.30 559 6.04 594 6.73 630 7.45 665 8.30 696 9.04 724 9.69

13500 445 4.39 479 4.92 526 5.73 569 6.53 604 7.26 638 7.98 673 8.82 705 9.68 733 10.38

14000 459 4.85 490 5.39 535 6.19 579 7.04 614 7.81 647 8.56 680 9.35 713 10.26 742 11.09

14500 473 5.35 503 5.90 544 6.68 588 7.59 624 8.40 656 9.18 688 9.96 720 10.86 751 11.78

CFM Std.

Air

8000 738 6.48 773 7.18 805 7.88

8500 739 6.82 774 7.54 807 8.28

9000 740 7.16 775 7.92 809 8.70

9500 740 7.48 776 8.30 810 9.12

10000 742 7.86 777 8.68 812 9.54

10500 742 8.20 777 9.05 812 9.94

11000 741 8.56 777 9.43 812 10.35

11500 743 8.95 777 9.83 812 10.78

12000 747 9.43 780 10.30 812 11.21

12500 750 9.90 783 10.79 814 11.70

13000 755 10.45 786 11.30 817 12.22

13500 760 11.04 790 11.88 821 12.81

14000 768 11.79 795 12.52 824 13.39

14500 778 12.59 803 13.30 829 14.10

Notes:

1. Supply fan performance table includes internal resistance of rooftop. For total static pressure determination, system external static must be added to appropriate component static pressure drops, (evaporator coil, filters, optional economizer, optional heating system, optional roof curb).

2. The pressure drop from the supply fan to the space cannot exceed 2.25”.

3. Maximum air flow for 27½ ton — 12,100 cfm, 30 ton — 13,200 cfm, 35 ton — 14,400 cfm.

4. Maximum motor horsepower for 27½ ton — 10 hp, 30 ton — 10 hp, 35 ton — 15 hp.

0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

RPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPM BHP RPM BHP

Total Static Pressure (in. wg)

2.50 2.75 3.00

RPMBHPRPMBHPRPMBHP

60 RT-SVX34F-EN

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Startup

Table 38. Supply fan performance—40 and 50 Ton—60 Hz

Total Static Pressure (in. wg)

CFM Std.

Air

12000 307 2.29 353 2.86 394 3.45 436 4.11 471 4.75 509 5.43 543 6.14 575 6.89 606 7.63

13000 324 2.79 368 3.40 407 4.06 446 4.73 482 5.43 515 6.13 550 6.87 582 7.65 612 8.44

14000 341 3.35 384 4.03 422 4.74 457 5.42 494 6.19 525 6.93 556 7.69 589 8.49 619 9.32

15000 359 3.99 401 4.77 437 5.48 471 6.24 504 6.99 537 7.82 566 8.62 595 9.42 625 10.27

16000 376 4.72 418 5.60 452 6.32 485 7.14 515 7.92 548 8.77 578 9.65 604 10.49 632 11.36

17000 394 5.53 434 6.50 468 7.26 500 8.12 529 8.97 558 9.79 589 10.73 616 11.65 641 12.54

18000 413 6.42 451 7.48 485 8.34 515 9.18 544 10.11 571 10.99 598 11.89 628 12.88 654 13.87

19000 431 7.42 469 8.55 501 9.53 530 10.37 559 11.34 585 12.29 611 13.22 637 14.17 665 15.24

20000 449 8.52 486 9.72 518 10.83 547 11.69 573 12.66 600 13.69 625 14.70 648 15.64 675 16.71

CFM Std.

Air

12000 640 8.45 670 9.25 700 10.03 727 10.81 755 11.61

13000 640 9.23 671 10.12 701 10.98 729 11.85 756 12.69

14000 647 10.16 674 11.04 700 11.89 729 12.85 757 13.79

15000 653 11.14 680 12.05 706 12.97 731 13.89 757 14.86

16000 659 12.23 687 13.16 713 14.14 738 15.10 762 16.10

17000 666 13.45 694 14.42 719 15.37 744 16.39 768 17.39

18000 677 14.81 700 15.76 726 16.78 751 17.77 774 18.81

19000 690 16.29 711 17.27 734 18.29 758 19.34 782 20.41

20000 701 17.83 724 18.91 745 19.94 765 20.99 788 22.12

Notes:

2. The pressure drop from the supply fan to the space cannot exceed 2.50".

3. Maximum air flow for 40 ton — 17,600 cfm, 50 ton — 20,000 cfm.

4. Maximum motor horsepower for 40 ton — 15 hp, 50 ton — 20 hp.

0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

RPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPM BHP RPM BHP

Total Static Pressure (in. wg)

2.50 2.75 3.00 3.25 3.50

RPMBHPRPMBHPRPMBHPRPMBHPRPMBHP

RT-SVX34F-EN 61

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Startup

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)

Figure 47. Supply fan performance curves 27.5 - 35 ton — 60Hz

Figure 48. Supply fan performance curves 40 and 50 ton — 60Hz

62 RT-SVX34F-EN

Page 63

Table 39. Supply fan performance—22.9-29.1 ton (I-P) — 50 Hz

Static Pressure (in. wg)

SCF

6670 283 0.80 351 1.18 410 1.58 469 2.08 524 2.63 573 3.20 617 3.78 659 4.37 696 4.96

7085 291 0.90 358 1.31 413 1.70 469 2.21 524 2.78 574 3.37 619 3.98 660 4.59 698 5.22

7500 299 1.02 364 1.43 418 1.86 472 2.35 524 2.92 574 3.55 619 4.18 661 4.82 699 5.46

7915 306 1.14 371 1.58 425 2.05 475 2.51 524 3.08 574 3.72 620 4.38 661 5.04 701 5.73

8330 313 1.27 378 1.75 433 2.25 478 2.69 527 3.26 574 3.89 620 4.58 662 5.27 702 5.99

8745 321 1.42 386 1.93 439 2.43 484 2.92 530 3.45 574 4.08 620 4.79 663 5.51 702 6.24

9160 330 1.58 394 2.12 445 2.62 492 3.18 533 3.67 577 4.30 620 4.99 664 5.74 703 6.50

9575 339 1.76 403 2.32 452 2.84 499 3.44 538 3.93 580 4.53 622 5.22 663 5.96 703 6.76

9990 349 1.95 411 2.54 459 3.08 505 3.68 545 4.24 583 4.80 624 5.49 663 6.21 703 7.02

10405 360 2.17 419 2.77 467 3.34 511 3.92 552 4.57 588 5.09 628 5.77 665 6.49 703 7.28

10820 371 2.41 426 3.00 475 3.62 518 4.20 560 4.90 595 5.46 631 6.07 668 6.80 705 7.59

11235 383 2.66 434 3.25 483 3.90 525 4.50 566 5.19 603 5.85 634 6.41 671 7.13 707 7.90

11650 394 2.93 441 3.51 492 4.21 532 4.83 572 5.51 610 6.25 642 6.84 675 7.50 710 8.26

12065 405 3.23 449 3.79 500 4.53 540 5.18 578 5.83 616 6.61 649 7.30 680 7.90 714 8.67

SCF

6670 733 5.60 767 6.23 800 6.88

7085 735 5.86 769 6.52 802 7.18

7500 736 6.13 771 6.82 803 7.49

7915 737 6.40 772 7.10 806 7.83

8330 739 6.70 773 7.41 807 8.16

8745 740 6.99 775 7.73 808 8.49

9160 740 7.25 776 8.06 809 8.83

9575 740 7.54 777 8.38 810 9.17

9990 741 7.83 776 8.65 811 9.51

10405 742 8.14 777 8.99 812 9.86

10820 741 8.41 777 9.31 812 10.21

11235 742 8.74 778 9.63 812 10.55

11650 745 9.11 778 9.96 812 10.89

12065 747 9.47 779 10.34 811 11.24

Notes:

1. Supply fan performance table includes internal resistance of rooftop. For total static pressure determination, system

2. The pressure drops from the supply fan to the space should not exceed 2.25” (558.8 Pa) positive.

3. Maximum air flow 23 ton (80 kW) is 4756 L/s, 25 ton is 5190 L/s, 29 ton is 5663 L/s

4. Maximum motor kW for 23 ton unit is 7.5 (10 hp), 25 ton is 7.5 kW (10 hp), 29 ton is 11.2 kW (15 hp).

0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

RPMBHPRPM BHP RPM BHP RPMBHPRPMBHPRPMBHPRPMBHPRPMBHPRPMBHP

Static Pressure (in. wg)

2.50 2.75 3.00

RPM BHP RPM BHP RPM BHP

external static must be added to appropriate component static pressure drops, (evaporator coil, filters, optional economizer, optional heating system, optional roof curb).

Startup

RT-SVX34F-EN 63

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Startup

Table 40. Supply fan performance — 82-105 kW (SI) — 50 Hz

Static Pressure (Pascals)

62.9 124.1 186.2 248.3 310.4 372.5 434.6 496.7 558.8

(L/s)

RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW)

3148 283 0.59 351 0.88 410 1.17 469 1.55 524 1.96 573 2.39 617 2.82 659 3.26 696 3.70

3344 291 0.67 358 0.98 413 1.27 469 1.65 524 2.07 574 2.52 619 2.97 660 3.42 698 3.89

3539 299 0.76 364 1.07 418 1.39 472 1.75 524 2.18 574 2.64 619 3.12 661 3.59 699 4.07

3735 306 0.85 371 1.18 425 1.53 475 1.87 524 2.29 574 2.77 620 3.26 661 3.76 701 4.27

3931 313 0.95 378 1.30 433 1.68 478 2.01 527 2.43 574 2.90 620 3.41 662 3.93 702 4.46

4127 321 1.06 386 1.44 439 1.81 484 2.18 530 2.58 574 3.04 620 3.57 663 4.11 702 4.65

4323 330 1.18 394 1.58 445 1.95 492 2.37 533 2.74 577 3.21 620 3.72 664 4.28 703 4.84

4519 339 1.31 403 1.73 452 2.12 499 2.56 538 2.93 580 3.38 622 3.89 663 4.45 703 5.04

4715 349 1.45 411 1.89 459 2.30 505 2.74 545 3.17 583 3.58 624 4.09 663 4.63 703 5.23

4910 360 1.62 419 2.06 467 2.49 511 2.93 552 3.40 588 3.79 628 4.31 665 4.84 703 5.43

5106 371 1.80 426 2.24 475 2.70 518 3.13 560 3.65 595 4.07 631 4.53 668 5.07 705 5.66

5302 383 1.98 434 2.42 483 2.91 525 3.36 566 3.87 603 4.37 634 4.78 671 5.32 707 5.89

5498 394 2.19 441 2.62 492 3.14 532 3.60 572 4.11 610 4.66 642 5.10 675 5.59 710 6.16

5694 405 2.41 449 2.83 500 3.38 540 3.87 578 4.35 616 4.93 649 5.44 680 5.89 714 6.46

Static Pressure (Pascals)

620.9 683.0 745.1

(L/s)

RPM (kW) RPM (kW) RPM (kW)

3148 733 4.18 767 4.65 800 5.13

3344 735 4.37 769 4.86 802 5.36

3539 736 4.57 771 5.08 803 5.58

3735 737 4.77 772 5.29 806 5.84

3931 739 5.00 773 5.53 807 6.08

4127 740 5.21 775 5.76 808 6.33

4323 740 5.41 776 6.01 809 6.58

4519 740 5.62 777 6.25 810 6.84

4715 741 5.84 776 6.45 811 7.09

4910 742 6.07 777 6.70 812 7.35

5106 741 6.27 777 6.94 812 7.62

5302 742 6.52 778 7.18 812 7.87

5498 745 6.79 778 7.43 812 8.12

5694 747 7.06 779 7.71 811 8.38

Notes:

2. The pressure drops from the supply fan to the space should not exceed 2.25” (558.8 Pa) positive.

3. Maximum air flow 23 ton (80 kW) is 4756 L/s, 25 ton is 5190 L/s, 29 ton is 5663 L/s

4. Maximum motor kW for 23 ton unit is 7.5 (10 hp), 25 ton is 7.5 kW (10 hp), 29 ton is 11.2 kW (15 hp).

64 RT-SVX34F-EN

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Startup

Table 41. Supply fan performance — 33.3 and 41.7 Tons (I-P) — 50 Hz

Static Pressure (in. wg)

0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

CFM

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

9996 273 1.46 324 1.95 372 2.49 417 3.04 458 3.64 495 4.25 535 4.92 572 5.59 605 6.23

10829 287 1.78 336 2.30 383 2.87 422 3.44 464 4.06 501 4.71 535 5.38 572 6.11 606 6.81

11662 301 2.14 348 2.69 390 3.27 432 3.91 469 4.53 506 5.21 541 5.91 573 6.64 607 7.41

12495 315 2.53 360 3.12 401 3.74 442 4.41 476 5.07 512 5.76 546 6.49 578 7.24 609 8.03

13328 329 2.96 373 3.60 412 4.27 450 4.94 486 5.67 518 6.38 551 7.12 584 7.91 614 8.71

14161 344 3.45 387 4.14 424 4.85 459 5.55 495 6.31 527 7.08 557 7.83 589 8.62 619 9.45

14994 358 3.99 401 4.77 437 5.48 470 6.23 503 6.98 538 7.83 565 8.61 594 9.41 625 10.27

15827 373 4.58 415 5.45 449 6.17 482 6.98 513 7.75 546 8.61 576 9.46 602 10.30 630 11.14

16660 388 5.24 429 6.19 463 6.93 495 7.78 525 8.61 554 9.43 586 10.36 613 11.26 637 12.13

Static Pressure (in. wg)

2.50 2.75 3.00 3.25 3.50

CFM

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

9996 636 6.90 665 7.63 691 8.35 717 9.10 743 9.87

10829 638 7.53 669 8.24 697 8.99 722 9.77 748 10.57

11662 639 8.17 671 8.97 699 9.73 727 10.47 751 11.26

12495 639 8.82 670 9.66 700 10.49 728 11.33 755 12.13

13328 642 9.52 671 10.38 700 11.27 729 12.17 756 13.04

14161 648 10.31 674 11.16 702 12.08 730 13.01 757 13.96

14994 653 11.13 680 12.03 706 12.96 731 13.87 757 14.88

15827 659 12.04 686 12.99 711 13.92 737 14.90 761 15.87

16660 664 13.04 691 13.97 717 14.94 742 15.96 765 16.94

Notes:

1. Supply fan performance table includes internal resistance of rooftop. For total static pressure determination, system external static must be added to

appropriate component static pressure drops, (evaporator coil, filters, optional economizer, optional heating system, optional roof curb).

2. The pressure drops from the supply fan to the space should not exceed 2.5” wg (620.9 Pa) positive.

3. Max cfm for 33 ton unit 6825 L/s, 42 ton -7860 L/s

4. Max motor hp for 33 ton unit-11.2 kW (15 hp), 42 ton 14.9 kW (20 hp)

RT-SVX34F-EN 65

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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

0 HP

7.5 HP

5 HP

800 RPM

700 RPM

600 RPM

500 RPM

400

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(InWC)

Figure 49. Supply fan performance — 22.9-29.2 Tons — 50Hz

Figure 50. Supply fan performance — 33.3 and 41.7 Ton (IP) — 50Hz

66 RT-SVX34F-EN

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Table 42. Supply fan performance — 105-148 kW (SI) — 50 Hz

Static Pressure (Pascals)

62.1 124.2 186.3 248.1 310.4 372.5 434.6 496.7 558.8

(L/s)

Notes:

1. Supply fan performance table includes internal resistance of rooftop. For total static pressure determination, system external static must be added to

2. The pressure drops from the supply fan to the space should not exceed 2.5” wg (620.9 Pa) positive.

3. Max cfm for 33 ton unit 6825 L/s, 42 ton -7860 L/s

4. Max motor hp for 33 ton unit-11.2 kW (15 hp), 42 ton 14.9 kW (20 hp)

RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW)

4717 273 1.09 324 1.46 372 1.86 417 2.27 458 2.72 495 3.17 535 3.67 572 4.17 605 4.64

5111 287 1.33 336 1.72 383 2.14 422 2.57 464 3.03 501 3.51 535 4.01 572 4.55 606 5.08

5504 301 1.59 348 2.00 390 2.44 432 2.91 469 3.38 506 3.88 541 4.41 573 4.95 607 5.52

5897 315 1.88 360 2.33 401 2.79 442 3.29 476 3.78 512 4.30 546 4.84 578 5.40 609 5.99

6290 329 2.21 373 2.68 412 3.19 450 3.69 486 4.23 518 4.76 551 5.31 584 5.90 614 6.49

6683 344 2.57 387 3.09 424 3.62 459 4.14 495 4.70 527 5.28 557 5.84 589 6.43 619 7.05

7076 358 2.97 401 3.56 437 4.09 470 4.65 503 5.21 538 5.84 565 6.42 594 7.02 625 7.66

7469 373 3.42 415 4.07 449 4.60 482 5.20 513 5.78 546 6.42 576 7.06 602 7.68 630 8.31

7862 388 3.91 429 4.61 463 5.17 495 5.80 525 6.42 554 7.03 586 7.73 613 8.40 637 9.05

Static Pressure (Pascals)

620.9 683.0 745.1 807.2 869.3

RPM (kW) RPM (kW) RPM (kW) RPM (kW) RPM (kW)

4717 636 5.14 665 5.69 691 6.22 717 6.78 743 7.36

5111 638 5.62 669 6.14 697 6.70 722 7.28 748 7.88

5504 639 6.09 671 6.69 699 7.25 727 7.81 751 8.40

5897 639 6.57 670 7.20 700 7.83 728 8.45 755 9.05

6290 642 7.10 671 7.74 700 8.41 729 9.07 756 9.72

6683 648 7.69 674 8.32 702 9.01 730 9.71 757 10.41

7076 653 8.30 680 8.97 706 9.66 731 10.35 757 11.10

7469 659 8.98 686 9.69 711 10.38 737 11.11 761 11.84

7862 664 9.72 691 10.42 717 11.14 742 11.90 765 12.63

appropriate component static pressure drops, (evaporator coil, filters, optional economizer, optional heating system, optional roof curb).

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Table 43. TC*/YC* 300 - 600 MBH economizer (R/A) damper pressure drop

Unit

Capacity

27.5

(a) Static Pressure Drops for the return air damper must be added to the system external static pressure as an

(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

accessory when using the fan performance tables and the fan curves to determine actual fan performance.

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

68 RT-SVX34F-EN

Page 69

Table 44. Component static pressure drops (in. W.G.)1 — 60 Hz

Heating System

Gas Heat Electric Heat

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.

CFM

Std Air

10000 0.13 0.1 0.08 0.09 0.17 0.26 0.1 0.16 0.15 0.27 0.07

11000 0.15 0.12 0.1 0.11 0.20 0.30 0.12 0.2 0.17 0.31 0.09

12000 0.18 0.14 0.12 0.13 0.23 0.34 0.13 0.21 0.2 0.35 0.10

10000 0.13 0.1 0.08 0.09 0.17 0.26 0.1 0.16 0.15 0.27 0.07

11000 0.15 0.12 0.1 0.11 0.20 0.30 0.12 0.2 0.17 0.31 0.09

12000 0.18 0.14 0.12 0.13 0.23 0.34 0.14 0.23 0.21 0.36 0.10

13000 0.21 0.16 0.14 0.15 0.27 0.38 0.15 0.26 0.23 0.39 0.11

10500 0.14 0.11 0.09 0.1 0.25 0.37 0.11 0.18 0.16 0.29 0.07

11500 0.17 0.13 0.11 0.12 0.29 0.42 0.13 0.21 0.19 0.33 0.09

12500 0.2 0.15 0.13 0.14 0.33 0.48 0.14 0.24 0.21 0.37 0.10

13500 0.23 0.18 0.15 0.16 0.38 0.53 0.15 0.26 0.23 0.4 0.11

14500 0.26 0.2 0.18 0.19 0.42 0.59 0.17 0.3 0.27 0.43 0.12

12000 0.01 0.03 0.08 0.13 0.24 0.36 0.1 0.19 0.17 0.34 0.09

13000 0.01 0.04 0.1 0.15 0.28 0.41 0.12 0.23 0.2 0.36 0.11

14000 0.02 0.05 0.11 0.18 0.31 0.46 0.13 0.25 0.22 0.39 0.12

15000 0.02 0.05 0.13 0.2 0.35 0.50 0.14 0.28 0.24 0.44 0.10

16000 0.02 0.06 0.15 0.23 0.39 0.55 0.15 0.31 0.27 0.48 0.14

17000 0.02 0.07 0.17 0.26 0.43 0.60 0.17 0.35 0.3 0.54 0.15

15000 0.02 0.05 0.13 0.2 0.44 0.63 0.14 0.28 0.24 0.44 0.13

16000 0.02 0.06 0.15 0.23 0.49 0.69 0.15 0.31 0.27 0.48 0.14

17000 0.02 0.07 0.17 0.26 0.54 0.75 0.17 0.35 0.3 0.54 0.16

18000 0.03 0.08 0.19 0.29 0.59 0.82 0.18 0.38 0.33 0.58 0.18

19000 0.03 0.08 0.21 0.32 0.65 0.89 0.19 0.42 0.35 0.64 0.21

20000 0.03 0.09 0.23 0.36 0.71 0.96 0.2 0.45 0.38 0.67 0.23

Low High1 Element2 Element Dry Wet 2" 2" 4" 4"

8000 0.08 0.06 0.05 0.06 0.12 0.19 0.08 0.12 0.11 0.19 0.05

9000 0.1 0.08 0.07 0.07 0.14 0.22 0.09 0.14 0.13 0.23 0.06

ID Coil

Throw-away MERV 8 High Eff. MERV14 High Eff

Filters

Startup

Economizer

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-SVX34F-EN 69

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.

Page 70

Startup

Table 46. Component static pressure drops in. wg (I-P) — 50 Hz

Heating System Filters

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 0.05 0.08 0.07 0.16 0.03

7500 0.08 0.07 0.06 0.06 0.11 0.17 0.07 0.11 0.1 0.19 0.04

8330 0.1 0.08 0.07 0.08 0.13 0.20 0.08 0.13 0.12 0.21 0.05

9170 0.13 0.1 0.08 0.09 0.15 0.23 0.09 0.15 0.14 0.24 0.06

10000 0.15 0.12 0.1 0.11 0.17 0.26 0.11 0.18 0.16 0.27 0.07

7500 0.08 0.07 0.06 0.06 0.11 0.17 0.07 0.11 0.1 0.19 0.04

8330 0.1 0.08 0.07 0.08 0.13 0.20 0.08 0.13 0.12 0.21 0.05

9170 0.13 0.1 0.08 0.09 0.15 0.23 0.09 0.15 0.14 0.24 0.06

10000 0.15 0.12 0.1 0.11 0.17 0.26 0.11 0.18 0.17 0.28 0.07

8750 0.11 0.09 0.08 0.08 0.18 0.28 0.09 0.15 0.13 0.23 0.05

9580 0.14 0.11 0.09 0.1 0.21 0.32 0.1 0.17 0.16 0.26 0.07

11200 0.19 0.15 0.13 0.14 0.28 0.41 0.12 0.21 0.19 0.32 0.08

12100 0.22 0.17 0.15 0.16 0.31 0.46 0.13 0.22 0.21 0.36 0.09

10000 0.01 0.03 0.07 0.11 0.18 0.28 0.11 0.18 0.16 0.27 0.07

10800 0.01 0.03 0.08 0.13 0.20 0.31 0.12 0.21 0.18 0.29 0.08

11700 0.01 0.04 0.1 0.15 0.23 0.35 0.13 0.23 0.2 0.32 0.09

12500 0.01 0.04 0.11 0.17 0.26 0.39 0.14 0.26 0.23 0.35 0.1

13300 0.02 0.05 0.12 0.19 0.29 0.42 0.15 0.28 0.25 0.37 0.11

14200 0.02 0.06 0.14 0.22 0.32 0.46 0.17 0.32 0.28 0.41 0.12

12500 0.01 0.04 0.11 0.17 0.33 0.48 0.14 0.26 0.23 0.35 0.1

13300 0.02 0.05 0.12 0.19 0.36 0.53 0.15 0.28 0.25 0.37 0.11

14200 0.02 0.06 0.16 0.24 0.40 0.58 0.17 0.34 0.29 0.42 0.12

15800 0.02 0.07 0.18 0.27 0.48 0.68 0.19 0.38 0.34 0.47 0.14

16700 0.03 0.08 0.2 0.3 0.53 0.74 0.2 0.41 0.36 0.52 0.16

Gas Heat Electric Heat ID Coil

Low High1 Element2 Element Dry Wet 2” “2” 4” 4”

Throw-

away MERV 8 High Eff.

MERV14 High Eff

Economizer

70 RT-SVX34F-EN

Page 71

Table 47. 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 13 11 12 21 34 12 19 17 38 8

3540 21 16 14 15 26 41 17 26 24 45 10

3930 26 20 17 19 30 48 19 31 29 50 12

4320 31 24 21 23 36 55 22 36 34 57 15

4720 37 29 25 27 41 62 26 43 38 65 17

3540 21 16 14 15 26 41 17 26 24 45 10

3930 26 20 17 19 30 48 19 31 29 50 12

4320 31 24 21 23 36 55 22 36 34 57 15

5120 44 34 29 32 41 62 26 43 41 67 17

4130 29 22 19 21 44 68 22 36 31 55 13

4520 34 27 23 25 51 78 24 41 38 62 16

4920 41 32 27 29 66 97 29 50 46 77 19

5310 47 37 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

Startup

RT-SVX34F-EN 71

Page 72

Startup

Table 48. 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 31, p. 56 - Table 36,

p. 58 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.

WARNI NG

Rotating Components!

The exhaust fan will start anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.

Verify that the fans are operating properly and the CFM is within the job specifications. Refer to power exhaust fan performance tables beginning with Table 49, p. 73 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 (Reliatel Options Module). The setpoint is factory set at 25%. The exhaust fan(s) will come on anytime the economizer damper position 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 damper 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 economizer in order to relieve positive building pressure. If a Space Pressure Transducer failure occurs, the unit will revert back to fresh air tracking control.

5. The proportional offset between the dampers is adjusted under the rain hood by hole position selection on the power exhaust actuator jack shaft on the damper linkage arm.

Note: The damper is a barometric damper that continues

to function as a pressure relief damper up to the maximum stop position.

72 RT-SVX34F-EN

Page 73

Startup

Tracking Damper Minimum Adjustment Linkage

Note: To adjust the damper blade stops, refer to figures

Figure 51, p. 73 to Figure 54, p. 74

If the fan speed needs to be changed from the current operating speed, refer to the unit wiring diagram and the XTB1 and XTB2 terminal strip located in the economizer section.

Table 49. 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)

1.5 (min) 4.0 (max) 1.5 (min) 4.0 (max)

CFM

Table 50. Power exhaust fan performance — 40-50 Ton —

60 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (in)

Return Duct

Static (in. wc)

0.0 4854 8035 9708 16069

0.1 4575 7410 9151 14820

0.2 4262 6450 8552 13496

0.3 4011 6027 8021 12054

0.4 3718 5526 7436 11051

0.5 3467 5186 6933 10373

1.5 (min) 4.0 (max) 1.5 (min) 4.0 (max)

CFM

Table 52. Power exhaust fan performance — 33.3 - 41.7

Ton — 50 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

38.1

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)

101.6

(max)

L/s

38.1

(min)

101.6 (max)

Figure 51. (Upflow) Tracking exhaust damper

adjustment

Figure 52. (Horizontal) Tracking exhaust damper

adjustment

Table 51. Power exhaust fan performance — 22.9 - 29.2

To n — 5 0 H z

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

38.1

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)

101.6

(max)

L/s

RT-SVX34F-EN 73

38.1

(min)

101.6

(max)

Page 74

Startup

Less Exhaust

More Exhaust

Less Exhaust

More Exhaust

Figure 53. (Upflow) Standard exhaust maximum

damper position

Figure 54. (Horizontal) Standard exhaust maximum

damper position

2. Enter the calculated CFM from the previous section “Verifying Proper Airflow”

Ta bl e 43, 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 Total Return Static Pressure. Apply this calculation and the calculated CFM to the appropriate

Ta bl e 53, p. 74

through Ta b le 56, p. 75.

4. Set the drive rod swivel to the appropriate hole according to Ta bl e 53, p. 74 through Ta b le 56, p. 75. The units are shipped using hole “A” with no reference to any specific operating condition.

Table 53. 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

Economizer Damper Adjustment

Table 54. 27.5 - 35 Ton horizontal economizer (O/A)

damper static pressure setup

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

System Design

CFM 0.20 0.40 0.60 0.80 1.00 1.20 1.40

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 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 R/A duct losses. 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. Figure 55, p. 75 illustrates the damper assembly and Table 53, p. 74 through Table 56, p. 75 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.

74 RT-SVX34F-EN

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

Page 75

Startup

Table 55. 40 - 50 Ton downflow economizer (O/A)

damper static pressure setup

System Design

CFM 0.200.400.600.801.001.201.40

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 A A A B C D D

15500 A A A B C D D

16000 A A A B C C D

16500 A A A B B C D

17000 A A A B B C C

17500 A A A A B C C

18000 A A A A B C C

18500 A A A A B B C

19000 A A A A B B C

19500 A A A A B B B

20000 A A A A A B B

Return Air Duct Static +

Return Air Damper Static

(Inches of Water)

Drive Rod Position

Figure 55. Economizer (O/A) damper assembly

Manual Fresh Air Damper

Units ordered with the 25% manual fresh 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 fresh 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 switch that provides the supply power to the unit's power terminal block or the unit factory mounted disconnect switch.

Table 56. 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

17000 AAABDEE

17500 AAABDEE

18000 AAABCDE

18500 AAAACDE

19000 AAAABDE

19500 AAAABCE

20000 AAAABCD

Return Air Duct Static +

Return Air Damper Static

(Inches of Water)

Drive Rod Position

WARNING

Live Electrical Components!

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 Ta b le 31, p. 56 -

Ta bl e 36, p. 58, momentarily jump across the test

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 Ta bl e 57, p. 76, enter the desired amount of fresh air and the return air static pressure reading to obtain the proper damper opening dimension.

RT-SVX34F-EN 75

Page 76

Startup

Table 57. 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

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.

Starting the Compressor

Optional service valves must be fully opened before startup (suction, discharge, liquid line and oil line).

NOTICE:

Compressors Failure!

Unit must be powered and crankcase heaters energized at least 8 hours BEFORE compressors are started. This will protect the compressors from premature failure.

Starting 27.5 to 35 Ton Units

Install a set of service gauges onto the suction and discharge service ports. To 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 31, p. 56 - Table 36, p. 58 for the Cooling Test 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 56. 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 compressor 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 Units

Install a set of service gauges onto the suction 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 58,

p. 78 through Table 71, p. 84 to determine the proper

operating pressures for that circuit.

76 RT-SVX34F-EN

Page 77

Startup

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 61, p. 79 through

Table 71, p. 84 to determine the proper operating

pressures. For subcooling guidelines, refer to “Checking Subcooling” at the end of this section.

Units with Lead/Lag function disabled, jump across the “Test Terminals” once again. This will allow the third stage of cooling (number one circuit) to start providing the 3 minute “Off” time has been satisfied.

The 40 and 50 ton units employ the use of 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.

The location of the line weights is shown in Figure 57,

p. 77, and Figure 58, p. 77.

Figure 57. Line weight locations — 50 Ton

Figure 58. Line weight locations — 40 Ton

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 often accompanied by a high compressor amperage draw.

Refer to the Refrigeration system in the maintenance section for details on testing and replacing oil.

RT-SVX34F-EN 77

Page 78

Startup

TC, TE, YC* 330

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

10 0 110 1 20 130 140 150 16 0 170 18 0 1 90 200

Suction Pressure (Psig)

Discha rge Press ure (Psig)

55 F OD Ambi ent

85 F OD Ambient

75 F OD Ambi ent

65 F OD Ambien t

115 F OD Ambi ent

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 14 0 150 16 0 170 180 1 90 200

Suct ion Pressure (Psig)

Discha rge Press u re (Psig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambient

65 F OD Ambi ent

115 F OD Ambient

105 F OD Ambient

95 F OD Ambi ent

Table 58. 27.5 Ton — operating pressure (60Hz)

68/ 57 F ID W B/DB

74/62 F ID WB/DB

80/67 F ID WB/DB

Table 59. 30 Ton — operating pressure (60 Hz)

86/ 72 F ID WB /DB

68/57 F ID WB/D B

78 RT-SVX34F-EN

74/62 F ID WB/DB

80/67 F ID WB/D B

86/72 F ID WB/DB

Page 79

Table 60. 35 Ton — operating pressure (60 Hz)

TC, TE, YC* 420

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

Suct ion Pre ssure ( Psig)

Discha rge Press u re (Psig)

55 F OD Ambi ent

85 F OD Ambi ent

75 F OD Ambient

65 F OD Ambi ent

115 F OD Ambie nt

105 F OD Ambient

TC, TE, YC* 480 Circuit # 1

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

Suct ion Pre ssure ( Psig)

Discha rge Press u re (Psig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambi ent

65 F OD Ambient

115 F OD Ambient

105 F OD Ambien t

95 F OD Ambi ent

Startup

68/57 F ID WB/D B

74/62 F ID WB/D B

80/67 F ID WB/D B

86/72 F ID WB/DB

5 F OD Ambien t

Table 61. 40 Ton dual circuit — operating pressure (60 Hz)

86/72 F ID WB/D B

80/67 F I D WB /DB

68/57 F ID WB/D B

74/62 F ID WB/D B

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Page 80

Startup

TC, TE, YC* 480 Circuit #2

Full Load

200

250

300

350

400

450

500

550

600

650

700

100 110 120 130 14 0 150 16 0 170 180 1 90 200

Suct io n Pressu re (Psig )

Discha rge Press ure (P sig)

55 F OD Ambi ent

85 F OD Ambi ent

75 F OD Ambient

65 F OD Ambien t

115 F OD Ambie nt

105 F OD Ambi ent

95 F OD Ambi ent

TC, TE, YC* 600 Circuit # 1

FUL L LO AD

200

250

300

350

400

450

500

550

600

650

700

100 11 0 120 13 0 140 15 0 160 17 0 180 1 90 200

Suctio n Pres sure (Psig)

Discharge Pressure (Psig)

55 F OD Ambien t

85 F OD Ambient

75 F OD Ambient

65 F OD Ambient

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

Table 62. 40 Ton dual circuit — operating pressure (60 Hz)

68/ 57 F I D WB/DB

74/62 F ID WB/DB

80/6 7 F ID WB/D B

86/ 72 F ID WB/ DB

Table 63. 50 Ton dual circuit — operating pressures (60 Hz)

68/57 F ID WB/D B

74/62 F ID WB/DB

80/67 F ID WB/DB

86/72 F ID WB/DB

80 RT-SVX34F-EN

Page 81

Table 64. 50 Ton dual circuit — operating pressures (60 Hz)

TC, TE, YC* 600 Circuit # 2

FUL L LO AD

200

250

300

350

400

450

500

550

600

650

700

100 110 12 0 130 14 0 150 160 170 180 1 90 200

Su ct ion P res sur e ( Psi g)

Discha rge Pr ess ure (P sig)

55 F OD Ambient

85 F OD Ambi ent

75 F OD Ambient

65 F OD Ambi ent

115 F OD Ambient

105 F OD Ambi ent

95 F OD Ambient

TC, TE, YC* 275

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

Suct ion P re ssure ( Psig)

Disc harge Pr ess ure (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambi ent

65 F OD Ambient

115 F OD Ambient

105 F OD Ambient

95 F OD Ambi ent

Startup

68/57 F ID WB/DB

74/62 F ID WB/ DB

80/67 F ID WB/DB

Table 65. 22.9 Ton — operating pressure (50 Hz)

86/72 F I D WB /DB

86/ 72 F ID WB/DB

68/57 F ID W B/DB

74/62 F ID W B/DB

80/67 F ID WB/DB

RT-SVX34F-EN 81

Page 82

Startup

TC, TE, YC* 305

FULL LOAD

200

250

300

350

400

450

500

550

600

650

700

100 110 12 0 130 14 0 150 16 0 170 180 190 200

Suct ion Pressure (Psig)

Disc harge Pre ssu re (Psig)

55 F OD Ambient

85 F OD Ambi ent

75 F OD Ambient

65 F OD Ambient

11 5 F OD Ambi ent

10 5 F OD Ambi ent

95 F OD Ambient

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 1 90 200

Suct ion Pre ssure (Psi g)

Discha rge Press ure (P sig)

55 F OD Ambient

85 F OD Ambient

75 F OD Ambient

65 F OD Ambi ent

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

Table 66. 25.4 Ton — operating pressure (50 Hz)

68/57 F ID WB/DB

74/ 62 F ID WB/D B

80/67 F ID WB/DB

Table 67. 29.2 Ton — operating pressures (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

82 RT-SVX34F-EN

Page 83

Table 68. 33.3 Ton dual circuit — operating pressure (50 Hz)

TC, TE, YC* 400 Circuit #1

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 800 900 1 000 110 0 1200 1300

Suct ion Pre ssur e (KPa)

Discha rge Press ure (KPa )

DB /WB

12. 8 F OD Amb ient

29. 4 F OD Amb ient

23.9 F OD Ambi ent

18.3 F OD Ambi ent

46.1 F OD Ambi ent

40.6 F OD Ambi ent

35.0 F OD Ambient

DB/WB

TC, TE, YC* 400 Circuit #2

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 8 00 900 1 000 1 100 12 00 1300

Suct ion Pressu re (K Pa)

Discha rge Pres su re (KPa )

12.8 F OD Ambient

29.4 F OD Ambi ent

23.9 F OD Ambi ent

18.3 F OD Am bient

46.1 F OD Ambient

40.6 F OD Ambi ent

35. 0 F OD Ambi ent

DB/ WB

DB /WB

DB/WB

Startup

20.0/13.9 C ID

23.3 /16.7 C I D

26.7/ 19.4 C ID

30.0/22.2 C ID

Table 69. 33.3 Ton dual circuit — operating pressure (50 Hz)

26. 7/19.4 C ID

20.0 /13.9 C I D

23.3/1 6.7 C ID

RT-SVX34F-EN 83

30.0/22.2 C ID

Page 84

Startup

TC, TE , YC* 500 Circuit #1

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 8 00 900 1 000 110 0 12 00 1300

Suct ion Pre ssur e (KPa)

Discha rge Press u re (KPa)

DB/ WB

12.8 F OD Ambi ent

23.9 F OD Ambient

18. 3 F OD A mbi ent

46. 1 F OD Ambi ent

40.6 F OD Ambient

35.0 F OD Ambient

DB/WB

DB/W B

TC, TE, YC* 500 Circuit #2

Full Load

1200

1700

2200

2700

3200

3700

4200

600 700 800 900 1000 110 0 12 00 1300

Suct ion Pre ssure (K Pa)

Disc harge Press ure (KPa)

DB/W B

12. 8 F OD A mbi ent

29. 4 F OD Ambi ent

23.9 F OD Amb ie nt

18.3 F OD Ambient

46. 1 F OD Ambien t

40.6 F OD Ambient

35.0 F OD Ambient

DB/ W B

DB/WB

DB/W B

Table 70. 41.7 Ton dual circuit — operating pressures (50 Hz)

20.0 /13.9 C ID

23. 3/16.7 C ID

26. 7/19.4 C ID

Table 71. 41.7 Ton dual circuit — operating pressures (50 Hz)

30.0/ 22.2 C ID

9.4 F O D Ambie nt

26.7/ 19.4 C ID

20. 0/13.9 C ID

23.3 /16.7 C ID

84 RT-SVX34F-EN

30.0 /22.2 C ID

Page 85

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 differentiate 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 which 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 “Off” 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, measuring the operating pressures can be meaningless.

With the unit operating at “Full Circuit Capacity”, acceptable subcooling ranges between 14° F to 22° F.

Measuring Subcooling

WARNI NG

R-410A Refrigerant under Higher Pressure 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 thoroughly where the temperature sensor will be attached. After 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 subcooling 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 Test Guide in Table 31, p. 56 - Table 36, p. 58 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-SVX34F-EN 85

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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 ignition systems (if applicable) when going through the test procedures.

Once the ignition system and ignitors have been checked, open the main power disconnect switch to reset the RTRM.

WARN ING

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 installation, 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. 36 for the proper gas supply pressure and Figure 33, p. 37 for the location of the gas pressure taps.

Close the main power disconnect switch and start the first stage heating Test again. Wait approximately 60 seconds for the heater to switch to low fire and check 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.

WARNI NG

Hot Surfaces!

Surface temperatures may exceed 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 units with modulating gas will initiate the second heater bank to fire and both banks will operate at high fire. The manifold 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 heating stage. Refer to the heater electrical data in

Table 8, p. 26 (60 Hz) and Table 11, p. 27 (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. Follow the Test guide in Table 31, p. 56 - Table 36, p. 58 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 RTRM 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 switch and the “Zone Temperature” 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.

86 RT-SVX34F-EN

Page 87

For Single Zone Variable Air Volume  Units

Verify that the “Mode” selection switch and the “Zone Temperature” 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 potentiometers 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 place.

Startup

RT-SVX34F-EN 87

Page 88

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. 12).

• Rigging the unit. Refer to Figure 12, p. 19.

• Placing the unit on curb; check for levelness. See “Roof

Curb and Ductwork” on page 13.

• 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. 21.

• Service Valve Option; See “Starting the Compressor”

on page 76.

• Return/Fresh-air damper adjustment. Refer to

“Economizer Damper Adjustment” on page 74.

• Exhaust Fan Damper Stop Adjustment. Refer to Exhaust Damper Adjustment figures, beginning with

Figure 51, p. 73.

Electrical Requirements

WARNING

Proper Field Wiring and Grounding Required!

(See Figure 18, “Typical field power wiring,” on page 24.)

• 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 19, p. 30 and Figure 20, p. 31.)

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 28 for guidelines.

• Complete the field wiring connections for the variable air volume controls as applicable. Refer to the

Voltage Wiring” on page 28 for guidelines.

“Low

Gas Heat Requirements

(See “Installation Piping” on page 36.)

• 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 checked with a soap solution. 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.

88 RT-SVX34F-EN

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Sequence of Operation

Mechanical Cooling Sequence  Of Operation

Time delays are built into the controls to increase reliability and performance by protecting the compressors and maximizing unit efficiency.

Units Without an Economizer

For 27.5 to 35 Ton units, when mechanical cooling is required, the RTRM energizes the Compressor Contactor (CC1) coil. When the CC1 contacts close, the Compressor CPR1 and Outdoor Fan Motor (ODM1) will start providing the 3 minute “off” time has elapsed. ODM2 and ODM3 cycles off/on based on the outdoor ambient temperature as measured by the Outdoor Air Sensor (OAS). CPR1 cycles off as required providing the 3 minute “on” time has elapsed.

With CPR1 operating for a minimum of 3 minutes. If additional cooling is required, the RTRM energizes the 2nd compressor contactor (CC2) to bring on CPR2. While CPR1 continues to run, CPR2 cycles on/off as needed to meet the cooling requirements.

For 40 Ton constant volume and variable air volume applications, once CPR1 has operated for a minimum of 3 minutes, and additional cooling is required, the RTRM cycles CPR1 off and energizes compressor contactor CC2. If additional cooling is required, the RTRM energizes compressor contactor (CC1) providing CPR1 has been off for a minimum of 3 minutes. This configuration will allow the dual circuit unit to operate with three steps of cooling if CPR1 is the lead compressor.

For 50 Ton constant volume and variable air volume applications, once CPR1 has operated for a minimum of 3 minutes, and additional cooling is required, the RTRM cycles CPR1 off and energizes compressor contactors CC2 and CC3 simultaneously. If additional cooling is required, the RTRM energizes compressor contactor (CC1) providing CPR1 has been off for a minimum of 3 minutes. This configuration allow the dual circuit unit to operate with three steps of cooling if CPR1 is the lead compressor.

If the indoor Fan selection switch is set to the “AUTO” position on constant volume applications, the RTRM energizes the Indoor Fan Contactor (F) coil approximately one second after energizing first stage compressor contactor (CC1). When the cooling cycle is complete and CC1 is de-energized, the RTRM keeps the Fan on for approximately 60 seconds to enhance unit efficiency. On variable air volume applications, the Fan operates continuously.

Economizer Operation Based on Dry Bulb

Standard economizer dry bulb change over has five field selectable temperatures 55, 63, 67, 70, 73°F. Refer to

Table 25, p. 49 for the proper potentiometer setting for

each temperature selection.

The economizer option allows cooling utilizing outdoor air when the temperature is below the specified dry bulb setpoint (73° ±2°F factory setting). The air is drawn into the unit through modulating dampers. The ECA modulates the economizer dampers from minimum position to full open based on a 1.5°F control point below either the space temperature setpoint for constant volume applications or

1.5°F around the supply air temperature setpoint for

variable air volume applications.

If the Mixed Supply Air Sensor (MAS) senses that supply air temperature is too cold, the dampers are held in their current position until the supply air temperature rises, or begin to modulate toward the minimum position if the supply air temperature continues to drop.

The economizer control allows fully integrated cooling operation between the compressor(s) and the economizer when needed to satisfy the cooling setpoint. The RTRM will not allow a compressor to operate until the economizer dampers have been fully open for at least three minutes. The RTRM evaluates the rate of temperature change during this delay and will energize compressor(s) as needed to maintain temperatures within setpoint deadbands.

If a power exhaust option is installed:

2. Physical damper blade “stops” that 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

3. The modulating power exhaust actuator is a slave to the position of the economizer damper actuator such that the power exhaust dampers proportionally follow or track the fresh air damper position. The proportional offset between the dampers is adjusted under the rain hood by hole position selection of the power exhaust actuator jack shaft on the damper linkage arm.

4. When the Statitrac™ option is selected, the Exhaust Blade Actuator will modulate independently to the economizer in order the relieve positive building

RT-SVX34F-EN 89

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Sequence of Operation

pressure. If the space pressure transducer fails, the unit will revert back to fresh air tracking control.

Economizer Operation Based on Reference Enthalpy

Reference enthalpy is accomplished by using an Outdoor Humidity Sensor (OHS). The reference enthalpy is field selectable to one of five standard enthalpies. Refer to

Table 25, p. 49 for the proper potentiometer setting for

each enthalpy selection.

If the outdoor air enthalpy is greater than the selected reference enthalpy, the economizer will not operate and the damper will not open past the minimum position setting.

If the outdoor air enthalpy is less than the reference enthalpy, the dampers will modulate to maintain a 45° to 55° F minimum supply air temperature (constant volume or variable air volume applications). The ECA modulates the economizer dampers from minimum position to fully open based on a 1.5° F control point below either the space temperature setpoint for constant volume applications or

1.5° F below the discharge air temperature setpoint for variable air volume applications. With reference enthalpy control, reference enthalpy is not allowed if the outdoor temperature is below 32° F. Below 32° F, dry bulb economizer control is enabled.

If communications between the Outdoor Humidity Sensor (OHS) and the Economizer Actuator Control (ECA) were to fail, the economizer will operate using the dry bulb parameters.

Figure 59. Humidity vs. current input

Economizer Operation Based on Comparative Enthalpy

Comparative enthalpy is accomplished by using an outdoor humidity sensor (OHS), return humidity sensor (RHS), and the return air sensor (RAS).

If the outdoor air enthalpy is greater than the return air enthalpy, the economizer will not operate and the damper will not open past the minimum position setting. The economizer will not operate at outdoor air temperatures above 75°F.

If the outdoor air enthalpy is less than the return air enthalpy, the dampers will modulate to maintain a 45° to 55°F supply air temperature (constant volume or variable air volume applications). The ECA modulates the economizer dampers from minimum position to fully open based on a 1.5°F control point below either the space temperature setpoint for constant volume applications or

1.5°F around the supply air temperature setpoint for

variable air volume applications. Refer to Figure 59, p. 90 for the Humidity versus Voltage Input Values.

If either or both the return air humidity sensor (RHS) or the return air sensor (RAS) fails, the economizer will operate using the reference enthalpy setpoint perimeters.

Dehumidification (Modulating Hot Gas Reheat) Sequence of Operation

When the relative humidity in the controlled space (as measured by the sensor assigned to space humidity sensing) rises above the space humidity setpoint, compressors and the supply fan will energize to reduce the humidity in the space. All compressors on both refrigerant circuits will be staged up during active dehumidification.

A Voyager Commercial Rooftop unit can contain one or two refrigerant circuits. Units with dehumidification will have one circuit with an outdoor condenser coil located in the outdoor section for normal head pressure control and a reheat coil located in the indoor air stream section for supply air reheat; both coils are for the same circuit. For 4050 ton Voyager Commercial units the reheat circuit is circuit# 2. For 27.5-35 ton Voyager Commercial units there is only one circuit.

During dehumidification mode, the CLV and RHP will modulate which will allow refrigerant to flow through both the condenser coil and the reheat coil. The RHP will be deenergized when in dehumidification mode.

During dehumidification mode, the Supply Air Temperature is controlled to the Supply Air Reheat Setpoint by controlling the reheat and cooling modulating valve position. The range for the Supply Air Reheat Setpoint is 65°F to 80°F and the default is 70°F. The Supply Air Reheat Setpoint is adjusted by using a potentiometer on the RTOM.

90 RT-SVX34F-EN

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Sequence of Operation

During cooling operation, the cooling valve (CLV) will be open 100% and the reheat valve (RHV) will be closed which will allow refrigerant to flow through the condenser coil and not the reheat coil. During cooling mode the reheat pump-out solenoid (RHP) will also be energized to allow refrigerant to be removed from the reheat coil.

During cooling or dehumidification mode, to ensure proper oil distribution throughout the reheat and cooling condenser circuits, a purge is initiated by a hard coded purge interval timer. After the purge interval timer reaches 60 minutes, the unit performs a purge for a fixed 3-minute time period. During this state the reheat and cooling valve will be driven 50% and the reheat pump-out solenoid is energized.

See Dehumidification Low Pressure Control section for the reheat low pressure control (RLP) function during active dehumidification.

See Dehumidification Frost Protection section for the control scheme during active dehumidification.

See the Condenser Fan / Compressor sequence section for Condenser fan staging during active dehumidification.

Sensible cooling or heating control overrides dehumidification control. For both multi-circuit and single circuit units, any sensible heating request will terminate dehumidification control. If heating is active at the time a call for dehumidification control is received the heating operation must complete and an additional 5 minutes from the time heat is terminated must elapse before dehumidification will be allowed.

Note: Occupied VAV operation in cooling mode will

consider a critical zone temperature and when the sensible cooling requirements of this zone are not being met, the unit will terminate dehumidification control.

Note: Occupied CV and all unoccupied operation will

terminate dehumidification if the sensible zone cooling requirements exceeds one-half the available cooling capacity of the unit.

Gas Heat Sequence Of Operation

When heating is required, the RTRM initiates the heating cycle through the ignition control module (IGN). The IGN normally open contacts close to start the combustion blower motor (CBM) on high speed. Next, the IGN control energizes the hot surface igniter (IP) for 45 seconds. After a preheat period, the gas valve (GV) is energized for approximately 7 seconds. If the burner lights, the gas valve remains energized. If the burner fails to ignite, the ignition module will attempt two retries and then lock out if flame is not proven. The unit will attempt to ignite at 60 minute intervals until the heating call is removed.

An IGN lockout due to flame loss can be reset by:

1. Open and close the main power disconnect switch.

2. Switch the MODE switch on the zone sensor to “Off” and then to the desired position (VAV units – remove and reapply the mode input).

3. Allow the IGN to reset automatically after one hour.

When ignition takes place, the hot surface igniter (IP) is deenergized and functions as the flame sensor.

Two Stage—If, after 60 seconds, the unit requires 1st stage heating only, the IGN will change the combustion blower from high speed to low speed. If additional heating is required and first stage heat has been operating for a minimum of 10 seconds, the IGN inducer relay will change the combustion blower motor (CBM) to high speed, delivering second stage heat capacity.

Modulating—Units with modulating heat will fire the modulating bank first at high fire for 60 seconds. The unit will then modulate the heater to the necessary rate. If the modulating heat bank cannot satisfy the zone needs alone, the second bank will come on and the modulating will find the appropriate operating point.

Constant Volume (CV) Unit Fan Operation

If the Fan selection switch is in the “AUTO” position for constant volume units, the RTRM will delay starting the supply fan for 60 seconds to allow the heat exchanger to warm up. When the zone temperature rises above the heating setpoint, the IGN control module will terminate the heat cycle. The supply fan remains energized for an additional 90 seconds.

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

During Unoccupied heating, Morning Warm up, and Daytime Warm up mode, the VFD must be at 100%. Therefore, before the unit can heat, the VHR relay must have been energized for at least 6 minutes to ensure that the VAV boxes have driven to maximum. For example, 6 minutes after a Daytime Warm up mode is initiated, the VFD output will go to 100% and then the heat cycle will begin. The VHR relay is energized during Unoccupied mode, Morning Warm up mode, and Daytime Warm up mode.

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Sequence of Operation

Variable Air Volume (VAV) Unit Fan Operation (Modulating Gas Heat Only)

During Changeover Heat (LTB5-1 shorted to LTB5-2), the unit will heat to the Supply Air Heating Setpoint +/- 7ºF. The VFD will modulate to maintain the Static Pressure Setpoint.

Ignition Control Module

There is a green LED located on the ignition module. Any time the Ignition module is powered, the LED will be on to provide status of the ignition system.

• Steady OFF - no power/ internal failure

• Steady ON - no diagnostic, no call for heat

• Slow flash rate ¾ second on, ¼ second off - normal call for heat

Error Code Flashes

• One flash - Communication loss between RTRM and IGN

• Two flashes - System lockout; failed to detect or sustain flame (3 tries, lockout after 3rd try)

• Three flashes - Not used

• Four flashes - High limit switch TCO1, TCO2, or TCO3 open (auto reset)

• Five flashes - Flame sensed and gas valve not energized; or flame sensed and no call for heat (auto reset)

The pause between groups of flashes is approximately two seconds.

High Temperature Limit Operation and Location

All of the heater limit controls are automatic reset. The high limit cutouts (TCO1) and/or (TCO3) protect against abnormally high supply air temperature. The fan failure limit (TCO2) protects against abnormally high heat build up due to excessive high limit (TCO1) (TCO3) cycling if the indoor fan motor (IDM) fails. If TCO1, TCO2, or TCO3 open during a heating call, the heat will shut down and the supply fan will be forced to run. The heat will automatically restart should the TCO circuit re-close during an active heating call. While the TCO circuit is open, a heat fail diagnostic will be sent from the IGN to the RTRM.

The TCO1 and TCO3 is located in the bottom right corner of the burner assemblies on both downflow and horizontal units. TCO2 is located on the IDM partition panel; below and to the right of the blower housing on downflow units. On horizontal units, TCO2 is located on the IDM partition panel above the blower housing.

Electric Heat Sequence Of Operation

Constant Volume (CV)

When heat is required and the Fan selection switch is in the “AUTO” position for constant volume applications, the RTRM energizes the Supply Fan approximately one second before energizing the first stage electric heat contactor (AH). A 10 seconds minimum “off” time delay must elapse before the first stage heater is activated. When the heating cycle is completed, the RTRM deenergizes the Fan and the heater contactor (AH) at the same time.

The RTRM cycles the first stage of heat as required to maintain zone temperature. If the first stage cannot satisfy the heating requirement, the RTRM energizes the second stage electric heat contactors (BH) and (CH) providing first stage has been on for at least 10 seconds or the second stage has been off for at least 10 seconds. (CH contactor is used on 54KW and larger heaters.)

The RTRM cycles the second stage electric heat as required to maintain the zone temperature.

Variable Air Volume (VAV)

During Unoccupied heating, Morning Warm up, or Daytime Warm up, the VHR relay will be energized for at least 6 minutes and the VFD output will go to 100%. The heaters will stage on and off to satisfy the zone temperature setpoint.

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

Occupied Cooling Operation

For normal Cooling operation, available Cooling capacity will be staged or modulated in order to meet the calculated discharge air setpoint between the user selected upper and lower limits. If the current active cooling capacity is controlling the discharge air within the deadband no additional Cooling capacity change will be requested. As the Discharge Air Temperature rises above the deadband the control will request additional capacity as required (additional compressor operation or economizer). As the Discharge Air Temperature falls below the deadband the algorithm will request a reduction in active capacity.

Economizer Cooling

During normal Economizer Cooling, the fan speed will operate at its minimum. However, if the economizer is able to meet the demand alone, due to desirable ambient conditions, the supply fan speed will be allowed to increase above the minimum prior to utilizing mechanical cooling. Note that Economizer Enable/Disable decisions

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Sequence of Operation

will be made based on the previous sections, however, the economizer control point will now be variable based on the zone cooling demand.

Economizer Enabled at Cooling Start. Once the unit

has a request for economizer cooling and the unit has met all Cool mode transition requirements, the Economizer will open beyond minimum position in order to meet the calculated discharge air setpoint value. If the economizer at 100% alone cannot meet the active discharge air setpoint, the Supply Fan Speed will remain at 58% for 3 minutes. Once the 3 minute compressor inhibit delay has expired, compressors will be allowed to energize to meet the space demand. The supply fan speed output will continue to modulate in order to meet the zone cooling requirements.

Once compressors are being utilized for additional cooling capacity, the economizer will be forced to 100% if enabled. As the cooling capacity begins to stage back (less cooling load) the economizer will remain at 100%, if enabled, until all compressors have de-energized.

Economizer Enabled to Disabled. If the economizer is

enabled and the unit is actively cooling with the economizer, if the economizer becomes disabled the economizer will be closed to the active minimum position and compressors will be allowed to stage without delay if the minimum off timers have expired and there is a Cooling demand requesting compressor operation. During this transition, the fan will continue to modulate in order to meet the space demand.

Economizer Disabled to Enabled. If compressors are

energized for Cooling and the economizer was disabled, but becomes enabled due to desirable ambient conditions, the economizer will be forced to 100% as on traditional VAV units.

Compressor Cooling

Compressor output control and protection schemes will function much like on non-SZ VAV units. Normal compressor HPC and LPC control will remain in effect as well as normal 3-minute minimum on, off, and inter-stage timers. Also, the condenser fans will be controlled as on non-SZ VAV units and compressor staging sequences will be as described in Table 21 above based on unit tonnage configuration and lead/lag status.

Cooling Sequence. If the control determines that there

is a need for compressor stages in order to meet the discharge air requirements, once supply fan proving has been made, the unit will begin to stage compressors accordingly. Note that a 5 second delay will be enforced between the command for supply fan output operation and the command for compressor output operation. This delay is enforced to ensure that the supply fan is energized and ramping up to operating speed prior to energizing compressors.

As the zone cooling demand continues to increase, if additional capacity is required, the supply fan output will be modulated above minimum speed in order to meet the zone requirements. Note that the supply fan speed will remain at the compressor stage's associated minimum value until the control requires additional capacity to meet the zone demand.

As the cooling load in the zone decreases the control will reduce the speed of the fan down to minimum per compressor stage and control the compressor outputs accordingly. As the compressors begin to de-energize, the Supply Fan speed will fall back to the Cooling Stage's associated minimum fan speed but not below. As the load in the zone continues to drop, cooling capacity will be reduced in order to maintain the calculated discharge air setpoint.

Cooling Stages Minimum Fan Speed. As the unit

begins to stage compressors to meet the cooling demand, the following minimum Supply Fan Speeds will be utilized for each corresponding Cooling Stage. Note that the Supply Fan Speed will be allowed to ramp up beyond the minimum speed in order to meet the zone cooling demand.

2-Stage Cooling Units (27.5-35T Units)

The minimum fan speed for units with 2 stages of DX Cooling will be 58% of the unit's full airflow capacity. At Stage 1 of DX Cooling the Fan Speed will be at a minimum of 58% and at Stage 2 of DX Cooling the Fan Speed will be at a minimum of 67%.

3-Stage Cooling Units (40-50T Units)

The minimum fan speed for units with 3 stages of DX Cooling will be 58% of the unit's full airflow capacity. At Stage 1 of DX Cooling the Fan Speed will be at a minimum of 58% and at Stages 2 and 3 of DX Cooling the Fan Speed will be at a minimum of 67%.

Occupied Heating Operation

Occupied Heating operation on units configured with Single Zone VAV control will utilize two separate control methodologies based on heating configurations. For all “Staged” Heating types (Electric and Gas), the unit will utilize 100% full airflow during all active heating periods like traditional Constant Volume units. For Modulating Gas heat units, the unit will have the ability to control the discharge air temperature to the calculated discharge air heating setpoint in order to maintain the Zone Temperature to the Zone Heating setpoint.

Staged Heating Operation

For units configured with Staged Heat once the control determines that there is an active heating capacity request, the unit will energize the Supply Fan and ramp up to full speed. The control methodology during Active Heating on units configured with Staged Heat types will be identical to traditional Constant Volume units; heating

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Sequence of Operation

stages will be energized/de-energized to meet the Zone Heating demand. Note that all Electric and Gas Heat staging sequences will be identical to as on Constant Volume units.

Modulating Heat Operation with SZVAV Heating

Units configured with Modulating Gas Heat will utilize true Single Zone VAV control in the same manner as during Active Cooling.

Heating Sequence. Once the unit has met all Auto-

Changeover requirements and the control determines that there is a space heating demand, the unit will transition into zone heating. Once the Discharge Air Temperature falls below the calculated discharge air temperature setpoint, the unit will initiate the Modulating Heat output request and control the supply fan at minimum speed. At this point, the Modulating Heat output will be controlled to maintain the discharge air temperature requirements and the supply fan speed will be controlled between 58%-10 0% to meet the zone heating requirements.

As the heating load in the zone decreases the fan speed will decrease down to minimum (58%) and control the modulating heat output as necessary to meet the discharge air heating requirements. As the load in the zone continues to drop the fan speed will be maintained at this minimum airflow and the modulating heat output will be controlled accordingly.

Note: The gas heat staging sequences will be the same on

SZ VAV units as on traditional CV units.

Unoccupied Cooling and  Heating Operation

For SZ VAV units, the unit will control Heating, Cool, and Dehumidification as during Occupied periods using the normal heating and cooling Single Zone VAV algorithms. In Unoccupied periods the unit will utilize setback setpoints, a 0% Minimum OA Damper position, and Auto fan mode operation as on normal Constant Volume units.

Dehumidification Operation

Singe Zone VAV units support modulating dehumidification operation. Most functions will be identical to dehumidification control on CV and Traditional VAV units.

Modulating Dehumidification

Entering Dehumidification. At startup a zone heating

or cooling demand will prevent dehumidification operation as on a non-Single Zone VAV unit. At this point the unit will perform normal sensible cooling or heating control until the respective setpoint is satisfied.

After startup, the unit will monitor the unit conditions to determine when to enter and leave dehumidification mode. As long as the unit is not actively heating or actively

cooling with more than half the unit design mechanical cooling capacity and it has not been disabled due to the Override limits described below, dehumidification mode will be allowed.

When dehumidification mode is entered the unit will:

1. Energize the Supply Fan, if not already ON, and ramp the Fan Speed output up to 80% airflow.

2. Stage up all compressors with ~2 seconds between stages.

3. Command the OA damper to minimum position.

4. The Supply Air Reheat setpoint (R130 located on the RTOM) will become the maximum discharge air control setpoint.

5. The reheat and cooling valves will be modulated to meet the calculated discharge air setpoint.

Leaving Dehumidification. On a call to leave

dehumidification mode the unit will perform the following:

1. Mechanical cooling will stage back to 50% (Cool 1) of the available capacity then will be released to normal Single Zone VAV control to meet the space demand.

2. The economizer will be released to normal control.

3. The Supply Fan output will be released to meet the space load.

4. The cooling valve will be driven to 100% and the reheat valve will be driven to 0%.

5. The Reheat Pumpout relay will be energized if the reheat circuit is requested or de-energized if the reheat circuit de-energizes.

Typical causes to leave dehumidification are:

1. Space humidity levels have fallen below the Active Occ/Unocc Dehumidification Setpoint -5% Dehumidification Hysteresis Offset,

2. The zone temperature has dropped too close to the Zone Heating Setpoint in any unit mode (Zone Temp. ZHSP + 0.5°F).

3. The zone temperature rises above the Zone Cooling Setpoint +2°F in any unit mode.

4. Entering Evaporator Temperature falls too low or Froststat input becomes active.

5. Dehumidification/Reheat becomes disabled.

Dehumidification Overrides. Sensible cooling or

heating control overrides dehumidification control. Any heating request will terminate dehumidification control. If heating is active at the time a call for dehumidification control is received the heating operation must complete and an additional 5 minutes from the time heat is terminated must elapse before dehumidification will be allowed. Dehumidification will also be disabled if any of the functional disables that apply to CV or traditional VAV have gone active.

≤

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Sequence of Operation

Purge Mode (Comfort and Dehumidification).

Purge cycle operation will operate identically to Purge on non-Single Zone VAV Dehumidification units; if the Reheat Circuit operates in one mode (dehumidification or cooling) for a cumulative 60 minutes the unit will initiate a 3-minute Purge cycle with all compressors energized, the Cooling and Reheat Valves at 50%, and the Reheat Pumpout relay de-energized.

During an active Purge Cycle the Supply Fan Speed will operate at the appropriate speed based on the active compressor step. If a dehumidification purge is initiated, the unit will run at 80%, if performing a cooling purge the supply fan will track based on the appropriate minimum speed for the associated number of compressors energized. After the Purge Cycle is complete, the Supply Fan will be released to normal control based on the Cooling/Dehumidification demand.

Dehumidification - Humidistat Operation. A

humidistat input located on the Options module will be supported as on non-SZ VAV.

Other Dehumidification Related Topics. The

following aspects of Single Zone VAV units configured with Modulating dehumidification will operate identically to non-Single Zone VAV units:

1. Outdoor Fan Control.

2. Low Pressure/High Pressure Cutout input handling.

3. Function Enable/Disable Details.

Failure and Overriding Conditions

Certain failure and overriding conditions require special handling of the Supply Fan Speed on units configured with Single Zone VAV. See below for a list of these conditions:

1. Supply Fan Proving Failure - If a Supply Fan Proving failure is detected the Supply Fan will be de-energized after 40s of run time and the Fan Speed output will go to 0 Vdc (0%).

2. Ventilation Override Mode - If a VOM goes active in which the Supply Fan is commanded ON (Purge, Pressurize, etc.) the Supply Fan will be energized and the Fan Speed output will ramp to 100%.

3. Zone Temperature Sensor Failure - If the Active Zone Temperature input goes out of range, the unit will discontinue all Heating, Cooling, and Dehumidification operation.

4. Supply Air Temperature Sensor Failure - If the Supply Air Temperature input goes out of range, the unit will revert back to Full Airflow, Traditional CV control. The unit will call out a Supply Air Temperature Sensor Failure Alarm, the RTRM System LED will flash the 2blink error code, and the Zone Sensor Heat (Modulating Heat Only) and Cool LEDs will flash.

5. Frostat Failure - If the unit has a Froststat Failure occur, all active Heating, Cooling, and Dehumidification will

be de-energized immediately and the Supply Fan will ramp up to 100%.

6. Heat Failure (High Temp. Limit Trip) - If a unit configured with Gas Heat has a High Temp. Limit trip the Supply Fan will be requested to remain ON and the Fan Speed output will ramp to full speed.

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

When the LPC is opened for one (1) continuous second, the compressor for that circuit is turned off immediately. The compressor will not be allowed to restart for a minimum of three (3) minutes.

If four consecutive open conditions occur during the first three minutes of operation, the compressor will be locked out, a diagnostic communicated to ICSTM if applicable, and a manual reset will be required to restart the compressor.

High Pressure Control and Temperature Discharge Limit (ReliaTel Control)

The Temperature Discharge Limit (TDL) is located in the Compressor Output circuit and is connected in series with the High Pressure Control (HPC). The RTRM will register an auto reset lockout if either the high pressure control switch or the temperature discharge limit opens during compressor operation. If the compressor output circuit is opened four consecutive times during compressor operation, the RTRM will generate a manual reset lockout.

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Maintenance

Fan Belt Adjustment

The Supply Fan belts must be inspected periodically to assure proper unit operation.

Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a matched set of belts to ensure equal belt length. When installing new belts, do not stretch them over the sheaves; instead, loosen the adjustable motor-mounting base.

Once the new belts are installed, adjust the belt tension using a Browning or Gates tension gauge (or equivalent) illustrated in Figure 60.

Figure 60. Typical belt tension gauge

Note: The actual belt deflection force must not exceed the

maximum value shown in Figure 61, p. 96.

7. Recheck the new belt's tension at least twice during the first 2 to 3 days of operation. Readjust the belt tension as necessary to correct for any stretching that may have occurred. Until the new belts are “run in”, the belt tension will decrease rapidly as they stretch.

Figure 61. Belt deflection

1. To determine the appropriate belt deflection:

a. Measure the center-to-center distance, in inches,

between the fan sheave and the motor sheave.

b. Divide the distance measured in Step 1a by 64; the

resulting value represents the amount of belt deflection for the proper belt tension.

2. Set the large O-ring on the belt tension gauge at the deflection value determined in Step 1b.

3. Set the small O-ring at zero on the force scale of the gauge.

4. Place the large end of the gauge on the belt at the center of the belt span. Depress the gauge plunger until the large O-ring is even with the of the second belt or even with a straightedge placed across the sheaves.

5. Remove the tension gauge from the belt. Notice that the small O-ring now indicates a value other than zero on the force scale. This value represents the force (in pounds) required to deflect the belt(s) the proper distance when properly adjusted.

6. Compare the force scale reading in step 5 with the appropriate “force” value in force reading is outside of the listed range for the type of belts used, either readjust the belt tension or contact a qualified service representative.

Figure 61, p. 96. If the

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Table 72. Deflection force

Deflection Force (Lbs.)

358

Belts

Cross

Section

Small P.D

Range

3.0 -3.6 3 4 1/2 3 7/8 5 1/2 3 1/4 4 — — — —

3.8 - 4.8 3 1/2 5 4 1/2 6 1/4 3 3/4 4 3/4 — — — —

5.0 - 7.0 4 5 1/2 5 6 7/8 4 1/4 5 1/4 — — — —

3.4 - 4.2 4 5 1/2 5 3/4 8 4 1/2 5 1/2 — — — —

4.4 - 5.6 5 1/8 7 1/8 6 1/2 9 1/8 5 3/4 7 1/4 — — — —

5.8 - 8.8 6 3/8 8 3/4 7 3/8 10 1/8 7 8 3/4 — — — —

4.4 - 8.7 — — — — — — — — 10 15

7.1 - 10.9 — — — — — — 10 1/2 15 3/4 12 7/8 18 3/4

11.8 - 16.0 — — — — — — 13 19 1/2 15 22

Super Gripbelts Gripnotch

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.

Gripbelts 358 Gripbelts

Steel Cable

Gripnotch

Belts

Table 73. Supply fan sheave and belt

Fan Sheave

(a)(b)(c)

Fan Bushing

Tons Motor RPM

550 BK190 X 1 7/16 BK190-1-7/16 BK62H BK62H H 1-3/8 H-1-3/8

27.5 & 30

7.5 hp

27.5 & 30

10 hp

7.5 hp 600 BK160 X 1 7/16 BK160-1-7/16 BK57H BK57H H 1-3/8 H-1-3/8

10 hp

15 hp

10 hp

15 hp

600 BK160 X 1 7/16 BK160-1-7/16 BK57H BK57H H 1-3/8 H-1-3/8

650 BK160 X 1 7/16 BK160-1-7/16 BK62H BK62H H 1-3/8 H-1-3/8

650 BK190 X 1 7/16 BK190-1-7/16 BK75H BK75H H 1-3/8 H-1-3/8

700 BK160 X 1 7/16 BK160-1-7/16 BK67H BK67H H 1-3/8 H-1-3/8

(f)

750 BK160 X 1 7/16 BK160-1-7/16 BK72H BK72H H 1-3/8 H-1-3/8

650 BK190 X 1 7/16 BK190-1-7/16 BK75H BK75H H 1-3/8 H-1-3/8

700 BK160 X 1 7/16 BK160-1-7/16 BK67H BK67H H 1-3/8 H-1-3/8

790 BK160 X 1 7/16 BK160-1-7/16 1B5V68 1B68SDS B 1 5/8 SDS 1 5/8

(g)

800 BK160 X 1 7/16 BK160-1-7/16 1B5V70 1B70SDS B 1 5/8 SDS 1 5/8

500 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2BK36H 2BK36H H 1-3/8 H-1-3/8

525 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2BK40H 2BK40H H 1-3/8 H-1-3/8

575 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2BK45H 2BK45H H 1-3/8 H-1-3/8

625 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2B5V42 2B42SH P1 1-5/8 SH 1 5/8

675 2B5V136 2B136SK B 1 11/16 SK 1 11/16 2B5V50 2B50SDS B 1 5/8 SDS 1 5/8

725 2B5V136 2B136SK B 1 11/16 SK 1 11/16 2B5V54 2B54SDS B 1 5/8 SDS 1 5/8

(c)

Motor Sheave

(c)(d)

Motor Bushing

Maintenance

(c)(e)

BeltBrowning SST Browning SST Browning SST Browning SST

BX108  Notched

BX100  Notched

BX103 Notched

BX108  Notched

BX103  Notched

BX100  Notched

BX108  Notched

BX103  Notched

BX95  Notched

BX97  Notched

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Maintenance

Table 73. Supply fan sheave and belt

Fan Sheave

Tons Motor RPM

525 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2BK40H 2BK40H H 1-3/8 H-1-3/8

10 hp

15 hp

20 hp 725 2B5V136 2B136SK B 1 11/16 SK 1 11/16 2B5V54 2B54SDS B 1 5/8 SDS 1 5/8

(a) Browning BK160 X 1 7/16 and SST BK160-1-7/16 sheaves are interchangeable. (b) Browning BK190 X 1 7/16 and SST BK190-1-7/16 sheaves are interchangeable. (c) All other sheaves & bushings are interchangeable only in sheave/bushing combination sets. Sets do not mix vendors. (d) Browning and SST sheaves with identical numbers are interchangeable and can be used with each other's bushings. (e) Browning H 1-3/8 and SST H-1-3/8 bushings are interchangeable and can be used with each other's sheaves. (f) For YC gas/electric only. (g) For TC and TE Cooling only and with electric heat units only.

575 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2BK45H 2BK45H H 1-3/8 H-1-3/8

625 2B5V124 2B124SK B 1 11/16 SK 1 11/16 2B5V42 2B42SH P1 1-5/8 SH 1 5/8

675 2B5V136 2B136SK B 1 11/16 SK 1 11/16 2B5V50 2B50SDS B 1 5/8 SDS 1 5/8

(a)(b)(c)

Fan Bushing

(c)

Motor Sheave

(c)(d)

Motor Bushing

(c)(e)

BeltBrowning SST Browning SST Browning SST Browning SST

BX95  Notched

BX95 Notched

BX97  Notched

Monthly Maintenance

WARNING

Hazardous Voltage!

Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.

Filters

Inspect the return air filters. Clean or replace them if necessary. Refer to the table below for filter information.

Ta b le 74 . F il t e r s

Unit Model Quantity

TC, TE, YC*330 - 420 16 15½ X 19½ X 2 or 4*

TC, TE, YC*480 & 600 17 15½ X 19½ X 2 or 4*

* Filter dimensions are actual. Nominal filter size is 16 x 20.

Cooling Season

• Check the unit’s drain pans and condensate piping to ensure that there are no blockages.

• Inspect the evaporator and condenser coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in “Coil Cleaning” later in this section.

• Inspect the F/A-R/A damper hinges and pins to ensure that all moving parts are securely mounted. Keep the blades clean as necessary.

Filter Dimension

(inches)

• Manually rotate the condenser fans to ensure free movement and check motor bearings for wear. Verify that all of the fan mounting hardware is tight.

• Verify that all damper linkages move freely; lubricate with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Check the fan shaft bearings for wear. Replace the bearings as necessary. These bearing are considered permanently lubricated for normal operation. For severe dirty applications, if relubrication becomes necessary, use a lithium based grease. See

Ta bl e 75,

p. 99 for recommended greases.

Important: The bearings are manufactured using a

special synthetic lithium based grease designed for long life and minimum relube intervals. Over lubrication can be just as harmful as not enough.

Use a hand grease gun to lubricate these bearings; add grease until a light bead appears all around the seal. Do not over lubricate!

After greasing the bearings, check the setscrews to ensure that the shaft is held securely. Make sure that all bearing braces are tight.

• Check the supply fan belt(s). If the belts are frayed or worn, replace them.

• Check the condition of the gasket around the control panel doors. These gaskets must fit correctly and be in good condition to prevent water leakage.

• Verify that all terminal connections are tight.

• Remove any corrosion present on the exterior surfaces of the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping connections, etc.)

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Maintenance

Make sure that all retaining screws are reinstalled in the unit access panels once these checks are complete.

With the unit running, check and record the:

• ambient temperature;

• compressor oil level (each circuit);

• compressor suction and discharge pressures (each

circuit);

• superheat and subcooling (each circuit);

Record this data on an “operator’s maintenance log” like the one shown in Table 77, p. 103. If operating pressures indicate a refrigerant shortage, measure the system superheat and system subcooling. For guidelines, refer to “Charging by Subcooling”.

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. Refer to general service bulletin MSCU-SB-1 (latest edition).

Heating Season

WARNING

Hazardous Voltage!

Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.

• Inspect the unit air filters. If necessary, clean or replace them.

• Check supply fan motor bearings; repair or replace the motor as necessary.

p. 99 for recommended greases.

Note: The bearings are manufactured using a special

synthetic lithium based grease designed for long life and minimum relube intervals. Too much lubrication in a bearing can be just as harmful as not enough.

Use a hand grease gun to lubricate the bearings; add grease until a light bead appears all around the seal. Do not over lubricate!

After greasing the bearings, check the setscrews to ensure that the shaft is held securely. Make sure that all bearing braces are tight.

Ta bl e 75,

• Inspect both the main unit control panel and heat section control box for loose electrical components and terminal connections, as well as damaged wire insulation. Make any necessary repairs.

• YC* units only - Check the heat exchanger(s) for any corrosion, cracks, or holes.

• Check the combustion air blower for dirt. Clean as necessary.

WARNI NG

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 installation, adjustment, alteration, service or use of this product could cause flammable mixtures. 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.

WARNI NG

Hazardous Pressures!

When using dry nitrogen cylinders for pressurizing units for leak testing, always provide a pressure regulator on the cylinder to prevent excessively high unit pressures. Never pressurize unit above the maximum recommended unit test pressure as specified in applicable unit literature. Failure to properly regulate pressure could result in a violent explosion, which could result in death or serious injury or equipment or property-only-damage.

• Open the main gas valve and apply power to the unit heating section; then initiate a “Heat” test using the startup procedure described in “Verifying Proper Heater Operation”.

• Verify that the ignition system operates properly.

Note: Typically, it is not necessary to clean the gas

furnace. However, if cleaning does become necessary, remove the burner plate from the front of the heat exchanger to access the drum. Be sure to replace the existing gaskets with new ones before reinstalling the burner.

Table 75. Grease recommendations

Recommended Grease

Exxon Unirex #2

Mobil 532 -20 F to 250 F

Mobil SHC #220

Texaco Premium RB

Recommended Operating Range

RT-SVX34F-EN 99

Page 100

Maintenance

Coil Cleaning

Regular coil maintenance, including annual cleaning enhances the unit’s operating efficiency by minimizing:

• Compressor head pressure and amperage draw;

• Water carryover;

• Fan brake horsepower; and,

• Static pressure losses.

At least once each year—or more often if the unit is located in a “dirty” environment—clean the evaporator, microchannel condenser, and reheat coils using the instructions outlined below. Be sure to follow these instructions as closely as possible to avoid damaging the coils.

To clean refrigerant coils, use a soft brush and a sprayer.

Important: DO NOT use any detergents with

microchannel condenser coils. Pressurized water or air ONLY.

For evaporator and reheat coil cleaners, contact the local Trane Parts Center for appropriate detergents.

1. Remove enough panels from the unit to gain safe access to coils.

a. For the 50 ton unit with the 3rd coil closest to the

bulk-head, safe access can be gained by removal of the unit side panels.

b. For the 40 ton and 50 ton units, access to the 2-row

microchannel condenser coils removal of the corner posts will be necessary.

WARN ING

No Step Surface!

Note: Bridging between the main supports required

before attempting to enter into the unit. Bridging may consist of multiple 2 by 12 boards or sheet metal grating.

2. Straighten any bent coil fins with a fin comb.

3. For accessible areas, remove loose dirt and debris from both sides of the coil. For dual row microchannel condenser coil applications, seek pressure coil wand extension through the local Trane Parts Center.

4. When cleaning evaporator and reheat coils, mix the detergent with water according to the manufacturer’s instructions. If desired, heat the solution to 150° F maximum to improve its cleansing capability.

Important: DO NOT use any detergents with

microchannel coils. Pressurized water or air ONLY.

5. Pour the cleaning solution into the sprayer. If a highpressure sprayer is used:

a. The minimum nozzle spray angle is 15 degrees.

b. Do not allow sprayer pressure to exceed 600 psi.

c. Spray the solution perpendicular (at 90 degrees) to

the coil face.

d. For evaporator and reheat coils, maintain a

minimum clearance of 6" between the sprayer nozzle and the coil. For microchannel condenser coils, optimum clearance between the sprayer nozzle and the microchannel coil is 1"-3”.

6. Spray the leaving-airflow side of the coil first; then spray the opposite side of the coil. For evaporator and reheat coils, allow the cleaning solution to stand on the coil for five minutes.

7. Rinse both sides of the coil with cool, clean water.

8. Inspect both sides of the coil; if it still appears to be dirty, repeat Steps 6 and 7.

9. Reinstall all of the components and panels removed in Step 1; then restore power to the unit.

10. For evaporator and reheat coils, use a fin comb to straighten any coil fins which were inadvertently bent during the cleaning process.

Microchannel Condenser Coil Repair and Replacement

If microchannel condenser coil repair or replacement is required, seek HVAC Knowledge Center information or General Service Bulletin RT-SVB83*-EN for further details.

Fall Restraint

WARNING

Falling Off Equipment!

This unit is built with fall restraint slots located on unit top that MUST be used during servicing. These slots are to be used with fall restraint equipment that will not allow an individual to reach the unit edge. However such equipment will NOT prevent falling to the ground, for they are NOT designed to withstand the force of a falling individual. Failure to use fall restraint slots and equipment could result in individual falling off the unit which could result in death or serious injury.

The fall restraint is located approximately 3 feet from the unit edge. See Figure 62, p. 101

100 RT-SVX34F-EN

Trane TCD330B, TCD360B, TCD420B, TCD480B, TCD600B Installation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

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