Trane TCD330B, TCD480B, TCD360B, TCD420B, TCD600B Installation & Operation Manual

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Page 1

Installation, Operation, Maintenance

Voyager™ Commercial

27.5 to 50 Ton 60 Hz

22.9 to 41.7 Ton 50 Hz CV or 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)

SAFETY WARNING

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.

November 2010 RT-SVX34C-EN

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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.

ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout

this literature. Read these carefully.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION: 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.

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

accidents.

Important Environmental Concerns!

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

Responsible Refrigerant Practices!

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

Literature Change History

RT-SVN34B-EN (April 2010)

Updated issue of manual: provides specific installation, operation and maintenance instructions for B and later design sequence on units with R-410A refrigerant.

RT-SVN34B-EN (January 2010)

Updated issue of manual: provides specific installation, operation and maintenance instructions for B and later design sequence on units with R-410A refrigerant.

RT-SVN34A-EN (March 2009)

Original issue of manual: provides specific installation, operation and maintenance instructions for A and later design sequence on units with R-410A refrigerant.

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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) and VAV (Variable Air Volume) applications. Refer to the table of contents for a listing specific topics. Refer to the "System Troubleshooting" section at the end of this manual for troubleshooting information.

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.

Warnings, Cautions and Notices

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

WARNING

Personal Protective Equipment (PPE) Required!

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

• Before installing/servicing this unit, technicians MUST put on all 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 necessary Personal Protective Equipment (PPE) in accordance with NFPA70E for arc/flash protection PRIOR to servicing the unit.

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

WARNIN G

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 codes could result in death or serious injury.

RT-SVX34C-EN 3

Page 4

Table of Contents

Literature Change History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Overview of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

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

Commonly Used Acronyms/Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

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

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

General Unit Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Gas Heat Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

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

First Aid Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Downflow Models Only: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

All Units: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Field Installed Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Unit Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Recommended Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Roof Curb and Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Horizontal Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Unit Rigging and Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Installation General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Condensate Drain Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

O/A Sensor & Tubing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Units with Statitrac™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installation Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Disconnect Switch External Handle (Factory Mounted Option) . . . . . . . . . . 29

Main Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Thru-the-Base Electrical (Optional Accessory) . . . . . . . . . . . . . . . . . . . . . 30

Electrical Wire Sizing and Protection Device Equations . . . . . . . . . . . . . . . . 35

Low Voltage Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Control Power Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Field Installed AC Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Field Installed DC Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Remote Panels and Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4 RT-SVX34C-EN

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Constant Volume Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Variable Air Volume Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Installation Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Connecting the Gas Supply Line to the Furnace Gas Train . . . . . . . . . . . 51

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Unit Control Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Microelectronic Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Variable Air Volume Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Constant Volume or Variable Air Volume Applications . . . . . . . . . . . . . . 63

Preparing the Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Electrical Phasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Voltage Supply and Voltage Imbalance . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Starting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Test Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Verifying Proper Fan Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Verifying Proper Air Flow (CFM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Exhaust Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Economizer Damper Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Economizer (O/A) Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Manual Fresh Air Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Starting the Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Starting 27.5 to 35 Ton Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Starting 40 to 50 Ton Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

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

Scroll Compressor Operational Noises . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Compressor Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Charging by Subcooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Measuring Subcooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Gas Heat Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Electric Heat Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Final Unit Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

For Constant Volume Units; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

For Variable Air Volume Units; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Mechanical Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 112

Dehumidification (Modulating Hot Gas Reheat) Sequence of Operation . 112

RT-SVX34C-EN 5

Units without an Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Economizer operation based on Dry Bulb . . . . . . . . . . . . . . . . . . . . . . . . 113

Economizer operation based on Reference Enthalpy . . . . . . . . . . . . . . 114

Economizer Operation based on Comparative Enthalpy . . . . . . . . . . . . 114

Page 6

Gas Heat Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Electric Heat Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Low Pressure Control (LPC) Sequence of Operation (ReliaTel Control) . . 117

High Pressure Control and Temperature Discharge Limit (ReliaTel Control)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Fan Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Monthly Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Cooling Season . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Heating Season . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Fall Restraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Refrigerant Evacuation and Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Compressor Replacements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Electrical Phasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Precision Suction Restrictor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

System Status/Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Terminal locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Diagnostics (CV units only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Diagnostics (VAV only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Resetting Cooling and Ignition Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . 131

Zone Temperature Sensor (ZSM) Service Indicator . . . . . . . . . . . . . . . . 132

RTRM Zone Sensor Module (ZSM) Test . . . . . . . . . . . . . . . . . . . . . . . . . 132

Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Test 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Test 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Test 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Programmable & Digital Zone Sensor Test . . . . . . . . . . . . . . . . . . . . . . 134

ReliaTel Refrigeration Module (RTRM) . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Test 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

ReliaTel Air Module (RTAM) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Test 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Test 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Test 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Test 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Compressor—Blink Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

6 RT-SVX34C-EN

Page 7

TR-1 and TR-200 VFD Programming Parameters . . . . . . . . . . . . . . . . . . 146

Unit Wiring Diagram Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Warranty and Liability Clause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

COMMERCIAL EQUIPMENT RATED 20 TONS AND LARGER AND RELATED ACCESSORIES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

RT-SVX34C-EN 7

Page 8

Model Number Descriptions

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 Configuration H = Horizontal Configuration

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 Supply1

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

Digit 9 — Heating Capacity4

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

Heat Exchanger (YC only)

K = High Heat-Stainless Steel Gas

Heat Exchangers (YC only)

M = Low Heat-Stainless Steel Gas

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

P = High Heat-Stainless Steel Gas

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

R = Low Heat-Stainless Steel Gas

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

T = High Heat-Stainless Steel Gas

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

Note: When second digit is “E” for

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

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

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” Std Eff, Throwaway Filters B = 2” MERV 8, High Eff, Throwaway

C = 4” MERV 8, High Eff, Throwaway

D = 4” MERV 14, High Eff, Throwaway

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

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

FreshAir Damper

Fresh Air Damper

Digit 16 — System Control

1 = Constant Volume 2 = VAV Supply Air Temperature

3 = VAV Supply Air Temperature

4 = VAV Supply Air Temperature

Control w/o Inlet Guide Vanes

Control w/Inlet Guide Vanes

Control w/Variable Frequency

5 = VAV Supply Air Temperature

Note: Zone sensors are not included

Drive w/o Bypass

Control w/Variable Frequency Drive and Bypass

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

N = Standard Efficiency

Condenser Coil

Condenser Coil with Black Epoxy Pre-Coating

Digit 30-31 — Miscellaneous Options

8 RT-SVX34C-EN

Page 9

Model Number Descriptions

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 Tabl e 19,

p. 47 for additional information):

Electric

Heater

Rated

Tons

VoltageKW27/36 41/54 72 90 108

208 x x

27½

to 35

240 x x

480 x x x x

600 x x x

208 x

240 x

and

480 x x x x

600 x x x x

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.

RT-SVX34C-EN 9

Page 10

Model Number Descriptions

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 Configuration H = Horizontal Configuration

Digits 4, 5, 6 – Nominal Cooling

D = 4” (102 MM) MERV 14, High Eff,

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

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 Supply1

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

Digit 9 – Heating Capacity4

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) Std Eff, Throwaway

Filters

B = 2” (51 MM) MERV 8, High Eff,

Throwaway Filters

C = 4” (102 MM) MERV 8, High Eff,

10 RT-SVX34C-EN

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

Digit 16 – System Control

1 = Constant Volume 2 = VAV Supply Air Temperature

3 = VAV Supply Air Temperature

Note: Zone sensors are not included

Miscellaneous Options

Digit 17

A = Service Valves

Digit 18

B = Through the Base Electrical

Digit 19

C = Non-Fused Disconnect Switch

Digit 20

D = Factory-Powered 15A GFI

Digit 21

E=Field-Powered 15A GFI

Digit 22

Throwaway Filters

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

Control

Reference Enthalpy Control

Differential Enthalpy Control

Fresh Air Damper

Control w/o Inlet Guide Vanes

Control w/Inlet Guide Vanes

with option and must be ordered as a separate accessory.

Provision

with External Handle

Convenience Outlet and Non-Fused Disconnect Switch with External Handle

Convenience Outlet

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

N = Standard Efficiency

Condenser Coil with Black Epoxy Pre-Coating

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 thru 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.

Page 11

General Information

Commonly Used Acronyms/Abbreviations

BAS = Building Automation System

CFM = Cubic Feet per Minute

CLV = Cooling Valve (Reheat only)

COMM = Module Designation for TCI/LCI

CV = Constant Volume

CW = Clockwise

CCW = Counterclockwise

DSP = Direct Space Pressure control

DTS = Discharge Air Sensor

DWU = Daytime Warm-up

E/A = Exhaust Air

ECA = Economizer Actuator

EET = Entering Evaporator Temperature Sensor

F/A = Fresh Air

FFS = Fan Failure Swi tc h

ICS = Integrated Comfort System (See BAS)

IDM = Indoor Fan Motor

IGV = Inlet Guide Vanes

I/O = Input/Output

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

LCI = LonTalk® Communication Interface

LCI-R = LonTalk Communication Interface with ReliaTel

LH = Left Hand

MAS = Mixed Air Sensor

MAT = Mixed Air Temperature

MWU = Morning Warm Up

NSB = Night Setback (programmable ZSM BAYSENS119*)

O/A = Outside Air

OAH = Outside Air Humidity

OAT = Outside Air Temperature

PGA = Power Exhaust Actuator

PSIG = Pounds Per Square Inch Gauge pressure

PHM = Phase monitor

R/A = Return Air

RAH = Return Air Humidity

RAT = Return Air Temperature sensor

RH = Right Hand

RHP = Reheat Pumpout Solenoid

RHV = Reheat Valve

RLP = Reheat Low Pressure Cutout

RPM = Revolutions Per Minute

RTAM = ReliaTel Airhandler Mo dule

RTDM = ReliaTel Dehumidification Module

RTVM = ReliaTel Ventilation Module

RT-SVX34C-EN 11

Page 12

General Information

RTOM = ReliaTel Options Module

RTRM = ReliaTel Refrigeration Module

S/A = Supply Air

SPC = Space Pressure Calibration Solenoid

SPP = Space Pressure Transducer

SPT = Static Pressure Transducer

TCI = Trane Communication Interface

TCO = Temperature Cutout

TDL = Temperature Discharge Limit

VAV = Variable Air Volume

VFD = Variable Frequency Drive

VHR = Ventilation Heat Relay (VAV box relay)

W.C. = Wa t e r Colu m n

XFSP = Exhaust Fan Setpoint

ZSM = Sensor, Zone Sensor, Zone Sensor Module, Zone Panel

About the Unit

Overall unit dimensional data is illustrated in Figure 1, p. 17 to Figure 9, p. 22. 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" (see acronyms/abbreviations previous page).

Basic unit components include:

• Scroll compressors

• One (1) Intertwined Evaporator Coil

• One (1) Intertwined Condenser Coil

• One (1) Supply Fan

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

• Filters (type is dependent on option selection)

Precautionary Measures

WARNIN G

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. Glass wool fibers may also cause respiratory, skin or eye irritation.

- 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.

12 RT-SVX34C-EN

Page 13

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

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

• Check for material shortages. Figure 11 on page 23 illustrates where "ship with" items are

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

General Information

electrical data).

damage.

placed inside the unit.

and before it is stored. Do not walk on the sheet metal base pans.

Storage

WARNIN G

No Step Surface!

Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the supporting metal to collapse. Failure of the drain pan 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.

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 "Unit startup".

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

RT-SVX34C-EN 13

Page 14

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 Models Only:

• 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" section).

• Rigging the unit. Refer to Figure 12, p. 24.

• Placing the unit on curb; check for levelness. See “Roof Curb and Ductwork” on page 16.

• 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. 29.

• Service Valve Option; See “Starting the Compressor” on page 98.

• Return/Fresh-air damper adjustment. Refer to “Economizer Damper Adjustment” on page 94.

• Exhaust Fan Damper Stop Adjustment. Refer to Exhaust Damper Adjustment figures, beginning with Figure 46, p. 103.

Electrical Requirements

(See Figure 18, “Typical Field Power Wiring,” on page 34.)

• 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 unit-mounted disconnect switch.

WARNIN G

Proper Field Wiring and Grounding Required!

• Properly ground the unit.

14 RT-SVX34C-EN

Page 15

Field Installed Control Wiring

(Figure 19, p. 41 and Figure 20, p. 42.)

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

“Low Voltage Wiring” on page 39 for guidelines.

the

• Complete the field wiring connections for the variable air volume controls as applicable. Refer to the “Low Voltage Wiring” on page 39 for guidelines.

Gas Heat Requirements

(See “Installation Piping” on page 53.)

• 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.

Pre-Installation

RT-SVX34C-EN 15

Page 16

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. 23 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.

If a Trane curb accessory kit is not used:

Horizontal Ductwork

When attaching the ductwork to a horizontal unit, provide a water tight flexible connector at the unit to prevent noise transmission from the unit into the ductwork. Refer to figures beginning on page

17 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.

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, S/A opening, and R/A openings.

c. Insulation must be installed on the bottom of the condenser section of the unit.

16 RT-SVX34C-EN

Page 17

Unit Dimensions and Weights

1 1/4 (32)

3 1/4 (81)

Figure 1. 60 Hz 27½-35, 50 Hz 23-29 Tons (TC, TE, YC Low Heat)

Figure 2. Rear view showing duct openings for horizontal units

RT-SVX34C-EN 17

Page 18

Unit Dimensions and Weights

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

191

Figure 3. 60 Hz 27½-35, 50 Hz 23-29 Tons (TC, TE, YC Low Heat)

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

Figure 4. 60 Hz 27½-35, 50 Hz 23-29 Tons (YC High Heat)

18 RT-SVX34C-EN

Page 19

Unit Dimensions and Weights

Figure 5. Duct openings, 60 Hz 27½-35, 50 Hz 23-29 Tons (YC High Heat)

3 1/4 (81)

1 1/4 (32)

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

90 5/8"

2301.8mm

208 1/16"

5284.7mm

SEE NOTE 2

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.

3.25 [82.55mm] TO TOP OF FAN GRILLE

1 1/4" [31.7mm]

PVC PIPE FEMALE

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

RT-SVX34C-EN 19

42"

1066.8mm

2128.8mm

1" [25.4MM] NPT GAS INLET

83 13/16"

5 3/8"

136.5m

7 9/16"

192.1m

207 1/2"

5270.5mm

CUSTOMER CONNECTION POINT

40 3/16"

1020.7mm

6 15/16"

174.6mm

90 1/16"

2287.5mm

70 7/16"

1789.1mm

Page 20

Unit Dimensions and Weights

1 1/4 (32)

3 1/4 (81)

Figure 7. 60 Hz 40-50, 50 Hz 33-42 Tons (TC, TE, YC Low and High Heat)

Figure 8. Duct openings, 60 Hz 40-50, 50 Hz 33-42 Tons

(TC, TE, YC Low and High Heat)

20 RT-SVX34C-EN

Page 21

Unit Dimensions and Weights

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 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.

Figure 10. Fresh Air and Power Exhaust Dimensions for TC*, TE*, and YC* Units

RT-SVX34C-EN 21

Page 22

Unit Dimensions and Weights

Figure 11. Location of "Ship With" Items for TC*, TE*, and YC* Units

Unit Rigging and Placement

WARNIN G

Heavy Objects!

Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) 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 may cause equipment or property-only damage. Failure to properly lift unit may 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. 23.

22 RT-SVX34C-EN

Page 23

Unit Dimensions and Weights

Figure 12. Unit Rigging

Table 1. Minimum Operating Clearances Installation (Horizontal and Downflow Configurations)

Recommended Clearances

Single Unit

TC*, TE*, YC*

27.5 to 50 Tons

Exhaust End

6 Feet 8 Feet 4 Feet

Distance Between Units

Economizer/

Multiple Unit

TC*, TE*, YC*

27.5 to 50 Tons

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

Exhaust End End/Side Service Side Access

12 Feet 16 Feet 8 Feet

Condenser Coil

Orientation End/Side

(a)

Service Side Access

Table 2. Maximum Slope

Cabinet End to End (inches) Side to Side (inches)

"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.

RT-SVX34C-EN 23

Page 24

Unit Dimensions and Weights

Z (see note 2)

Figure 13. Center of Gravity

Table 3. Center of Gravity

Center-of-Gravity (inches)

Unit Model

YC Low Heat

Dimension

YC High Heat

Dimension TC/TE Dimension

X Y Z X Y Z X Y Z

***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, inlet guide vanes, 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

Table 4. Approximate Units Operating Weights — lbs./kg1

Basic Unit Weights1

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.

Low Heat

High Heat TC TE

24 RT-SVX34C-EN

Page 25

Unit Dimensions and Weights

DE F

TOP VIEW OF UNIT

COMPRS

CBA

Table 5. Point Loading Average Weight1,2 — 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 55/25 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 55/25 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 55/25 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 55/25 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 55/25 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 55/25 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 70/32 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**H480/400 145/65 200/90 50/23 300/135 70/32 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**D600/500 110/50 165/74 50/23 290/131 70/32 115/52 150/68 18/8 6/3 30/14 85/38 365/169 365/169

**H600/500 145/65 200/90 50/23 300/135 70/32 115/52 150/68 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.

RT-SVX34C-EN 25

Inlet Guide Vanes

Var. Freq.

Drives (VFD’s)

Bypass Lo Hi

Valves

Serv

Thru-

the base Elec.

Non-

Fused

Discon.

Switch

Factory.

GFI with

Discon.

Switch

Roof CurbW/O With

Page 26

Installation General Requirements

Condensate Drain Connection

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

Refer to Figure 11, p. 23 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. 26.

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

O/A Sensor & Tubing Installation

An Outside Air Pressure Sensor is shipped with all units designed to operate on variable air volume applications 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. 27 and the following steps to install the sensor and the pneumatic tubing.

1. Remove the O/A pressure sensor kit located inside the fan section. The kit contains the following items;

• an O/A static pressure sensor

• a sensor mounting bracket

• 50’ of 3/16" O.D. pneumatic tubing

• mounting hardware

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

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

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

26 RT-SVX34C-EN

Page 27

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. 28. 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

Installation General Requirements

RT-SVX34C-EN 27

Page 28

Installation General Requirements

Figure 16. Statitrac Transducer Assembly

Static Reference

ubing Connects

Here (O/A Sensor)

Space Pressure Sensing Tube Connects Here

Space Pressure Transducer

Space Pressure Calibration Solenoid

Space Pressure Transducer

Sensing Tube

to Space Pressure

CNO

Sensing Tube to Outside Air Reference

28 RT-SVX34C-EN

Page 29

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.

WARNIN G

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. 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 may result in equipment damage.

RT-SVX34C-EN 29

Page 30

Installation Electrical

Main Power Wiring

WARNIN G

Proper Field Wiring and Grounding Required!

1. Table 7, p. 32 and Table 9, p. 34 list the electrical 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 35 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 “Electrical Wire Sizing and

Protection Device Equations” on page 35 for determining correct size.

Location for the electrical service entrance is shown in the unit dimensional drawings beginning with Figure 1, p. 17. Complete the unit's power wiring connections onto either the main terminal block HTB1, or the factory mounted nonfused disconnect switch inside the unit control panel.

Note: When the factory installed through-the-base option is not used, the installing contractor is

required to seal any 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.

Thru-the-Base Electrical (Optional Accessory)

Liquid-tite conduit couplings are secured to the base of the unit for both power and control wiring. Liquid-tite 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.

30 RT-SVX34C-EN

Page 31

Figure 18. Typical Field Power Wiring

Installation Electrical

RT-SVX34C-EN 31

Page 32

Installation Electrical

Table 7. 27½-50 Ton Electrical Service Sizing Data—60Hz1

Compressor Supply Condenser Exhaust

1/12,1/

1/13,1/

RLA

(Ea.)

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

50.5/76.0 315/485

23.0/34.0 158/215

19.0/27.3 136/175

LRA

(Ea.) HP FLA No HP

Model

TC/TE/

YC*330

TC/TE/

YC*360

TC/TE/

YC*420

TC/TE/

YC*480

Electrical

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

Voltage

Range

No/Ton

Allowable

Fan Motors

FLA

(Ea.) 50%

100%

FLA

(Ea.)

No.

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

7.5

10.0

15.0

7.5

10.0

15.0

7.5

10.0

15.0

7.5

10.0

15.0

10.0

15.0

10.0

15.0

10.0

15.0

10.0

15.0

21.5

29.0

18.8

25.2

9.4

12.6

7.5

10.1

21.5

29.0

18.8

25.2

9.4

12.6

7.5

10.1

21.5

29.0

40.7

18.8

25.2

37.8

9.4

12.6

18.9

7.5

10.1

15.1

29.0

40.7

25.2

37.8

12.6

18.9

10.1

15.1

3 1.1 7.0 1 2 1.0 4.1

3 1.1 3.5 1 2 1.0 1.8

3 1.1 2.8 1 2 1.0 1.4

3 1.1 7.0 1 2 1.0 4.1

3 1.1 3.5 1 2 1.0 1.8

3 1.1 2.8 1 2 1.0 1.4

3 1.1 7.0 1 2 1.0 4.1

3 1.1 3.5 1 2 1.0 1.8

3 1.1 2.8 1 2 1.0 1.4

4 1.1 7.0 1 2 1.5 5.4

4 1.1 3.5 1 2 1.5 2.7

4 1.1 2.8 1 2 1.5 2.2

32 RT-SVX34C-EN

Page 33

Installation Electrical

Table 7. 27½-50 Ton Electrical Service Sizing Data—60Hz1

Fan Motors

Model

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

Electrical

Voltage

Range

No/Ton

Allowable

Compressor Supply Condenser Exhaust

2/13,1/

RLA

(Ea.)

50.5/56.0 315/351

23.0/27.5 158/197

19.0/23.0 136/146

LRA

(Ea.) HP FLA No HP

10.0

15.0

20.0

10.0

15.0

20.0

10.0

15.0

20.0

10.0

15.0

20.0

29.0

40.7

56.1

25.2

37.8

49.4

12.6

18.9

24.7

10.1

15.1

19.6

Table 8. Electrical Service Sizing Data — Crankcase Heaters — (Heating Mode Only)—60Hz

Nominal

Unit Size

(Tons)

27½ - 351111

40, 502211

200 230 460 575

FLA Add

Unit Voltage

FLA

(Ea.) 50%

100%

FLA

(Ea.)

No.

4 1.1 7.0 1 2 1.5 5.4

4 1.1 3.5 1 2 1.5 2.7

4 1.1 2.8 1 2 1.5 2.2

RT-SVX34C-EN 33

Page 34

Installation Electrical

Table 9. Electrical Service Sizing Data—50Hz

Fan Motors

Compressor

Electrical

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

No/Ton

Characteristic

RLA

(Ea.)

LRA

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

Supply Condenser

10 (6.8)

15 (10.5)

20 (12.8)

13.6/

14.1

16.0/

15.5

13.6/

14.1

16.0/

15.5

13.6/

14.1

16.0/

15.5

24.0/

26.0

16.0/

15.5

24.0/

26.0

16.0/

15.5

24.0/

26.0

29.0/

28.0

3 .75 (.56) 4.4 1 2

4 .75 (.56) 4.4 1 2

FLA

(Ea.)

50%

Exhaust

100%

(kW)

.75

(.56)

.75

(.56)

.75

(.56)

1.0

(.75)

1.0

(.75)

FLA

(Ea.)No.

1.7

2.5

Table 10. Electrical Service Sizing Data — Crankcase Heaters — (Heating Mode Only)—50Hz

Nominal

Unit Size

(Tons)

23 - 29 1 1

33 - 42 1 1

34 RT-SVX34C-EN

FLA Add

Unit Voltage

380 415

Page 35

Table 11. Electrical Service Sizing Data — Electric Heat Module (Electric Heat Only)

Models: TED/TEH 330—600 Electric Heat FLA

KW Heater

Nominal

Unit Size

(Tons)

27½-35

40- 50

Note:

1. All FLA in this table are based on heater operating at 208, 240, 480, and 600 volts.

Nominal

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

36 54 72 90 108

FLA FLA FLA FLA FLA

Electrical Wire Sizing and Protection Device Equations

Installation Electrical

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 Tab l e 11 , p . 3 5

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

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;

RT-SVX34C-EN 35

Page 36

Installation Electrical

1. Calculate the MCA, MOP and/or RDE values using the above equation as if the unit is operating

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

Note: When determining loads, the compressor s and condenser fan motors do not operate during

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 1)

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

Note: Select a Dual Element Fuse equal to the RDE value. If the calculated RDE value does not

in the cooling mode.

follows:

the heating cycle.

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.

equal a standard dual element fuse size listed in NEC 240-6, 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

Disconnect Switch Sizing (DSS)

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

Calculation B. - TE* Units:

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. 39. Figure 20, p. 40 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.

DSS = 1.15 X (LOAD1 + LOAD2 + LOAD4)

For TE* units, use calculations A and B.

DSS = 1.15 X (LOAD3 + Supply Fan FLA + Exhaust Fan FLA).

36 RT-SVX34C-EN

Page 37

Control Power Transformer

WARNIN G

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

WARNIN G

Proper Field Wiring and Grounding Required!

Installation Electrical

NOTICE:

Use Copper Conductors Only!

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

Before installing any connecting wiring, refer to Table 12, p. 37 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. 17 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 12. 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

RT-SVX34C-EN 37

Page 38

Installation Electrical

Field Installed DC Control Wiring

WARNIN G

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 may 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 13, p. 38 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. 17 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.

Table 13. 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.

• Must not pass between buildings.

38 RT-SVX34C-EN

Page 39

Figure 19. Typical Field Wiring Requirements for CV Control Options

LT B6

Space

Humidity

Sensor

Space

Humidistat

Installation Electrical

RT-SVX34C-EN 39

Page 40

Installation Electrical

Customer

Changeover

for VAV Htg (MOD GAS

ONLY

*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.

LT B6

Space

Humidity

Sensor

Space

Humidistat

Figure 20. Typical Field Wiring Requirements for VAV Control Options

40 RT-SVX34C-EN

Page 41

Figure 21. RTRM Zone Sensor/Thermostat Connections

ZSM INPUTS CV/VAV

(CV ONLY)

ZSM INPUTS

INPUTS

Remote Panels and Sensors

Installation Electrical

Constant Volume Control Options

The RTRM must have a zone sensor or conventional thermostat 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 on page 41 for conventional thermostat connections.

The following Constant Volume controls are available from the factory for field installation.

WARNIN G

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.

RT-SVX34C-EN 41

Page 42

Installation Electrical

SINGLE SETPOINT MANUAL CHANGE OVER

Figure 22. Zone Panel (BAYSENS106*)

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*.

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*.

42 RT-SVX34C-EN

Page 43

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

Heat mode/unoccupied mode relay output to VAV

Note:

Variable Air Volume 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 9 lists the operating sequence should a CV zone sensor be applied to a VAV system having selectable modes; i.e. Fan selection ON or AUTO. System selection HEAT, COOL, AUTO, and OFF.

Installation Electrical

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 J6-4 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 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

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Installation Electrical

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.

Table 14. 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

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".

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 Temp vs Resistance coefficient.

DWU Active DWU Off

will run continuously.

DWU

Off

DWU or Cooling VAV Cooling

1,2,3,4

DWU2 VAV Heating

VAV Cooling

DWU or Cooling VAV Cooling or Heating

1,2,3,4

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*.

The following Constant Volume or Variable Air Volume controls are available from the factory for field installation.

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

44 RT-SVX34C-EN

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Installation Electrical

The following Constant Volume or Variable Air Volume 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

Figure 27. Remote Zone Sensor (BAYSENS073*)

building management system.

Remote Zone Sensor (BAYSENS074*)

This electronic sensor features single setpoint capability and timed override with override cancellation. It is used with a Trane Integrated ComfortTM building management system.

Figure 28. Remote Zone Sensor (BAYSENS074*)

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 50 and 90 degrees Fahrenheit with a 2 degrees deadband. The Unoccupied cooling setpoint ranges between 45 and 98 degrees Fahrenheit. The unoccupied heating setpoint ranges between 43 and 96 degrees 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.

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Installation Electrical

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 15 on page 48 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.

Figure 29. Remote Sensor with Night Setback BAYSENS119

RTRM

Twisted/Shielded Run Shield to terminal 11

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*)

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Installation Electrical

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)

Space Temperature Averaging

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.

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Installation Electrical

Figure 32. 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.

Table 15. Temperature vs. Resistance (temperature vs. resistance coefficient is negative)

Degrees F°

-20° 170.1 K - Ohms

-15° 143.5 K - Ohms

-10° 121.4 K - Ohms

-5° 103.0 K - Ohms

0° 87.56 K - Ohms

5° 74.65 K - Ohms

10° 63.80 K - Ohms

15° 54.66 K - Ohms

20° 46.94 K - Ohms

25° 40.40 K - Ohms

30° 34.85 K - Ohms

35° 30.18 K - Ohms

40° 26.22 K - Ohms

45° 22.85 K - Ohms

48 RT-SVX34C-EN

Nominal

Resistance

Page 49

Installation Electrical

Table 15. Temperature vs. Resistance (temperature vs. resistance coefficient is negative)

Degrees F°

50° 19.96 K - Ohms

55° 17.47 K - Ohms

60° 15.33 K - Ohms

65° 13.49 K - Ohms

70° 11.89 K - Ohms

75° 10.50 K - Ohms

80° 9.297 K - Ohms

85° 8.247 K - Ohms

90° 7.330 K - Ohms

95° 6.528 K - Ohms

100° 5.824 K - Ohms

Nominal

Resistance

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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.

WARNIN G

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.

Access holes are provided on the unit as shown in Figure 11, p. 23 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 Tab l e 16 to determine the appropriate gas pipe size for the heating capacity listed on the unit's nameplate.

If a gas line already exists, verify th at it is siz ed la rge enough (Ta b l e 16 ) 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.

WARNIN G

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive conditions may occur. Use a leak test solution or other approved methods 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.

50 RT-SVX34C-EN

Page 51

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. 52 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 16. Sizing Natural Gas Pipe Mains and Branches

Gas Input (Cubic Feet/Hour)*

Gas Supply Pipe Run (ft)

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. 52 Cu.Ft/Hour = 500 Tab l e 1 6 indicates that a 1-1/4" pipe is required. *Table is based on a specific gravity of 0.60. Use Tab l e 1 7 , p. 5 2 or the specific gravity of the

local gas supply.

1-1/4"

Pipe

1-1/2"

Pipe 2" Pipe

2-1/2"

Pipe

Installation Piping

Pipe

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Installation Piping

Table 17. Specific Gravity Multiplier

Specific Gravity Multiplier

0.5 1.1

0.55 1.04

0.6 1

0.65 0.96

Figure 33. Gas Train Configuration for Low Heat Units (high heat units utilize two gas trains.)

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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 four 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.

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 "Cooling with an Economizer" 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 economizor damper position as long as the exhaust fan setpoint on the RTOM module has been exceeded. The actuator limits the maximum travel of the exhaust barometric damper.

RTAM - ReliaTel Airhandler Module (Standard with 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. 54.)

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Startup

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Figure 34. RTAM Module

Figure 35. RTOM Module

54 RT-SVX34C-EN

Page 55

Figure 36. RTVM Module

1 = S pa ce Pres s ure Dea d band (iwc) 2 = Space Pre s su re S e tpo i n t (iwc)

RTVM

1 = S pa ce Pres s ure Dea d band (iwc) 2 = Space Pre s su re S e tpo i n t (iwc)

RTVM

1 = S pa ce Pres s ure Dea d band (iwc) 2 = Space Pre s su re S e tpo i n t (iwc)

RTVM

1 = S pa ce Pres s ure Dea d band (iwc) 2 = Space Pre s su re S e tpo i n t (iwc)

RTVM

RTDM

Startup

Figure 37. RTDM Module

The RTAM module provides a 2 to 10 VDC output to control the IGV actuator or Variable Frequency Drive. DIP switches located on the RTAM configures the unit to use the output for IGV's or 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, 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. 54 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.

The RTVM (Ventillation 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

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Startup

atmospheric pressure. The Space Pressure Setpoint and Space Pressure Deadband are set by adjusting potentiometers located on the RTVM.

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 "OFF" for IGV's and "ON" for VFD's.

Switch 2 is "OFF" for VAV, "ON" for VAV without IGV.

Switch 3 and 4 operation are explained under "supply air temperature reset".

Switch 5 is "OFF" for DWU Disabled and "ON" for DWU Enabled.

Conventional Thermostat Connections (Standard 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. 41 for conventional thermostat connections. Applicable thermostats to be used with the conventional thermostat inputs are:

Table 18. 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.

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 Summitt 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 short-circuit 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.

56 RT-SVX34C-EN

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Startup

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.

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Startup

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 Units. When the fan mode switch on the Zone Sensor Module is set in the auto position, the RTRM provides individual supply fan timing sequences for each system in heating and cooling. The RTRM provides different timing sequences for Gas Heat units and Cooling only units.

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

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

6. Compressor cycle rate minimization, extends compressor life expectancy. Minimizes damaging compressor inrush current, and guards against short cycling.

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

On constant volume 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 allowed to operate.

8. 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 Unit w/Mechanical ZSM

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

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.

This input is ignored if a conventional thermostat is used.

VAV unit w/o ICS or NSB engerizes 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.

9. 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°

Cooling Setpoint = 70°

The control temperature for the economizer will be 1.5° above the heating setpoint due to it producing the least amount of offset.

Heating Setpoint = 55°

Cooling Setpoint = 75°

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:

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Startup

1. The zone temperature minus the economizer setpoint, and

2. The zone temperature minus the outdoor air temperature.

Note: Tab l e 19 lists the percentages the dampers will open based on these conditions.

Table 19. Percent of Damper Travel

Zone Temp - Econ Setpoint °F

Zone - ODT

0 - 7 F 0% 3% 9% 30% 90% 100%

7 - 14 F 0% 2% 6% 20% 60% 100%

> 14 F 0% 1% 3% 10% 30% 100%

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

The mechanical cooling is 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.

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

Modulating Power Exhaust

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

Mechanical Cooling without an Economizer (CV only)

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. Tabl e 20 lists the compressor stepping sequence.

Table 20. Compressor Staging with Lead/Lag Disabled

"ON" "OFF"

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

27.5 - 35 CPR 1

40 CPR 1

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".

CPR 1, 2 N/A N/A CPR 1, 2 CPR 1

CPR 2

CPR 2,3

CPR 1, 2 CPR 1, 2 CPR 2

CPR 1, 2, 3 CPR 1, 2, 3 CPR 2, 3

CPR 1

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Startup

Figure 39. Compressors

Zone Temperature - Occupied Cooling (CV only)

When the unit is in the cooling mode and the zone temperature raises above the cooling setpoint controlband, the economizer and the compressor stages will be cycled as required by the zone sensor, remote panel, or Tracer®.

Zone Temperature - Occupied Heating (CV only)

When the unit is in the heating mode and the zone temperature falls below the heating setpoint controlband, the necessary stages of heat will cycle to raise the temperature to within the setpoint controlband.

Supply Fan (CV only)

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. When the Fan Selection Switch is in the "ON" position, the supply fan will run continuously. If air flow 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 only)

This function allows the supply air temperature to be maintained within a low limit parameter during minimum ventilation periods. When the system is in the "Heating" mode of operation, the low limit parameter is equal to the heating setpoint minus 10 degrees F.

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. If the supply air temperature falls 10 degrees F below the heating setpoint, the next available stage of heat will be turned on. It will remain on until the supply air temperature reaches 10 degrees above the heating setpoint. A unit with modulating gas heat will activate heat at 10 degrees below the setpoint and modulate to maintain the heating setpoint.

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

Hot refrigerant gas 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 reheat valve 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" demands. Tempering will be discontinued whenever (a) the 5 minute "Supply Air Tempering Delay" timer has timed-out and (b) there is an active cooling request for VAV Occupied Cooling.

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Variable Air Volume Applications

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 +- 3.5F. 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.

Startup

VHR Relay Output

During unoccupied mode, daytime warm-up (DWU) and morning warm-up (MWU) the IGV's or VFD's 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 10o 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.

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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

-0.50.0 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

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 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 40. Output vs. Input

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Startup

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 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.

Constant Volume or Variable Air Volume Applications

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 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 stages of cooling will cycle 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.

Zone Temperature - Unoccupied Heating

While a building is in an unoccupied period as designated by a remote panel with night setback or ICS, the necessary stages of heat will cycle to maintain the zone temperature to within the unoccupied setpoint deadband. For VAV systems, the IGV's or VFD's 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.

Mechanical Cooling with an Economizer

The economizer is utilized to control the zone temperature providing 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.

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Startup

Table 21. Economizer Effectiveness

Method used to determine econmizer effectiveness Required

Comparative Enthalpy OAT, OAH, RAT, RAH

Reference Enthalpy OAT, OAH

Reference Dry Bulb OAT

Unable to determine effectiveness OAT data is invalid or unavailable

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 22 lists the selectable dry bulb values by potentiometer setting.

2. Reference Enthalpy - controlling the economizer cycle by sensing the outdoor air humidity.

Ta bl e 22 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 22. 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

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 capabilites 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, 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.

Electric Heat Control

The RTRM provides two heating outputs for 1st and 2nd stages with a 10 second delay between each stage. When the fan selection switch is in the "AUTO" mode, the fan will start approximately 1 second before the 1st heater stage is activated. The fan and heater will cycle off after the heating setpoint has been satisfied.

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

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Startup

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 Pressurize 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, the IGV to fully open, or the VFD to run at full speed, 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, the IGV to fully open, or the VFD to run at full speed, 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, the IGV to close, 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 23, p. 65 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 23. Ventilation Override Sequence

Mode and Priority

Affected Function Pressurize Purge Exhaust

123

Heat/Cool off off off

IGV/VFD open/full open/full open/full

speed speed speed

Supply Fan on on off

Exhaust Fan off on on

Economizer open open closed

VAV Boxes forced open forced open normal operation

(a) Exhaust mode 3 is not available with the tracking power exhaust option.

(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.

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Startup

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.

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.

High Pressure Cutout and Temperature Discharge Limit

The high pressure controls and temperature discharge limit are wired in series between the compressor outputs on the RTRM and the compressor contactors. On 27.5, 30, and 35 Ton units, if the high pressure safety switch or temperature discharge limit opens, the RTRM senses a lack of current while calling for cooling and locks both compressors out with an auto reset. On 40 and 50 Ton units, if the high pressure safety or temperature discharge limit opens, the compressor(s) on the affected circuit is locked out. If the compressor output circuit is opened four consecutive times during compressor operation, the RTRM will generate a manual reset lockout.

Power Exhaust Control (Standard)

The power exhaust fan is started whenever the position of the economizer dampers meets or exceed the power exhaust setpoint when the supply fan is on.

The setpoint potentiometer is on the RTOM and is factory set at 25%.

Space Pressure Control--Statitrac

A pressure transducer is used to measure and report direct space (building) static pressure. The user-defined control parameters used in this control scheme are Space Pressure Setpoint and Space Pressure Deadband. As the Economizer opens, the building pressure rises and enables the Exhaust Fan. The Exhaust dampers will be modulated to maintain Space Pressure within the Space Pressure Deadband.

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Figure 41. Transducer Voltage Output vs. Pressure Input for Supply, Return and

-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

Building Pressure

Startup

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 “(Downflow) Tracking Exhaust Damper Adjustment” on page 93. Refer to Power Exhaust Fan Performance" tables beginning with Table 42, p. 92

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.

Table 24. Capacity Steps with Lead/Lag Enabled

Unit Size Step 1 Step 2 Step 3

TC*330

RT-SVX34C-EN 67

TC*360

TC*420

TC*480

TC*600

LEAD 48% 100%

LAG 52% 100%

LEAD 50% 100%

LAG 50% 100%

LEAD 47% 100%

LAG 53% 100%

LEAD 40% 60%

LAG 60% 100%

LEAD 32% 68%

LAG 68% 100%

100%

Page 68

Startup

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 providing the 3 minute minimum "On" time for the compressor(s) has elapsed. 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 only in control during active dehumidification 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. For single circuit units one compressor will be staged off. The compressors which have been staged off will not be energized until the unit leaves the current dehumidification cycle or a dehumidification purge is initiated.

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 25, p. 68 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 42, p. 69 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 de-energized for approximately seven seconds to prevent problems with fan windmill.

Table 25. Condenser Fan/Compressor Sequence

Unit Size Compressor Staging Sequence Condenser Fan Output

(Tons) Step 1 Step2 Step 3 Output A Output B Fans "Off"

27.5 - 30

CPR 1*

CPR 1, 2

Fan #2

N/A

N/A Fan #2

Fan #2

Fan #3

O/A Temp. (°F)

-10

-20

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Startup

Table 25. Condenser Fan/Compressor Sequence

Unit Size Compressor Staging Sequence Condenser Fan Output

(Tons) Step 1 Step2 Step 3 Output A Output B Fans "Off"

Fan #2

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".

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 compressor is "On" ****First stage is “Off”, Number two refrigeration circuit, manifolded compressor pair is "On" operating simultaneously

CPR 1 **

CPR 1**

CPR 2***

CPR 2, 3****

CPR 1, 2

CPR 1, 2, 3

Fan #2 Fan #3, 4

Fan #3, 4

O/A Temp. (°F)

-30

-10

-30

Figure 42. Condenser Fan Location

Be sure to complete all of the procedures described in this section before starting the unit for the first time.

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Startup

Preparing the Unit for Operation

Use the checklist provided below in conjunction with the "Installation Checklist” to ensure that the unit is properly installed and ready for operation.

WARNIN G

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.

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:

• Open the disconnect switch or circuit protector switch that provides the supply power to the

WARNIN G

Hazardous Voltage!

• To be consistent with the compressor leads, connect the phase sequence indicator leads to the

Table 26. Phase Sequence Leads

unit's power terminal block or to the unit mounted disconnect switch.

terminal block or unit mounted disconnect switch as follows;

Phase Sequence Leads Unit Power Terminal

Red (phase A ) L1

Blue (phase B) L2

Black (Phase C) L3

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• Turn the "System" selection switch to the "Off" position and the "Fan" selection switch (if

AV VD–()

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

100×

Volt1 Volt2 Volt3++

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

221 230 227++

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

226Avg=

226 221–

226

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

100 2.2perc ent=×

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.

WARNIN G

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

Startup

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:

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Startup

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.

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 units is in the "Auto" position.

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

WARNIN G

Live Electrical Components!

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK HTB1 OR UNIT DISCONNECT SWITCH.

Upon power initialization, the RTRM performs self-diagnostic 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.

Test Modes

There are three methods in which the "Test" mode can be cycled at LTB1-Test 1 and LTB1-Test 2.

1. Step Test Mode - This method initiates the different components of the unit, one at a time, by temporarily shorting across the two test terminals for two to three seconds.

For the initial startup of either a Constant Volume or Variable Air Volume 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

72 RT-SVX34C-EN

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Startup

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 28, p. 74.

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 27. Service Test Switch

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Table 28. Test Mode States for VAV Units with Modulating Dehumidification

TEST STEP MODE IGV FAN ECON COMP 1 COMP 2 HEAT 1 HEAT 2 Pumpout

1 IGV TEST OPEN OPEN OFF CLOSED OFF OFF OFF OFF ON 100% 0%

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

5 COOL IN ON MIN ON OFF OFF OFF ON 100% 0%

6 COOL IN ON MIN OFF ON OFF OFF ON 100% 0%

7 COOL IN ON MIN ON ON OFF OFF ON 100% 0%

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

9 HEAT OPEN ON CLOSED OFF OFF ON OFF ON 100% 0%

10 HEAT OPEN ON CLOSED OFF OFF ON ON ON 100% 0%

11 RESET

IGV TEST

CLOSED

ECON TEST

OPEN

STAGE 1 CONTROL

STAGE 2 CONTROL ,

STAGE 3 CONTROL

STAGE 1

STAGE 2

CLOSED OFF CLOSED OFF OFF OFF OFF ON 100% 0%

CONTROL

IN ON OPEN OFF OFF OFF OFF ON 100% 0%

CONTROL

Cool

Valve

Reheat

Valve

Table 29. Test Mode States for CV Units with Modulating Dehumidification

TEST STEP MODE FAN ECON COMP 1 COMP 2 HEAT 1 HEAT 2 Pumpout Cool Valve

1 MIN VENT ON MIN OFF OFF OFF OFF ON 100% 0%

ECON TEST

3 COOL ON MIN ON1 OFF OFF OFF ON 100% 0%

4 COOL ON MIN OFF ON1 OFF OFF ON 100% 0%

5 COOL ON MIN ON1, 2 ON1, 2 OFF OFF ON 100% 0%

6 REHEAT ON MIN ON1 ON1 OFF OFF OFF 50% 50%

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

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

9RESET

OPEN

STAGE 1

STAGE 2

STAGE 3

STAGE 1

STAGE 2

ON OPEN3 OFF OFF OFF OFF ON 100% 0%

Reheat

Valve

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Verifying Proper Fan Rotation

Using the Service Test guide in Table 28, 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.

WARNIN G

Rotating Components!

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, IGV's will be controlled by discharge pressure (if applicable), 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.

Startup

WARNIN G

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 the "Electrical Phasing" section.

Verifying Proper Air Flow (CFM)

(CV, IGV's or VFD's)

1. All systems - Set the minimum position setting for the economizer to 0o degrees using the setpoint potentiometer located on the Economizer Actuator in the return section with the supply fan "On" and rotating in the proper direction:

CV applications - Measure the amperage at the supply fan contactor and compare it with the full load amp (FLA) rating stamped on the motor nameplate.

IGV's - With the O/A dampers fully closed, 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, IGV's will be under control of the Discharge Static Pressure setpoint

for the first six minutes of this test mode. Verify that the IGV's have been driven to the full open position or 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.

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Actual Motor Amps

Motor Nameplate Amps

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

Motor HP Theoretical BHP =r

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

Theoretical BHP Formula:

Where the two points intersect, read straight down to the CFM line. Use Table 38, p. 87 to select a new fan drive if the CFM is not within specifications.

Table 30. Supply Fan Performance—27½-35 Ton—60 Hz

Total Static Pressure (in. wg)1

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)1

2.50 2.75 3.00

RPMBHPRPMBHPRPMBHP

Figure 43, p. 78 and Figure 44, p. 78.

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Table 31. Supply Fan Performance—40 and 50 Ton—60 Hz

Total Static Pressure (in. wg)1

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)1

2.50 2.75 3.00 3.25 3.50

RPMBHPRPMBHPRPMBHPRPMBHPRPMBHP

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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

Supply Fan Performance 27-35T

0 H

7.5 H

Volumetric Air flow Rate(CFM)

Static Presure(InWC)

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000

20 HP

15 HP

7. 5 HP

Volumetric Airflow Rate(CFM)

Supply Fan Pe rformanc e 40 and 5 0 Ton

Static Pres ure(InWC)

Figure 43. Supply Fan Performance Curves 27.5 - 35 Ton—60Hz

Figure 44. Supply Fan Performance Curves 40 and 50 Ton—60Hz

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Table 32. 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

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

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).

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0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(0.0)

(125)

(249)

(374)

(498)

(623)

(747)

(872)

(996)

L/S in 1000' s

(0) (.94) (1.89) (2.83) (3.78) (4.72) (5.66) (6.61) (7.55) (8.5) (9.44) (10.38) (11.33) (12.27)

Supply Fan Performance

90%

0% W

OCFM

70%

WOCFM

15 HP

7.5 HP

5 HP

800 RPM

700 RPM

600 RPM

500 RPM

400

Volumetric Airflow Rate(CFM)

Stat ic Presur e(InWC)

Figure 45. Supply Fan Performance—22.9-29.2 Tons—50Hz

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Table 33. 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).

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Table 34. 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)

82 RT-SVX34C-EN

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Figure 46. Supply Fan Performance—33.3 and 41.7 Ton (IP)—50Hz

Supply Fan Performance 40 and 50 Ton

(1245)

Startup

800 RPM

(996)

(747)

(498)

Stat ic Pr esure( InWC)

(249)

(0.0)

750 RPM

700 RPM

650 RPM

600 RPM

550 RPM

500 RPM

450

400

350

RPM

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000

(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)

Volumetric Airflow Rate(CFM)

L/S in 1000' s

40%

7.5 H

WOCFM

50%

15 HP

60%

WOCFM

70%

80%

WOCFM

OCFM

WOCFM

RT-SVX34C-EN 83

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Startup

Table 35. 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).

84 RT-SVX34C-EN

Page 85

Startup

Table 36. TC*/YC* 300 - 600 MBH Economizer (R/A) Damper Pressure Drop

Unit

Capacity

27.5 8000 0.035 30 9000 0.042 35 10000 0.051

(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 50 15000 0.098

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 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)

Pressure

(b)

Drop

Unit

Capacity

Airflow

(Cfm)

(a)

— 60 Hz

Pressure

(b)

Drop

RT-SVX34C-EN 85

Page 86

Startup

Table 37. Component Static Pressure Drops (in. W.G.)1—60 Hz

Heating System

Throw-

Gas Heat Electric Heat3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

12000 0.01 0.03 0.08 0.13 0.24 0.36 0.1 0.19 0.17 0.34 0.04 0.09

13000 0.01 0.04 0.1 0.15 0.28 0.41 0.12 0.23 0.2 0.36 0.05 0.11

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

15000 0.02 0.05 0.13 0.2 0.35 0.50 0.14 0.28 0.24 0.44 0.06 0.10

16000 0.02 0.06 0.15 0.23 0.39 0.55 0.15 0.31 0.27 0.48 0.07 0.14

17000 0.02 0.07 0.17 0.26 0.43 0.60 0.17 0.35 0.3 0.54 0.08 0.15

15000 0.02 0.05 0.13 0.2 0.44 0.63 0.14 0.28 0.24 0.44 0.06 0.13

16000 0.02 0.06 0.15 0.23 0.49 0.69 0.15 0.31 0.27 0.48 0.07 0.14

17000 0.02 0.07 0.17 0.26 0.54 0.75 0.17 0.35 0.3 0.54 0.08 0.16

18000 0.03 0.08 0.19 0.29 0.59 0.82 0.18 0.38 0.33 0.58 0.09 0.18

19000 0.03 0.08 0.21 0.32 0.65 0.89 0.19 0.42 0.35 0.64 0.1 0.21

20000 0.03 0.09 0.23 0.36 0.71 0.96 0.2 0.45 0.38 0.67 0.11 0.23

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

ID Coil

away MERV 8 High Eff.

Filters2

MERV1

4 High

Eff

Inlet

Guide

Vanes Economizer

86 RT-SVX34C-EN

Page 87

Table 38. Supply Fan Drive Selection — 60Hz

7.5 HP 10 HP 15 HP 20 HP

Nominal Tons RPM

550 A 700 D

27.5T

30T

35T

40T

50T

Notes:

* For YC gas/electric only. ** For TC and TE Cooling and Electric Heat units only.

600 B 750* E

650 C

550 A 700 D

600 B 750 E

650 C

600 B 650 C 790** F

Drive No. RPM

700 D 800* G

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

Startup

Drive No.

RT-SVX34C-EN 87

Page 88

Startup

Table 39. 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 0.04 0.03

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

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

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

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

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

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

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

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

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

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

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

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

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

10800 0.01 0.03 0.08 0.13 0.20 0.31 0.12 0.21 0.18 0.29 0.04 0.08

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

12500 0.01 0.04 0.11 0.17 0.26 0.39 0.14 0.26 0.23 0.35 0.05 0.1

13300 0.02 0.05 0.12 0.19 0.29 0.42 0.15 0.28 0.25 0.37 0.06 0.11

14200 0.02 0.06 0.14 0.22 0.32 0.46 0.17 0.32 0.28 0.41 0.07 0.12

12500 0.01 0.04 0.11 0.17 0.33 0.48 0.14 0.26 0.23 0.35 0.05 0.1

13300 0.02 0.05 0.12 0.19 0.36 0.53 0.15 0.28 0.25 0.37 0.06 0.11

14200 0.02 0.06 0.16 0.24 0.40 0.58 0.17 0.34 0.29 0.42 0.07 0.12

15800 0.02 0.07 0.18 0.27 0.48 0.68 0.19 0.38 0.34 0.47 0.08 0.14

16700 0.03 0.08 0.2 0.3 0.53 0.74 0.2 0.41 0.36 0.52 0.09 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

Inlet

Guide

Vanes Economizer

88 RT-SVX34C-EN

Page 89

Table 40. 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 11 8

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

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

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

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

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

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

4320 31 24 21 23 36 55 22 36 34 57 25 15

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

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

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

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

5310 47 37 32 34 75 109 31 53 50 86 32 23

4720 2 7 18 27 43 67 26 43 38 65 8 17

5120 3 8 21 32 49 75 29 50 43 69 10 19

5510 3 10 24 37 56 84 31 55 48 77 11 21

5900 4 11 27 42 62 92 34 62 55 84 13 24

6290 4 12 31 48 69 101 36 67 60 88 15 27

6680 5 14 35 54 77 111 41 77 67 98 16 30

5900 4 11 27 42 78 115 34 62 55 84 13 24

6290 4 12 31 48 86 126 36 67 60 88 15 27

6680 5 14 35 54 96 139 41 82 72 100 16 30

7070 5 16 39 60 115 162 46 91 82 112 18 34

7470 6 18 44 67 126 176 48 98 86 124 21 39

Gas Heat Electric Heat ID Coil

Throw-

away

MERV 8 High

Eff.

MERV1

4 High

Eff

100 mm100

mm Economizer

Startup

Inlet Guide VanesLow High1 Element2 Element Dry Wet Adder 50 mm

RT-SVX34C-EN 89

Page 90

Startup

Table 41. Supply Air Fan Drive Selections - 50 Hz

Nominal

Tons (kW)

23 (80)

25 (88)

29 (103)

33 (118)

42 (146)

Notes:

1. *For YC gas/electrics only.

2. **For TC and TE Cooling only and with electric Heat units only.

7.5 hp (5.6 kW) 10 hp (7.5 kW) 15 hp (10 kW) 20 hp (15 kW)

rpm Drive No rpm Drive No rpm Drive No rpm Drive No

458A ——————

500B ——————

541C——————

583—583D ————

625 — 625* E ————

458A ——————

500B ——————

541C——————

583—583D ————

625—625E ————

500B ——————

541—541C————

583—583D ————

658 — — — 658** F — —

664 — — — 664* G — —

417—417H————

437—437J ————

479—479K————

521———521L ——

562———562M ——

604———604N——

437—437J ————

479—479K————

521———521L ——

562———562M ——

604—————604N

Exhaust Fan Operation

To start the optional power exhaust fans, use the economizer test procedures in Table 28, p. 74 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.

WARNIN G

Rotating Components!

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

90 RT-SVX34C-EN

Page 91

Startup

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 42, p. 92 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 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.

Note: To adjust the damper blade stops, refer to figures Figure 47, p. 93 to Figure 50, p. 94

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.

RT-SVX34C-EN 91

Page 92

Startup

Table 42. Power Exhaust Fan Performance—27.5-35 Ton—60 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (in)

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

Return Duct Static

(in. wc) CFM

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

Table 43. Power Exhaust Fan Performance—40-50 Ton—60 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (in)

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

Return Duct Static

(in. wc) CFM

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

Table 44. Power Exhaust Fan Performance—22.9 - 29.2 Ton—50 Hz

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

38.1 (min) 101.6 (max) 38.1 (min) 101.6 (max)

Return Duct Static

(Pa) L/s

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

92 RT-SVX34C-EN

Page 93

Table 45. Power Exhaust Fan Performance—33.3 - 41.7 Ton—50 Hz

Tracking Damper Minimum Adjustment Linkage

Power Exhaust Selection

50% (min) 100% (max)

Damper Blade Open Distance (mm)

38.1 (min) 101.6 (max) 38.1 (min) 101.6 (max)

Return Duct Static

(Pa) L/s

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

Figure 47. (Downflow) Tracking Exhaust Damper Adjustment

Startup

Figure 48. (Horizontal) Tracking Exhaust Damper Adjustment

RT-SVX34C-EN 93

Page 94

Startup

Less Exhaust

More Exhaust

Less Exhaust

More Exhaust

Figure 49. (Downflow) Standard Exhaust Maximum Damper Position

Figure 50. (Horizontal) Standard Exhaust Maximum Damper Position

Economizer Damper Adjustment

Economizer (O/A) Dampers

Arbitrarily adjusting the outside air dampers to open fully when the return air dampers are fully closed can overload the supply fan motor or deliver higher CFM to the space than designed. This causes higher operating duct static pressures and over pressurization of the space when the unit is operating in the "economizer” mode.

The 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 51, p. 97 illustrates the damper assembly and Table 46, p. 95 through Table 49, p. 96 list the various damper positions

94 RT-SVX34C-EN

based on the air flow (CFM) and the return duct losses (static pressure) for Downflow and Horizontal units.

To adjust the O/A damper for the correct pressure drop:

1. Measure the return duct static pressure.

2. Enter the calculated CFM from the previous section "Verifying Proper Airflow" Tab l e 36, p. 85 to obtain the return air damper pressure drop.

Page 95

Startup

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

4. Set the drive rod swivel to the appropriate hole according to Ta b le 46, p. 95 through Ta bl e 49,

p. 96. The units are shipped using hole "A" with no reference to any specific operating

condition.

Table 46. 27.5 - 35 Ton Downflow Units, 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

Ta bl e 46, p. 95 through Ta bl e 49, p. 96.

Return Air Duct Static +

Return Air Damper Static

(Inches of Water)

Drive Rod Position

Table 47. 27.5 - 35 Ton Horizontal Unit Economizer (O/A) Damper Static Pressure Setup

Return Air Duct Static +

System Design

CFM 0.200.400.600.801.001.201.40

Drive Rod Position

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 Damper Static

(Inches of Water)

RT-SVX34C-EN 95

Page 96

Startup

Table 48. 40 - 50 Ton Downflow Unit Economizer (O/A) Damper Static Pressure Setup

Return Air Duct Static +

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 Damper Static

(Inches of Water)

Drive Rod Position

Table 49. 40 - 50 Ton Horizontal Unit Economizer (O/A) Damper Static Pressure Setup

Return Air Duct Static + Return Air Damper

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

96 RT-SVX34C-EN

Static

(Inches of Water)

Drive Rod Position

Page 97

Figure 51. 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.

Startup

WARNIN G

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.

WARNIN G

Rotating Components!

During installation, testing, servicing and troubleshooting of this product it may be necessary to measure the speed of 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 when exposed to rotating components could result in death or serious injury.

5. Using the Service Test guide in Ta b le 28, p. 74, 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.

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Startup

6. With the supply fan "On" and rotating in the proper direction, measure the return duct static pressure.

7. Using the Table below, enter the desired amount of fresh air and the return air static pressure reading to obtain the proper damper opening dimension.

Table 50. Damper Adjustment

Damper Opening (In.) Return Air Static Pressure - Inches w.c.

Damper # 1Damper #

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.

Open the main power disconnect or the unit mounted disconnect switch to shut the unit off and to reset the RTRM.

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 28, p. 74 Table 29, p. 74 for the Cooling Test sequence.

Note: 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

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rotation. Refer to the unit wiring schematic and/or wire color markers vs. the compressor terminal block color markers.

Figure 52. Economizer (O/A) damper assembly

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.

Startup

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 Tab l e 5 1 , p . 10 1 through Table 64, p. 108 to determine the proper operating pressures for that circuit.

Jump across the "Test Terminals" once again. This will allow the second stage compressors to start. The first stage compressor will shut off providing the 3 minute "On" time has elapsed.

Note: When the second refrigerant circuit is requested to operate, both compressors of the 50 ton

unit will run simultaneously. Verify that the compressors are rotating in the correct direction.

Observe the operation of the compressor(s) and the system operating pressures. After compressors and condenser fans for the circuit have been operating for approximately 30 minutes, use Table 54, p. 103 through Table 64, p. 108 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 below.

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Startup

Figure 53. Line Weight Locations—50 Ton

Figure 54. Line Weight Locations—40 Ton

100 RT-SVX34C-EN

Trane TCD330B, TCD480B, TCD360B, TCD420B, TCD600B Installation & Operation Manual

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