Ingersoll Rand YSC072F, YSC120F, YSC060G, YSC063G, YSC036 User Manual

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Page 1

Installation, Operation, and Maintenance

Packaged Rooftop Air Conditioners Precedent™ — Cooling and Gas/Electric

3to10Tons–60Hz

Model Numbers

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.

May 2016

YSC033G - YSC063G YHC037E - YHC067E YSC036 - YSC060G YHC036E - YHC072E YSC072F - YSC120F YHC120F YHC048F - YHC060F YHC072F - YHC102F

SAFETY WARNING

RT-SVX21U-EN

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Introduction

Read thismanual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual as required.Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

WARNING

Proper Field Wiring and Grounding Required!

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

WARNING

CAUTIONs

NOTICE

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

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

Indicates a situationthat 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.

Important Responsible Refrigerant Practices

Trane believes that responsible refrigerant practices are

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

WARNING

Personal Protective Equipment (PPE) Required!

Failure to wear proper PPE for the job being undertaken could result in death or serious injury.Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the instructions below:

• Before installing/servicing this unit, technicians MUST put on all PPE required for the work being undertaken (Examples; cut resistant gloves/sleeves, butyl gloves, safety glasses, hard hat/bump cap, fall protection, electrical PPE and arc flash clothing).

ALWAYS refer to appropriate Material Safety Data

Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS/SDS and

OSHA/GHS (Global Harmonized System of Classification and Labelling of Chemicals) guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.

• If there is a risk of energized electrical contact, arc, or flash, technicians MUST put on all PPE in accordance with OSHA, NFPA 70E, or other country-specific requirements for arc flash protection, PRIOR to servicing the unit. NEVER PERFORM ANY SWITCHING, DISCONNECTING, OR VOLTAGE

TESTING WITHOUT PROPER ELECTRICAL PPE AND ARC FLASH CLOTHING. ENSURE ELECTRICAL

METERS AND EQUIPMENT ARE PROPERLY RATED FOR INTENDED VOLTAGE.

This document and theinformation in it are the propertyof Trane, and may not be used or reproduced in whole or in

part without written permission.Trane reserves the right to revise this publication at any time, and to make changes

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to its content without obligation to notify any person of such revision or change.

Trademarks

All trademarks referenced in this document are the trademarks of their respective owners.

Revision History

• Added Air-Fi™ Wireless Communication Interface

• Unit start-up, removal of MMC

• Limited warranty updates

Introduction

RT-SVX21U-EN 3

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Model Number Descriptions - 3 to 10 Tons (T/Y)

Model Number Notes ................. 7

Model Number Descriptions - 3 to 5 Tons (T/Y 17 Plus)

................................. 9

Model Number Notes ................ 10

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

Unit Inspection ..................... 11

Storage ........................... 11

Unit Nameplate .................... 11

Compressor Nameplate .............. 11

Microchannel Coil Barcode ID ......... 11

Unit Description .................... 11

Economizer Control Actuator (Optional) 11

System Input Devices & Functions ..... 12

Low Pressure Control ................ 13

High Pressure Control ............... 13

Power Exhaust Control (Optional) ..... 13

Lead/Lag Control (Dual Circuit Only) . . . 13

Evaporator Frost Control ............. 14

Discharge Line Temp Switch (DLTS) . . . 15

Smoke Detector Sensor (Optional) ..... 15

Phase Monitor ..................... 15

Single Zone Variable Air Volume / Displace-

ment Ventilation (Optional) ........... 15

Human Interface - 5 Inch Color Touchscreen

(Optional) ......................... 15

Unit Dimensions ........................ 16

Installation ............................. 24

Pre-Installation ....................... 24

Pre-Start ................................47

Procedure ........................... 24

Foundation .......................... 26

Horizontal Units .................... 26

Ductwork ............................ 27

Roof Curb ........................... 28

Downflow ......................... 28

Rigging ........................... 29

General Unit Requirements ............ 29

4 RT-SVX21U-EN

Factory Installed Economizer ..........30

Temperature Limit Switch Usage for Gas

Heat Units ..........................30

Horizontal Discharge Conversion (3 to 5 Ton Units)

................................31

TCO1 Instructions .....................31

Horizontal Discharge Conversion (6 to 10 Ton Units)

................................32

TCO1 Instructions .....................33

Return Air Smoke Detector .............33

Air-Fi™ Wireless Communication Interface 34

Main Electrical Power Requirements .....34

Through-the-Base Gas Installation .......35

Requirements for Gas Heat .............35

Condensate Drain Configuration .........36

Filter Installation ......................36

Field Installed Power Wiring ............37

Main Unit Power ......................37

Standard Wiring .....................37

Optional TBUE Wiring (Through-the-Base

Electrical Option) ....................37

Field-Installed Control Wiring ..........38

Control Power Transformer ...........38

Controls Using 24 VAC ...............38

Controls using DC Analog Input/Outputs (Standard Low Voltage Multi

conductor Wire) .....................39

DC Conductors ......................39

Space Temperature Averaging (ReliaTel™ Only)

...................................44

Voltage Imbalance .....................47

Electrical Phasing (Three Phase Motors) ..47

Compressor Crankcase Heaters (Optional) 48

ReliaTel™ Controls ..................48

Test Modes ...........................49

ReliaTel™ Controls ..................49

Electromechanical Controls Test

Procedure ..........................50

Page 5

Table of Contents

Unit Start-Up ........................... 51

Verifying Proper Air Flow .............. 51

Units with 5-Tap Direct Drive Indoor Fan 51

Units with Belt Drive Indoor Fan ....... 51

Units with Direct Drive Indoor Fan - Electro-

mechanical Control ................. 52

ReliaTel™ Units with Direct Drive Indoor Fan (10 Tons Standard Efficiency, 6(074) to 10

Tons High Efficiency) ................ 52

Units with Constant CFM Direct Drive Indoor

Fan ............................... 53

17 Plus units with the constant CFM direct

drive indoor fan .................... 53

Variable Air Volume Applications (Traditional

VAV) .............................. 54

Supply Duct Static Pressure Control .... 55

Traditional VAV Standalone Operation . 55

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

Return Air Smoke Detector ........... 55

Economizer Start-Up ................ 56

Compressor Start-Up ................ 57

Dehumidification Option ............. 57

Gas Heat Units ..................... 57

Final System Setup ................. 57

Maintenance ........................... 59

Fan Belt Adjustment - Belt Drive Units ... 59

Monthly Maintenance ................. 60

Filters ............................. 60

Return Air Smoke Detector Maintenance 60

Condensate Overflow Switch ......... 60

Cooling Season .................... 60

Heating Season .................... 60

Coil Cleaning ....................... 61

Annual Maintenance .................. 62

Clogged Filter Switch .................65

Fan Failure Switch ...................65

Condensate Overflow Switch ..........65

Zone Temperature Sensor (ZTS) Tests ...65

Test 1 - Zone Temperature Thermistor

(ZTEMP) ...........................65

Test 2 - Cooling Set Point (CSP) and Heating

Set Point (HSP) ......................65

Test 3 - System Mode and Fan Selection .65

Test 4 - LED Indicator Test, (SYS ON, HEAT,

COOL & SERVICE) ...................66

Relative Humidity Sensor Test .........66

Programmable & Digital Zone Sensor

Test ...............................66

ReliaTel™ Refrigeration Module (RTRM) De-

fault Chart ..........................66

Unit Operation without a Zone Sensor . .66

Unit Economizer Control (ECA) Troubleshooting

...................................67

ReliaTel™ Control ...................67

Electromechanical Control ............67

Unit Economizer Control (ECA) Test Procedures

................................69

Electromechanical Control ............69

Troubleshooting procedures for Direct Drive Plenum Fan

...........................69

Unit Wiring Diagrams Numbers ...........70

Limited Warranty ........................73

Combination Gas Electric Air Conditioner .73

YCD, YCH, YSC and YHC (Parts Only) . . .73

Models Less Than 20 Tons for Commercial

Use* ..............................73

Troubleshooting ........................ 63

ReliaTel™ Control .................... 63

System Status Checkout Procedure ..... 63

Method 1 .......................... 63

Resetting Cooling and Ignition Lockouts 65

Zone Temperature Sensor (ZTS) Service Indicator

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................................ 65

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Model Number Descriptions-3to10Tons(T/Y)

Digit 1 - Unit Type

T DX Cooling Y DX Cooling, Gas Heat

Digit2-Efficiency

S Standard Efficiency H High Efficiency

Digit 3 - Airflow

C Convertible

Digit 4,5,6 - Nominal Gross Cooling Capacity (MBh)

033 3Ton (13 SEER) 036 3Ton 043 4Ton (13 SEER) 048 4Ton 060 5Ton 063 5Ton (13 SEER) 072 6Ton 074 6Ton, Dual Compressor 090 7½Ton, Single Compressor 092 7½Ton, Dual Compressor 102 8½ Ton 120 10 Ton

Digit 7 - Major Design Sequence

E R-410A Refrigerant F MicrochannelType Condenser

Coils

G MicrochannelType Evaporator and

Condenser Coils

Digit 8 - Voltage Selection

1 208/230/60/1 3 208-230/60/3 4 460/60/3

W 575/60/3

Digit 9 - Unit Controls

E Electromechanical R ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

Note: Applicable to Digit 1,T models

0 No Electric Heat

A 5 kW (1 phase)

B 6 kW (3 phase) C 9 kW (3 phase) D 10 kW (1 phase) E 12 kW (3 phase) F 14 kW (1 phase) G 18 kW (1&3 phase) J 23 kW (3 phase) K 27 kW (3 phase) N 36 kW (3 phase) P 54 kW (3 phase)

Note: Applicable to Digit 1,Y models

L Low Heat M Medium Heat H High Heat X Low Heat, Stainless Steel Heat

Y Medium Heat, Stainless Steel Heat

Z High Heat, Stainless Steel Heat

only

Exchanger

Digit 11 - Minor Design Sequence

A First Sequence B Second Sequence

Digit 12,13 - Service Sequence

** Factory Assigned

Digit 14 - Fresh Air Selection

0 No Fresh Air A Manual Outside Air Damper 0-50% B Motorized Outside Air Damper

C Economizer, Dry Bulb 0-100%

D Economizer, Dry Bulb 0-100% with

E Economizer, Reference Enthalpy

F Economizer, Reference Enthalpy

G Economizer, Comparative Enthalpy

H Economizer, Comparative Enthalpy

0-50%

without Barometric Relief

Barometric Relief

0-100% without Barometric Relief

0-100% with Barometric Relief

3,7

0-100% without Barometric Relief

0-100% with Barometric Relief

3,7

K Low Leak Economizer with

Barometric Relief

M Low Leak Economizer with Reference

Enthalpy with Barometric Relief

P Low Leak Economizer with

Comparative Enthalpy with Barometric Relief

Digit 15 - Supply Fan/DriveType/ Motor

0 Standard Drive 1 Oversized Motor 2 Optional Belt Drive Motor 6 Single Zone VAV 7 Multi-Speed Indoor Fan E VAV Supply Air Temperature Control

Standard Motor

27,34

Digit 16 - Hinged Service

Access/Filters

0 Standard Panels/Standard Filters

A Hinged Access Panels/Standard

Filters B Standard Panels/2” MERV 8 Filters C Hinged Access Panels/2” MERV 8

Filters D Standard Panels/2” MERV 13 Filters E Hinged Access Panels/2” MERV 13

Filters

Digit 17 - Condenser Coil Protection

0 Standard Coil 1 Standard Coil with Hail Guard 2 Black Epoxy Pre-Coated Condenser

Coil 3 Black Epoxy Pre-Coated

Condenser Coil with Hail Guard 4 CompleteCoat™ Condenser Coil 5 CompleteCoat™ Condenser Coil

with Hail Guard

Digit 18 - Through-the-Base Provisions

Note: Applicable to Digit 1,T or Y

models

0 NoThrough-the-Base Provisions A Through-the-Base Electric

Note: Applicable to Digit 1,Y models

only

B Through-the-Base Gas Piping

C Through-the-Base Electric and Gas

Piping

Digit 19 - Disconnect/Circuit Breaker (three-phase only)

0 No Disconnect/No Circuit Breaker 1 Unit Mounted Non-Fused

Disconnect

2 Unit Mounted Circuit Breaker

Digit 20 - Convenience Outlet

0 No Convenience Outlet A Unpowered Convenience Outlet B Powered Convenience Outlet

(three-phase only)

Digit 21 - Communications Options

0 No Communications Interface 1 Trane® Communications Interface 2 LonTalk® Communications

3 Novar 2024 Controls 4 Novar 3051 Controls without Zone

5 Novar 3051Controls Interface with

6 BACnet® Communications Interface 7 Air-Fi™ Wireless Communications

Interface

Sensor

DCV

Digit 22 - Refrigeration System Option

0 Standard Refrigeration System B Dehumidification Option

Digit 23 - Refrigeration Controls

Note: Applicable to Digit7=E,F,G

0 No Refrigeration Control 1 Frostat™ 2 Crankcase Heater 3 Frostat™

11 ,30

and Crankcase Heater

Digit 24 - Smoke Detector

0 No Smoke Detector A Return Air Smoke Detector B Supply Air Smoke Detector C Supply and Return Air Smoke

Detectors

D Plenum Smoke Detector

12,13

22,23

12,13

6 RT-SVX21U-EN

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Model Number Descriptions-3to10Tons(T/Y)

Digit 25 - System Monitoring Controls

0 No Monitoring Control 1 Clogged Filter Switch 2 Fan Failure Switch 3 Discharge Air Sensing Tube 4 Clogged Filter Switch and Fan

Failure Switch

5 Clogged Filter Switch and Discharge

Air SensingTube

6 Fan Failure Switch and Discharge Air

SensingTube

7 Clogged Filter Switch, Fan Failure

Switch and Discharge Air SensingTube

8 Novar Return Air Sensor

(NOVAR 2024)

9 Novar ZoneTemp Sensor

(NOVAR 3051)

A Condensate Drain Pan Overflow

Switch

B Clogged Filter Switch14and

Condensate Drain Pan Overflow Switch

C Fan Failure Switch14and Condensate

Drain Pan Overflow Switch

D Discharge Air Sensing14and

Condensate Drain Pan Overflow Switch

E Clogged Filter Switch14, Fan Failure

Switch14and Condensate Drain Pan Overflow Switch

F Clogged Filter Switch14, Discharge

Air SensingTube14and Condensate Drain Pan Overflow Switch

G Fan Failure Switch, Discharge Air

SensingTube14and Condensate Drain Pan Overflow Switch

H Clogged Filter Switch14, Fan Failure

Switch14, Discharge Air Sensing and Condensate Drain Pan Overflow Switch

15,31

19,31

Digit 26 - System Monitoring Controls

0 No Monitoring Controls

A Demand Control Ventilation

B Low Leak Economizer with FDD

C FDD (Fault Detection & Diagnostics)

32,33

(CO2)

(Fault Detection & Diagnostics)

with DCV (Demand Control Ventilation)

Digit 27 - Unit Hardware Enhancements

0 No Enhancements 1 Stainless Steel Drain Pan

Digit 31 - Advanced Unit Controls

0 Standard Unit Controls 1 Human Interface

Model Number Notes

1. Available on 3 to 5 ton models.

2. Crankcase heaters are optional on (T,Y)SC (036, 048, 060, 072, 090, 102, 120); standard on

(T,Y)HC (036, 048, 060, 072, 074, 092, 102, 120).

3. Not available with electromechanical controls.

4. Manual outside air damper will ship factory supplied within the unit, but must be field installed.

5. High pressurecontrol isstandard on all units.

6. Multi-speed, direct drive motor with no belt drive option is standard on 3 to 5 ton, standard efficiency, 13/14 SEER units. Multi-speed, direct drive motor with a belt drive option is available for 3 to 5 ton, 15 SEER units. On 6 to 10 tons, multispeed direct drive is standard on all 10 ton and 6 (074) to 8½ ton high efficiency. Belt drive is standard on all other units.

Digit 15 = 0

Standard Efficiency 3 Phase (3 to 5 T on) = Multispeed Direct Drive Motor 3 Phase (6 to 8½ Ton) = Belt Drive 3 Phase (10 T on) = Ultra High Efficiency Direct Drive Plenum Fan High Efficiency 1 Phase = High Efficiency Multispeed Direct Drive Motor 3 Phase (3 to 5 ton) = High Efficiency Multispeed Direct Drive Motor 3 Phase (3 to 5 ton w/Dehumidification) = Belt Drive Motor 3 Phase [6 (074) to 10 ton] = Ultra High Efficiency Direct Drive Plenum Fan

7. Economizer with barometric relief is for downflow configured units only. Order economizer without barometric relief for horizontal configuration. Barometric relief for horizontal configured units mustbe ordered as field installed accessory.

8. Through-the-base electric required when ordering disconnect/circuit breaker options.

9. Requires use of disconnect or circuit breaker.

Not Available

Standard Efficiency 3 to 5 Tons and 10 Ton w/575V High Efficiency 3 to 5 T ons w/Standard Indoor Motor w/460V High Efficiency 575V

10. Standard metering devices are TXVs.

11. Frostat™ cannot be field installed

in electro-mechanical units.

12. The return air smoke detector

may not fitup or work properly on the Precedent™ units when used in conjunction with 3rd party accessories such as bolt on heat wheels, economizers and power exhaust. Do not order the return air smoke detectors when using this type of accessory.

13. Return air smoke detector cannot

be ordered with Novar controls.

14. These options are standard when

ordering Novar controls.

15. This option is used when

ordering Novar controls.

16. Includes gas piping and shutoff

(field assembly required).

17. Not available with high

temperature duct sensor accessory.

18. Digit 15 = 2

Standard Efficiency 3 Phase = Not Available High Efficiency 1 Phase = Not Available 3 Phase (3 to 5 tons) = May be Ordered 3 Phase (3 to 5 tons w/dehumidification) = Not Available 3 Phase (6 to 10 tons) = Not Available

19. Novar sensor utilized with

Digit 21 = (4) Novar 3051 controls without zone sensor.

20. Available for gas/electric, 3 to 5

tons, high efficiency,single phase models.

21. Available for all models except

gas/electric, 3 to 5 tons high efficiency, single phase.

22. Requires selection of 2” pleated

filters (option B or C) for Digit 16.

23. Not available on all single phase

or standard efficiency.

24. Standard onT/YSC 6, 7½ (single

and dual systems), 8½, 10 ton standard efficiency models and

RT-SVX21U-EN 7

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Model Number Descriptions-3to10Tons(T/Y)

T/YHC 4, 5, 6, 7½, 8½, 10 ton

MCHE high efficiency models (except for 4, 5, 6 ton dehumidification models).

25. Not available on high efficiency 575V.

26. Epoxy coil and epoxy with hail guard options are not available for units with microchannel condenser coil.

27. Single zoneVAV is only available on 6 to 10 tons high efficiency and 10 ton standard efficiency products with ReliaTel™ controls.

28. Multi-speed indoor fan available only on 6, 7½ & 8½ tons high efficiency, and 10 ton products with ReliaTel™ controls.

29. Motorized outside air damper is not available on multi-speed or SZVAV (single zone variable air volume) products.

30. Frostat™ standard onY/TSC033 to 063G electromechanical, multispeed and SZVAV (single zone variable air volume) products.

31. Novar is not available withSZVAV products.

32. Demand control ventilation not available with electromechanical controls.

33. Demand control ventilation option includes wiring only.The C0

sensor is afield-installed only

option.

34. Discharge air sensing is also standard equipment on units with single zone and supply air temperature control VAV.

35. Must be usedwith BACnet® open protocol.

8 RT-SVX21U-EN

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Model Number Descriptions-3to5Tons(T/Y - 17 Plus)

Digit 1 - Unit Type

T DX Cooling Y DX Cooling, Gas Heat

Digit2-Efficiency

S Standard Efficiency H High Efficiency

Digit 3 - Airflow

C Convertible

Digit 4,5,6 - Nominal Gross Cooling Capacity (MBh)

037 3Ton 047 4Ton 067 5Ton

Digit 7 - Major Design Sequence

E R-410A Refrigerant

Digit 8 - Voltage Selection

3 208-230/60/3 4 460/60/3

W 575/60/3

Digit 9 - Unit Controls

R ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

Note: Applicable to Digit 1,T models

0 No Electric Heat B 6 kW (3 phase) E 12 kW (3 phase) G 18 kW (1&3 phase) J 23 kW (3 phase)

Note: Applicable to Digit 1,Y models

L Low Heat M Medium Heat H High Heat X Low Heat, Stainless Steel Heat

Y Medium Heat, Stainless Steel Heat

Z High Heat, Stainless Steel Heat

only

Exchanger

Digit 11 - Minor Design Sequence

A First Sequence

Digit 12,13 - Service Sequence

** Factory Assigned

Digit 14 - Fresh Air Selection

0 No Fresh Air

A Manual Outside Air Damper 0-50%

B Motorized Outside Air Damper

0-50%

C Economizer, Dry Bulb 0-100%

without Barometric Relief

D Economizer, Dry Bulb 0-100%

with Barometric Relief

E Economizer, Reference Enthalpy

0-100% without Barometric Relief

F Economizer, Reference Enthalpy

0-100% with Barometric Relief

G Economizer, Comparative

Enthalpy 0-100% without Barometric Relief

H Economizer, Comparative

Enthalpy 0-100% with Barometric

Relief

K Low Leak Economizer with

Barometric Relief

M Low Leak Economizer with Reference

Enthalpy with Barometric Relief

P Low Leak Economizer with

Comparative Enthalpy with Barometric Relief

Digit 15 - Supply Fan/DriveType/ Motor

0 Standard Drive 6 Single Zone VAV E VAV Supply Air Temperature Control

Standard Motor

Digit 16 - Hinged Service

Access/Filters

0 Standard Panels/Standard Filters

A Hinged Access Panels/Standard

Filters B Standard Panels/2” MERV 8 Filters C Hinged Access Panels/2” MERV 8

Filters D Standard Panels/2” MERV 13 Filters E Hinged Access Panels/2” MERV 13

Filters

Digit 17 - Condenser Coil Protection

0 Standard Coil 1 Standard Coil with Hail Guard 2 Black Epoxy Pre-Coated Condenser

Coil 3 Black Epoxy Pre-Coated

Condenser Coil with Hail Guard 4 CompleteCoat™ Condenser Coil 5 CompleteCoat™ Condenser Coil

with Hail Guard

Digit 18 - Through the Base Provisions

0 NoThrough-the-Base Provisions A Through-the-Base Electric B Through-the-Base Gas Piping C Through-the-Base Electric and Gas

Piping

Digit 19 - Disconnect/Circuit Breaker (three-phase only)

0 No Disconnect/No Circuit Breaker 1 Unit Mounted Non-Fused

Disconnect

2 Unit Mounted Circuit Breaker

Digit 20 - Convenience Outlet

0 No Convenience Outlet A Unpowered Convenience Outlet B Powered Convenience Outlet

(three-phase only)

Digit 21 - Communications Options

0 No Communications Interface 2 LonTalk® Communications

Interface 3 Novar 2024 Controls 4 Novar 3051 Controls without Zone

Sensor 5 Novar 3051Controls Interface with

DCV 6 BACnet® Communications Interface 7 Air-Fi™ Wireless Communications

Digit 22 - Refrigeration System Option

0 Standard Refrigeration System B Dehumidification Option

Digit 23 - Refrigeration Controls

Note: Applicable to Digit7=E

0 No Refrigeration Control 1 Frostat™ 2 Crankcase Heater

3 Frostat and Crankcase Heater

Digit 24 - Smoke Detector

0 No Smoke Detector A Return Air Smoke Detector B Supply Air Smoke Detector C Supply and Return Air Smoke

Detectors

9,10

D Plenum Smoke Detector

Digit 25 - System Monitoring Controls

0 No Monitoring Control 1 Clogged Filter Switch 2 Fan Failure Switch 3 Discharge Air Sensing Tube 4 Clogged Filter Switch and Fan

Failure Switch 5 Clogged Filter Switch and Discharge

Air SensingTube 6 Fan Failure Switch and Discharge Air

SensingTube

9,10

7 Clogged Filter Switch, Fan Failure

Switch and Discharge Air

SensingTube

RT-SVX21U-EN 9

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Model Number Descriptions-3to5Tons(T/Y - 17 Plus)

8 Novar Return Air Sensor

(NOVAR 2024)

9 Novar ZoneTemp Sensor

(NOVAR 3051)

A Condensate Drain Pan Overflow

Switch

B Clogged Filter Switch11and

Condensate Drain Pan Overflow Switch

C Fan Failure Switch11and Condensate

Drain Pan Overflow Switch

D Discharge Air Sensing11and

Condensate Drain Pan Overflow Switch

E Clogged Filter Switch11, Fan Failure

Switch11and Condensate Drain Pan Overflow Switch

F Clogged Filter Switch11, Discharge

Air SensingTube11and Condensate Drain Pan Overflow Switch

G Fan Failure Switch11, Discharge Air

SensingTube11and Condensate Drain Pan Overflow Switch

H Clogged Filter Switch11, Fan Failure

Switch11, Discharge Air Sensing and Condensate Drain Pan Overflow Switch

12,20

15,20

Digit 26 - System Monitoring Controls

0 No Monitoring Controls

A Demand Control Ventilation

B Low Leak Economizer with FDD

C FDD (Fault Detection & Diagnostics)

18,19

(CO2)

(Fault Detection & Diagnostics)

with DCV (Demand Control Ventilation)

Digit 27 - Unit Hardware Enhancements

0 No Enhancements 1 Stainless Steel Drain Pan

Digit 31 - Advanced Unit Controls

0 Standard Unit Controls 1 Human Interface

Model Number Notes

1. Standard on all variable stage units.

2. Manual outside air damper will ship factory supplied within the unit, but must be field installed.

3. High pressure controlis standard on all units.

4. Direct drive is standard for 3 to 5 ton variable stage units.

Digit 15 = 0, 6

3 Phase (3-5 ton) - High Efficiency Constant CFM

5. Economizer with Barometric Relief is for downflow configured units only. Order Economizer without Barometric Relief for

horizontal configuration. Barometric Relief for horizontal configured units mustbe ordered as field installed accessory.

6. Through the base electric required when ordering disconnect/circuit breaker options.

7. Requires use of Disconnect or Circuit Breaker.

Not Available

High Efficiency 3-5 ton w/Standard Indoor Motor w/460V or 575V

8. Standard metering devices are

TXVs.

9. The return air smoke detector may not fitup or workproperly on the Precedent units when used in conjunction with 3rd party accessories such as bolt on heat wheels, economizers and power exhaust. Do not order the return air smoke detectors when using this type of accessory.

10. Return Air Smoke Detector cannot be ordered with Novar Controls.

11. These options are standard when ordering Novar Controls.

12. This option is used when ordering Novar Controls.

13. Includes gas piping and shutoff (field assembly required).

14. Not available with high temperature duct sensor accessory.

15. Novar Sensor utilized with Digit 21 = (4)Novar 3051 Controls without Zone Sensor.

16. Available forT/Y 3,4,5 ton high efficiency models.

17. Requires selection of 2” Pleated Filters (option B or C) for Digit 16.

18. Demand Control Ventilation not available with electromechanical controls.

19. Demand Control Ventilation Option includes wiring only.The CO

sensor is a field-installed

only option.

20. Novar is not available with SZVAV products.

21. Discharge Air Sensing is also standard equipment on units with Single Zone and Supply Air

Temperature Control VAV.

22. Must be usedwith BACnet® open protocol.

10 RT-SVX21U-EN

Page 11

General Information

Unit Inspection

As soon as the unit arrives at the job site

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

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

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

If the job site inspection of the unit reveals damage or material shortages, file a claim with the carrier immediately.Specify the typeand extent ofthe damage on the “bill of lading” before signing.

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

• If concealed damage is discovered, notify the carrier’s terminal of damage 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 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.

• Notify the appropriate sales representative before installing or repairing a damaged unit.

Storage

Take precautions to prevent condensate from forming

inside the unit’s electrical compartments and motors if:

1. the unit is stored before it is installed; or,

2. the unit is set on the roof curb, and temporary heat is provided in the building. Isolate all side panel service entrances and base pan openings (e.g., conduit holes, Supply Air and Return Air openings, and flue openings) from the ambient air until the unit is ready for start-up.

Note: Do not use the unit’s heater for temporary heat

without first completing the start-up procedure detailed under “Unit Start-Up,” p. 51”.

The manufacturer will not assume any responsibility for

equipment damage resulting from condensate accumulation on the unit’s electrical and/or mechanical components.

Unit Nameplate

A Mylar unit nameplate is located on the unit’s corner

support next to the filter access panel. It includes the unit model number, serial number, electrical characteristics, refrigerant charge, as well as other pertinent unit data.

Compressor Nameplate

The nameplate forthe compressors are locatedon the side

of the compressor.

Microchannel Coil Barcode ID

Barcode decal used for coil part identification can be located on the header and top of coil's inlet/outlet side.

Unit Description

Before shipment, each unit is leak tested, dehydrated, charged with refrigerant and compressor oil, and run tested for proper control operation.

The condenser coilsare either aluminum fin, mechanically

bonded to copper tubing or all aluminum microchannel.

Direct-drive, vertical discharge condenser fans are provided with built-in thermal overload protection.

There are two control systems offered for these units.The

electromechanical control option uses a thermostat to perform unit functions.The ReliaTel™ Control Module is a microelectronic control system that is referred to as “Refrigeration Module” (RTRM). The acronym RTRM is used extensively throughout this document when referring to the control system network.

These modules through Proportional/Integral control

algorithms perform specific unit functions that governs unit operation inresponse to; zone temperature, supply air temperature, and/or humidity conditions depending on the application.The stages of capacity control for these units are achieved by starting and stopping the compressors.

The RTRM is mounted in the control panel and is factory

wired to the respective internal components.The RTRM receives and interprets information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request for cooling.

Economizer Control Actuator (Optional)

Electromechanical Control

The ECA monitors the mixedair temperature, ambient dry

bulb temperature and local minimum position setpoint sensors, if selected, to control dampers to an accuracy of +/- 5% of stroke.The actuator is spring returned to the closed position any time that power is lost to the unit. It is capable of delivering up to 25 inch pounds of torque and is powered by 24 VAC.

ReliaTel™ Control

The ECA monitors the mixed air temperature, return air

temperature, minimum position setpoint (local or remote), power exhaust setpoint, CO ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity against ambient humidity) sensors, if selected, to control dampers to an accuracy of

setpoint, CO2, and

RT-SVX21U-EN 11

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General Information

+/- 5% of stroke.The actuator is spring returned to the closed position any time that power is lost to the unit. It is capable of delivering up to 25 inch pounds of torque and is powered by 24 VAC.

RTCI - ReliaTel™ Trane Communication Interface (Optional)

This module is used when the application calls for an

ICSTM building management type control system. It allows the control and monitoring of the system through an ICS panel.The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installation instruction that ships with each kit when field installation is necessary.

RLCI - ReliaTel™ LonTalk® Communication Interface (Optional)

This module is used when the application calls for an

ICSTM building management type control system that is LonTalk. Itallows the control and monitoringof the system through an ICS panel.The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installation instruction that ships with each kit when field installation is necessary.

RBCI - ReliaTel™ BACnet Communications Interface (Optional)

This module is used when the application calls foran open

BACnet protocol. It allows the control and monitoring of the system through an ICS panel.The module can be ordered from the factory or as a kit to be field installed. Follow the installation instructions that ships with each kit when field installation is necessary.

RTOM - ReliaTel™ Options Module (Standard on 17 Plus, 6Ton (074), 7.5 Ton & 8.5 Ton High Efficiency with ReliaTel, 10Ton with ReliaTel)

The RTOMmonitors the supply fan proving, cloggedfilter,

supply air temperature, exhaust fan setpoint, supply air tempering, Frostat™, smoke detector, and Variable Speed Fan Control (17 Plus units only). Refer to system input devices and functions for operation.

System Input Devices & Functions

The RTRM must have a zone sensor or thermostat input in

order to operate the unit.The flexibility of having several mode capabilities dependsupon the type of zone sensor or thermostat selected to interface with the RTRM.

The descriptions of the following basic InputDevices used

within the RTRM network are to acquaint the operator with their function as they interface with the various modules. Refer to the unit’s electrical schematic for the specific module connections.

The following controls are available from the factory for

field installation.

Supply Fan Failure Input (Optional)

The Fan Failure Switch can be connected to sense indoor

fan operation:

FFS (Fan Failure Switch) If air flow through the unit is not proven by the differential pressure switch connected to the RTOM (factory set point 0.07 “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 output will flash.The system will remain locked out until a reset is initiated either manually or through ICS.

Clogged Filter Switch (Optional)

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. A diagnostic SERVICE signal is sent to the remote panel if the pressure differential across the filters is at least

0.5" w.c.The contacts will automatically open when the pressure differential across the filters decreases to approximately 0.4" w.c.The clogged filter output is energized when the supply fan is operating and the clogged filter switch has been closedfor at least 2 minutes.

The system will continue to operate regardless of the

status of the filter switch.

Note: On units equipped with factory installed MERV 13

filters, a clogged filter switch with different pressure settings will be installed. This switch will close when the differential pressure is approximately 0.8' w.c. and open when the differential falls to 0.7" w.c.

Condensate Drain Pan Overflow Switch (Optional)

ReliaTel™ Option

This input incorporates the Condensate Overflow Switch

(COF) mounted on the drain pan and the ReliaTel Options Module (RTOM).When the condensate level reaches the trip point for 6 continuous seconds, the RTOM will shut down all unit functions until the overflow condition has cleared.The unit will return to normal operation after 6 continuous seconds with the COF in a non-tripped condition. If the condensate level causes unit shutdown more than 2 times in a 3 days period, the unit will be locked-out of operation requiring manual reset of diagnostic system through Zone Sensor or Building Automation System (BAS). Cycling unit power will also clear the fault.

Electromechanical Option

This input incorporates the condensate overflow switch

(COF), COF Relay, COFTime Delay.When the condensate level reaches the trip point, the COF relay energizes and opens the 24VAC control circuit which disables the unit. Once the 24VAC control circuitis opened, adelay timer will prevent unit start-up for three minutes.

12 RT-SVX21U-EN

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General Information

Compressor Disable (CPR1/2)

This input incorporates the low pressure control (LPC) of

each refrigeration circuit and can be activated by opening a field supplied contact installed on the LTB.

If this circuit is open before the compressor is started, the compressor will not be allowed to operate. Anytime this circuit is opened for 1 continuous second during compressor operation, the compressor for that circuit is immediately turned “Off”. The compressor will not be allowed to restart for a minimum of 3 minutes should the contacts close.

If four consecutive open conditions occur during the first three minutes of operation,the compressor for that circuit will be locked out, a diagnostic communicated to the remote panel (if installed), and a manual reset will be required to restart the compressor.

Low Pressure Control

ReliaTel™ Control

When the LPC is opened for 1 continuous second, the

compressor for that circuit is turned off immediately.The compressor will not be allowed to restart for a minimum of 3 minutes.

If four consecutive open conditions occur during an active call for cooling, the compressor will be locked out, a diagnostic communicated to ICS™, if applicable, and a manual reset required to restart the compressor. On dual compressor units only the affected compressor circuit is locked out.

Electromechanical Control

When the LPC is opened, the compressor for that circuit is

turned off immediately.The compressor will restart when the LPC closes.

High Pressure Control

ReliaTel™ Control

The high pressure controls are wiredin series between the

compressor outputs on the RTRM and the compressor contactor coils. If the high pressure control switch opens, the RTRM senses a lack of current while calling for cooling and locks the compressor out.

Electromechanical Control

When the HPC is opened, the compressor for that circuit is

turned off immediately.The compressor will restart when the HPC closes.

Power Exhaust Control (Optional)

ReliaTel™ Control

The power exhaust fan is started whenever the position of

the economizer dampers meets or exceed the power exhaust setpoint when the indoor fan is on.

With the optional ventilation override accessory, the

power exhaust fan is independent of the indoor fan.

The setpoint panel is located in the return air section and

is factory set at 25%.

Electromechanical Control

The power exhaust fan is started whenever the indoor fan

is on and the adjustable damper limit switch DLS is closed.

Lead/Lag Control (Dual Circuit Only)

ReliaTel™ Control Only

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 cut the wire connected to J3-8 at the RTRM. When it is activated, each time the designated lead compressor 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 circuit compressor. Lead/ Lag is not available on Multi-Speed Indoor Fan, or Single Zone Variable Air Volume (SZVAV) products.

Zone Sensor Module (ZSM) (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. (Cooling Setpoint Only)

Zone Sensor Module (ZSM) (BAYSENS108*)

This electronic sensorfeatures 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*.

Zone Sensor (BAYSENS110*)

This electronic sensorfeatures 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*.

Wall Mounted Relative Humidity Sensor

(BAYSENS036*)

Field installed, wall mounted humidity sensor is used to control activation of Enhanced Dehumidification and the Hot Gas Reheat Dehumidification options. Humidity set points can beselected for relativehumidity levels between

RT-SVX21U-EN 13

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General Information

40% and 60% by adjusting the DEHUMID setting on the ReliaTel Options Module. See Figure 45, p. 40.

Duct Mounted Relative Humidity Sensor (BAYSENS037*)

Field installed, duct mounted humidity sensor is used to control activation of Enhanced Dehumidification and the hot gas reheat dehumidification options. Humidity set points can beselected for relativehumidity levels between 40% and 60% by adjusting the DEHUMID setting on the ReliaTel Options Module. See Figure 45, p. 40.

Programmable Zone Sensor - (BAYSENS119*)

This 7 day programmable sensor features 2, 3 or 4 periods

for Occupied or Unoccupied programming per day. If the power is interrupted, the program is retained in permanent memory. If power is off for an extended period of time, only the clock and day may have to be reset.

The Zone Sensor allows selection of 2, 3 or 4 system

modes (Heat, Cool,Auto, and Off), two fan modes (On and

Auto). It has dual temperature selection with

programmable start time capability.

The occupied cooling set point ranges between 45 and 98

º F. The heating set point ranges between 43 and 96ºF.

A liquid crystal display (LCD) displays zone temperature,

temperature set points, day of the week, time, and operational mode symbols.

The Option Menu is used to enable or disable applicable

functions, i.e.; Morning Warm-up, Economizer minimum position override during unoccupied status, Fahrenheit or Centigrade, Supply air tempering, Remote zone temperature sensor, 12/24 hour time display, Smart fan, and Computed recovery.

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

Status Inputs (4 Wires Optional)

The ZSM can be wired to receive four (4) operating status

signals from the RTRM (HEAT, COOL, SYSTEM “ON”, SERVICE).

Four (4) wires from the RTRM should be connected to the appropriate terminals (7, 8,9&10)ontheZSM.

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™ building management

system.

Remote Zone Sensor (BAYSENS074*)

This electronic sensor features single setpoint capability

and timed override with override cancellation. It is used with aTrane Integrated Comfort™ building management system.

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). Wiring proceduresvary according to the particular application and equipment involved. Refer to the unit’s wiring diagrams for proper connections.

Remote Zone Sensor (BAYSENS077*)

This electronic sensor can be used with BAYSENS106*,

108*, 110*, 119* Remote Panels.When this sensor is wired to a BAYSENS119* Remote Panel, wiring must be 18 AWG ShieldedTwisted Pair (Belden 8760 or equivalent). Refer to the specific Remote Panel for wiring details.

Wireless Zone Sensor (BAYSENS050*)

This electronic sensor features five system settings (Auto,

Off, Cool, Heat, and Emergency Heat) and with On and

Auto fan settings. It is amanual or auto changeover control

with dual setpoint capability. Other features include a timed override function, lockable system settings, and Fahrenheit or Celsius temperature display. Included with the wireless zone sensor will be a receiver that is to be mounted inside the unit, a mounting bracket, and a wire harness.

Electromechanical Control

The unit must have a thermostat to operate.

•BAYSTAT151

• Single Stage - 1 Heat/1 Cool

•BAYSTAT155

• Multi Stage - 3 Heat/2 Cool - Can be Used for

Economizer Operation

• BAYSENS150

• Multi stage - 3 Heat/2 Cool Programmable

Thermostat

High Temperature Sensor (BAYFRST001*)

This sensor connects to the RTRM Emergency Stop Input

on the LTB andprovides high limit “shutdown” of the unit.

The sensor is used to detect high temperatures due to a

high thermal event 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 135ºF. The supply air duct sensor (X1310004002) is set to open at 240ºF. The control can be reset after the temperature has been lowered approximately 25ºF below the cutout setpoint.

Evaporator Frost Control

ReliaTel™ Option

This input incorporates the Frostat™ control (FOS)

mounted in the indoor coil circuit and can be activated by

14 RT-SVX21U-EN

Page 15

General Information

closing a field supplied contact installed in parallel with the FOS.

If this circuit is closed before thecompressor is started, the compressor will not be allowed to operate. Anytime this circuit is closed for 1 continuous second during compressor operation, the compressor for that circuit is immediately turned “Off”. The compressor will not be allowed to restart for a minimum of 3 minutes should the FOS open.

Frostat is standard on multi-speed indoor motors and single zone VAV products (SZVAV).

Electromechanical Option

This input incorporates the Frostat™ control (FOS)

mounted in the indoor coil circuit or on suction line before equalizer port ofTXV and can be activated by opening a field supplied contact installed in series with the FOS.

If this circuit is open before the compressor is started, the compressor will not be allowed to operate. Anytime this circuit is opened during compressor operation, the compressor for that circuit is immediately turned “Off”.The compressor will restart when the FOS closes. Frostat™ is standard onYSC033G-063G electromechanical control products.

Discharge Line Temp Switch (DLTS)

The DLTS is looped in series with HPC and LPC. It prevents

compressor from overheating (over 300 Fº dome temp) in case of indoor fan failure (cooling) or outdoor fan failure (heating).

Smoke Detector Sensor (Optional)

This sensor provideshigh limit“shutdown” of theunit and

requires a manual reset.The sensor is used to detect smoke in the air conditioning or ventilation ducts.

Notes:

• The supply air smoke detector samples supply air.The

return and plenum air smoke detectors sample return air.The smoke detectors are designed to shut off the unit if smoke is sensed.This function is performed by sampling the airflow entering the unit at the return air opening. Follow the instructions provided below to assure that the airflow through the unit is sufficient for adequate sampling. Failure to follow these instructions will prevent the smoke detectors from performing its design function.

• Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

• Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning

these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

In order for the supply air smoke detector or return air smoke detector to properly sense smoke in the supply air stream or return air stream, the air velocity entering the smoke detector unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will develop an airflow velocity that falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

Phase Monitor

This sensor monitors voltage between the 3 conductors of

the 3 phase power supply.Two LED lights are provided:

• The green light indicates that a balanced 3 phase supply circuit is properly connected.

• The red light indicates that unit operation has been prevented.There are two conditions that will prevent unit operation:

• The power supply circuit is not balanced with the

proper phase sequence of L1, L2, L3 for the 3 conductors of a 3 phase circuit.

• The line to line voltage isnot between 180 volts and

633 volts.

Single Zone Variable Air Volume / Displacement Ventilation (Optional)

This sensor offers full supply fan modulation across the

available airflow range. In addition to full supply fan modulation, the unit controls the discharge air temperature to a varying discharge air temperature setpoint in order to maintain SpaceTemperature.

Human Interface - 5 Inch Color

Touchscreen (Optional)

The 5 inchColorTouchscreenHuman Interface provides an

intuitive user interface to the rooftop unit that speeds up unit commissioning, shortens unit troubleshooting times, and enhances preventative maintenance measures.The human interface includes several features including:

• Data trending capabilities by means of time series graphs

• Historical alarm messages

• Real-time sensor measurements

• On board system setpoints

• USB port that enables the downloading of component runtime information as well as trended historical sensor data

• Customized reports

RT-SVX21U-EN 15

Page 16

Unit Dimensions

Figure 1, p. 16 illustrates the minimum operating and

service clearances for either a single or multiple unit installation.These clearances are the minimum distances necessary to assure adequate serviceability, cataloged

Providing less than the recommended clearances may result in condenser coil starvation, “short-circuiting” of exhaust and economizer airflows, or recirculation of hot condenser air.

unit capacity, and peak operating efficiency.

Figure 1. Typical installation clearances for single & multiple unit applications

Side by Side Note 2

Notes:

1. For horizontal discharge unit, this measurement is reduced to 1’6” (457 MM) to minimize duct extensions.

2. When equipped with economizer or barometric relief damper, clearance distance is to be measured from protruding hood instead of base.

3. Clearance is the same if any unit is rotated 180°.

4. Addition clearance required when barometric damper or economizer is installed.

7’0” 2134 MM

3’0” 914 MM

Note 1

Single Unit

6’0” 1829 MM

End to End Note 2, 3

3’0” 914 MM

4’0” 1219 MM

Note 4

12 1/2”

9 1/8” 232 MM

318 MM

YSC033-063G & YHC036, YHC037E Units

12” 305 MM

YSC072-120F, YHC048-120F, YHC047-067E Units

16 3/4” 426 MM

16 RT-SVX21U-EN

Page 17

Figure 2. 3 to 5 tons standard efficiency

Notes:

1. All dimensions are in inches/millimeters.

2. ½ NPT Gas Connection

EVAPORATOR SECTION

ACCESS PANEL

4 1/4”

108 MM

ALTERNATE

CONDENSATE DRAIN

3/4 - 14 NPT DIA. HOLE

23 9/16”

598 MM

69 7/8”

1749 MM

1/2 NPT GAS CONNECTION

42 1/4”

1073 MM

5 5/8”

143 MM

9 5/8”

244 MM

20 1/4”

514 MM

TOP PANEL

4 1/4”

108 MM

5 9/16”

141 MM

7 5/8”

194 MM

44 1/4”

1124 MM

CONDENSER FAN

40 7/8”

1038 MM

UNIT CONTROL WIRE

7/8” (22 MM) DIA. HOLE SERVICE GAUGE PORT ACCESS

1 3/8” (35 MM) DIA. HOLE

UNIT CONTROL WIRE

2” (51 MM) DIA. HOLE

Unit Dimensions

CONDENSER COIL

Figure 3. 3 ton high efficiency

Notes:

1. All dimensions are in inches/millimeters.

2. ½ NPT Gas Connection

CONTROL AND COMPRESSOR ACCESS PANEL

RT-SVX21U-EN 17

Page 18

Unit Dimensions

44 MMMM

1038 MMMM

1053 MMMM

Figure 4. 3-5 ton standard efficiency, 3 ton high efficiency - roof curb

Note: All dimensions are in inches/millimeters.

8 3/8”

213 MM

1038

1053

Figure 5. 3-5 ton standard efficiency, 3 ton high efficiency - unit clearance and roof opening

Note: All dimensions are in inches/millimeters.

CLEARANCE 36” (914 MM)

18 RT-SVX21U-EN

Page 19

Figure 6. 6, 7½ (single) ton standard efficiency, 4-5 ton high efficiency

Note: All dimensions are in inches/millimeters.

Unit Dimensions

Figure 7. 6, 7½ (single) ton standard efficiency, 4-5 ton high efficiency - roof curb

Note: All dimensions are in inches/millimeters.

(356 MM)

(2130 MM)

RT-SVX21U-EN 19

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Unit Dimensions

Figure 8. 6, 7½ (single) ton standard efficiency, 4-5 ton high efficiency - unit clearance and roof opening

Note: All dimensions are in inches/millimeters.

Figure 9. 7½ ton (dual) - 10 ton standard efficiency,6-8½(MCHE) ton high efficiency, 6 ton dehumidification

Note: All dimensions are in inches/millimeters.

(TC MODELS)

2” ELECTRICAL CONNECTION

(SINGLE POINT POWER WHEN HEAT INSTALLED)

1/2 NPT GAS CONNECTION

(80 mbh, 120 mbh)

3/4 NPT GAS CONNECTION

(150 mbh, 200 mbh, 250 mbh)

(YC MODELS)

20 RT-SVX21U-EN

Page 21

Unit Dimensions

Figure 10. 7½ ton (dual) - 10 ton standard efficiency,6-8½(MCHE) ton high efficiency, 6 ton dehumidification

roof curb

Note: All dimensions are in inches/millimeters.

(356 MM)

(2130 MM)

Figure 11. 7½ ton (dual) - 10 tons standard efficiency,6-8½(MCHE) ton high efficiency, 6 ton dehumidification

unit clearance and roof opening

Note: All dimensions are in inches/millimeters.

RT-SVX21U-EN 21

Page 22

Unit Dimensions

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

Figure 12. 10 ton high efficiency

Notes:

1. All dimensions are in inches/millimeters.

2. ½ or ¾ NPT Gas Connection

UNIT CONTROL WIRE 7/8”

22MM

DIA HOLE

CONTROL BOX SECTION

ACCESS PANEL

EVAPORATOR SECTION

ACCESS PANEL

ALTERNATE CONDENSATE DRAIN CONNECTION 3/4-14 NPT DIA.HO LE

INDOOR TOP PANEL

OUTDOOR TOP PANEL

50 7/8” 1292 MM

27 5/8”

701 MM

47 7/8”

1216 MM

99 11/16” 2532 MM

1/2 NPT GAS CONNECTION

˄80 mbh, 120mbh˅;

3/4 NPT GAS CONNECTION

150mbh, 200mbh, 250mbh

or 2” ELECTRICAL CONNECTION (SINGLE POINT POWER WHEN HEAT INSTALLED)

UNIT POWER WIRE

DIA. HOLE

35MM

1 3/8”

SERVICE GAUGE PORT ACCESS 1 3/8” (35MM) DIA. HOLE

Figure 13. 10 ton high efficiency - roof curb

Notes:

1. All dimensions are in inches/millimeters.

34 3/8”

(873 MM)

14”

356 MM

13/4”

44 MM

56 3/8”

(1432 MM)

25 MM

1”

COMPRESSOR ACCESS PANEL

18 1/2”

(470 MM)

63 3/16”

1605 MM

CLEARANCE36”(914MM) FOR DOWNFLOW

CLEARANCE 18” (457 MM) FOR HORIZONTAL

65/8”

168 MM

1”

25 MM

34 3/8”

(873 MM)

18 1/2”

(470 MM)

1”

25 MM

(2130 MM)

83 7/8”

(2045 MM)

CONDENSER COIL

80 1/2”

59 7/8”

1521 MM

84 1/2”

(2146 MM)

2”

51 MM

2”

60 3/8”

(1534 MM)

22 RT-SVX21U-EN

Page 23

Figure 14. 10 ton high efficiency- unit clearance and roof opening

Notes:

1. All dimensions are in inches/millimeters.

99 11/16”

(2532 MM)

Unit Dimensions

63 3/16”

(1605 MM)

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Installation

Pre-Installation

WARNING

Fiberglass Wool!

Exposition to glass wool fibers without all necessary PPE equipment could result in cancer, respiratory, skin or eye irritation, which could result in death or serious injury. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation.You MUST wear all necessary Personal Protective Equipment (PPE) including gloves, eye protection, a NIOSH approved dust/mist respirator, long sleeves and pants when working with products containing fiberglass wool.

Precautionary Measures

• Avoid breathing fiberglass dust.

• Use a NIOSH approved dust/mist respirator.

• Avoid contact with the skinor 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.

WARNING

Improper Unit Lift!

Failure to properly lift unit could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Test lift unit approximately 24 inches to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level.

Figure 15. Corner weights

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.

Procedure

WARNING

Heavy Objects!

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

24 RT-SVX21U-EN

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Installation

Table 1. Maximum unit & corner weights (lbs) and center of gravity dimensions (in.) - gas/electric models

Unit

Maximum Model

Weights

(a)

Corner Weights

(b)

Center of Gravity (in.)

Tons Model No. Shipping Net A B C D Length Width

3 YSC033G 577 472 193 178 45 55 33 9 3 YSC036G 577 472 193 178 45 55 33 9 4 YSC043G 598 492 205 183 46 58 33 9 4 YSC048G 598 492 205 183 46 58 33 9 5 YSC060G 627 522 214 193 52 63 33 10 5 YSC063G 602 497 208 184 47 59 32 9

6 YSC072F 805 710 222 217 121 150 41 22 7½ YSC090F 862 767 243 221 155 149 45 21 7½ YSC092F 990 847 265 249 173 160 46 21 8½ YSC102F 1047 904 279 252 187 186 44 22

10 YSC120F 1156 1058 345 242 258 213 41 23

3 YHC036E 607 532 165 137 95 134 31 19

3 YHC037E 676 606 178 162 126 139 33 19

4 YHC048E/YHC047E 858 763 238 200 148 176 40 23

4 YHC048F 806 711 226 199 144 143 44 22

5 YHC060E/YHC067E 917 822 261 218 156 187 40 22

5 YHC060F 850 755 239 214 152 151 44 21

6 YHC072E 1025 927 296 198 205 228 41 24

6 YHC072F 965 822 250 245 174 153 47 21

6 YHC074F 1114 1016 334 231 248 202 41 23 7½ YHC092F 1124 1026 340 233 249 204 41 23 8½ YHC102F 1133 1035 341 236 253 205 49 23

10 YHC120F 1453 1259 356 371 289 242 54 27

(a)Weights are approximate. (b)Corner weights are given for information only.

Figure 16. Rigging and center of gravity

RT-SVX21U-EN 25

Page 26

Installation

Table 2. Factory installed options (fiops)/accessory net weights (lbs)

YSC033G-063G YSC036G-060G

YHC036E, YHC037E

Net Weight Net Weight Net Weight Net Weight Net Weight

Accessory 3 to 5 Tons 4 to 5 Tons 6 to 8½ Tons 6, 7½, 8½, 10 10

Barometric Relief 7 10 10 10 10 Belt Drive Option (3 phase only) 31 31 — — — Coil Guards 12 20 20 20 30 Economizer 26 36 36 36 36 Hinged Doors 10 12 12 12 12 Low Leak Economizer 68 93 93 93 93 Manual Outside Air Damper 16 26 26 26 26 Motorized Outside Air Damper 20 30 30 30 30 Novar Control 8 8 8 8 8 Oversized Motor 5 8 8 — — Powered Convenience Outlet 38 38 38 38 50 Powered Exhaust 40 40 80 80 80 Reheat Coil 12 Roof Curb 61 78 78 78 89 Smoke Detector, Supply 5 5 5 5 5 Smoke Detector, Return 7 7 7 7 7 Stainless Steel Heat Exchanger Through-the-Base Electrical 8 13 13 13 13 Through-the-Base Gas 5 5 5 5 5 Unit Mounted Circuit Breaker 5 5 5 5 5 Unit Mounted Disconnect 5 5 5 5 5 460V/575V

(a)Weights for options not listed are <5 lbs. (b)Net weight should be added to unit weight when ordering factory-installed accessories. (c) Reheat weight here is only applicable to YHC036E models. (d)Reheat weight for this value only applicable to 7.5 and 8.5 Ton High Efficiency “F” models. (e) Applicable to Gas/Electric units only. (f) Apply weight with all 460V and 575V 17 Plus Two-Stage Cooling units.

(f)

(e)

(c)

46666

29 29 — — —

YHC047E-067E YHC048E-060E YHC048F-060F

14 15 20

(a),(b)

YSC072F-102F

YHC072E/F

YSC120F

YHC074F-102F YHC120F

(d)

Foundation

WARNING

Horizontal Units

If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at each support location with a“full perimeter” support structure or a slab foundation for support. Refer to Table 1, p. 25 for the unit’s operating and point loading weights when constructing a footing foundation.

If anchoring is required, anchor the unit to the slab using hold down bolts or isolators. Isolators should be installed to minimize the transmission of vibrations into the building.

26 RT-SVX21U-EN

Risk of Roof Collapsing!

Failure to ensure proper structural roof support could cause the roof to collapse, which could result in death or serious injury and property damage. Confirm with a structural engineer that the roof structure is strong enough to support the combined weight of the roofcurb and the unit. Refer to 'Weights' page, Table 1,

p. 25 for typical unit and curb weights.

For rooftop applications, ensure the roof is strong enough to support the combined unit and support structural weight. Refer to Table 1, p. 25 for the unit operating weights. If anchoring is required, anchor the unit to the roof with hold-down bolts or isolators.

Check with a roofing contractor for proper waterproofing procedures.

Page 27

Installation

Ductwork

Figure 17, p. 27 to Figure 19, p. 27 illustrate the supply and

return air openings as viewed from the rear of the unit.

Figure 17. 3-5 ton standard efficiency units & 3 ton high

efficiency units - Horizontal supply & return air openings

Figure 18. 4-6 ton high efficiency units, 6(074)-8½

(Microchannel) high efficiency unit and 6-10 ton standard efficiency units - horizontal supply & return air openings

Figure 20, p. 27 to Figure 22, p. 28 illustrate the supply and

return air openings in a downflow configuration.

Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and toreduce static pressure.

When attaching the ductwork to the unit, provide a water

tight flexible connector at the unit to prevent operating sounds from transmitting through the ductwork.

All outdoor ductwork between the unit and the structure

should be weather proofed after installation is completed.

Figure 20. 3-5 ton standard efficiency units&3tonhigh

efficiency units - Down flow supply & return air openings w/ through-the-base utilities

3 5/8”

92 MM

102 MM

610 MM

4”

24”

4 3/16”

106 MM

RETURN

14”

356 MM

23 1/2”

597 MM

9 1/4”

235 MM

457 MM

TBU CONDENSATE

THE BASE GAS

15 1/2”

394 MM

SUPPLY

18”

4 9/16”

116 MM

THROUGH

27 9/16” 701 MM

THROUGH THE BASE

ELECTRICAL

4 7/8”

124 MM

9 15/16” 253 MM

5 1/16”

128 MM

2 13/16”

71 MM

3 11/16”

94 MM

6 1/2”

165 MM

Return

Supply

Figure 19. 10 ton high efficiency unit - horizontal supply

& return air openings

3 7/8” 98 MM

9 3/8”

238 MM

32 1/4”

Return

832 MM

16 3/4”

425 MM

27 5/8” 701 MM

4 3/4”

120 MM

4 1/4”

108 MM

32 1/4” 832 MM

Supply 19 1/4”

489 MM

3/4-14 NPT DIA. HOLE CONDENSATE DRAIN

Figure 21. 4-6 ton high efficiency units, 6(074)-8½

(Microchannel) high efficiency units and 6-10 ton standard efficiency units - down flow supply & return air openings w/ through-thebase utilities

RT-SVX21U-EN 27

Page 28

Installation

838

Figure 22. 10 ton high efficiency unit - downflow supply

& return air openings w/ through-the-base

32 1/8”

816 MM

17 1/2”

444 MM

utilities

Return

27 5/8”

701 MM

9 7/8”

251 MM

17 1/2”

444 MM

Supply

THROUGH THE

BASE ELECTRICAL

THROUGH THE

BASE CONDENSATE

119 MM

33”

4 5/8”

2 3/4” 71 MM

6 3/8”

163 MM

5 7/8”

149 MM

51 13/16” 1316 MM

42 3/16”

1072 MM

4”

102 MM

4 1/8”

104 MM

3 5/8”

92 MM

Roof Curb

Downflow

The roof curbs for these unitsconsists of a“full perimeter”

enclosure to support the unit just inside of the unit base rail.The 10 ton high efficiency units contain a support base alignment rail and will extend pastthe end ofthe roofcurb as shown in figures below.

Before installing any roof curb, verify;

• It is the correct curb for the unit,

• It includes the necessary gaskets and hardware,

• The installation location provides the required clearance for proper operation,

• The curb is level and square. The top surface of the curb must be true to assure an adequate curb-to-unit seal.

instructions carefully to assure proper fit-up whenthe unit is set into place.

Note: To assure proper condensate flow during

operation, as well as proper operation of the condensate overflow switch (if equipped), the unit and curb must be level.

If the unit is elevated, a field constructed catwalk around the unit is strongly recommended to provide easy access for unit maintenance and service.

Recommendations for installingthe Supply Air and Return

Air ductwork joining the roof curb are included in the curb

instruction booklet. Curb ductwork must befabricated and installed by the installing contractor before the unit is set into place.

Note: For sound consideration, cut only the holes in the

roof deck for the ductwork penetrations. Do not cut out the entire roof deck within the curb perimeter.

Figure 23. View for base to roof curb alignment

YHC120F on 50" x 84" roof curb

Base Alignment Bracket

Figure 24. View for base to roof curb alignment

YHC120F on 60" x 84" roof curb

WARNING

Combustible Materials!

Failure to maintain proper clearance between the unit heat exchanger, vent surfaces and combustible materials could cause a fire which could result in death or serious injury or property damage. Refer to unit nameplate and installation instructions for proper clearances.

Verify that appropriate materials were used in the

construction of roof and ductwork.Combustible materials should not be used in the construction of ductwork or roof curb that is in close proximity to heater elements or any hot surface.Any combustible material on the inside of the unit base should be removed and replaced with appropriate material.

Step-by-step curb assembly and installation instructions ship with each accessory roof curb kit. Follow the

28 RT-SVX21U-EN

If a Curb Accessory Kit is not used:

• The ductwork can be attached directly to the factoryprovided flanges around the unit’s supply and return air openings. Be sure to use flexible duct connections at the unit.

• For “built-up” curbs supplied by others, gaskets must be installed around the curb perimeter flange and the supply and return air opening flanges.

Page 29

Installation

Rigging

WARNING

Heavy Objects!

A Rigging illustration and Center-of-Gravity dimensional

data table is shown in Figure 16, p. 25. Refer to the typical unit operating weights table before proceeding.

1. Remove all drill screws fastening wood protection to metal base rail. Remove all screws securing wooden protection to wooden top crate.

2. Remove WoodenTop Crate.

WARNING

Improper Unit Lift!

3. Rig the unit as shown in Figure 16, p. 25. Attach adequate strength lifting slings to all four lifting brackets in the unit base rail. Do not use cables, chains, or slings except as shown.

4. Install a lifting bar, as shown in Figure 16, p. 25,to protect the unit and to facilitate a uniform lift.The minimum distance between the lifting hook and the top of the unit should be 7 feet.

5. Test-lift the unit to ensure it is properly rigged and balanced, make any necessary rigging adjustments.

Figure 25. Fork pockets - all units except 10 ton high

efficiency units

Figure 26. Fork pockets - 10 ton high efficiency unit

NOTICE

6. Lift the unit enough to allow the removal of base fork pocket protection components as shown in the following figures.

7. When 10 ton high efficiency units are installed on smaller existing roof curb (50"x 84") for replacement applications, do not remove alignment bracket.This bracket helps assure proper alignment of duct openings.

8. Downflow units; align the base rail of the unit with the curb rail while lowering the unit onto the curb. Make sure that the gasket on the curb is not damaged while positioning the unit.

General Unit Requirements

The checklist listed below is a summary of the steps

required to successfully install a commercial unit.This checklist is intended to acquaint the installing personnel with what isrequired in the installationprocess. It does not replace the detailed instructions called out in the applicable sections of this manual.

• Check the unit for shipping damage and material shortage; file a freight claim and notify appropriate sales representative.

RT-SVX21U-EN 29

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Installation

• Verify correct model, options and voltage from unit nameplate.

• Verify that the installation location of the unit will provide the required clearance for proper operation.

• Assembleand install the roof curb (if applicable). Refer to the latest edition of the curb installers guide that ships with each curb kit.

• Fabricate and install ductwork; secure ductwork to curb.

• Install pitch pocket for power supply through building roof. (If applicable)

• Rigging the unit.

• Set the unit onto the curb; check for levelness.

• Ensure unit-to-curb seal istight and without buckles or cracks.

• Install and connect a condensate drain line to the evaporator drain connection.

Note: Condensate Overflow Switch (if equipped) will not

work if unit is not leveled properly.

Factory Installed Economizer

• Ensure the economizer has been pulled out into the operating position. Refer to the economizer installation guide for proper position and setup.

• Install all access panels.

Temperature Limit Switch Usage for Gas

Heat Units

Units are factory shipped in the down flow discharge configuration but can be field converted to a horizontal discharge configuration. Some, but not all units require a differentTCO1 limit switch, which is attached to the combustion blower motor if horizontal discharge configuration is used.

Note: See Table 5, p. 31 for horizontal discharge

requirements.

If any of the units in Table 5, p. 31 are installed in the down flow discharge configuration and have the alternateTCO1 limit switch provided, remove the additionalTCO1 limit switch from the combustion blower motor and discard.

Table 3. TC01 tripping values

Unit Model - 6 to 10 Ton

Standard Efficiency

YSC072F**(M,Y) 155F/170F

YSC072F**(L,X) 170F

YSC072F**(H,Z) 145F/155F

YSC090F**(L,X) 180F/200F YSC090F**(M,Y) 155F YSC090F**(H,Z) 155F

YSC092F**(L,X) 225F YSC092F**(M,Y) 230F

TCO1 Tripping Values -

Downflow/ Horizontal

Table 3. TC01 tripping values (continued)

Unit Model - 6 to 10 Ton

Standard Efficiency

YSC092F**(H,Z) 220F/260F YSC102F**(L,X) 225F YSC102F**(M,Y) 230F YSC102F**(H,Z) 200F/260F YSC120F**(L,X) 180F/200F YSC120F**(M,Y) 200F YSC120F**(H,Z) 190F/260F

Table 4. TC01 tripping values

Unit Model - High Efficiency

YHC048E/F(3,4,W)*(L,X)-DD

YHC048E/F(3,4,W)*(M,Y)-DD

YHC048E/F(3,4,W)*(H,Z)-DD

YHC060E/F(3,4,W)*(L,X)-DD

YHC060E/F(3,4,W)*(M,Y)-DD

YHC060E/F(3,4,W)*(H,Z)-DD

15 SEER

YHC036E**(L,X)-DD 180F

YHC036E**(L,X)-BD 170F

YHC036E1*(M,Y)-DD

YHC036E(3,4,W)*(M,Y)-DD

YHC036E**(M,Y)-BD 180F/190F YHC036E1*(H,Z)-DD

YHC036E(3,4,W)*(H,Z)-DD

YHC036E**(H,Z)-BD 155F/190F

YHC048F1*(L,X)-DD

YHC048E/F**(L,X)-BD 155F

YHC048F1*(M,Y)-DD

YHC048E/F**(M,Y)-BD 170F/180F

YHC048F1*(H,Z)-DD

YHC048E/F**(H,Z)-BD 220F/260F

YHC060F1*(L,X)-DD

YHC060E/F**(L,X)-BD 155F/145F

YHC060F1*(M,Y)-DD

YHC060E/F**(M,Y)-BD 170F

YHC060F1*(H,Z)-DD

YHC060E/F**(H,Z)-BD 220F/230F

YHC072E/F**(L,X) 200F YHC072E/F**(M,Y) 220F YHC072E/F**(H,Z) 210F

YHC074F**(L,X) 155F YHC074F**(M,Y) 180F/190F YHC074F**(H,Z) 200F/220F

YHC092F**(L,X) 190F YHC092F**(M,Y) 180F/200F YHC092F**(H,Z) 200F

YHC102F**(L,X) 190F YHC102F**(M,Y) 180F/200F YHC102F**(H,Z) 200F

YHC120F**(L,X) 135F YHC120F**(M,Y) 170F

TCO1 Tripping Values -

Downflow/ Horizontal

(a),(b)

TCO1 Tripping Values -

Downflow/ Horizontal

190F

170F/190F

190F/220F

170F/190F

170F/155F

145F/155F

140F

150F/170F

180F/200F

140F/150F 145F/170F

190F/220F

220F

155F 140F

180F

30 RT-SVX21U-EN

Page 31

Installation

Table 4. TC01 tripping values

Unit Model - High Efficiency

(a)BD= Belt drive ID motor (b)DD= Direct drive ID motor

15 SEER

YHC120F**(H,Z) 145F/190F

(a),(b)

(continued)

TCO1 Tripping Values -

Downflow/ Horizontal

Table 5. TC01 tripping values

Unit Model - High Efficiency

17 Plus

YHC037**(L,X) 190F YHC037**(M,Y) 170F/220F YHC037**(H,Z) 220F

YHC047**(L,X) 145F/155F YHC047**(M,Y) 170F YHC047**(H,Z) 220F

YHC067**(L,X) 140F YHC067**(M,Y) 170F YHC067**(H,Z) 170F

TCO1 Tripping Values -

Downflow/ Horizontal

Table 6. TC01 tripping values

Unit Model - 3 to 5 Ton

Standard Efficiency - MCHE

YSC033-036G**(L,X) 155F YSC033-036G**(M,Y) 190F YSC033-036G**(H,Z) 190F / 210F

YSC043-048G**(L,X) 155F YSC043-048G**(M,Y) 180F / 200F YSC043-048G**(H,Z) 190F / 230F

YSC060-063G**(L,X) 155F YSC060-063G**(M,Y) 170F YSC060-063G**(H,Z) 170F / 225F

TCO1 Tripping Values -

Downflow/ Horizontal

Horizontal Discharge Conversion (3 to 5 Ton Units)

Note: 3 to 5 ton units supply cover to supply opening and

return cover to return opening.

Supplies needed by installer for conversion: 3 oz. tube of high temperature RTV sealant. (500°F / 260°C: similar to Dow Corning 736)

Important: Failure to use recommended sealant could

result in unit performance loss.

If a unit is to be converted to a horizontal discharge, the following conversion must be performed:

1. Remove RETURN and SUPPLY duct covers.

2. Locate supply cover. Apply ¼ in. (6mm.) continuous bead of 500°F RTV sealant to the flange as shown.

Figure 27. Duct cover

RTV Sealant

3. Position duct cover as shown, rotate 90 degrees to allow entrance into supply opening.

4. Slide duct covers into duct openings until inward edge of duct cover engages with the 2 retaining clips on the duct flanges. Secure the outward edge of each duct cover with 2 screws.

5. Slide RETURN DUCT COVER (insulation side up) into supply opening until inward edge of duct cover engages with the 2 retaining clips on the duct flange. Secure outward edge of the duct cover with two screws.

6. After completing installation of the duct covers for horizontal discharge, proceed toTCO1 instructions.

TCO1 Instructions

If the unit being installed is listed in Table 5, p. 31 with a differentTCO1 value, the limit control TCO1 must be replaced with the extra limit control shipped in the heater compartment. ReplaceTCO1 following the instructions in steps 1 through3 below. If theunit being installed doesnot correspond to any in thefollowing list, skipsteps 1 through 3 and go on to next step in the installation process.

Figure 28. TCO1 location (YHC036E, YHC037E, and

YSC033-063G)

Location of TC01 limit for YSC048G, YSC060G, YHC036E and YHC037E units

Flame Rollout Limit

Location of TC01 limit YSC033-063G

RT-SVX21U-EN 31

Page 32

Installation

WARNING

Hazardous Voltage!

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

1. Remove the heat section access panel.

2. RemoveTCO1 from shipping location, attached to the combustion blower.

3. Replace and discard the existingTCO1 originally installed at the factory for down flow operation with theTCO1 shipped attached to the combustion blower for horizontal operation.

4. Replace heat section access panel.

Horizontal Discharge Conversion (6 to 10Ton Units)

Note: 6 to 10 ton units the supply cover to return opening

& return cover to supply opening.

Supplies Needed by Installer for Conversion: 3 oz. tube of highTemperature RTV sealant (500°F / 260°C: Similar to Dow Corning 736).

Important: Failure to use recommended sealant could

result in unit performance loss.

If a unit is to be converted to a Horizontal discharge, the following conversion must be performed:

1. Remove RETURN and SUPPLY duct covers.

2. Place SUPPLY DUCT COVER over down-flow return opening. (insulation side down)

3. Using self-drilling screws, (or screws removed from duct cover), screw through dimples to attach DUCT COVER to base.

Figure 30. Duct cover

RTV Sealant

Note: If unit is equipped with Return Air Smoke Detector,

refer to field conversion instructions for horizontal discharge before installing return air duct.

Note: If unit is equipped with Discharge Air Sensing

option refer to the following figure for proper tube positioning based on unit tonnage.

Figure 31. For YSC120F*R and YHC074F, 092F, 102F

models

Downow application

Horizontal application

Figure 29. Duct cover

Supply Duct Cover

Screw into 4 dimples on top edge

4. On original RETURN DUCT COVER, apply ¼”(6mm.) continuous bead of 500°F RTV sealant around flange (opposite insulation side), as shown.

32 RT-SVX21U-EN

6. After completing installation of the duct covers for horizontal discharge, proceed toTCO1 instructions.

Figure 32. Supply and return covers

Supply duct cover

Insulation side down

Insulation side up

Return duct cover

Page 33

Installation

TCO1 Instructions

If the unit being installed is listed in the following list, the limit controlTCO1 must be replaced with the extra limit control shipped in the heater compartment. ReplaceTCO1 following the instructions in steps 1 through3 below. If the unit being installed does not correspond to any in the following list, skip steps1 through 3 and go on to next step in the installation process.

Unit Model Number

YSC072F**(H,Z),YSC092F**(M,Y),YSC092F**(H,Z), YSC102F**(M,Y),YSC102F**(H,Z),YSC120F**(L,X), YSC120F**(H,Z),YSC090F**(L,X),YHC074F**(M,Y), YHC074F**(H,Z),YHC092F**(M,Y), YHC102F**(M,Y), YHC120F**(L,X),YHC120F**(H,Z).

WARNING

Hazardous Voltage!

1. Remove the heat section access panel.

2. RemoveTCO1 from shipping location, attached to the combustion blower.

3. Replace and discard the existingTCO1 originally installed at the factory for down flow operation with theTCO1 shipped attached to the combustion blower for horizontal operation.

4. Replace heat section access panel.

If a unit is to be converted to horizontal discharge, the following conversion must be performed:

1. If the unit has an economizer, it must be pulled out in the operating position.

2. Remove the 3 screws from the mounting brackets. Refer to downflow view for screws locations.

Figure 34. Downflow view

3. Lift the tube and bracket from the downflow duct opening. Rotate the tube and bracket assembly 180 degrees ensuring that the holes on the copper sensing tube face away from the unit and face the return air ductwork. Refer Figure 35, p. 33 and Figure 36, p. 34 for screws location.

Figure 35. Horizontal view 1

Figure 33. TCO1 location (YHC120F)

TCO1 limit is located above the burner on the YHC120F models

Replace original factory installed TCO1 with optional TCO1 attached to blower housing for field convertion to horizontal discharge

Return Air Smoke Detector

The factory installed Return Air Smoke Detector is

installed in the downflow discharge position. No additional field setup is required.

RT-SVX21U-EN 33

Page 34

Installation

Figure 36. Horizontal view 2

2. Remove the screw from the mounting bracket. Refer to downflow view for screw and bracket location.

Figure 37. Wireless communication interface -

downflow

3. Mount thebracket in the horizontal discharge location. Refer to horizontal view for screw and bracket location.

Figure 38. Wireless communication interface -

horizontal

Note: Check to insure that the flexible tubing lies flat on

the base pan surface.

4. Slide the top bracket down the copper sensing tube. ForYSC036G-060, andYHC036-037E units insert the tab on the left side into the slot on the indoor coil block off and secure the right side of the bracket with one of the 3 screws removed in step 2. Refer to Figure 35,

p. 33. ForYHC047E-067E,YHC048E/F-060E/F,YSC072F-

120F andYHC(072E/F, 074F-120F) units secure the tab on left side to the indoor coil block off with one of the screws removed in step 2 and secure the right side of the bracket with one of the screws removed from the access panel. Refer to Figure 36, p. 34.

5. Using the remaining 2 screws removed in step 2, secure the bottom bracket. Refer to Figure 35, p. 33.

Note: Larger diameter holes on bottom bracket line up

with the dimples on the rear panel.The smaller diameter holes line up with the screw holes in the rear panel.

Air-Fi™ Wireless Communication

Interface

The factory installed wireless communications interfaceis

installed in the downflow discharge position.

If a unit is to be converted to horizontal discharge, the following conversion must be performed:

1. If the unit has an economizer, it must be pulled out in the operating position.

Note: Cable ties must be removed to allow the cable to

extend to the horizontal mounting location.

Main Electrical Power Requirements

WARNING

Hazardous Voltage w/Capacitors!

Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with an appropriate voltmeter that all capacitors have discharged.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

34 RT-SVX21U-EN

Page 35

Installation

WARNING

Proper Field Wiring and Grounding Required!

Verify that the power supply complies 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 switch and to the main power terminal block(HTB1) in the unit control panel.

• Install proper grounding wires to an earth ground.

Through-the-Base Gas

Installation

The gas supply line must extend 4⅝” above the base pan.

The “Through-the-Base Gas” kit is located in the heat

vestibule compartment.To gain access to the kit, remove the Heat Compartment access panel.

1. Remove the pipe assembly strapped to the manifold. Unscrew 90° elbow from 6½” nipple and slide rubber grommet off of nipple.

2. Remove the plastic plug from the hole in the center post and insert the grommet removed from 6½” pipe nipple.

3. Using pipe sealant, attach the 90° elbow to the gas supply line.

4. Disconnect the 5" pipe nipple and union from the “Through-the-Base Gas” kit assembly.

5. Using pipe sealant, attach the 6½” nipple and gas shutoff assembly to the 90° elbow on the gas supply line.

6. Using pipe sealant, attach the 5" pipe nipple and union to the street el attached to the gas valve.

7. Connect 5" pipe nipple and union to 6½” nipple and gas shutoff assembly.

Figure 39. Typical through-the-base gas installation

Requirements for Gas Heat

Note: The unit gas train and optional through-the-base

gas shut-off valve are rated at 1/2 PSIG maximum. A pressure reducing regulator is recommended to prevent this maximum from being exceeded.

These components must be isolated during field

gas piping test that exceed 1/2 PSIG. It is recommended that the field piping be capped prior to the unit gas train or optional through-the-base gas shut-off valve if present.

• Gas supply line properly sized and connected to the unit gas train.

• All gas piping joints properly sealed.

• Gas piping leak checked with a soap solution. If piping connections to the unitare complete, do not pressurize piping in excess of 0.50 psig or 14" W.C. to prevent component failure.

• Drip leg Installed in the gas piping near the unit.

• Minimum gas supply pressure should be 4.5" W.C.

• Maximum gas supply pressure must not exceed 14.0"

W.C.

• Manifold pressure for single stage heaters should be set to 3.3" W.C.

• Manifold pressure for two stage heaters should be set to 3.5" W.C. on HIGH FIRE and 1.8" W.C. on LOW FIRE.

• Flue Exhaust clear of any obstruction.

RT-SVX21U-EN 35

Page 36

Installation

Condensate Drain Configuration

WARNING

Hazardous Voltage!

An evaporator condensate drain connection is provided

on each unit. Refer to Figure 17, p. 27 and Figure 18, p. 27 for the appropriate drain location.

The condensate drain pan is factory installed to drain

condensate to the backside of the unit. See Figure 17, p. 27 and Figure 18, p. 27. It can be converted to drain condensate out the front side of the unit or through-thebase.

To convert drain condensate out the front of

unit:

1. Remove evaporator accesspanel and supplyair access panels.

2. Remove the support panel that the condensate drain pan exits through.

3. Slide the condensate drain pan out of the unit and rotate 180°.

4. Slide the condensate drainpan back into the unit, align the drain with the grommeted opening in the rear support panel and push until the coupling is seated in the grommet.

5. Replace the front support panel by aligning the panel with tabs in the raceway. Align the condensate drain pan support in the grommeted hole as the panel is put in place.

6. Replace evaporator access panel and supply airaccess panels.

To convert drain condensate through-the base

of unit:

1. Remove evaporator accesspanel and supplyair access panels.

2. Remove the support panel that the condensate drain pan exits through.

3. Slide the condensate drain pan out of the unit.

4. Place on a level surface in the position it was removed from the unit.

5. Remove the plug knockout in the bottom of the drain pan to convert it to through-the-base drainage.

6. Plug the original condensate drain opening with a field supplied 3/4” NPT plug.

7. Slide thecondensate drainpan back into the unit, align the drain support with the grommeted opening in the rear support panel and push until the support is seated in the grommet.

8. Replace the front support panel by aligning the panel with tabs inthe raceway.Align the pluggedcondensate drain pan coupling in the grommeted hole as the panel is put in place.

9. Replace evaporator access panel and supply airaccess panels.

A condensate trap must be installed at the unit due to the

drain connection being on the“negative pressure” side of the fan. Install the P-Trap using the guidelines in Figure 40,

p. 36.

A condensate drain line must be connected to the p-trap.

Pitch the drain lines at least 1/2 inch for every 10 feet of horizontal run to assure proper condensate flow. Do not allow the horizontal run to sag causing a possible doubletrap condition which could result in condensate backup due to “air lock”.

Figure 40. Condensate trap installation

38.1

Drain Pan Removal (Units with Condensate Overflow Switch Option)

Before drain pan removal, the switch wire must be disconnected from wire tie on panel and/or any tape before drain pan can be removed.

Care must be taken so the wire does not catch on the bottom of indoor coil or any protrusion.

Note: When reversing the drain pan, on some units, the

condensate overflow switch will need to be moved to the second hole in its bracket to avoid contact with headers or indoor coil.

Filter Installation

The quantity of filters is determined by unit size.Access to

the filters is obtained by removing the filter access panel. Refer to the unit Service Facts (shipped with each unit) for filter requirements.

36 RT-SVX21U-EN

Page 37

Note: Do not operate the unit without filters.

Field Installed Power Wiring

WARNING

Proper Field Wiring and Grounding Required!

An overall dimensional layout forthe field installed wiring

entrance into the unit is illustrated in “Unit Dimensions,”

p. 16.To insure that the unit’s supply power wiring is

properly sized and installed, follow the following guidelines.

Verify that the power supply available is compatible with

the unit’s nameplate ratings.The available supply power must be within 10% of the rated voltage stamped on the nameplate. Use only copper conductors to connect the power supply to the unit.

NOTICE:

Use Copper Conductors Only!

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

Important: If the unit is not equipped with an optional

factory installed non-fused disconnect switch or circuit breaker, a field supplied disconnect switch must be installed at or near the unit in accordance with the National Electrical Code (NEC latest edition).

Main Unit Power

WARNING

Proper Field Wiring and Grounding Required!

Installation

WARNING

Hazardous Voltage!

Standard Wiring

1. Location ofthe applicableelectrical serviceentrance is illustrated in “Unit Dimensions,” p. 16. Complete the unit’s power wiring connections at Compressor Contactor # 1 (CC1) inside the unit control panel. Refer to the customer connection diagram that is shipped with the unit for specific termination points

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

Optional TBUE Wiring (Through-the-Base Electrical Option)

1. Location of the applicable electrical service is illustrated below. Refer to the customer connection diagram that is shipped with the unit for specific termination points.The termination points, depending on the customer option selected would be a factory mounted non-fused disconnect switch (UDC) or circuit breaker (UCB). If neither a factory mounted non-fused disconnect switch (UDC) or circuit breaker (UCB) was factory mounted, field wiring connections should be terminated in the controlbox at Compressor Contactor # 1 (CC1).

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

Note: Black Gasket is shipped from the factory and is

located in the literature ship-with bag in the control box.Apply BlackGasket around conduit plate on all 4 sides after installation to prevent air leakage from the building entering the electrical enclosures.

Note: Seal between wiring and conduit with Black Gasket

or weather proof sealer to prevent air leakage from the building entering the electrical enclosures. Also seal around conduit and wiring at all roof and curb penetrations.

RT-SVX21U-EN 37

Page 38

Installation

Figure 41. All units except 10 ton high efficiency units

Figure 42. 10 ton high efficiency units

WARNING

Proper Field Wiring and Grounding Required!

An overall layout of the various control options available

with the required number of conductors for each control device is illustrated in Figure 39, p. 35.

Note: All field wiring must conform to NEC guidelines as

well as state and local codes.

Control PowerTransformer

The 24 volt controlpower transformers are to be used only

with the accessories called out in this manual.

Transformers rated greater than 50VA are equipped with

internal circuit breakers. If a circuit breaker trips, turn “Off” all power to the unit before attempting to reset it.

WARNING

Hazardous Voltage!

The transformer is located in the control panel.The circuit

breaker is located on the left side of the transformer and

SEAL BETWEEN WIRING AND CONDUIT WITH WEATHER PROOF SEALER TO PREVENT AIR LEAKAGE

CONTROL WIRING CONDUIT

BLACK GASKET

FIELD POWERED CONVENIENCE OUTLET CONDUIT

CONTROL WIRING CONDUIT

Field-Installed Control Wiring

WARNING

Hazardous Voltage!

38 RT-SVX21U-EN

can be reset by pressing in on the black reset button.

Controls Using 24 VAC

Before installing any connecting wiring, refer to “Unit

Dimensions,” p. 16 for the electrical access locations

provided on the unit and Table 7, p. 39 or Table 8, p. 39 for

AC conductor sizing guidelines, and;

1. Use copper conductors unless otherwise specified.

2. Ensure that the AC controlwiring between the controls and the unit’s termination point does not exceed three (3) ohms/conductor for the length of the run.

NOTICE:

Controls Using 24 VAC!

Resistance in excess of 3 ohms per conductor could cause component failure due to insufficient AC voltage supply.

Note: Be sure to check all loads and conductors for

grounds, shorts, and mis-wiring.

Page 39

Installation

3. Do not run the AC low voltage wiring in the same conduit with the high voltage power wiring.

4. Route low voltage wiring per illustrations on page 41.

Table 7. Electromechanical thermostat 24V AC

conductors with ReliaTel™

Distance from Unit to Control Recommended Wire Size

000 - 460 feet 18 gauge 000 - 140 m .75 mm2 461 - 732 feet 16 gauge 141 - 223 m 1.3 mm2 733 - 1000 feet 14 gauge 224 - 305 m 2.0 mm2

Table 8. Electromechanical thermostat 24V AC

conductors with electromechanical unit

Distance from Unit to Control Recommended Wire Size

0 - 30 feet 22 gauge 0 - 9.1 m .33 m2 31 - 50 feet 20 gauge

9.5 - 15.2 m .50m2 51 - 75 feet 18 gauge

15.5 - 22.9 m .75 m2 76 - 125 feet 16 gauge

23.1 - 38.1 m 1.3 m2 126 - 200 feet 14 gauge

38.4 - 60.9 m 2.0 m2

DC Conductors

Table 9. Zone sensor module wiring

Distance from Unit to Control Recommended Wire Size

0 - 150 feet 22 gauge 0 - 45.7 m .33 mm2 151 - 240 feet 20 gauge 46 - 73.1 m .50 mm2 241 -385 feet 18 gauge

73.5 - 117.3 m .75 mm2 386 - 610 feet 16 gauge

117.7 - 185.9 m 1.3 mm2 611 - 970 feet 14 gauge

186.2 - 295.7 m 2.0 mm2

Figure 43. Typical field wiring diagrams for

electromechanical

Controls using DC Analog Input/Outputs (Standard Low Voltage Multi conductor Wire)

Before installing any connecting wiring between the unit and components utilizing a DC analog input\output signal, refer to “Unit Dimensions,” p. 16 for the electrical access locations provided on the unit.

• Table 9, p. 39 lists the conductor sizing guidelines that must be followed when interconnecting the DC binary output devices and the system components utilizing a DC analog input/output signal to the unit.

Note: Resistance in excess of 2.5 ohms per conductor can

cause deviations in the accuracy of the controls.

Note: Ensure that the wiring between controls and the

unit’s termination point does not exceed two and a half (2.5) ohms/conductor for the length of the run.

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

• Route low voltage wiring per illustrations on page 41.

RT-SVX21U-EN 39

Page 40

Installation

Figure 44. ReliaTel™ conventional thermostat field

wiring diagrams

(a)Not compatible with VAV units.

(a)

RTRM

Figure 45. ReliaTel™ options module (RTOM board)

Figure 47. ReliaTel™ humidistat (dehumidification

option)

Figure 46. ReliaTel™ relative humidity sensor

(dehumidification option)

40 RT-SVX21U-EN

Page 41

Installation

Figure 48. Electromechanical control customer low voltage routing (all units except 10 ton high efficiency)

Figure 49. ReliaTel™ control customer low voltage routing (all units except 10 ton high efficiency)

RT-SVX21U-EN 41

Page 42

Installation

Figure 50. ReliaTel™ (without TBUE) control customer wire routing (10 ton high efficiency)

ReliaTel OPTIONS MODULE (RTOM)

LOW-VOLTAGE

TERMINAL BOARD

(LTB)

COMMUNICATION INTERFACE (COMM)

REFRIGERATION MODULE (RTRM)

ENTER CONTROL BOX THROUGH HOLE IN OUTDOOR DIVIDER PANEL. SECURE FIELD WIRING WITH POP-IN WIRE TIE NEAR HOLE IN OUTDOOR DIVIDER PANEL.

ENTER UNIT THROUGH HOLE IN POST.

Figure 51. ReliaTel™ (with TBUE) control customer wire routing (10 ton high efficiency)

ReliaTel OPTIONS MODULE (RTOM)

LOW-VOLTAGE

TERMINAL BOARD

(LTB)

COMMUNICATION INTERFACE (COMM)

REFRIGERATION MODULE (RTRM)

UNPOWERED

CONVENIENCE

OUTLET

ENTER CONTROL BOX THROUGH HOLE IN OUTDOOR DIVIDER PANEL. SECURE FIELD WIRING WITH POP-IN WIRE TIE NEAR HOLE IN OUTDOOR DIVIDER PANEL.

EXIT TBUE ENCLOSURE THROUGH HOLE IN WRAPPER.

ENTER UNIT THROUGH THE BASE.

ROUTE FIELD WIRING ALONG SIDE OF TBUE WRAPPER. SECURE WITH SCREW-IN WIRE TIES.

42 RT-SVX21U-EN

Page 43

Figure 52. Electromechanical (without TBUE) control customer wire routing (10 ton high efficiency)

Installation

Figure 53. Electromechanical (with TBUE) control customer wire routing (10 ton high efficiency)

RT-SVX21U-EN 43

Page 44

Installation

Space Temperature Averaging (ReliaTel™ Only)

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

Using the BAYSENS016* or BAYSENS077*, at least four sensors are required to accomplish space temperature averaging. See diagram below.

Figure 54. Examples

• Example #1 illustrates two series circuits with two sensors in each circuit wired in parallel.The square of any number of remote sensors is required.

• Example #2 illustrates three sensors squared in a series/parallel circuit. Using BAYSENS077*, two sensors are required to accomplish spacetemperature averaging.

• Example #3 illustrates the circuit required for this sensor. Table 10, p. 46 lists the temperature versus resistance coefficient for all sensors.

Note: Wiring pin numbers are for reference only.There

are multiple smoke detector systems that could have differently numbered pins. For correct wiring

44 RT-SVX21U-EN

details, please refer to the specific smoke detector literature that accompanied this unit.

Page 45

Figure 55. Typical field wiring diagrams for optional controls (ReliaTel™ only)

Installation

BAYSENS075*

BAYSENS106*

BAYSENS073* BAYSENS074*

BAYSENS108*

BAYSENS075*

BAYSENS110*

BAYSENS119*

BAYSENS075* ASYSTAT669A OPTIONAL REMOTE SENSOR

RT-SVX21U-EN 45

Page 46

Installation

Table 10. Temperature vs. resistance

Temperature

Degrees F° Degrees C° Nominal Resistance

-20° -28.9° 170.1 K - Ohms

-15° -26.1° 143.5 K - Ohms

-10° -23.3° 121.4 K - Ohms

-5° -20.6° 103.0 K - Ohms 0° -17.8° 87.56 K - Ohms 5° -15.0° 74.65 K - Ohms

10° -12.2° 63.80 K - Ohms 15° -9.4° 54.66 K - Ohms 20° -6.7° 46.94 K - Ohms 25° -3.8° 40.40 K - Ohms 30° -1.1° 34.85 K - Ohms 35° 1.7° 30.18 K - Ohms 40° 4.4° 26.22 K - Ohms 45° 7.2° 22.85 K - Ohms 50° 10.0° 19.96 K - Ohms 55° 12.8° 17.47 K - Ohms 60° 15.6° 15.33 K - Ohms 65° 18.3° 13.49 K - Ohms 70° 21.1° 11.89 K - Ohms 75° 23.9° 10.50 K - Ohms 80° 26.7° 9.297 K - Ohms 85° 29.4° 8.247 K - Ohms 90° 32.2° 7.330 K - Ohms 95° 35.0° 6.528 K - Ohms

Table 12. Iron pipe size (SI) millimeters

Iron Pipe Size (SI) Millimeters

Length of Pipe

(Meters)

4.6 2.15 4.98 9.76 21.23 34.54

9.1 1.47 3.39 6.82 15.14 24.06

13.7 1.21 2.80 5.63 12.31 19.82

18.3 1.07 2.43 4.89 10.76 17.27

22.9 — 2.18 4.38 9.76 15.40

Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Meter Per

Hr. with Pressure Drop of 74.6 Pa and Specific Gravity of 0.60.

15 mm

Pipe

20 mm

Pipe

25 mm

Pipe

32 mm

Pipe

40 mm

Pipe

Figure 56. Schematic diagram for field gas piping to

unit

Table 11. Sizing natural gas pipe mains and branches

Iron Pipe Size (IPS) Inches

½"

¾"

Length of Pipe (Ft.)

15 76 176 345 750 1220 30 52 120 241 535 850 45 43 99 199 435 700 60 38 86 173 380 610 75 77 155 345 545

Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Ft. Per Hr .

with Pressure Drop of 0.3" and Specific Gravity of 0.60

Pipe

1¼"

1½" Pipe

46 RT-SVX21U-EN

Page 47

Pre-Start

Use the checklist provided below in conjunction with the

“General Unit Requirements” checklist to ensure that the

unit is properly installed and ready for operation.

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

Verify that the condenser airflow will be unobstructed.

WARNING

Rotating Components!

Failure to follow all safety precautions below could result in rotating components cutting and slashing technician which could result in death or serious injury. During installation, testing, servicing and troubleshooting of this product it may be necessary to work with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks.

• Verify that the condenser fan and indoor blower turn freely without rubbing and are properly tightened on the shafts.

• Check the supply fan belts for proper tension and the fan bearings for sufficient lubrication. If the belts require adjustment, or if the bearingsneed lubricating, refer to the maintenance section of this manual for instructions.

• Verify that acondensate trap is installed and the piping is properly sized and pitched.

• Verify that the correct size and number of filters are in place.

• Inspect the interior of the unit for tools and debris and install all panels in preparation for starting the unit.

Voltage Imbalance

Three phase 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. Eachreading must fallwithin the utilizationrange 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.

Excessive three phase voltage imbalance between phases 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=

AV (Average Voltage)=

V1, V2, V3 = Line Voltage Readings

VD = Line Voltage reading that deviates the farthest from

the average voltage.

100 x AV - VD

Volt 1 + Volt 2 + Volt 3

where;

Example: If the voltage readings of the supply power

measured 221, 230, and 227, the average volts would be:

221 + 230 + 227

VD (reading farthest from average) = 221

The percentage of imbalance equals:

100 x 226 - 221

226

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 is over 2%, notify the proper agencies to correct the voltage problem before operating this equipment.

= 226 Avg.

= 2.2%

Electrical Phasing (Three Phase Motors)

The compressor motor(s) and the supply fan motor are

internally connected for the proper rotation when the incoming power supply is phased as A, B, C.

Proper electrical supply phasing can be quickly determined and corrected beforestarting the unit by using an instrument such as an Associated Research Model 45 Phase Sequence Indicator and following the steps below:

• Turn the field supplied disconnect switch that provides power to the main power terminal block or to the “Line” side of the optionalfactory mounted disconnect switch to the “Off” position.

• Connect the phase sequence indicator leads to the terminal block or to the “Line” side of the optional factory mounted disconnect switch as follows;

Black (phase A) to L1

Red (phase B) to L2

Yellow (phase C) to L3

RT-SVX21U-EN 47

Page 48

Pre-Start

• Close the field supplied main power disconnect switch or circuit protector switch that provides the supply power to the unit.

Note: Upon closing main power disconnect and the unit

mounted disconnect switch or circuit breaker, the phase monitor will verify proper phasing. If LED on face of the monitor is red, correct supply power fault.

WARNING

Live Electrical Components!

Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When 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.

To prevent injury or death from electrocution, it is the

responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

• Observe the ABC and CBA phaseindicator lights on the face of the sequencer.The ABC indicator lightwill 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 the main electrical power and recheck the phasing. If the phasing is correct, open the disconnect switch or circuit protection switch and remove the phase sequence indicator.

Compressor Crankcase Heaters (Optional)

Eachcompressor can be equipped with a crankcase heater (on some units the crankcase heater comes standard).The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the “Off” cycle to reduce oil foaming during compressor starts. Oil foaming occurs when refrigerant condenses in the compressor and mixes with the oil. In lower ambient conditions, refrigerant migration to the compressor could increase.

When the compressor starts, the sudden reduction in

crankcase pressure causes the liquid refrigerant to boil rapidly causing the oil to foam.This condition could damage compressor bearings due to reduced lubrication and could cause compressor mechanical failures.

Before starting the unit in the “Cooling” mode, set the system switch to the “Off” position and turn the main power disconnect to the “On” position and allow the crankcase heater to operate a minimum of 8 hours.

Before closing the main power disconnect switch, insure that the “System” selection switch is in the “Off” position and the “Fan” selection switch is in the “Auto” position.

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

Note: Upon closing main power disconnect and the unit

mounted disconnect switch or circuit breaker, the phase monitor will verify proper phasing. If LED on face of the monitor is red, correct supply power fault.

WARNING

Live Electrical Components!

To prevent injury or death from electrocution, it is the

responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

ReliaTel™ Controls

Upon power initialization, the RTRM performs selfdiagnostic checks to insure that all internal controls are functional. It also checks the configuration parameters against the components connected to the system.The Liteport LED located on the RTRM module is turned “On” within one second of power-up if internal operation is okay.

Use one of 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 Liteport 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 Liteport LED will glow continuously and the unit will revert to the

“System” control.

48 RT-SVX21U-EN

Page 49

Table 13. Service test guide for component operation

Pre-Start

Test

Step Mode Fan Econ

Fan On

Minimum

Ventilation

Economizer

Test Open

(e)

(a)The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint. (b)The PWM Output is in reference to the user selected maximum unit fan speed. (c) Regardless of the Economizer Mode configuration, the unit will run the Supply Fan at the minimum speed during the Economizer step of the Service

Test. (d)The condenser fans will operate any time a compressor is ‘On’ providing the outdoor air temperatures are within the operating values. (e) Steps for optional accessories and non-applicable modes in unit will be skipped. (f) Units with Enhanced Dehumidification only will not perform this step during Service Test.

Cool

Stage 1

Cool

Stage 2

Cool

Stage 3

Reheat On Minimum On On Off Off 33KΩ 100%

Heat

Stage 1

Heat

Stage 2

On Selectable Off Off Off Off

On Open Off Off Off Off 3.3K

On Minimum Off Off On Off 10K

On Minimum Off Off On On 15K

(a)

Minimum

Position

Setpoint 0%

Minimum

Position

Minimum

Position

Minimum

Position

Comp 1 Comp 2 Heat 1 Heat 2 Resistance

Off Off Off Off

2.2KΩ 50% low

Ω 50%

(d)

Off Off Off 4.7KΩ 82% low

(d)

Off Off 6.8KΩ 100%

Off Off 8.2KΩ 100% High

Ω 100% High

PWM

Output

Multi-Speed Fan

(b)

(c)

(f)

Output

High (2-step cooling) Low (3-step cooling)

low

High

Test Modes

There are three methods in which the “Test” mode can be

cycled at LTB-Test 1 and LTB-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 start-up of the unit, this method allows the technician to cycle a component “On” and have up to one hour to complete the check.

2. ResistanceTest Mode - This method can be used for start-up providing a decade boxfor variableresistance 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 inthe specific test mode for approximately one hour even though the resistance is left on the test terminals.

3. AutoTest Mode -This method is not recommended for start-up due to the short timing between individual component steps.This method initiates the different components of the unit, one at a time, when a jumper is installed across the test terminals.The unit will start the first test step and change to the next step every 30 seconds.

At the end of the test mode, control of the unit will automatically revert to the applied “System” control method.

For unit test steps, test modes, and step resistance values to cycle the various components, refer to Table 13, p. 49.

ReliaTel™ Controls

Upon power initialization, the Gas Ignition Module (IGN) 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 System LED located on the IGN module is turned “On” within one second of power-up if internal operation is okay.

RT-SVX21U-EN 49

Page 50

Pre-Start

Electromechanical Controls Test Procedure

See unit schematic for correct wire numbers.

FanTest and Minimum Ventilation

Connect red thermostat wire (R) to black thermostat wire (G).

Economizer Cooling

Connect a jumper wireacross OTS on Economizer Control (ECA).

Connect red thermostat (R) wire to yellowthermostat wire (Y1).

Cool 1

Connect red thermostat wire (R) to yellowthermostat wire (Y1).

Cool 2

Connect red thermostat wire (R) to yellowthermostat wire (Y2).

Heat 1

Connect red thermostat wire(R) to brown thermostat wire (W1).

Heat 2

Connect red thermostat wire(R) to brown thermostat wire (W2).

50 RT-SVX21U-EN

Page 51

Unit Start-Up

Verifying Proper Air Flow

WARNING

Live Electrical Components!

Units with 5-Tap Direct Drive Indoor Fan

The indoor fan motor is factory wired to operate on speed

tap 1 in the cooling and heating mode for electric/electric units. For Gas/Electric units, the motor is factory wired to operate on speed tap 1 during cooling. For 3 & 4 ton Gas/ Electric units operating in heat mode, the minimum setting isTap 4.

For these units, a separate tap terminal is provided to change speeds automatically between heating and cooling.The motor can be rewired for different speed settings should the application require it. Refer to the wiring diagram that shipped in the unit and the unit fan performance tables in the Service Facts.

The indoor fan motors are specificallydesigned to operate

within the BHP parameters listed in the fan performance tables of the unit Service Facts.

When verifying direct drive fan performance, the tables

must be used somewhat differently than those of belt driven fans. Fan performance diagnostics can be easily recognized when these tables are used correctly.

Before starting the SERVICETEST, set the minimum position setpoint for the economizer to 0 percent using the setpoint potentiometer located on the Economizer Control (ECA), if applicable.

ReliaTel™ Control: Using the ServiceTest Guide in

Table 13, p. 49, momentarily jump across theTest 1 &Test

2 terminals on LTB1 one time to start the Minimum

Ventilation Test.

Electromechanical Control: Using the ServiceTest

Guide perform the proper test mode connections.

With the fan operating properly, determine the total

system external static pressure (inches w.c.) by the following method (ReliaTel™/Electromechanical):

1. Measure the supply andreturn duct staticpressure and sum the resulting absolute values,

2. Use the accessory pressure drop table in the Service Facts, to calculate the total static pressure drop for all of the accessories installed on the unit; i.e., curb, economizer, etc.

Note: Accessory static pressure drop is based on desired

CFM and may not be actual static pressure drop.

3. Add the total accessory static pressure drop (step 2) to the duct external static pressure (step 1).The sum of these two values represents the total system external static pressure.

Using the Fan PerformanceTables in the Service Facts, look up the selected speed tap setting and match the measured ESP to determine the approximate CFM.

If the required CFM is too low, (external static pressure is high) do one or both of the following and repeat procedure:

a. Relieve supply and/or return duct static.

b. Change indoor fan speed tap to a higher value

If the required CFM is too high, (external static pressure is low), do one or both of the following and repeat procedure:

a. Increase supply and/or return duct static.

b. Change indoor fan speed tap to a lower value.

Note: Minimum setting for units with Gas or Electric Heat

is320CFMperTon.For3&4TonGasHeat units operating in heating mode the heat speed set cannot be lower than Speed Set 4.

4. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

Units with Belt Drive Indoor Fan

The indoor fan speed is changed by opening or closingthe

adjustable motor sheave.

Before starting the SERVICETEST, set the minimum position setpoint for the economizer to 0 percent using the setpoint potentiometer located onthe Economizer Control (ECA), if applicable.

ReliaTel™ Control: Using the ServiceTest Guide in

Table 13, p. 49, momentarily jump across theTest 1 &Test

2 terminals on LTB1 one time to start the Minimum

Ventilation Test.

Electromechanical Control: Using the ServiceTest

Guide perform theproper test mode connections.Once the supply fan has started, check for proper rotation.The direction of rotation is indicated by an arrow on the fan housing.

RT-SVX21U-EN 51

Page 52

Unit Start-Up

With the fan operating properly, determine the total

system airflow (CFM) by (ReliaTel™/Electromechanical):

1. Measuring the actual RPM,

2. Measure the amperage at the supply fan contactor and compare it with the fullload amp (FLA) rating stamped on the motor nameplate.

a. Calculate the theoretical BHP using (Actual Motor

Amps/ Motor Nameplate Amps) X Motor HP.

b. Using the fanperformance tables in theunit Service

Facts, plot the actual RPM (step 1) and the BHP (step 2a) to obtain the operating CFM.

3. If therequired CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a. Relieve supply and/or return duct static.

b. Change indoor fan speed and repeat steps 1 and 2.

• ToIncrease Fan RPM;Loosen the pulleyadjustment set screw and turn sheave clockwise.

• To Decrease Fan RPM; Loosen the pulley adjustment set screw and turn sheave counterclockwise.

• If the required CFM is too high, (external static pressure is low causing motor HP output to be above table value), change indoor fan speed and repeat steps 1 and 2.

• To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

Using the ServiceTest Guide in Table 13, p. 49, momentarily jump across theTest 1 &Test 2 terminals on LTB1. Repeat process until ServiceTest Mode is at Cool 2 (2-Steps of Cooling Applications Only) or Cool 3 (3-Steps of Cooling applications).The indoor motor shall be operating @ 100%, to verify turn DA COOL_FAN SPD potentiometer full clockwise, voltage should read ~7.5 Vdc across harness test terminals.The Unit schematic illustrates location for measuring the indoor motor speed voltage.

Table 14. RPM table

Potentiometer

Voltage

1.25 217 4.50 1061

1.50 312 4.75 1126

1.75 362 5.00 1191

2.00 427 5.25 1253

2.25 479 5.50 1315

2.50 543 5.75 1374

2.75 605 6.00 1432

3.00 668 6.25 1487

3.25 732 6.50 1539

3.50 797 6.75 1588

3.75 863 7.00 1633

4.00 929 7.25 1675

4.25 995 7.50 1700

Note: Factory setting is 7.5V

Motor RPM

Potentiometer

Voltage

Motor RPM

Units with Direct Drive Indoor Fan Electromechanical Control

Much of the systems performance and reliability is closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.Theindoor fan speed is changed by adjusting the output voltage from the MMC/ECM board tothe direct drive fan. Beforestarting the SERVICETEST, set the minimum position setpoint for the economizer to 0 percent using the setpoint potentiometer located on the Economizer Control (ECA), if applicable.

ReliaTel™ Units with Direct Drive Indoor Fan (10Tons Standard Efficiency, 6(074) to 10 Tons High Efficiency)

Much of the systems performance and reliability is closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.Theindoor fan speed is changed by adjusting the voltage from the RTOM Indoor Fan Speed output to the direct drive plenum fan. If installed, before starting the SERVICETEST disable the Economizer by disconnecting the 4 pin power connector located at the base of the Economizer Control (ECA).

Once the supply fan has started, determine the total system airflow (CFM)

1. Measure the DC voltage across harness test terminals. Using the fan rpm table shown above, determine RPM correlated to measured voltage.

2. If the required CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a. Relieve supply and/or return duct static.

b. Change indoor fan speed and repeat steps 1 and 2.

• To Increase/Decrease Fan RPM turn DA COOL_FAN SPD on the RTOM clockwise/counter-clockwise.

3. If the required CFM is too high, (external static pressure

is low causing motor HP output to be above table value), change indoor fan speed and repeat steps 1 and 2.

• Stop the SERVICETEST, turn the main power disconnect switch to the “Off” position and reconnect Economizer 4-pin power connector if disconnected for this procedure.

Proceed to the next component start-up procedure.

Electromechanical Control: Using the ServiceTest

Guide perform the proper test mode connections.

Once the supply fan has started, determine the total system airflow (CFM) by (ReliaTel™/Electromechanical):

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Unit Start-Up

1. Measure theamperage at the supply fan contactor and compare it with the full load amp (FLA) rating for the evaporator motor stamped on the unit nameplate.

a. Calculate the theoretical BHP using (Actual Motor

Amps/Motor Nameplate Amps) X Motor HP.

b. Using the fanperformance tables in theunit Service

Facts, plot the actual RPM (step 1) and the BHP (step 2a) to obtain the operating CFM.

2. If therequired CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a. Relieve supply and/or return duct static.

b. Change indoor fan speed and repeat steps 1 and 2.

• For ECM board:To Increase/Decrease Fan RPM:

a. Push and hold the SET button for 3 sec. Board will

display Motor 1 parameter name: Hi 1.

b. Slow push SET again to display the parameter’s

current value =7.50 volts.

c. Push on + or – button to adjust parameter todesired

value = XXX volts.

d. Push and hold SET button for 3 sec to “save” the

value. After save is complete, Hi 1 will show again.

e. After the voltage Hi 1 is successfully changed, the

display sequence will be:

MTR 1---> XXX -----> MTR2 -----> 0.00----->FST1---->ON/ OFF----->FST2------>ON/OFF------->EhEn-- --->ON/OFF

The motor will ramp up or down to adjust to the input

signal. Using the fan rpm table above, determine RPM correlated to displayed voltage.

• If the required CFM is too high, (external static pressure is low causing motor HP output to be above table value), change indoor fan speed and repeat steps 1 and 2.

• To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

Units with Constant CFM Direct Drive Indoor Fan

Much of the systems performance and reliability is closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.Theindoor fan provides a constant CFM base on voltage output for the potentiometer on the RTOM board. Before starting the SERVICETEST, set the minimum position setpoint for the economizer to 0% using the setpoint potentiometer located on the Economizer Control (ECA), if applicable.

ReliaTel™ Control. Using the ServiceTest Guide in

Table 13, p. 49, momentarily jump across theTest 1 &Test

2 terminals on LTB1 one time to start the Minimum

Ventilation Test.

Once the supply fan has started, determine the total system airflow (CFM) by:

1. Measure the DC voltage across pinsTP1 and ground (screw on cornerof RTOMboard). Lookup desiredCFM using the voltage CFM table shownon the accesspanel label or in the unit Service Facts; record corresponding voltage. Adjust potentiometer until output voltage acrossTP1 and ground achieves desired CFM setpoint.

2. To increase voltage/CFM, turn potentiometer clockwise.

3. To decrease voltage/CFM, turn potentiometer counterclockwise.

Note: With ID fan access panel removed, fan will operate

at lower RPM due to the decrease in pressure. Once panel is installed, RPM will increase.

17 Plus units with the constant CFM direct drive indoor fan

Proper airflow is critical to unit operation. All 17 Plus Precedent units (037, 047, and 067 units) use an indoor fan that provides a constant CFM.There are two different types of 17 Plus Precedent units: Single Zone VAV units and Multi Speed units. Both types of units use the same type of indoor motor and the same airflow adjustment procedure.

To adjust airflow on a 17 Plus unit the Service Test mode

must be used for accurate results. Additionally, airflow adjustments should be made in either “Cool Stage 2" or any stage of heat becausethe fan is driven to its maximum setting during thesestages. Only themaximum fan setting requires adjustment, all other fan speeds follow the maximum adjustment and do not require any adjustment.

Using the ServiceTest Guide in Table 13, p. 49, enter the unit into either “Cool Stage 2" orany stage of heatby using either the “StepTest Mode” or “ResistanceTest Mode”.

Once the unit is in either “Cool Stage 2" or any stage of heat, system airflow (CFM) is determined by:

1. In the indoor fan compartment, locate the R136 potentiometer on the RTOM circuit board (also designated “DA COOL - FAN SPD”). Also, locate the

TP1 test pin loop next to the R136 potentiometer.

2. Measure the DC Voltage across the test pinTP1 and unit chassis ground. Compare DC voltage to the CFM chart shown in Table 15, p. 54. Table 15, p. 54 shows what DC voltage corresponds to CFM per ton of unit cooling.

Note: If 1200 cfm is required from a 3 ton unit

(037) the R136 potentiometer should be adjusted so that the DC voltage measured atTP1 to ground reads 1.65 volts DC.

3. To increase theTP1 voltage, turn the R136 potentiometer clockwise.

4. To decrease theTP1 voltage, turn the R136 potentiometer counter-clockwise.

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Unit Start-Up

Note: With the indoor fan access panel removed, the fan

will operate at a lower RPM because static pressure is reduced with the door open. Once the panel is returned the RPM of the indoor fan will increase.

Table 15. Cfm vs. vdc

PWM% value

70 <0.1 320 75 0.7 347 80 1.25 373 85 1.65 400 90 1.95 427 95 2.17 453

100 >2.4 480

Potentiometer

Voltage (vdc) CFM/Ton

Variable Air Volume Applications

(Traditional VAV)

Supply Air Temperature Control - Occupied Cooling and Heating

The RTRM is designed to maintain a selectable supply air

temperature of 40°F to 90°F with a +/- 3.5°F deadband. In cooling, if supply air temperature is more than 3.5 degrees warmer than the selected temperature, a stage of cooling will be turned “On” (if available).Then if the supply air temperature is more than 3.5° 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 dischargeair temperature outsidethe 7° deadband. Duringlow load orlow 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 temperatureis 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.

Note: The RTRM is designed to maintain a selectable

supply air temperature of 40°F to 90°F with a +/-

3.5°F deadband. However, to reduce the risk of evaporator coil freeze-up in Precedent andVoyager Light Commercial applications, supply air temperature should not be set below 50° F.

Supply Air Temperature Control with an Economizer

The economizer is utilized to control the supply air cooling

at +1.5°F around the supplyair temperature setpoint range of 40°F and 90°F providing the outside air conditions are suitable.To reduce the risk of evaporator coil freeze-up supply air temperature should not be set below 50° F.

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, themechanical cooling willcycle as though the unit had no economizer.

Note: The RTRM is designed to maintain a selectable

supply air temperature of 40°F to 90°F with a +/-

3.5°F deadband. However, to reduce the risk of evaporator coil freeze-up in Precedent andVoyager Light Commercial applications, supply air temperature should not be set below 50°F.

VHR Relay Output

During unoccupied mode, daytime warm-up (DWU), morning warm-up (MWU) and heating mode the Supply Fan will operate at 100% of user set maximum airflow. 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 connectedbetween RTRM J6-11 andRTRM 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 controlledat 10°F below the Morning Warm-up setpoint, but not less than 50°F, by cycling one or two stages of either gas or electric heat, whichever is applicable.

MorningWarm-up (MWU) Control

MorningWarm-up is activated if the zone temperature isat 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 willswitch to the “Cooling” mode.The economizer will be held closed during the morning warm-up cycle.

DaytimeWarm-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 anight setback zone sensor. If ICSor 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 DaytimeWarm-up function is activated (switch on). Opening the DWU enable switch will disable this function.

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Unit Start-Up

If the system control islocal, the DWUinitiation setpointis 3°F below the MorningWarm-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 theTracer® Occupied heating setpoint.

The initiation and termination setpoints are selectable

setpoints designated byTracer®.

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.

Traditional VAV Standalone Operation

If a traditional VAV unit is required to operate without ICS, BAS or other “front end” controller, a jumper must be placed between J6-2 and J6-4 of the RTRM to allow local standalone control.

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 57. Transducer voltage output vs. pressure input

Supply AirTemperature Reset

The supply air temperature can be reset by using one of

four DIP switch configurations onthe RTAM orthrough 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 RTAMpotentiometer orICS is permissiblefor 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 temperaturewill 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 AirTemperature - 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 orTracer® is permissible.

3. Reset based on ZoneTemperature - 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 orTracer® is permissible.

4. Reset based on Outdoor AirTemperature -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.

Return Air Smoke Detector

The return air smoke detector is designed to shut off the

unit if smoke is sensed in the return air stream. Sampling the airflow entering the unit at the return air opening performs this function.

In order for the smoke detector to properly sense smoke in the return airstream, the airvelocity entering theunit must be between 500 and 4000 feet per minute. Equipment covered in thismanual will developan airflow velocity that falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

There are certain models however, if operated at low

airflow, will not develop an airflowvelocity that fallswithin the required 500 to 4000 feet per minute range. For these models, the design airflow shall be greater than or equal to the minimum CFM specified in the table provided

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Unit Start-Up

below. Failure to follow these instructions will prevent the smoke detector from performing its design function.

Economizer Start-Up

WARNING

Live Electrical Components!

Minimum Position Setting for 17 Plus, 6 to 10

Ton with Multi-Speed, or Single Zone VAV

1. Apply power to the unit

2. Using the ServiceTest Guide on unit access panel, momentarily jump across theTest 1 &Test 2 terminals on LTB1 one time to start indoor fan.

3. Turn the MIN POS - DCV potentiometer on the RTEM clockwise to open or counter-clockwise to close.The damper will open to this setting for low speed fan operation. When adjusting minimum position, the damper may move to the new setting in several small steps.Wait at least 15 seconds for the damper to settle at the new position. Range of damper for this setting is 0-100%.

4. Momentarily jump across theTest 1 &Test 2 terminals on LTB1, to cycle through test modes to Cool 1.

5. Turn the DCV SETPOINT - LL potentiometer on the RTEM clockwise to open or counter-clockwise to close.

This will set the minimum damper position at an

intermediate point of fan operation range of damper for this setting is 0-75%.

6. Momentarily jump across theTest 1 &Test 2 terminals on LTB1, to cycle through test modes to Cool 2.

7. Turn the MIN POS - DESIGN potentiometer on the RTEM clockwise to open or counter-clockwise to close.

This will set the minimum damper position at

maximum fan speed. Range of damper for this setting is 0-50%.

8. The economizer minimum damper position for all fan speeds is complete.The RTEM will control minimum damper position along an imaginary line between the 3 damper minimum positions based on fan speed. Note:The RTEM will limit intermediate minimum damper position to ensure proper ventilation based upon the low fan speed minimum damper position set in Step 3.

9. Replace the filter access panel.The damper will close when the blower circuit is de-energized.

WARNING

Live Electrical Components!

ReliaTel™ Control: Using the ServiceTest Guide in

Table 13, p. 49, momentarily jump across theTest 1 &Test

2 terminals on LTB1 one time to start the Minimum

Ventilation Test.

Electromechanical Control: Using the ServiceTest

Guide perform the proper test mode connections.

1. Set the minimum position setpoint for the economizer to the required percentage of minimum ventilation using the setpoint potentiometer located on the Economizer Control (ECA).

The economizer will drive to its minimum position

setpoint, exhaust fans (if applicable) may start at random, and the supply fan will start when the SERVICETEST is initiated.

WARNING

Rotating Components!

The Exhaust Fan will start anytime the economizer

damper position is equal to orgreater than the exhaust fan setpoint.

2. Verify that the dampers stroked to the minimum position.

ReliaTel™ Control:

Momentarily jump across theTest 1 &Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired startup component test is started.

Electromechanical Control:

Using the ServiceTest Guide perform the proper test mode connections.

3. Verify that the dampers stroked to the full open position.

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Unit Start-Up

4. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure. Remove electromechanical test mode connections (if applicable).

Compressor Start-Up

1. Attach a set of service gauges onto the suction and discharge gauge ports for each circuit. Refer to the refrigerant circuit illustration in the Service Facts.

ReliaTel™ Control:

Momentarily jump across theTest 1 &Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired startup componentTest is started.

Electromechanical Control:

Using the ServiceTest Guide perform the proper test mode connections.

Scroll Compressors

a. Once each compressor has started, verify that the

rotation is correct. If a scroll compressor is rotating backwards, it will not pump and a loud rattling sound can be observed.

b. If the electrical phasing is correct, before

condemning a compressor, interchange any two leads (at the compressorTerminal block) to check the internal phasing. If the compressor runs backwardfor an extendedperiod (15 to 30minutes), the motor winding can overheat and cause the motor winding thermostat to open.

2. After the compressor and condenser fan have started and operated for approximately 30 minutes, observe the operating pressures. Compare the operating pressures to the operating pressure curve in the Service Facts.

3. Check system superheat. Follow the instruction listed on the superheat charging curve in the Service Facts.

Superheat should be within ±5F ofthe superheatchart value.

4. Repeat steps 1 through 4 for each refrigerant circuit.

5. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure. Remove electromechanical test mode connections (if applicable).

Dehumidification Option

WARNING

Live Electrical Components!

Momentarily jump across theTest 1 andTest 2 terminals of the LTB1 until the unit enters test mode 7 (See Table 13,

p. 49). Once the unit is in the reheat test mode, verify that

the 3 way valve has shifted to the reheat position and that the supply temperature rises 10°F more than when in cooling mode stage 2.

Monitor the suction pressure for 15 minutes.The suction pressure should remain within 5 psi of normal cooling operation.

Gas Heat Units

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

ReliaTel™ Control: Follow theTest Guide in Table 13,

p. 49 to start the unit in the heating mode. Momentarily

jump across theTest 1 & Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired start-up componentTest is started.

Electromechanical Control. Using the ServiceTest

Guide perform the proper test mode connections.

When starting the unit for the first time or servicing the

heaters, it is a good practice to start the heater with the main gas supply turned “Off”.

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

Final System Setup

After completing all of the pre-start and start-up

procedures outlined in the previous sections (i.e., operating the unit in each of its Modes through all available stages of cooling & heating), perform these final checks before leaving the unit:

• Program the Night Setback (NSB) panel (if applicable) for proper unoccupied operation. Refer to the programming instructions for the specific panel.

• Verify that the Remote panel “System” selection switch, “Fan” selection switch, and “Zone

Temperature” settings for automatic operation are

correct.

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Unit Start-Up

• Inspect the unit for misplaced tools, hardware, and debris.

• Verify that all exterior panels including the control panel doors and condenser grilles are secured in place.

• Close the main disconnect switch or circuit protector switch that provides the supply power to the unit’s terminal block or the unit mounted disconnect switch.

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Maintenance

WARNING

Hazardous Service Procedures!

Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury.

Technicians, in order to protect themselves from

potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.

Fan Belt Adjustment - Belt Drive Units

WARNING

Live Electrical Components!

WARNING

Rotating Components!

The fan belts must be inspected periodically to assure

proper unit operation.

Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a matched set of belts to ensure equal belt length.

When removing or installing the new belts, do not stretch

them over the sheaves. Loosen the belts using the belt tension adjustment bolts on the motor mounting base.

Once the new belts are installed, using a Browning or Gates tension gauge (or equivalent) illustrated in

Figure 58, p. 59, adjust the belt tension as follows;

1. To determine the appropriate belt deflection;

a. Measure the center-to-center shaft distance (in

inches) between the fan and motor sheaves.

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

resulting value represents the amount of belt deflection that corresponds to the proper belt tension.

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

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

4. Place the large end of the gauge at the center of the belt span, then depress the gauge plunger until thelarge Oring is even with the top of the next belt or even with a straightedge placed across the fan and motor sheaves. Refer to Figure 58, p. 59.

5. Remove the belt tension gauge.The small O-ring now indicates a number other than zero on the plunger’s force scale.This number represents the force (in pounds) required to give the needed deflection.

6. Compare the “force” scale reading (Step 5) with the appropriate“force” value listed in Table 16, p. 60. If the “force” reading is outside the range, readjust the belt tension.

Note: Actual belt deflection “force” must not exceed the

maximum “force” value shown in Figure 58, p. 59.

7. Recheck the belt tension at least twice during the first 2 to 3 days of operation. Belt tension may decrease until the new belts are “run in”.

Figure 58. Belt tension gauge

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Maintenance

Table 16. Belt tension measurement and deflection

Deflection Force (Lbs.)

Belts Cross Section

Small P.D Range

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

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

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

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

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

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

Super Gripbelts Gripnotch

Min. Max. Min. Max. Min. Max

Steel Cable Gripbelts

Monthly Maintenance

WARNING

Hazardous Voltage!

Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.

Filters

Inspect the return air filters. Clean or replace them if necessary. If included, leave filter removal tool in unit. Refer to the unit Service Facts for filter information.

Return Air Smoke Detector Maintenance

Airflow through the unit is affected by the amount of dirt

and debris accumulated on the indoor coil and filters.To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

Condensate Overflow Switch

During maintenance, the switch float (black ring) must be checked to ensure free movement up and down.

Cooling Season

• Check the unit’s drain pans and condensate piping to ensure that there are no blockages.

• Inspect the evaporator and condenser coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in “Coil Cleaning” later in this section.

• Manually rotate the condenser fan(s) to ensure free movement and check motor bearings for wear. Verify that all of the fan mounting hardware is tight.

• Inspect the F/A-R/A damper hinges and pins to ensure that all moving parts are securely mounted. Keep the blades clean as necessary.

• Verify that all damper linkages move freely; lubricate with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Check the fan shaft bearings for wear. Replace the bearings as necessary.

• Check the supply fan belt. If the belt is frayed or worn, replace it. Refer to the “Fan Belt Adjustment” section for belt replacement and adjustments.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present onthe exterior surfaces of the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping connections, etc.)

• Make sure that all retaining screws are reinstalled in the unit access panels once these checks are complete.

• With the unit running, check and record the: ambient temperature; compressor suction and discharge pressures (each circuit); superheat (each circuit);

• Record this data on an “operator’s maintenance log” like the one shown in Table 17, p. 62. If the operating pressures indicate a refrigerant shortage, measure the system superheat. For guidelines, refer to the “Compressor Start-Up” section.

Important: 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.

Heating Season

• Inspect the unit’s air filters. If necessary, clean or replace them.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Inspect both the main unit control panel and heat section control box for loose electrical components and terminal connections, as well as damaged wire insulation. Make any necessary repairs.

60 RT-SVX21U-EN

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Maintenance

• Clean burner area, verify gas heat system operates properly.

Coil Cleaning

Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by minimizing: compressor head pressure and amperage draw, evaporator water carryover, fan brake horsepower due to increase static pressure losses, airflow reduction.

At least once each year, or more often if the unit is located

in a “dirty” environment, clean the evaporator and condenser coils using the instructions outlined below. Be sure to follow these instructions as closely as possible to avoid damaging the coils.

Note: For units equipped with hail guards follow removal

procedure listed below.

Hail Guard Removal

• Unlatch hail guard.

• Pull the top ofthe hail guard outward until the fastener studs are free of the retaining nuts.

• Lift the hail guard from the lower retaining bracket and set aside.

Microchannel (MCHE) Coils

NOTICE:

Coil Damage!

Failure to follow instructions below could result in coil damage. DO NOT use any detergents with microchannel condenser coils. Use pressurized water or air ONLY, with pressure no greater than 600psi.

For additional information regarding the proper microchannel coil cleaning procedure, refer to service bulletin RT-SVB83*-EN.

Due to the soft material and thin walls of the MCHE coils, the traditional field maintenance method recommended for RoundTube Plate Fin (RTPF) coils does not apply to microchannel coils.

Moreover,chemical cleaners are a risk factorto MCHE due to the material of the coil.The manufacturer does not recommend the use of chemical cleaners to clean microchannel coils. Using chemical cleaners could lead to warranty claims being further evaluated for validity and failure analysis.

The recommended cleaning method for microchannel

condenser coils is pressurized water or air with a nonpinpoint nozzle andan ECU of at least180 with pressureno greater than 600 psi.To minimize the risk of coil damage, approach the cleaning of thecoil withthe pressure washer aimed perpendicular to the face ofthe coil during cleaning.

Note: For more details on Microchannel coil cleaning,

please refer to bulletin RT-SVB83*-EN.

Round Tube Plate Fin (RTPF) Coils

To clean refrigerant coils, use a soft brush and a sprayer

(either a garden pump-up typeor a high-pressure sprayer).

A high-quality detergent is also required; suggested

brands include “SPREX A.C.”, “OAKITE 161”, “OAKITE 166” and “COILOX”. If the detergent selected is strongly alkaline (ph value exceeds 8.5), add an inhibitor.

WARNING

Hazardous Chemicals!

Failure to follow all safety instructions below could result in death or serious injury. Coil cleaning agents can be either acidic or highly alkaline and can burn severely if contact with skin occurs. Handle chemical carefully and avoid contact with skin. ALWAYS wear Personal Protective Equipment (PPE) including goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer’s Materials Safety Data Sheet and follow all recommended safe handling practices.

1. Remove enough panels from the unit to gain access to the coil.

2. Protect all electrical devices such as motors and controllers from any over spray.

3. Straighten any bent coil fins with a fin comb.

WARNING

Hazardous Pressures!

Failure to follow safety precautions below could result in coil bursting, which could result in death or serious injury. Coils contain refrigerant under pressure.When cleaning coils, maintain coil cleaning solution temperature under 150°F to avoid excessive pressure in the coil.

4. Mix the detergent with water according to the manufacturer’s instructions. If desired, heat the solution BUT DO NOT EXCEED 150ºF maximum to improve its cleansing capability.

5. Pour the cleaning solution into the sprayer. If a highpressure sprayer is used:

a. do not allow sprayer pressure to exceed 600 psi.

b. the minimum nozzle spray angle is 15 degrees.

c. maintain a minimum clearance of 6" between the

sprayer nozzle and the coil.

d. spray the solution perpendicular (at 90 degrees) to

the coil face.

6. Spray the leaving-airflow side of the coil first; then spray the opposite side of the coil. Allow the cleaning solution to stand on the coil for five minutes.

7. Rinse both sides of the coil with cool, clean water.

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Maintenance

8. Inspect both sides of the coil; if it still appears to be dirty, repeat Step 6 and Step 7.

9. Reinstall all of the components and panels removed in

Step 1 and any protective covers installed in Step 2.

Note: For units equipped with hail guards follow

reinstallation procedure listed below.

Hail Guard Reinstallation

10.To reinstall the hail guard, locate the bottom of the hail guard in the lower bracket and secure it to the upper unit bracket with the attached fasteners.

Note: Secure hail guard latches.

Figure 59. Hail guard

11. Restore the unit to its operational status and check system operation.

Annual Maintenance

• Clean and repaint any corroded surface.

Final Process

For future reference, you may find it helpful to record the unit data requested in the blanks provided.

Complete Model Number:

Unit Serial Number:

Wiring Diagram Numbers

(from unit control panel):

Connections:

Schematics:

Table 17. Sample maintenance log

Refrigerant Circuit #1 Refrigerant Circuit #2

Date

Current

Ambient

Temp. F/C

Compr.

Oil Level

- ok

- low

- ok

- low

- ok

- low

- ok\

- low

- ok

- low

Suct.

Press.

Psig/

kPa

Disch. Press.

Psig/

kPa

Liquid Press.

Psig/

kPa

Note: Check and record the data requested above each

month during the cooling season with the unit running.

Super

-heat F/C

Subcool.

F/C

Compr.

Oil

Level

- ok

- low

- ok

- low

- ok

- low

-- ok

- low

- ok

- low

Suct.

Press.

Psig/kPa

Disch. Press.

Psig/

kPa

Liquid Press.

Psig/

kPa

Super-

heat

F/C

Subcool.

F/C

62 RT-SVX21U-EN

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Troubleshooting

WARNING

Hazardous Service Procedures!

Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury.

Technicians, in order to protect themselves from

ReliaTel™ Control

The RTRM has the ability to provide the service personnel

with some unitdiagnostics and system status information.

Before turning the main power disconnect switch “Off”, follow the steps below to check the ReliaTel Refrigeration Module (RTRM). All diagnostics & system status information stored in theRTRM will be lost when the main power is turned “Off”.

WARNING

Live Electrical Components!

To prevent injury or death from electrocution, it is the

responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

1. Verify LED onface of thephase monitor is green. IfLED is red, correct supply power fault.

2. Verify that the Liteport LED on the RTRM is burning continuously. If the LED is lit, go to Step 3.

3. If the LED is not lit, verify that 24 VAC is presence between J1-1 and J1-2. If 24 VAC is present, proceed to

Step 4. If 24 VAC is not present, check the unit main

power supply, check transformer (TNS1). Proceed to Step 4 if necessary.

4. Utilizing “Method 1” or “Method 2” in the “System Status Diagnostic” section, check the following:

• System status

• Heating status

• Cooling status

If a system failure is indicated, proceed to Step 5.Ifno failures are indicated, proceed to Step 6.

5. If a System failure is indicated, recheck Step 2 andStep

3. If the LED is not lit in Step 2, and 24 VAC is present

in Step 3, the RTRM has failed. Replace the RTRM.

6. If no failures are indicated, use one of theTEST mode procedures described in the “Unit Start-Up” section to start the unit.This procedure will allow you to check all of the RTRM outputs, and all of the external controls (relays, contactors, etc.) that the RTRM outputs energize, for each respective mode. Proceed to Step 7.

7. Step the system through all of the available modes, and verify operation of all outputs, controls, and modes. If a problem inoperation is noted in any mode, you may leave the system in that mode for up to one hour while troubleshooting. Refer to the sequence of operations for each mode, to assist in verifying proper operation. Make the necessary repairs and proceed to

Step 8 and Step 9.

8. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the power “Off” at the main power disconnect switch.

9. Refer to the individual component test procedures if other microelectronic components are suspect.

System Status Checkout Procedure

“System Status” is checked by using one of the following

two methods:

Method 1

If the Zone Sensor Module (ZSM) is equipped with a remote panel with LED status indication, you can check the unit within the space. If the ZSM does not have LED’s, use Method 2. BAYSENS110*, BAYSENS109*, BAYSENS119*, BAYSENS023A all have the remote panel indication feature.The LED descriptions are listed below.

Zone Sensor LED 1 (System)

“On” during normal operation.

“Off” if a system failure occurs or the LED fails.

“Flashing” indicates test mode.

Zone Sensor LED 2 (Heat)

“On” when the heat cycle is operating.

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Troubleshooting

“Off” when the heat cycle terminates or the LED fails.

“Flashing” indicates a heating failure.

Zone Sensor LED 3 (Cool)

“On” when the cooling cycle is operating.

“Off” when the cooling cycle terminates or the LED fails.

“Flashing” indicates a cooling failure.

Zone Sensor LED 4 (Service)

“On” indicates a clogged filter.

“Off” during normal operation.

“Flashing” indicates an evaporator fan or condensate

overflow switch failure.

Below is the complete listing of failure indication causes.

System failure

Check the voltage between terminals 6 and 9 on J6, it should read approximately 32 VDC. If no voltage is present, a system failure has occurred. Refer to Step 4 in the previous section for the recommended troubleshooting procedure.

Heating Failure

Verify Heat Failure by Ignition Module (IGN) LED indicator:

OFF: No Power or Failure

ON: Normal

Slow Flash: Normal, Heat Call

Fast Flash: Error Code:

1 Flash: Communication Failure

2 Flashes: System Lockout

3 Flashes: Pressure Switch Fail

4 Flashes: TC01 orTC02 Open

5 Flashes: Flame w/o Gas Valve

6 Flashes: Flame Rollout Open

Cooling Failure

• Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the “Zone SensorTest Procedure” section.

• Zone temperature thermistor ZTEMP on ZTS failed. Refer to the “Zone SensorTest Procedure” section.

• CC1 or CC2 24 VAC control circuit has opened, check CC1 & CC2 coils, and any of the controls below that apply to the unit (HPC1, HPC2).

• LPC1 has opened during the 3 minute minimum “on time” during 4 consecutive compressor starts, check LPC1 or LPC2 by testingvoltage between theJ1-1 & J32 terminals on the RTRM and ground. If 24 VAC is present, the LPC’s has not tripped. If no voltage is present, LPC’s has tripped.

Service Failure

• If the supply fanproving switchhas closed, the unit will not operate (when connected to RTOM), check the fan motor, belts, and proving switch.

• Clogged filter switch has closed, check the filters.

• If the condensate overflow switch is closed, the unit will not operate. Make sure the float switch is not in a tripped condition, and check for an “open” between wires connecting to RTOM J6-1, J6-2 (ReliaTel™ controls).

Simultaneous Heat and Cool Failure

• Emergency Stop is activated

Method 2

The second method for determining system status is done

by checking voltage readings at the RTRM (J6).The system indication descriptions and the approximate voltages are listed below.

System Failure

• Measure the voltage between terminals J6-9 & J6-6.

• Normal Operation = approximately 32 VDC

• System Failure = less than 1 VDC, approximately 0.75

VDC

• Test Mode = voltage alternates between 32 VDC & 0.75

VDC

Heat Failure

• Measure the voltage between terminals J6-7 & J6-6.

• Heat Operating = approximately 32 VDC

• Heat Off = less than 1 VDC, approximately 0.75 VDC

• Heating Failure = voltage alternates between 32 VDC &

0.75 VDC

Cool Failure

• Measure the voltage between terminals J6-8 & J6-6.

• Cool Operating = approximately 32 VDC

• Cool Off = less than 1 VDC, approximately 0.75 VDC

• Cooling Failure = voltage alternates between 32 VDC &

0.75 VDC

Service Failure

• Measure the voltage between terminals J6-10 & J6-6.

• Clogged Filter = Approximately 32VDC.

• Normal = Less than 1 VDC, approximately 0.75 VDC Fan Failure =voltage alternates between 32VDC & 0.75

VDC.

To use LED’s for quick status information at the unit,

purchase a BAYSENS110* ZSM and connect wires with alligator clamps to terminals 6 through10.Connected each

64 RT-SVX21U-EN

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Troubleshooting

respective terminal wire (6 through 10) from the Zone Sensor to the unit J6 terminals 6 through 10.

Note: If the system is equipped with a programmable

zone sensor, BAYSENS119* the LED indicators will not function while the BAYSENS110* is connected.

Resetting Cooling and Ignition Lockouts

Cooling Failures and Ignition Lockouts are reset in an identical manner. Method 1 explains resetting the system from the space; Method 2 explains resetting the system at the unit.

Note: Before resetting Cooling Failures and Ignition

Lockouts check the Failure Status Diagnostics by the methods previously explained. Diagnostics will be lost when the power to the unit is disconnected.

Method 1

To reset the system from the space, turn the “Mode”

selection switch at the zone sensor to the “Off” position.

After approximately 30 seconds, turn the “Mode”

selection switch to the desired mode, i.e. Heat, Cool or

Auto.

Method 2

To reset the system at the unit, cycle the unit power by

turning the disconnect switch “Off” and then “On”.

Lockouts can be cleared through the building management system. Refer to the building management system instructions for more information.

Fan Failure Switch

When the “Fan Failure” switch is wired to the RTOM, the

LED will remain flashing the entire time the fan proving switch is closed, indicating a fan failure,and itwill shut the unit operations down.

Condensate Overflow Switch

When the “Condensate Overflow Switch” is closed, a

drain pan overflow condition is indicated and it will shut unit operations down.

Zone Temperature Sensor (ZTS)

Tests

Note: These procedures are not for programmable or

digital models and are conducted with the Zone Sensor Module electrically removed from the system.

Test 1 - Zone TemperatureThermistor

(ZTEMP)

This component is tested by measuring the resistance

between terminals 1 and 2 on the ZoneTemperature Sensor. Below are some typical indoor temperatures, and corresponding resistive values.

Test 2 - Cooling Set Point (CSP) and

Heating Set Point (HSP)

Zone Temperature Sensor (ZTS) Service Indicator

The ZSM SERVICE LED is a generic indicator, that will

signal the closing of a Normally Open switch at any time, providing the Indoor Motor (IDM) is operating.This indicator is usually used to indicate a clogged filter, or an air side fan failure.

The RTRM will ignore the closing of this Normally Open

switch for 2 (±1) minutes.This helps prevent nuisance SERVICE LED indications.The exception is the LED will flash 40 seconds after the fan is turned “On” if the Fan Proving Switch is not made.

Clogged Filter Switch

This LED will remain lit the entire time that the Normally

Open switch is closed.The LED will be turned off immediately after resetting the switch (to the Normally Open position), or any time that the IDM is turned “Off”.

If the switch remains closed, and the IDM is turned “On”, the SERVICE LED will be turned “On” again after the 2 (±1) minute ignore delay.

This LED being turned “On”, will have no other affect on

unit operation. It is an indicator only.

Table 18. Cooling setpoint and heating setpoint

Zone

Temperature

50 F° 10.0 C° 19.9 K-Ohms 55 F° 12.8 C° 17.47 K-Ohms 60 F° 15.6 C° 15.3 K-Ohms 65 F° 18.3 C° 13.49 K-Ohms 70 F° 21.1 C° 11.9 K-Ohms 75 F° 23.9 C° 10.50 K-Ohms 80 F° 26.7 C° 9.3 K-Ohms 85 F° 29.4 C° 8.25 K-Ohms 90 F° 32.2 C° 7.3 K-Ohms

The resistance of these potentiometers are measured

between the following ZSM terminals. Refer to the chart above for approximate resistances at the given setpoints.

Cool SP =Terminals 2 and 3

Range = 100 to 900 Ohms approximate

Heat SP =Terminals 2 and 5

Range = 100 to 900 Ohms approximate

Nominal ZTEMP

Resistance

Test3-SystemMode and Fan Selection

The combined resistanceof the Mode selection switch and

the Fan selection switch can be measured between

RT-SVX21U-EN 65

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Troubleshooting

terminals 2 and 4 on the Zone Sensor.The possible switch combinations are listed below with their corresponding resistance values.

Test 4 - LED Indicator Test, (SYS ON, HEAT,

COOL & SERVICE)

Method 1

Testing the LED usinga meter with diode test function.Test

both forward and reverse bias. Forward bias should measure a voltage drop of 1.5 to 2.5 volts, depending on your meter. Reverse bias will show an Over Load, or open circuit indication if LED is functional.

Method 2

Testing the LED with an analog Ohmmeter. Connect

Ohmmeter across LED in one direction, then reverse the leads for the opposite direction.The LED should have at least 100 times more resistance in reverse direction, as compared with the forward direction. If high resistance in both directions, LED is open. If low in both directions, LED is shorted.

Method 3

To test LED’s with ZSM connected to unit, test voltages at

LED terminals on ZSM. A measurement of 32 VDC, across an unlit LED, means the LED has failed.

Relative Humidity Sensor Test

This component is measured by measuring the DC mA

output signal on the Relative Humidity Sensor. Verify accuracy of the sensor annually. If the output reading is DC mA 0, first verify that power is applied to the sensor.A reading of 4 corresponds to 0% RH and 20 DC mA corresponds to 100% RH.

% RH DC mA

30 8.8 40 10.4 50 12.0 60 13.6 70 15.2 80 16.8

Note: Measurements should be made from LED common

(ZSM terminal 6 to respective LED terminal).

Programmable & Digital Zone Sensor

Test

Testing serial communication voltage

1. Verify 24 VAC is present between terminals J6-14 & J6-

11.

2. Disconnect wires from J6-11 and J6-12. Measure the voltage between J6-11 and J6-12, should be about 32 VDC.

3. Reconnect wires toterminals J6-11and J6-12. Measure voltage again betweenJ6-11 and J6-12, voltage should flash high and low every 0.5 seconds.The voltage on the low end will measure about 19VDC, while the voltage on the high end will measure from approximately 24 to 38 VDC.

4. Verify all modes of operation, by running the unit through all of the steps in the “Test Modes” section discussed in “Unit Start-Up”.

5. After verifying proper unit operation, exit the test mode.Turn the fan on continuously at the ZSM, by pressing the button with the fan symbol. If the fan comes on and runs continuously, the ZSM is good. If you are not able to turn the fan on, the ZSM is defective.

ReliaTel™ Refrigeration Module (RTRM) Default Chart

If the RTCI loses input from the building management system, the RTRM will control in the default mode after approximately 15 minutes. If the RTRM loses the Heating and Cooling setpoint input, the RTRM will control in the default mode instantaneously.The temperature sensing thermistor in the Zone Sensor Module is the only component required for the “Default Mode” to operate.

Unit Operation without a Zone Sensor

This procedure is for temporary operation only.The

economizer and condenser fan cycling functions are disabled.

WARNING

Hazardous Voltage!

1. Open and Lock the unit disconnect switch.

2. Remove the Outside Air Sensor (OAS) from the condenser section of unit.

3. Use two (2) wire nuts, to individually cap the wires.

4. Locate the RTRM (J6). Connect two (2) wires to terminals J6-1 and 2.

5. Connect the sensor (OAS) using two wire nuts to the two (2) field supplied wires that were connected to terminals 1 and 2 on J6.

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Troubleshooting

Unit Economizer Control (ECA)

Troubleshooting

ReliaTel™ Control

Verify Economizer Status by Economizer Actuator (ECA)

LED indicator:

• OFF: No power or failure

• ON: Normal, OK to economize

• Slow Flash: Normal, not OK to economize

• Fast Flash - 1/2 second on / 2 seconds off:

• Error Code: Communications failure

• Pulse Flash:2 seconds on / 1/2 second off:

• Error Code:

• 1 Flash: Actuator Fault

• 2 Flashes: CO

• 3 Flashes: RA Humidity Sensor

• 4 Flashes: RA Temp Sensor

• 5 Flashes: OA Quality Sensor

• 6 Flashes: OA Humidity Sensor

• 7 Flashes: OATemp Sensor

• 8 Flashes: MA Temp Sensor

• 9 Flashes: RAM Fault

• 10 Flashes: ROM Fault

• 11 Flashes: EEPROM Fault

Electromechanical Control

The IGN has the ability to provide the service personnel

with some unitdiagnostics and system status information.

Before turning the main power disconnect switch “Off”, follow the steps below to check the Ignition Module (IGN).

Live Electrical Components!

To prevent injury or death from electrocution, it is the

responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

1. Verify LED onface of thephase monitor is green. IfLED is red, correct supply power fault.

2. Verify that the LED on the IGN is burning continuously. If the LED is lit, go to Step 4.

Sensor

WARNING

3. If the LED is not lit, verify that 24 VAC is present between R and B. If the LED is not lit and 24 VAC is present replace the IGN. If 24VAC is not present, check transformer (TNS1). Proceed to Step 4 if necessary.

4. If no failures are indicated, use theTEST mode procedures described in the “Unit Start-Up” section or thermostat to start the unit.This procedure will allow you to check all of the external controls (relays, contactors, etc) and the IGN.

5. Test the system throughall of the available modes,and verify operation of all outputs, controls, and modes. Refer to the sequence of operations for each mode, to assist in verifying proper operation. Make the necessary repairs and proceed to Step 6 and Step 7.

6. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the power “Off” at the main power disconnect switch and removing the test mode connections.

7. Refer to the individual component test procedures if other components are suspect.

Heating Failure

Verify Heat Failure by Ignition Module (IGN) LED indicator:

• OFF: No Power or Failure

• ON: Normal

• Slow Flash: Normal, Heat Call

• Fast Flash: Error Code:

1 Flash: No Communication

2 Flashes: System Lockout

3 Flashes: Pressure Switch Fail

4 Flashes:TC01 orTC02 Open

5 Flashes: Flame w/o Gas Valve

6 Flashes: Flame Rollout Open

Cooling Failure

• Cooling and heating set point (slide pot) on the thermostat has failed.

• CC1 or CC2 24 VAC control circuit has opened, check CC1 & CC2 coils, and any of the controls below that apply to the unit (HPC1, HPC2, LPC1, LPC2, Frostat™).

Resetting Cooling and Ignition Lockouts

Cooling Failures and Ignition Lockouts are reset in an identical manner. Method 1 explains resetting the system from the space; Method 2 explains resetting the system at the unit.

Method 1

To reset the system from the space, turn the “Mode”

selection switch at the thermostat to the “Off” position.

After approximately 30 seconds, turn the “Mode”

selection switch to the desired mode, i.e. Heat, Cool or

Auto.

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Troubleshooting

Method 2

To reset the system at the unit, cycle the unit power by

turning the disconnect switch “Off” and then “On”.

Table 19. Fault detection and diagnostic codes

Primary Fault Codes Information Code

Mixed Air

Failures

Damper stuck at Minimum

Damper Stuck Open

Mixed Sensor Failure

Supply Air Sensor Failure

Outdoor Air Temperature Fail

Power loss to RTEM

Failed or Power Loss to Actuator

Mechanical Failure of Actuator

(a)If goes out of range.

Temp

Sensor

Fail

Outdoor

Temp

Sensor

Fail

Economizer

Actuator

Fault

Comm

RTEM

Fail

Pressure

Dead band

Fail

(If Used)

X X

(a)

Temp

Sensor

Fail

(If Used)

Sensor Fail

(If Used)

Airflow

(a)

Space

Press Dead

band Fail (If Used)

(a)

Unit Fails

Economize

Unit

Economizing

When It

Should Not

Damper

Position %

Indicated

Table 20. Low leak economizer sensor values

Temp °F

40 26.097 54 17.847 68 12.435 41 25.383 55 17.382 69 12.126 42 24.690 56 16.930 70 11.827 43 24.018 57 16.491 71 11.535 44 23.367 58 16.066 72 11.252 45 22.736 59 15.654 73 10.977 46 22.132 60 15.253 74 10.709 47 21.530 61 14.864 75 10.448 48 20.953 62 14.486 76 10.194 49 20.396 63 14.119 77 9.949 50 19.854 64 13.762 78 9.710 51 19.330 65 13.416 79 9.477 52 18.821 66 13.078 80 9.250 53 18.327 67 12.752 81 9.030

Resistance

(K ohms) Temp °F

Sensor Values Data

Resistance

(K ohms) Temp °F

Resistance

(K ohms)

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Troubleshooting

Unit Economizer Control (ECA)

Test Procedures

Electromechanical Control

This series of tests will allow you to diagnose, and

determine where, and if a problem exists in the system economizer operation.Test 1 determines if the problem is in the Unit, or if it is in the ECA.Test 2 tests sensor inputs.

Test 3 tests the resistors and sensors. Conduct the tests in

numerical order until problem is found.

Test 1

Verifying that the economizer actuator (ECA) is functional:

1. Using the “Test Mode” described in the “System StartUp” section, put the unit into the economizer mode and verify that the economizer actuator (ECA) drives fully open (approximately 90 seconds).

2. If the ECA is not driving the dampers, verify that 24VAC is between the ECA terminalsTR andTR1 is present. If 24 volts is not present, a wiring or terminal problem exists from the control transformer. Make any necessary repairs, see wiring diagrams to troubleshoot.

3. If 24 VAC is present, adjust the minimum position potentiometer fully clockwise. If the actuator does not drive, the economizer actuator is bad. Replace the ECA.

The resistance should be approximately 130 Ohms.

Replace the ECA if it is out of range.

Troubleshooting procedures for

Direct Drive Plenum Fan

Prior to troubleshooting, verify all wiring and wiring connections.The motor has internal protections that will shut down the motor before damage occurs. A power cycle is required to reset some of the internal protections. Before proceeding, powerdown unit for 1minute and then power on.

Please follow steps sequentially unlessdirected differently in solution.

Refer to RT-SVB90*-EN for a Comprehensive

Troubleshooting Guide.

Test 2

Testing the ECA resistors and sensors

1. Testing the Mixed Air Sensor (MAS). Disconnect the wires connected toT andT1 on the ECA, and;

a. Measure the resistance of the sensor between the

wires 180B and 181B.

b. Measure the temperature at the MAS location.

Using theTemperature versus Resistance chart, verify the accuracy of the MAS.

Replace the sensor if it is out of range.

2. Testing the Outdoor Air Switch. If the temperature is above 60 degrees, it will need to be chilled. Measure the resistance of the sensor on the ECA SO and +.

The resistance should be approximately 390 Ohms.

Replace the Switch if it is open.

Replace the ECA if it is out of range.

3. Testing the R1 Resistance.

Measure the resistance of the sensor on the ECA SR and +.

The resistance should be approximately 420 Ohms.

Replace the ECA if it is out of range.

4. Testing the R2 Resistance.

Measure the resistance of the sensor on the ECA P and P1.

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Unit Wiring Diagrams Numbers

Note: Wiring diagrams can be accessed using e-Library

by entering the diagram number in the literature order number search field or by contacting technical support.

Table 21. Unit wiring diagram numbers

Schematic Type Drawing Number Description

1213-1641 YSC(033-063)G ReliaTel Controls 4366-7217 YHC(037-067)

4366-4571 4366-1015 Y(S,H)C(036-090)E/F, ReliaTel Controls, Belt-Drive IDM

ReliaTel™

Control 230,460,575V

Electromechanical

4366-4703 4366-1042 YSC(092,102)F, ReliaTel Controls

4366-7436 (YHC074-102,YSC120)F, ReliaTel Controls 4366-7430 YHC120F, ReliaTel Controls 1213-1644 YSC(033-063)G Electromechanical Controls

4366-8386

4366-8383

4366-8387 4366-8385 Y(S,H)C(072,090)F, Electromechanical Controls

4366-8384 YSC(092,102)F, Electromechanical Controls 4366-8388 (YHC074-102,YSC120)F, Electromechanical Controls 4366-8395 YHC120F, Electromechanical Controls

Y(S,H)C(036,048)E/F (1,3 Phase) and YHC060F (1-

Phase), ReliaTel Controls, X13 IDM

YSC060E (1,3 Phase) and YHC060E/F (3-Phase),

ReliaTel Controls, X13 IDM

Y(S,H)C(036,048)E/F (1,3 Phase) and YHC060F (1-

Phase), Electromechanical Controls, X13 IDM

Y(S,H)C(036-060)E/F, Electromechanical Controls,

Belt-Drive IDM

YSC060E (1,3 Phase) and YHC060E/F (3-Phase),

Electromechanical Controls, X13 IDM

Power

Schematic Type Drawing Number Description

1213-1637 YSC(033-063)G3 ReliaTel Controls 4366-7179 YHC(037-067) (230V) 4366-4576 Y(S,H)C(036-060)E/F (1-Phase)

230V

ReliaTel™

460V and/or 575V

230V

Electromechanical

460V and/or 575V

4366-5163 YHC(036-060)E/F (230V 3-Phase), X13 IDM 4366-1016 Y(S,H)C(036-090)E/F (230V 3-Phase), Belt-Drive IDM 4366-1033 YSC(092,102)F (230V) 4366-7437 (YHC074-102, YSC120)F (230V), ReliaTel Controls 4366-7430 YHC120F, ReliaTel Controls 1213-1638 YSC(033-063)G4 ReliaTel Controls 1213-1662 YSC(033-063)GW ReliaTel Controls 4366-7180 YHC(037-067) (460V) 4366-5164 YHC(036-060)E/F (460V), X13 IDM 4366-1005 Y(S,H)C(036-090)E/F (460V,575V), Belt-Drive IDM 4366-1034 YSC(092,102)F (460V,575V) 4366-7438 (YHC074-102, YSC120)F (460V), ReliaTel Controls 4366-7439 YSC120F (575V), ReliaTel Controls 4366-7430 YHC120F, ReliaTel Controls 1213-1637 YSC(033-063)G3 Electromechanical Controls 4366-6406 YHC120F, Electromechanical Controls 4366-6449 YHC(074-102)F, YSC120F, Electromechanical Controls 1213-1638 YSC(033-063)G4 Electromechanical Controls 1213-1662 YSC(033-063)GW Electromechanical Controls 4366-1005 Y(S,H)C(036-090)E/F (460V,575V), Belt-Drive IDM 4366-1005 Y(S,H)C(036-090)E/F (460V,575V), Belt-Drive IDM 4366-6406 YHC120F, Electromechanical Controls 4366-6436 YHC(074-102)F4, Electromechanical Controls 4366-6782 YSC(120)FW, Electromechanical Controls

70 RT-SVX21U-EN

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Table 21. Unit wiring diagram numbers (continued)

Schematic Type Drawing Number Description

230V

ReliaTel™

Connection

Electromechanical

460V and/or 575V

230V

460V and/or 575V

Unit Wiring Diagrams Numbers

1213-1672 YSC(033-063)G3 ReliaTel Controls 4366-7340 YHC(037) (230V) 4366-8247 YHC037E (230V), 17 Plus with Multi-Zone VAV 4366-7342 YHC(047-067) (230V) 4366-8249 YHC(047, 067)E (230V), 17 Plus with Multi-Zone VAV

4366-4564

4366-5185

4366-1522 4366-4705 YSC060E (1-Phase), ReliaTel Controls

4366-5186 YHC060E/F (230V 3-Phase), ReliaTel Controls, X13 IDM 4366-1539 Y(S,H)C(072,090)F (230V), ReliaTel Controls 4366-7449 YHC120F (3-Phase), ReliaTel Controls 4366-8254 YHC(074-120)F ReliaTel Controls, with Multi-Zone VAV 4366-1530 YSC(092,102)F (230V), ReliaTel Controls 4366-7451 (YSC120,YHC074-102)F (230V), ReliaTel Controls

4366-8255 1213-1674 YSC(033-064)G4 ReliaTel Controls

12313-1676 YSC(033-063)GW ReliaTel Controls

4366-8254 YHC120F ReliaTel Controls, with Multi-Zone VAV 4366-7341 YHC(037) (460V) 4366-8248 YHC037E (460V), 17 Plus with Multi-Zone VAV 4366-7343 YHC(047-067) (460V) 4366-8250 YHC(047,067)E (460V), 17 Plus with Multi-Zone VAV 4366-5202 YHC(036,048)E/F (460V), ReliaTel Controls, X13 IDM

4366-1516 4366-5203 YHC060E/F (460V), ReliaTel Controls, X13 IDM

4366-1540 Y(S,H)C(072,090)F (460V,575V), ReliaTel Controls 4366-1532 YSC(092,102)F (460V,575V), ReliaTel Controls 4366-7454 (YSC120,YHC074-102)F (460V), ReliaTel Controls

4366-8256 4366-7456 YSC120F (575V), ReliaTel Controls

4366-8257 YSC120F (575V), ReliaTel Controls with Multi-Zone V AV 1213-1673 YSC(033-036)G3 Electromechanical Controls

4366-8390

4366-8392

4366-8404 4366-8391 YSC060E (1-Phase), Electromechanical Controls 4366-8393 4366-8408 Y(S,H)C(072,090)F (230V), Electromechanical Controls

4366-8403 YHC120F (3-Phase), Electromechanical Controls 4366-8406 YSC(092,102)F (230V), Electromechanical Controls

4366-8400 1213-1675 YSC(033-063)G4 Electromechanical Controls

1213-1677 YSC(033-063)GW Electromechanical Controls 4366-8394

4366-8405

Y(S,H)C(036,048)E/F, YHC060F (1-Phase), ReliaTel

Controls

YHC(036,048)E/F (230V 3-Phase), ReliaTel Controls,

X13 IDM

Y(S,H)C(036-060)E/F (230V 3-Phase), ReliaTel

Controls, Belt-Drive IDM

YHC(074-102)F , YSC120F (230V), ReliaT el Controls with

Multi-Zone VAV

Y(S,H)C(036-060)F (460V,575V), ReliaTel Controls,

Belt-Drive IDM

YHC(074-102)F , YSC120F (460V), ReliaT el Controls with

Multi-Zone VAV

Y(S,H)C(036,048)E/F, YHC060F (1-Phase),

Electromechanical Controls

YHC(036,048)E/F (230V 3-Phase), Electromechanical

Controls, X13 IDM

Y(S,H)C(036-060)E/F (230V 3-Phase),

Electromechanical Controls, Belt-Drive IDM

YHC060E/F (230V 3-Phase), Electromechanical

Controls, X13 IDM

(YSC120,YHC074-102)F (230V), Electromechanical

Controls

YHC(036,048)E/F (460V), Electromechanical Controls,

X13 IDM

Y(S,H)C(036-060)E/F (460V ,575V), Electromechanical

Controls, Belt-Drive IDM

RT-SVX21U-EN 71

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Unit Wiring Diagrams Numbers

Table 21. Unit wiring diagram numbers (continued)

Schematic Type Drawing Number Description

Connection Electromechanical

460V and/or 575V

4366-8399

4366-8389

4366-8407

4366-8401 4366-8402 YSC120F (575V), Electromechanical Controls

YHC060E/F (460V), Electromechanical Controls, X13

IDM

Y(S,H)C(072,090)F (460V,575V), Electromechanical

Controls

YSC(092,102)F (460V,575V), Electromechanical

Controls

(YSC120,YHC074-120)F (460V), Electromechanical

Controls

72 RT-SVX21U-EN

Page 73

Limited Warranty

Combination Gas Electric Air Conditioner

YCD,YCH,YSC and YHC (Parts Only)

Models Less Than 20 Tons for Commercial Use*

This warranty is extended byTrane to the original

purchaser and to any succeeding owner of the real property to which the Combination Gas Electric Air Conditioner is originally affixed, and applies to products purchased and retained for use within the U.S.A. and Canada.There is no warranty against corrosion, erosion or deterioration.

If any part of your Combination Gas Electric Air Conditioner fails becauseof a manufacturingdefect within one year from the date of the original purchase, Warrantor will furnish without charge the required replacement part.

In addition, if the sealed motor-compressor fails because of a manufacturing defect within the second through fifth year from the date of original purchase, Warrantor will furnish without charge the required replacement compressor.

In addition, if the standard aluminized steel heat exchanger fails because of a manufacturing defect within five years from the date of start-up,Warrantor will furnish without charge a replacement heat exchanger. Any local transportation, related service labor and diagnosis calls are not included.

In addition, if theoptional, factory installed, stainless steel heat exchanger fails because of a manufacturing defect within ten years from the date of start-up, Warrantor will furnish without charge a replacement heat exchanger. Any local transportation, related service labor and diagnosis calls are not included.

Warrantor’s obligations and liabilities under this warranty

are limited to furnishing F.O.B. Warrantor factory or warehouse at Warrantor designated shipping point,

freight allowed to Buyer’s city, replacement parts for Warrantor’s products covered under this warranty. Warrantor shall not be obligated to pay for the cost of lost

refrigerant. No liability shall attach to Warrantor until

products have been paid for and then liability shall be

limited solely to the purchase price of the equipment

under warranty shown to be defective.

THEWARRANTYAND LIABILITY SET FORTH HEREINARE

IN LIEU OF ALL OTHER WARRANTIES AND LIABILITIES, WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS

OR IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

PARTICULAR USE, AND IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR

CONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Trane

2701 Wilma Rudolph Blvd.

Clarksville,TN 37040-1008

Attention: Manager, Product Service

GW-606-4800

*This warranty is for commercial usage of said equipment and not applicable when the equipment is used for a residential application. Commercial use is any application where the end purchaser uses the product for other than personal, family or household purposes.

**A 5 year limited warranty is provided for the optional "Low Leak" economizer when combined with the additional FDD (Fault Detection & Diagnostics) option.

RT-SVX21U-EN 73

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Ingersoll Rand (NYSE:IR) advances the quality of life by creating comfortable, sustainable and efficient environments. Our people and our family of brands—including Club Car®, Ingersoll Rand®,Thermo King® andTrane®—work together to enhance the quality and comfort of air in homes and buildings; transport and protect food and perishables; and increase industrial productivity and efficiency. We are a global business committed to a world of sustainable progress and enduring results. For more information, visit www.ingersollrand.com.

Ingersoll Rand has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

RT-SVX21U-EN 06 May 2016

Supersedes RT-SVX21T-EN (06 Nov 2015)

We are committed to using environmentally

conscious print practices that reduce waste.

Ingersoll Rand YSC072F, YSC120F, YSC060G, YSC063G, YSC036 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Table of Contents

Model Number Descriptions-3to10Tons(T/Y)

Model Number Notes

Model Number Descriptions-3to5Tons(T/Y - 17 Plus)

Model Number Notes

General Information

Unit Inspection

Storage

Unit Nameplate

Compressor Nameplate

Microchannel Coil Barcode ID

Unit Description

Economizer Control Actuator (Optional)

System Input Devices & Functions

Low Pressure Control

High Pressure Control

Power Exhaust Control (Optional)

Lead/Lag Control (Dual Circuit Only)

Evaporator Frost Control

Discharge Line Temp Switch (DLTS)

Smoke Detector Sensor (Optional)

Phase Monitor

Single Zone Variable Air Volume / Displacement Ventilation (Optional)

Unit Dimensions

Installation

Pre-Installation

Procedure

Foundation

Horizontal Units

Ductwork

Roof Curb

Downflow

Rigging

General Unit Requirements

Factory Installed Economizer

Horizontal Discharge Conversion (3 to 5 Ton Units)

TCO1 Instructions

Horizontal Discharge Conversion (6 to 10Ton Units)

TCO1 Instructions

Return Air Smoke Detector

Main Electrical Power Requirements

Requirements for Gas Heat

Condensate Drain Configuration

Filter Installation

Field Installed Power Wiring

Main Unit Power

Standard Wiring

Optional TBUE Wiring (Through-the-Base Electrical Option)

Control PowerTransformer

Field-Installed Control Wiring

Controls Using 24 VAC

DC Conductors

Controls using DC Analog Input/Outputs (Standard Low Voltage Multi conductor Wire)

Space Temperature Averaging (ReliaTel™ Only)

Pre-Start

Voltage Imbalance

Electrical Phasing (Three Phase Motors)

Compressor Crankcase Heaters (Optional)

ReliaTel™ Controls

Test Modes

ReliaTel™ Controls

Electromechanical Controls Test Procedure

Unit Start-Up

Verifying Proper Air Flow

Units with 5-Tap Direct Drive Indoor Fan

Units with Belt Drive Indoor Fan

ReliaTel™ Units with Direct Drive Indoor Fan (10Tons Standard Efficiency, 6(074) to 10 Tons High Efficiency)

Units with Constant CFM Direct Drive Indoor Fan

17 Plus units with the constant CFM direct drive indoor fan

Supply Duct Static Pressure Control

Traditional VAV Standalone Operation

Supply AirTemperature Reset

Return Air Smoke Detector

Economizer Start-Up

Compressor Start-Up