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

...

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

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

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

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

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

RT-SVX21U-EN 5

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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)

RT-SVX21U-EN 23

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