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

Installation, Operation,

and Maintenance

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

3 to 10Tons – 60 Hz

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

SAFETY WARNING

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

May 2016

RT-SVX21U-EN

Introduction

Read this manual 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

CAUTIONs

NOTICE

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

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

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

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

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.

Copyright

This document and the information in it are the property of 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

© 2016 Ingersoll Rand All rights reserved

RT-SVX21U-EN

Introduction

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

RT-SVX21U-EN

3

Table of Contents

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

6

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
Procedure . . . . . . . . . . . . . . . . . . . . . . . .	. . . 24
Foundation . . . . . . . . . . . . . . . . . . . . . . .	. . . 26
Horizontal Units . . . . . . . . . . . . . . . . .	. . . 26
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 27
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . .	. . . 28
Downflow . . . . . . . . . . . . . . . . . . . . . .	. . . 28
Rigging . . . . . . . . . . . . . . . . . . . . . . . .	. . . 29
General Unit Requirements . . . . . . . . .	. . . 29

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™ On-
ly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	44
Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	47
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

4	RT-SVX21U-EN

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 - Electromechanical 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

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

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

System Status Checkout Procedure . . . . . 63

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

Resetting Cooling and Ignition Lockouts 65

Zone Temperature Sensor (ZTS) Service Indi-
cator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65

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) Default 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

RT-SVX21U-EN

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

Digit 1 - Unit Type

T DX Cooling

Y DX Cooling, Gas Heat

Digit 2 - 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	8½Ton
120	10Ton

Digit 7 - Major Design Sequence

ER-410A Refrigerant

FMicrochannelType Condenser Coils24

GMicrochannelType Evaporator and Condenser Coils

Digit 8 - Voltage Selection

1 208/230/60/1

3208-230/60/3

4460/60/3 W 575/60/3

Digit 9 - Unit Controls

E	Electromechanical
R	ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

Note: Applicable to Digit 1,T models only

0 No Electric Heat

A5 kW (1 phase)1

B6 kW (3 phase)

C9 kW (3 phase)

D10 kW (1 phase)1

E12 kW (3 phase)

F14 kW (1 phase)1

G18 kW (1&3 phase)

J23 kW (3 phase)

K27 kW (3 phase)

N36 kW (3 phase)

P54 kW (3 phase)

Note: Applicable to Digit 1,Y models only

LLow Heat

MMedium Heat

HHigh Heat

XLow Heat, Stainless Steel Heat Exchanger

YMedium Heat, Stainless Steel Heat Exchanger

ZHigh Heat, Stainless Steel Heat Exchanger

Digit 11 - Minor Design

Sequence

AFirst Sequence21

BSecond Sequence20

Digit 12,13 - Service Sequence

** Factory Assigned

Digit 14 - Fresh Air Selection

0 No Fresh Air

AManual Outside Air Damper 0-50%4

BMotorized Outside Air Damper 0-50%29

CEconomizer, Dry Bulb 0-100% without Barometric Relief7

DEconomizer, Dry Bulb 0-100% with Barometric Relief7

EEconomizer, Reference Enthalpy

0-100% without Barometric Relief3,7

FEconomizer, Reference Enthalpy 0-100% with Barometric Relief3,7

GEconomizer, Comparative Enthalpy 0-100% without Barometric Relief3,7

HEconomizer, Comparative Enthalpy 0-100% with Barometric Relief3,7

KLow Leak Economizer with Barometric Relief

MLow Leak Economizer with Reference Enthalpy with Barometric Relief

PLow Leak Economizer with Comparative Enthalpy with Barometric Relief

Digit 15 - Supply Fan/Drive Type/

Motor

0Standard Drive6

1Oversized Motor

2Optional Belt Drive Motor18

6Single Zone VAV27,34

7Multi-Speed Indoor Fan28

E VAV Supply AirTemperature Control Standard Motor34

Digit 16 - Hinged Service

Access/Filters

0 Standard Panels/Standard Filters

AHinged Access Panels/Standard Filters

BStandard Panels/2” MERV 8 Filters

CHinged Access Panels/2” MERV 8 Filters

DStandard Panels/2” MERV 13 Filters

EHinged Access Panels/2” MERV 13 Filters

Digit 17 - Condenser Coil

Protection

0Standard Coil

1Standard Coil with Hail Guard

2Black Epoxy Pre-Coated Condenser Coil26

3Black Epoxy Pre-Coated

Condenser Coil with Hail Guard26

4CompleteCoat™ Condenser Coil

5CompleteCoat™ Condenser Coil with Hail Guard

Digit 18 - Through-the-Base

Provisions

Note: Applicable to Digit 1,T orY models

0 NoThrough-the-Base Provisions A Through-the-Base Electric8

Note: Applicable to Digit 1,Y models only

BThrough-the-Base Gas Piping16

CThrough-the-Base Electric and Gas Piping16

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

0No Disconnect/No Circuit Breaker

1Unit Mounted Non-Fused Disconnect8

2Unit Mounted Circuit Breaker8

Digit 20 - Convenience Outlet

0 No Convenience Outlet

AUnpowered Convenience Outlet

BPowered Convenience Outlet (three-phase only)9

Digit 21 - Communications

Options3

0No Communications Interface

1Trane® Communications Interface

2LonTalk® Communications Interface

3Novar 2024 Controls31

4Novar 3051 Controls without Zone Sensor31

5Novar 3051Controls Interface with DCV31

6BACnet® Communications Interface

7Air-Fi™ Wireless Communications35

Digit 22 - Refrigeration System

Option

0 Standard Refrigeration System10

B Dehumidification Option22,23

Digit 23 - Refrigeration Controls

Note: Applicable to Digit 7 = E, F, G

0No Refrigeration Control5

1Frostat™11,30

2Crankcase Heater2

3Frostat™11,30 and Crankcase Heater2

Digit 24 - Smoke Detector17

0 No Smoke Detector

AReturn Air Smoke Detector12,13

BSupply Air Smoke Detector

CSupply and Return Air Smoke Detectors12,13

DPlenum Smoke Detector

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

Digit 25 - System Monitoring

Controls

0No Monitoring Control14

1Clogged Filter Switch14

2Fan Failure Switch14

3Discharge Air SensingTube14

4Clogged Filter Switch and Fan Failure Switch14

5Clogged Filter Switch and Discharge Air SensingTube14

6Fan Failure Switch and Discharge Air SensingTube14

7Clogged Filter Switch, Fan Failure

Switch and Discharge Air SensingTube14

8Novar Return Air Sensor (NOVAR 2024)15,31

9Novar ZoneTemp Sensor (NOVAR 3051)19,31

ACondensate Drain Pan Overflow Switch

BClogged Filter Switch14 and Condensate Drain Pan Overflow Switch

CFan Failure Switch14 and Condensate Drain Pan Overflow Switch

DDischarge Air Sensing14 and Condensate Drain Pan Overflow Switch

EClogged Filter Switch14, Fan Failure Switch14 and Condensate Drain Pan Overflow Switch

FClogged Filter Switch14, Discharge Air SensingTube14 and Condensate Drain Pan Overflow Switch

GFan Failure Switch, Discharge Air SensingTube14 and Condensate Drain Pan Overflow Switch

HClogged Filter Switch14, Fan Failure Switch14, Discharge Air Sensing14 and Condensate Drain Pan Overflow Switch

Digit 26 - System Monitoring

Controls

0 No Monitoring Controls

ADemand Control Ventilation (CO2)32,33

BLow Leak Economizer with FDD (Fault Detection & Diagnostics)

CFDD (Fault Detection & Diagnostics) with DCV (Demand Control Ventilation)

Digit 27 - Unit Hardware

Enhancements

0No Enhancements

1Stainless Steel Drain Pan

Digit 31 - Advanced Unit

Controls

0Standard Unit Controls

1Human 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 pressure control is standard 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 Ton) = Multispeed Direct Drive Motor

3 Phase (6 to 8½ Ton) = Belt Drive

3 Phase (10 Ton) = 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 must be 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 Tons 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 fit up 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

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Model Number Descriptions - 3 to 10 Tons (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 zone VAV 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 with SZVAV products.

32.Demand control ventilation not available with electromechanical controls.

33.Demand control ventilation option includes wiring only.The C02 sensor is a field-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 used with BACnet® open protocol.

8	RT-SVX21U-EN

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

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

Digit 1 - Unit Type

T DX Cooling

Y DX Cooling, Gas Heat

Digit 2 - 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

3208-230/60/3

4460/60/3 W 575/60/3

Digit 9 - Unit Controls

R ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

Note: Applicable to Digit 1,T models only

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 only

LLow Heat

MMedium Heat

HHigh Heat

XLow Heat, Stainless Steel Heat Exchanger

YMedium Heat, Stainless Steel Heat Exchanger

ZHigh Heat, Stainless Steel Heat Exchanger

Digit 11 - Minor Design

Sequence

A First Sequence16

Digit 12,13 - Service Sequence

** Factory Assigned

RT-SVX21U-EN

Digit 14 - Fresh Air Selection

0 No Fresh Air

AManual Outside Air Damper 0-50%2

BMotorized Outside Air Damper 0-50%

CEconomizer, Dry Bulb 0-100% without Barometric Relief5

DEconomizer, Dry Bulb 0-100% with Barometric Relief5

EEconomizer, Reference Enthalpy 0-100% without Barometric Relief5

FEconomizer, Reference Enthalpy 0-100% with Barometric Relief5

GEconomizer, Comparative

Enthalpy 0-100% without Barometric Relief5

HEconomizer, Comparative

Enthalpy 0-100% with Barometric Relief5

KLow Leak Economizer with Barometric Relief

MLow Leak Economizer with Reference Enthalpy with Barometric Relief

PLow Leak Economizer with Comparative Enthalpy with Barometric Relief

Digit 15 - Supply Fan/Drive Type/

Motor

0 Standard Drive4

6 Single Zone VAV34

EVAV Supply AirTemperature Control Standard Motor34

Digit 16 - Hinged Service

Access/Filters

0 Standard Panels/Standard Filters

AHinged Access Panels/Standard Filters

BStandard Panels/2” MERV 8 Filters

CHinged Access Panels/2” MERV 8 Filters

DStandard Panels/2” MERV 13 Filters

EHinged Access Panels/2” MERV 13 Filters

Digit 17 - Condenser Coil

Protection

0Standard Coil

1Standard Coil with Hail Guard

2Black Epoxy Pre-Coated Condenser Coil

3Black Epoxy Pre-Coated Condenser Coil with Hail Guard

4CompleteCoat™ Condenser Coil

5CompleteCoat™ Condenser Coil with Hail Guard

Digit 18 - Through the Base

Provisions

0 NoThrough-the-Base Provisions

AThrough-the-Base Electric6

BThrough-the-Base Gas Piping13

CThrough-the-Base Electric and Gas Piping13

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

0No Disconnect/No Circuit Breaker

1Unit Mounted Non-Fused Disconnect6

2Unit Mounted Circuit Breaker6

Digit 20 - Convenience Outlet

0 No Convenience Outlet

AUnpowered Convenience Outlet

BPowered Convenience Outlet (three-phase only)7

Digit 21 - Communications

Options

0 No Communications Interface

2LonTalk® Communications Interface

3Novar 2024 Controls

4Novar 3051 Controls without Zone Sensor

5Novar 3051Controls Interface with DCV

6BACnet® Communications Interface

7Air-Fi™ Wireless Communications22

Digit 22 - Refrigeration System

Option

0 Standard Refrigeration System8

B Dehumidification Option17

Digit 23 - Refrigeration Controls

Note: Applicable to Digit 7 = E

0No Refrigeration Control3

1Frostat™

2Crankcase Heater1

3Frostat and Crankcase Heater1

Digit 24 - Smoke Detector14

0 No Smoke Detector

AReturn Air Smoke Detector9,10

BSupply Air Smoke Detector

CSupply and Return Air Smoke Detectors9,10

DPlenum Smoke Detector

Digit 25 - System Monitoring

Controls

0No Monitoring Control11

1Clogged Filter Switch11

2Fan Failure Switch11

3Discharge Air SensingTube11

4Clogged Filter Switch and Fan

Failure Switch11

5Clogged Filter Switch and Discharge Air SensingTube11

6Fan Failure Switch and Discharge Air SensingTube11

7Clogged Filter Switch, Fan Failure

Switch and Discharge Air SensingTube11

9

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

8Novar Return Air Sensor (NOVAR 2024)12,20

9Novar ZoneTemp Sensor (NOVAR 3051)15,20

ACondensate Drain Pan Overflow Switch

BClogged Filter Switch11 and Condensate Drain Pan Overflow Switch

CFan Failure Switch11 and Condensate Drain Pan Overflow Switch

DDischarge Air Sensing11 and Condensate Drain Pan Overflow Switch

EClogged Filter Switch11, Fan Failure Switch11 and Condensate Drain Pan Overflow Switch

FClogged Filter Switch11, Discharge Air SensingTube11 and Condensate Drain Pan Overflow Switch

GFan Failure Switch11, Discharge Air SensingTube11 and Condensate Drain Pan Overflow Switch

HClogged Filter Switch11, Fan Failure Switch11, Discharge Air Sensing11 and Condensate Drain Pan Overflow Switch

Digit 26 - System Monitoring

Controls

0 No Monitoring Controls

ADemand Control Ventilation (CO2)18,19

BLow Leak Economizer with FDD (Fault Detection & Diagnostics)

CFDD (Fault Detection & Diagnostics) with DCV (Demand Control Ventilation)

Digit 27 - Unit Hardware

Enhancements

0No Enhancements

1Stainless Steel Drain Pan

Digit 31 - Advanced Unit

Controls

0Standard Unit Controls

1Human 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 control is 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 must be 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 fit up 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.

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 CO2 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 used with 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 type and extent of the 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 for the compressors are located on 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 coils are 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 in response 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 mixed air 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, CO2 setpoint, CO2, and ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity against ambient humidity) sensors, if selected, to control dampers to an accuracy of

RT-SVX21U-EN

11

General Information

	+/- 5% of stroke.The actuator is spring returned to the	Supply Fan Failure Input (Optional)
	closed position any time that power is lost to the unit. It is	The Fan Failure Switch can be connected to sense indoor
	capable of delivering up to 25 inch pounds of torque and
		fan operation:
	is powered by 24 VAC.
		FFS (Fan Failure Switch) If air flow through the unit is not
	RTCI - ReliaTel™ Trane Communication
		proven by the differential pressure switch connected to the
	Interface (Optional)	RTOM (factory set point 0.07 “w.c.) within 40 seconds
	This module is used when the application calls for an	nominally, the RTRM will shut off all mechanical
		operations, lock the system out, send a diagnostic to ICS,
	ICSTM building management type control system. It
		and the SERVICE output will flash.The system will remain
	allows the control and monitoring of the system through
		locked out until a reset is initiated either manually or
	an ICS panel.The module can be ordered from the factory
		through ICS.
	or ordered as a kit to be field installed. Follow the
	installation instruction that ships with each kit when field	Clogged Filter Switch (Optional)
	installation is necessary.	The unit mounted clogged filter switch monitors the
	RLCI - ReliaTel™ LonTalk® Communication
		pressure differential across the return air filters. It is
	Interface (Optional)	mounted in the filter section and is connected to the
	This module is used when the application calls for an	RTOM. A diagnostic SERVICE signal is sent to the remote
		panel if the pressure differential across the filters is at least
	ICSTM building management type control system that is
		0.5" w.c.The contacts will automatically open when the
	LonTalk. It allows the control and monitoring of the system
		pressure differential across the filters decreases to
	through an ICS panel.The module can be ordered from the
		approximately 0.4" w.c.The clogged filter output is
	factory or ordered as a kit to be field installed. Follow the
		energized when the supply fan is operating and the
	installation instruction that ships with each kit when field
		clogged filter switch has been closed for at least 2 minutes.
	installation is necessary.
		The system will continue to operate regardless of the
	RBCI - ReliaTel™ BACnet Communications	status of the filter switch.
	Interface (Optional)	Note: On units equipped with factory installed MERV 13
	This module is used when the application calls for an open	filters, a clogged filter switch with different
		pressure settings will be installed.This switch will
	BACnet protocol. It allows the control and monitoring of
		close when the differential pressure is
	the system through an ICS panel.The module can be
		approximately 0.8' w.c. and open when the
	ordered from the factory or as a kit to be field installed.
		differential falls to 0.7" w.c.
	Follow the installation instructions that ships with each kit
	when field installation is necessary.	Condensate Drain Pan Overflow Switch
	RTOM - ReliaTel™ Options Module (Standard	(Optional)
	on 17 Plus, 6Ton (074), 7.5 Ton & 8.5 Ton High	ReliaTel™ Option
	Efficiency with ReliaTel, 10 Ton with ReliaTel)	This input incorporates the Condensate Overflow Switch
	The RTOM monitors the supply fan proving, clogged filter,
		(COF) mounted on the drain pan and the ReliaTel Options
	supply air temperature, exhaust fan setpoint, supply air	Module (RTOM). When the condensate level reaches the
	tempering, Frostat™, smoke detector, andVariable Speed	trip point for 6 continuous seconds, the RTOM will shut
	Fan Control (17 Plus units only). Refer to system input	down all unit functions until the overflow condition has
	devices and functions for operation.	cleared.The unit will return to normal operation after 6
	System Input Devices & Functions	continuous seconds with the COF in a non-tripped
		condition. If the condensate level causes unit shutdown
	The RTRM must have a zone sensor or thermostat input in	more than 2 times in a 3 days period, the unit will be
		locked-out of operation requiring manual reset of
	order to operate the unit.The flexibility of having several
		diagnostic system through Zone Sensor or Building
	mode capabilities depends upon the type of zone sensor or
		Automation System (BAS). Cycling unit power will also
	thermostat selected to interface with the RTRM.
		clear the fault.
	The descriptions of the following basic Input Devices used
		Electromechanical Option
	within the RTRM network are to acquaint the operator with
	their function as they interface with the various modules.	This input incorporates the condensate overflow switch
	Refer to the unit’s electrical schematic for the specific
		(COF), COF Relay, COFTime Delay. When the condensate
	module connections.
		level reaches the trip point, the COF relay energizes and
	The following controls are available from the factory for
		opens the 24VAC control circuit which disables the unit.
	field installation.	Once the 24VAC control circuit is opened, a delay 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 wired in 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.

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

Zone Sensor (BAYSENS110*)

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

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 be selected for relative humidity levels between

RT-SVX21U-EN

13

General Information

	40% and 60% by adjusting the DEHUMID setting on the	Remote Zone Sensor (BAYSENS016*)
	ReliaTel Options Module. See Figure 45, p. 40.	This bullet type temperature sensor can be used for
	Duct Mounted Relative Humidity Sensor
		outside air (ambient) sensing, return air temperature
	(BAYSENS037*)	sensing, supply air temperature sensing, remote
	Field installed, duct mounted humidity sensor is used to	temperature sensing (uncovered).Wiring procedures vary
		according to the particular application and equipment
	control activation of Enhanced Dehumidification and the
		involved. Refer to the unit’s wiring diagrams for proper
	hot gas reheat dehumidification options. Humidity set
		connections.
	points can be selected for relative humidity levels between
		Remote Zone Sensor (BAYSENS077*)
	40% and 60% by adjusting the DEHUMID setting on the
	ReliaTel Options Module. See Figure 45, p. 40.	This electronic sensor can be used with BAYSENS106*,
	Programmable Zone Sensor - (BAYSENS119*)	108*, 110*, 119* Remote Panels.When this sensor is wired
	This 7 day programmable sensor features 2, 3 or 4 periods	to a BAYSENS119* Remote Panel, wiring must be 18 AWG
		ShieldedTwisted Pair (Belden 8760 or equivalent). Refer to
	for Occupied or Unoccupied programming per day. If the
		the specific Remote Panel for wiring details.
	power is interrupted, the program is retained in
		Wireless Zone Sensor (BAYSENS050*)
	permanent memory. If power is off for an extended period
	of time, only the clock and day may have to be reset.	This electronic sensor features five system settings (Auto,
	The Zone Sensor allows selection of 2, 3 or 4 system	Off, Cool, Heat, and Emergency Heat) and with On and
	modes (Heat, Cool, Auto, and Off), two fan modes (On and	Auto fan settings. It is a manual or auto changeover control
	Auto). It has dual temperature selection with	with dual setpoint capability. Other features include a
	programmable start time capability.	timed override function, lockable system settings, and
	The occupied cooling set point ranges between 45 and 98	Fahrenheit or Celsius temperature display. Included with
		the wireless zone sensor will be a receiver that is to be
	º F.The heating set point ranges between 43 and 96ºF.
		mounted inside the unit, a mounting bracket, and a wire
	A liquid crystal display (LCD) displays zone temperature,
		harness.
	temperature set points, day of the week, time, and
		Electromechanical Control
	operational mode symbols.
	The Option Menu is used to enable or disable applicable	The unit must have a thermostat to operate.
	functions, i.e.; Morning Warm-up, Economizer minimum	•	BAYSTAT151
	position override during unoccupied status, Fahrenheit or
			• Single Stage - 1 Heat/1 Cool
	Centigrade, Supply air tempering, Remote zone
	temperature sensor, 12/24 hour time display, Smart fan,	•	BAYSTAT155
	and Computed recovery.		• Multi Stage - 3 Heat/2 Cool - Can be Used for
	During an occupied period, an auxiliary relay rated for 1.25
			Economizer Operation
	amps @ 30 volts AC with one set of single pole double	•	BAYSENS150
	throw contacts is activated.
			• Multi stage - 3 Heat/2 Cool Programmable
	Status Inputs (4 Wires Optional)
			Thermostat
	The ZSM can be wired to receive four (4) operating status	High Temperature Sensor (BAYFRST001*)
	signals from the RTRM (HEAT, COOL, SYSTEM “ON”,	This sensor connects to the RTRM Emergency Stop Input
	SERVICE).
	Four (4) wires from the RTRM should be connected to the	on the LTB and provides high limit “shutdown” of the unit.
		The sensor is used to detect high temperatures due to a
	appropriate terminals (7, 8, 9 & 10) on the ZSM.
		high thermal event in the air conditioning or ventilation
	Remote Zone Sensor (BAYSENS073*)	ducts.The sensor is designed to mount directly to the
	This electronic sensor features remote zone sensing and	sheet metal duct. Each kit contains two sensors.The return
		air duct sensor (X1310004001) is set to open at 135ºF.The
	timed override with override cancellation. It is used with a
		supply air duct sensor (X1310004002) is set to open at
	Trane Integrated Comfort™ building management
		240ºF.The control can be reset after the temperature has
	system.
		been lowered approximately 25ºF below the cutout
	Remote Zone Sensor (BAYSENS074*)	setpoint.
	This electronic sensor features single setpoint capability	Evaporator Frost Control
	and timed override with override cancellation. It is used	ReliaTel™ Option
	with aTrane Integrated Comfort™ building management
	system.	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 the compressor 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 provides high limit“shutdown” of the unit 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 is not 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 inch ColorTouchscreen Human 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 unit capacity, and peak operating efficiency.

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.

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.

End to End

Note 2, 3

6’0” 7’0” 1829 MM 2134 MM

3’0”
914 MM	4’0”
	1219 MM
Note 1
Single Unit	3’0”
	914 MM
	3’0”
	914 MM

Note 4

12 1/2”

12”

16 3/4”

9 1/8”

318 MM

305 MM

426 MM

232 MM

YSC033-063G & YHC036, YHC037E Units

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

16	RT-SVX21U-EN

Unit Dimensions

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

TOP PANEL

CONDENSER FAN

40 7/8”

1038 MM

CONDENSER COIL

UNIT CONTROL WIRE 20 1/4” 7/8” (22 MM) DIA. HOLE

514 MM SERVICE GAUGE PORT ACCESS

1 3/8” (35 MM) DIA. HOLE

69 7/8”	42 1/4”		4 1/4”
			108 MM
	1073 MM			UNIT CONTROL WIRE
1749 MM			5 9/16”
				2” (51 MM) DIA. HOLE
		5 5/8”	141 MM
			7 5/8”
		143 MM
			194 MM
		9 5/8”
			44 1/4”
		244 MM
1/2 NPT GAS CONNECTION			1124 MM

CONTROL AND COMPRESSOR

ACCESS PANEL

Figure 3. 3 ton high efficiency

Notes:

1.All dimensions are in inches/millimeters.

2.½ NPT Gas Connection

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Unit Dimensions

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

Note: All dimensions are in inches/millimeters.

44 MM

8 3/8” 213 MM

44 MM

7

1038 MM

1053 MM

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)

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Unit Dimensions

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

Note: All dimensions are in inches/millimeters.

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)

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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)

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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.

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21

Unit Dimensions

Figure 12. 10 ton high efficiency

Notes:

1.All dimensions are in inches/millimeters.

2.½ or ¾ NPT Gas Connection

INDOOR TOP PANEL

OUTDOOR TOP PANEL

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.HOLE

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

63 3/16”

1605 MM

COMPRESSOR ACCESS PANEL

50 7/8”

1292 MM

CONDENSER COIL

Figure 13. 10 ton high efficiency - roof curb

Notes:

1. All dimensions are in inches/millimeters.

		18 1/2”
		(470 MM)
		1”
56 3/8”	34 3/8”	(25 MM)
(1432 MM)	(873 MM)

14” (356 MM)

1 3/4”

(44 MM)

CLE

ARAN

C

(914

CLEARANCE

E

36”

MM)

18”

(

FOR

457

MM)

DOWNFLOW

FOR H

ORIZO

NTAL

6 5/8”

83 7/8”

(168 MM)

(2130 MM)

18 1/2”

80 1/2”

1”

(470 MM)

(2045 MM)

(25 MM)

1”

(25 MM)

34 3/8”

(873 MM)

59 7/8”

(1521 MM)

84 1/2”

(2146 MM) 60 3/8”

(1534 MM)

2” (51 MM)

2” (51 MM)

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Unit Dimensions

Figure 14. 10 ton high efficiencyunit clearance and roof opening

Notes:

1. All dimensions are in inches/millimeters.

99 11/16”

(2532 MM)

63 3/16”

(1605 MM)

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