Trane Voyager 12 5 To 25 Tons Installation And Maintenance Manual Packaged Rooftop Air Conditioners Voyager, Gas/Electric

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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.

Packaged Rooftop Air Conditioners

Voyager™ – Gas/ Electric

12½ – 25 Tons, 60/50Hz

January 2015 RT-SVX26L-EN

Installation, Operation,

and Maintenance

Model Number: YS*150–300

YH*150-300

© 2015 Trane All rights reserved RT-SVX26L-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.

Important

Environmental Concerns!

Scientific research has shown that certain man-made

chemicals can affect the earth’s naturally occurring

stratospheric ozone layer when released to the

atmosphere. In particular, several of the identified

chemicals that may affect the ozone layer are refrigerants

that contain Chlorine, Fluorine and Carbon (CFCs) and

those containing Hydrogen, Chlorine, Fluorine and

Carbon (HCFCs). Not all refrigerants containing these

compounds have the same potential impact to the

environment. Trane advocates the responsible handling of

all refrigerants-including industry replacements for CFCs

such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are

important to the environment, our customers, and the air

conditioning industry. All technicians who handle

refrigerants must be certified. The Federal Clean Air Act

(Section 608) sets forth the requirements for handling,

reclaiming, recovering and recycling of certain

refrigerants and the equipment that is used in these

service procedures. In addition, some states or

municipalities may have additional requirements that

must also be adhered to for responsible management of

refrigerants. Know the applicable laws and follow them.

ATTENT I ON: Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. Read

these carefully:

WARNING Indicates a potentially hazardous

situation which, if not avoided, could

result in death or serious injury.

CAUTIONsIndicates a potentially hazardous

situation which, if not avoided, could

result in minor or moderate injury. It

could also be used to alert against

unsafe practices.

NOTICE: Indicates a situation that could result in

equipment or property-damage only

WARNING

Personal Protective Equipment (PPE)

Required!

Installing/servicing this unit could result in exposure to

electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians

MUST put on all 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.

Failure to follow instructions could result in death or

serious injury.

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Introduction

RT-SVX26L-EN 3

Overview of Manual

Note: One copy of this document ships inside the control

panel of each unit and is customer property. It must

be retained by the unit’s maintenance personnel.

This booklet describes proper installation, operation, and

maintenance procedures for air cooled systems.

By carefully reviewing the information within this manual

and following the instructions, the risk of improper

operation and/or component damage will be minimized.

It is important that periodic maintenance be performed to

help assure trouble free operation. A maintenance

schedule is provided at the end of this manual.

Should equipment failure occur, contact a qualified

service organization with qualified, experienced HVAC

technicians to properly diagnose and repair this

equipment.

Revision Summary

RT-SVX26L-EN (21 Jan 2015)

• Title 24 - ASHRAE 90.1-2013

• Updated Model Number Description, Startup, and

Wiring Diagrams Sections

NOTICE:

Water Damage!

Non-factory penetrations through the base of this unit

are not allowed. Any penetration in the base of the unit

may affect the water tight integrity of the unit and lead

to water leaks into the conditioned space. Failure to

follow instructions could result in equipment and

property damage.

4 RT-SVX26L-EN

Table of Contents

Model Number Description . . . . . . . . . . . . . . . 5

General Information . . . . . . . . . . . . . . . . . . . . . 7

Unit Description . . . . . . . . . . . . . . . . . . . . . . . 7

System Input Devices & Functions . . . . . . . 7

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

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

Unit Clearances . . . . . . . . . . . . . . . . . . . . . . 11

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 12

Unit Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . 19

General Unit Requirements . . . . . . . . . . . . 19

Main Unit Power . . . . . . . . . . . . . . . . . . . . . 21

Space Temperature Averaging . . . . . . . . . 25

Factory-Mounted Unit Options . . . . . . . . . . . 30

Circuit Breaker (FIYUCB) & Unit Disconnect

(FIYUDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Powered and Unpowered Convenience . . 31

Return Air Smoke Detector . . . . . . . . . . . . . 32

Through the Base Gas Utility Option . . . . 35

Pre Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Test Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Verifying Proper Air Flow (Units with Belt

Drive Indoor Fan) . . . . . . . . . . . . . . . . . . . . . 36

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Economizer Start-Up . . . . . . . . . . . . . . . . . . 37

Compressor Start-Up . . . . . . . . . . . . . . . . . 37

Dehumidification Option . . . . . . . . . . . . . . . 38

Heating Start-Up . . . . . . . . . . . . . . . . . . . . . 38

Variable Air Volume Applications (Multi-zone,

Traditional VAV) . . . . . . . . . . . . . . . . . . . . . . 38

Final System Set Up . . . . . . . . . . . . . . . . . . 40

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Fan Belt Adjustment—Belt Drive Units . . 41

Monthly Maintenance . . . . . . . . . . . . . . . . . 42

Final Process . . . . . . . . . . . . . . . . . . . . . . . . . 43

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 44

ReliaTel Control . . . . . . . . . . . . . . . . . . . . . . .44

System Status Checkout Procedure . . . . . .44

Resetting Cooling and Heating Lockouts . .45

Zone Temperature Sensor (ZTS) Service Indi-

cator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Zone Temperature Sensor (ZTS) Test . . . .46

Programmable & Digital Zone Sensor Test 47

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . .49

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

RT-SVX26L-EN 5

Model Number Descriptions

All products are identified by a

multiple character model number that

precisely identifies a particular type of

unit. An explanation of the

alphanumeric identification code is

provided. Its use will enable the

owner/operator, installing

contractors, and service engineers to

define the operation, specific

components, and other options for

any specific unit.

When ordering replacement parts or

requesting service, be sure to refer to

the specific model number and serial

number printed on the unit

nameplate.

Digit 1 — Unit Type

Y = Packaged Gas/Electric

Digit 2 — Efficiency

S = Standard Efficiency

H = High Efficiency

Digit 3 — Airflow Configuration

D= Downflow

H= Horizontal

Digit 4, 5, 6 — Nominal Gross

Cooling Capacity (MBh)

150 = 12½ Tons, 60Hz

155 = 15 Tons, 50Hz

180 = 15 Tons, 60Hz

175 = 17½ Tons, 50Hz

210 = 17½ Tons, 60Hz

200 = 20 Tons, 50Hz

240 = 20 Tons, 60Hz

250 = 25 Tons, 50Hz

300 = 25 Tons, 60Hz

Digit 7 — Major Design

Sequence

F = Microchannel Type Condenser

Coils

G = ASHRAE 90.1-2013 (Fan/

Compressor Staging)14

Digit 8 — Voltage Selection

3 = 208-230/60/3

4 = 460/60/3

W = 575/60/3

K = 380/60/3

D = 380-415/50/3

Digit 9 — Unit Controls

R = Reliatel

Digit 10 — Heating Capacity

H = Gas Heat - High

L=Gas Heat - Low

V = Gas Heat - SS Ht Ex - Modulating

X = Gas Heat - SS Ht Ex - Low

YS D 150 F 3 R H A A

12 3 456 7 8 9 10 11 12

Z = Gas Heat - SS Ht Ex - High

Digit 11 — Minor Design

Sequence

Digit 12, 13 — Service Sequence

00 = None

01 = 18mm Microchannel Condenser

Coil

Note: ‘01’ only available on select

models.

Digit 14 — Fresh Air Selection

0=No Fresh Air

D = Econ Dry Bulb w/ Barometric

Relief1

F = Econ Reference Enthaply w/

Barometric Relief1

H = Econ Comparative Enthaply w/

Barometric Relief1

K = Low Leak Econ w/ Barometric

Relief1

M = Low Leak Econ Reference

Enthalpy w/ Barometric Relief1

P = Low Leak Econ Comparative

Enthalpy w/ Barometric Relief1

Digit 15 — Supply Fan/Drive

Type/Motor

0=Standard Motor

1 = Oversized Motor6

3 = High Efficiency Motor6

6 = Single Zone Variable Air Volume

Standard Motor

7 = Multi-Speed Standard Motor

8 = Single Zone Variable Air Volume

Oversized Motor

9 = Multi-Speed Oversized Motor

A = Single Zone Variable Air Volume

Standard Motor w/ Shaft

Grounding Ring

B = Multi-Speed Standard Motor w/

Shaft Grounding Ring

C = Single Zone Variable Air Volume

Oversized Motor w/ Shaft

Grounding Ring

D = Multi-Speed Oversized Motor w/

Shaft Grounding Ring

E = VAV Supply Air Temperature

Control - Standard Motor

F = VAV Supply Air Temperature

Control - Oversized Motor

G = VAV Supply Air Temperature

Control - Standard Motor w/ Shaft

Grounding Ring

H = VAV Supply Air Temperature

Control - Oversized Motor w/

Shaft Grounding Ring

Digit 16 — Hinged Service

Access / Filters

0 = Standard Panels/Standard

Filters25

A = Hinged Access/Standard Filters25

B = Standard Panels/MERV 8 Filters6

C = Hinged Access/MERV 8 Filters6

D = Standard Panels/MERV 13 Filters6

E = Hinged Access/MERV 13 Filters6

Digit 17 — Condenser Coil

Protection

0 = Standard Coil

1 = Standard Coil With Hail Guard

4 = CompleteCoat™Condenser Coil

5 = CompleteCoat™Condenser Coil

with Hail Guard

Digit 18 — Through The Base

Provisions

0 = No Through The Base Provisions

A = Through The Base Electric12

B = Through The Base Gas

C = Through The Base Electric/Gas12

D = Through The Base Access

Digit 19 — Disconnect Switch/

Circuit Breaker11

0 = No Disconnect/circuit break

1 = Unit Mounted Non-Fused

Disconnect Switch

2 = Unit Mounted Circuit Breaker

Digit 20 — Convenience Outlet

Option

0 = Without Convenience Outlet

A = Unpowered Convenience Outlet5

B = Powered Convenience Outlet5

Digit 21 — Communications

Options

0 = Without Communications Options

1 = Trane Communications Interface6, 17

2 = Lontalk Communications

Interface6

3 = Novar 2024 Controls Interface19

4 = Novar 3051 Controls Interface19

5 = Novar 3051 Communications

Interface with Demand Control

Ventilation19

6 = Building Automation Control

Network Communications

Interface

Digit 22 — Refrigeration System

Option

0 = Standard refrigeration system

B = Dehumidification (Hot Gas

Reheat)4,14

Digit 23 — Refrigeration Controls

0 = Without Refrigeration Controls

1=Frostat

9, 21

Digit 24 — Smoke Detector2,10

0 = Without Smoke Detector

A = Return Air Smoke Detector

B = Supply Air Smoke Detector

C = Return/Supply Air Smoke

Detector

D = Plenum Smoke Detector22

Model Number Description

6 RT-SVX26L-EN

Model Number Description

Digit 25 — System Monitoring

Controls

0 = No Monitoring Controls

1 = Clogged Filter Switch9

2 = Fan Failure Switch9

3 = Discharge Air Sensing9

4 = Clogged Filter Switch and Fan

Failure switch9

5 = Clogged Filter Switch and

Discharge Air Sensing9

6 = Fan Failure Switch and Discharge

Air Sensing9

7 = Clogged Filter Switch, Fan Failure

Switch and Discharge Air

Sensing9

8 = NOVAR Return Air Sensor (Novar

2024)13,19

9 = NOVAR Zone Temp Sensor

(Novar 3051)19

A = Condensate Drain Pan Overflow

Switch

B = Clogged Filter Switch and

Condensate Drain Pan Overflow

Switch9

C = Fan Failure Switch and

Condensate Drain Pan Overflow

Switch9

D = Discharge Air Sensing and

Condensate Drain Pan Overflow

Switch9

E = Clogged Filter Switch, Fan Failure

Switch and Condensate Drain Pan

Overflow Switch9

F = Clogged Filter Switch, Discharge

Air Sensing Tube and Condensate

Drain Pan Overflow Switch9

G = Fan Failure Switch, Discharge Air

Sensing Tube and Condensate

Drain Pan Overflow Switch9

H = Clogged Filter Switch, Fan Failure

Switch, Discharge Air Sensing

and Condensate Drain Pan

Overflow Switch9

Digit 26 - System Monitoring

Controls

0 = No Monitoring Controls

A = Demand Control Ventilation

(CO2)20

B = FDD (Fault Detection and

Diagnostics)

C = FDD (Fault Detection Diagnostics)

& Demand Control Ventilation

(CO2)20

Digit 27 - Unit Hardware

Enhancements

0 = No Enhancements

1 = Stainless Steel Drain Pan

Digit 28 - Short Circuit Current

Rating

0 = Standard SCCR

A = 65kA SCCR Option23, 24

Digit 31 - Advanced Unit

Controls

0 = Standard Unit Controls

1=Human Interface

26

Note: Most Factory Installed Options

available for Downflow Air

Discharge units only. Please verify

with ordering system for

availability.

Model Number Notes

1. Some field set up required.

2. Requires ReliaTel Options Module.

3. Requires Economizer.

4. All 22nd digit model numbers for

reheat coil (B) require additional

factory installed options: Frostat,

and 2” pleated filters.

5. Must be ordered with Through-

the-Base Electrical option or

Horizontal-Side Access and either

Unit Mounted Disconnect or

Circuit Breaker.

6. Available factory installed on

downflow AND horizontal units.

Verify with ordering system.

7. Cannot be fused.

8. Must be factory installed when

using Through-the-Base Options.

9. ReliaTel Options Module is

required when ordering the

following accessories: Clogged

Filter Switch, Fan Fail Switch,

Condensate Overflow Switch,

Discharge Air Sensing Kit, Frostat,

Ventilation Override, Smoke

Detector, Dehumidification and

Modulating Gas Heat Furnace.

10. Option cannot be ordered in

conjunction with field installed

economizer on downflow units.

Must be factory installed. The

return air smoke detector may not

fit up or work properly on the

Voyager 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.

11. Unit mounted disconnect and

circuit breakers are mutually

exclusive of each other.

12. Through-the-base electrical

option or Horizontal-Side Access

must be ordered with either unit

mounted disconnect or circuit

breaker.

13. This option consists of the Novar

return air sensor (Novar #WTS-10)

that is wired and shipped in the

return air section of the unit. The

sensor ships with approximately

15’ of extra wire for dropping

down the return air duct

(downflow only).

14. Available on high efficiency units

only.

15. All Factory Installed Options are

Built-to-Order. Check order

services for estimated production

cycle.

16. The Novar control option includes

the following factory installed and

wired devices: Novar ETM-2024 or

Novar 3051 rooftop controller, fan

proving switch, clogged filter or

unit shutdown switch, Cool 1,

Cool 2, Heat switch and discharge

air sensor (Novar 2024 is

downflow only).

Note: Option cannot be ordered in

conjunction with a factory

installed smoke detector.

17. TCI is for use with non-VariTrac

systems and VariTrac systems.

18. For use with multi-speed and

SZVAV units only.

19. Novar is not available with SZ VAV

products.

20. Demand Control Ventilation

Option includes wiring only. The

C02 sensor is a field-installed only

option.

21. Frostat is standard on VAV, and

high efficiency units.

22. Supply and/or return smoke

detector may not be used with the

plenum smoke detector.

23. Only available where MOP is

above 60A.

24. 575 VAC option is 25kA.

25. Standard filters are not available

with Low Leak Economizers.

26. Human Interface is standard with

FDD (Fault Detection Diagnostics).

RT-SVX26L-EN 7

General Information

Unit Description

Before shipment, each unit is leak tested, dehydrated,

charged with refrigerant and compressor oil, and run

tested for proper control operation.

For major design sequence F units, the condenser coils are

microchannel type aluminum coils.

Direct-drive, vertical discharge condenser fans are

provided with built-in thermal overload protection.

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.

This module 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 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

±5 percent 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 in·lb of torque and is

powered by 24 Vac.

RTCI—ReliaTel™ Trane Communication

Interface (Optional)

This module is used when the application calls for an ICS™

building management type control system. It allows the

control and monitoring of the system through 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 ICS™

building management type control system that is LonTalk.

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.

RBCI—ReliaTel BACnet™ Communications

Interface (Optional)

This module is used when the application calls for an 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

(Optional)

The RTOM monitors the supply fan proving, clogged filter,

supply air temperature, exhaust fan setpoint, supply air

tempering, Frostat™ and smoke detector. Refer to system

input devices and functions for operation.

RTAM—ReliaTel™ Air Handler Module

(Standard with Traditional VAV)

RTAM receives information from the supply duct static

pressure transducer. Attached to the module are the

supply air heating potentiometer, supply air cooling

setpoint potentiometer, supply pressure setpoint

potentiometer, static pressure deadband potentiometer,

morning warm-up setpoint potentiometer, reset setpoint

potentiometer, and 5 DIP switches.

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 depends upon the type of zone sensor or

thermostat selected to interface with the RTRM.

The descriptions of the following basic Input Devices 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 (FFS) can be connected to sense

indoor fan operation. If air flow through the unit is not

General Information

8 RT-SVX26L-EN

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.

Drain Pan Condensate Overflow Switch

(Optional)

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 function 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 the unit to

shutdown more than 2 times in a 3 day period, the unit will

be locked-out of operation. A manual reset of the

diagnostic system through the Zone Sensor or Building

Automation System (BAS) will be required. Cycling unit

power will also clear the fault.

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 closed

for at least 2 minutes. The system will continue to operate

regardless of the status of the filter switch.

Please note that 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.

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.

Phase Monitor

The Phase Monitor is a three-phase line monitor module

that protects against phase loss, phase reversal and phase

unbalance. It is intended to protect compressors from

reverse rotation. It has an operating input voltage range of

190–600 Vac, and LED indicators for ON and FAULT. There

are no field adjustments and the module will automatically

reset from a fault condition.

Low Pressure Control 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 the first

three minutes of operation, the compressor will be locked

out, a diagnostic communicated to ICS™ if applicable, and

a manual reset will be required to restart the compressor.

Discharge Line Thermostat ReliaTel

Control

The high pressure controls and discharge line thermostats

are wired in series between the compressor outputs on the

RTRM and the compressor contactor coils. If the high

pressure control switch or discharge line thermostat open,

the RTRM senses a lack of current while calling for cooling

and locks the compressor out. This is an auto reset lockout.

If the circuit is open three consecutive times when the

contactor coil should be on, the RTRM sets a manual

lockout for that compressor.

Power Exhaust Control (Optional)

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.

The setpoint panel is located in the return air section and

is factory set at 25 percent.

Lead/Lag Control (Dual Circuit 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.

General Information

RT-SVX26L-EN 9

Evaporator Frost Control

This input incorporates the Frostat™ control (FOS)

mounted in the indoor coil and can be activated by 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.

Sensors

Note: Zone sensor required for units configured for

Single Zone VAV indoor fan system control to

enable Single Zone VAV functionality.

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 BAYSENS075*.

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 LEDs. It is a manual or auto

changeover control with dual setpoint capability. It can be

used with a remote zone temperature sensor

BAYSENS075*.

Programmable Zone Sensor

(BAYSENS119*)

Programmable Night Setback: Auto or manual changeover

with seven-day programming. Keyboard selection of Heat,

Cool, Fan, Auto, or On. All programmable sensors have

System On, Heat, Cool, Service LED/indicators as

standard. Night Setback Sensors have one (1) Occupied,

one (1) Un-occupied, and one (1) Override program per

day.

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 a Trane 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, and remote

temperature sensing (uncovered). Wiring procedures vary

according to the particular application and equipment

involved. Refer to the unit’s wiring diagrams for proper

connections.

Remote Zone Sensor (BAYSENS075*)

This electronic sensor can be used with BAYSENS119*

Remote Panels. When this sensor is wired to a

BAYSENS119* Remote Panel, wiring must be 18 AWG

Shielded Twisted Pair (Belden 8760 or equivalent). Refer to

the specific Remote Panel for wiring details.

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 a manual 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.

High Temperature Sensor (BAYFRST003*)

This sensor connects to the RTRM Emergency Stop Input

on the LTB and provides high limit “shutdown” of the unit.

The sensor is used to detect high temperatures due to fire

in the air conditioning or ventilation ducts. The sensor is

designed to mount directly to the sheet metal duct. Each kit

contains two sensors. The return air duct sensor

(X1310004001) is set to open at 135°F.

The supply air duct sensor (X1310004002) is set to open at

240°F. The control can be reset after the temperature has

been lowered approximately 25°F below the cutout

setpoint.

Thermostat (BAYSTAT150)

This thermostat is a multi-stage 3 heat/2 cool, auto-

changeover digital display thermostat. It is a

programmable thermostat, and a 7-day programmable

stat with night setback shall be available. In addition, it is

wall mounted.

General Information

10 RT-SVX26L-EN

Thermostat (BAYSTAT151)

This thermostat is a single-stage 1 heat/1 cool, auto-

changeover digital display thermostat. It is a non-

programmable, wall-mounted thermostat.

Thermostat (BAYSTAT155)

This thermostat is a multi-stage 3 heat/2 cool, auto

changeover digital display thermostat. It is a non-

programmable, wall-mounted thermostat, and it can be

used for Economizer Operation.

Smoke Detector Sensor (Optional)

This sensor is only applicable on units equipped with a

RTOM. It provides high limit “shutdown” of the unit and

requires a manual reset. The sensor is used to detect

smoke due to fire in the air conditioning or ventilation

ducts.

Notes:

•The supply and return air smoke detectors are

designed to shut off the unit if smoke is sensed in the

supply air stream or return air stream. 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 it's 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.

There are certain models, however, if operated at low

airflow, will not develop an airflow velocity that falls within

the required 500 to 4000 feet per minute range. For these

models, the design airflow shall be greater than or equal

to the minimum cfm specified in the table provided below.

Failure to follow these instructions will prevent the smoke

detector from performing its design function.

Wall Mounted Relative Humidity Sensor

(BAYSENS036*)

Field installed, wall mounted humidity sensor is used to

control activation of the hot gas reheat dehumidification

option.

Humidity set points can be selected for relative humidity

levels between 40 percent and 60 percent by adjusting the

DEHUMID setting on the ReliaTel Options Module; see

“RTOM—ReliaTel™ Options Module (Optional),” p. 7.

Duct Mounted Relative Humidity Sensor

(BAYSENS037*)

Field installed, duct mounted humidity sensor is used to

control activation of the hot gas reheat dehumidification

option.

Humidity set points can be selected for relative humidity

levels between 40 percent and 60 percent by adjusting the

DEHUMID setting on the ReliaTel Options Module; see

“RTOM—ReliaTel™ Options Module (Optional),” p. 7.

Human Interface - 5 Inch Color

Touchscreen (Optional)

The 5 inch Color Touchscreen 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

Unit Model

Number Minimum Allowable Airflow with

Return Air Smoke Detector

YHD180 5300 cfm

General Information

RT-SVX26L-EN 11

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.

• 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.

Precautionary Measures

• Avoid breathing fiberglass dust.

• Use a NIOSH approved dust/mist respirator.

• Avoid contact with the skin or eyes. Wear long-sleeved,

loose-fitting clothing, gloves, and eye protection.

• Wash clothes separately from other clothing: rinse

washer thoroughly.

• Operations such as sawing, blowing, tear-out, and

spraying may generate fiber concentrations requiring

additional respiratory protection. Use the appropriate

NIOSH approved respiration in these situations.

First Aid Measures

• Eye Contact - Flush eyes with water to remove dust. If

symptoms persist, seek medical attention.

• Skin Contact - Wash affected areas gently with soap

and warm water after handling.

Storage

Take precautions to prevent condensate from forming

inside the unit’s electrical compartments and motors if:

• The unit is stored before it is installed; or,

• 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,

S/A and R/ A 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 “Start Up,” p. 37.

The manufacturer will not assume any responsibility for

equipment damage resulting from condensate

accumulation on the unit’s electrical and/or mechanical

components.

Unit Clearances

Figure 1, p. 12 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.

WARNING

Fiberglass Wool!

Product contains fiberglass wool. Disturbing the

insulation in this product during installation,

maintenance or repair will expose you to airborne

particles of glass wool fibers and ceramic fibers known

to the state of California to cause cancer through

inhalation. You MUST wear all necessary Personal

Protective Equipment (PPE) including gloves, eye

protection, a NIOSH approved dust/mist respirator, long

sleeves and pants when working with products

containing fiberglass wool. Exposition to glass wool

fibers without all necessary PPE equipment could result

in cancer, respiratory, skin or eye irritation, which could

result in death or serious injury.

12 RT-SVX26L-EN

Unit Dimensions

Figure 1. Typical installation clearance for single and multiple unit applications

5' 8"

5' 0"

Unit Dimensions

RT-SVX26L-EN 13

Note: ½ NPT Gas Connection

Figure 2. Unit dimensional data for 12½ tons standard efficiency units

Figure 3. Unit dimensional data for 12½ tons standard efficiency units

2710 mm

(106 11/16”)

1273 mm

(50 1/8”)

168 mm

(6 5/8”)

651 mm

(25 5/8”)

1799 mm

(70 13/16”)

213 mm

(8 3/8”)

745 mm

(29 5/16”)

68 mm

(2 11/16”)

25 mm

(1”)

1453 mm

(57 3/16”)

152 mm

(6”)

(SEE NOTE)

22 mm (7/8”) DIA. HOLE

(UNIT CONTROL WIRE)

51 mm (2”) DIA. HOLE

(UNIT POWER WIRE)

DOWNFLOW CONDENSATE

DRAIN CONN 25 mm (1”) NPT

SERVICE GAUGE

PORT ACCESS

Unit Dimensions

14 RT-SVX26L-EN

Note: ½ NPT Gas Connection

Figure 4. Horizontal duct dimensional data 12½ tons standard efficiency units

Figure 5. Unit dimensional data 15–25 tons standard efficiency units

3091 mm

(121 11/16”)

1372 mm

(54”)

173 mm

(6 13/16”)

679 mm

(26 3/4”)

2138 mm

(84 3/16”)

227 mm

(8 15/16”)

25 mm

(1”)

830 mm

(32 11/16”)

1643 mm

(64 11/16”)

151 mm

(5 15/16”)

22 mm (7/8”) DIA. HOLE

(UNIT CONTROL WIRE)

51 mm (2”) DIA. HOLE

(UNIT POWER WIRE)

DOWNFLOW CONDENSATE

DRAIN CONN 25 mm (1”) NPT

(SEE NOTE)

68 mm

(2 11/16”)

Unit Dimensions

RT-SVX26L-EN 15

Note: ½ NPT Gas Connection

Note: ½ NPT Gas Connection

Figure 6. Unit dimensional data 12½ ton high efficiency units

Figure 7. Unit dimensional data 15–25 tons high efficiency units

3091 mm

(121 11/16”)

1372 mm

(54”)

679 mm

(26 3/4”)

2138 mm

(84 3/16”)

227 mm

(8 15/16”)

25 mm

(1”)

843 mm

(33 3/16”)

68 mm

(2 11/16”)

1643 mm

(64 11/16”)

152 mm

(6”)

GAS CONNECTION (SEE NOTE 1)

22 mm (7/8”) DIA. HOLE

(UNIT CONTROL WIRE)

76 mm (3”) DIA. HOLE

(UNIT POWER WIRE)

DOWNFLOW CONDENSATE

DRAIN CONN 25 mm (1”) NPT

3091 mm

(121 11/16”)

1629 mm

(64 1/8”)

679 mm

(26 3/4”)

2138 mm

(84 3/16”)

227 mm

(8 15/16”)

25 mm

(1”)

843 mm

(33 3/16”)

68 mm

(2 11/16”)

1643 mm

(64 11/16”)

152 mm

(6”)

GAS CONNECTION (SEE NOTE 1)

22 mm (7/8”) DIA. HOLE

(UNIT CONTROL WIRE)

76 mm (3”) DIA. HOLE

(UNIT POWER WIRE)

DOWNFLOW CONDENSATE

DRAIN CONN 25 mm (1”) NPT

Unit Dimensions

16 RT-SVX26L-EN

Figure 8. Unit dimensional data 15–25 tons standard efficiency units, 12½–25 tons high efficiency units

Figure 9. Horizontal duct dimensional data 15–25 tons standard efficiency units, 12½–25 tons high efficiency units

RT-SVX26L-EN 17

Unit Weights

Table 1. Typical unit weights and point loading data (lb)

Unit

Models

Net

Weights

(25mm/

18mm)

Corner Weights (lb)

ABCD

YS*150F 1508 506 390 275 337

YH*150G 2207 686 588 437 495

YH*150G

Reheat unit 2226 692 593 441 499

YS*155F 1958 628 534 387 406

YS*180F 1925 666 505 343 410

YH*180G 2176 651 592 444 490

YH*180G

Reheat unit 2194 657 597 447 494

YS*175F 2007 637 547 400 421

YS*210F 2007 639 547 399 419

YH*210G 2140 656 571 418 495

YH*210G

Reheat unit 2159 662 576 422 499

YS*200F 2069 659 551 402 455

YS*240F 2069 659 551 402 455

YH*240G 2211 705 581 421 504

YH*240G

Reheat unit 2231 711 586 425 509

YS*250F 2054 655 555 403 442

YS*300F 2054 655 555 403 442

YH*300G 2245 720 593 423 510

Table 2. Typical unit weights and point loading data (kg)

Unit

Models

Net

Weights

(25mm/

18mm)

Corner Weights (kg)

AB CD

YS*150F 684 230 177 125 153

YH*150G 1003 312 267 199 225

YH*150G

Reheat unit 1010 314 269 200 227

YS*155F 888 285 242 176 184

YS*180F 873 302 229 156 186

YH*180G 989 296 269 202 223

YH*180G

Reheat unit 995 298 271 203 224

YS*175F 910 289 248 181 191

YS*210F 910 290 248 181 190

YH*210G 973 298 259 190 225

YH*210G

Reheat unit 979 300 261 192 226

YS*200F 938 299 250 182 206

YS*240F 938 299 250 182 206

YH*240G 1005 320 264 191 229

YH*240G

Reheat unit 1012 322 266 193 231

YS*250F 932 297 252 183 200

YS*300F 932 297 252 183 200

YH*300G 1021 327 269 192 232

Figure 10. Corner weights

Unit Weights

18 RT-SVX26L-EN

Rigging

Refer to Figure 11, p. 18 and Tab l e 1 , p. 17 and Ta b le 2,

p. 17 for typical unit operating weights rigging before

proceeding.

1. Remove the shipping crate from around the unit. Do

not remove the crating from the top of the unit.

2. Rig the unit as shown in Figure 11, p. 18. Attach

adequate strength lifting slings to all four lifting

brackets in the unit base rail. Do not use cables, chains,

or slings except as shown.

3. Install a lifting bar, as shown in Figure 11, p. 18, to

protect the unit and to facilitate a uniform lift. The

minimum distance between the lifting hook and the

top of the unit should be 7 feet.

4. Test-lift the unit to ensure it is properly rigged and

balanced, make any necessary rigging adjustments.

5. Lift the unit and position it into place.

6. Downflow units; align the base rail of the unit with the

curb rail while lowering the unit onto the curb. Make

sure that the gasket on the curb is not damaged while

positioning the unit.

WARNING

Heavy Objects!

Ensure that all the lifting equipment used is properly

rated for the weight of the unit being lifted. Each of the

cables (chains or slings), hooks, and shackles used to

lift the unit must be capable of supporting the entire

weight of the unit. Lifting cables (chains or slings) may

not be of the same length. Adjust as necessary for even

unit lift. Other lifting arrangements could cause

equipment or property damage. Failure to follow

instructions above or properly lift unit could result in

unit dropping and possibly crushing operator/

technician which could result in death or serious injury.

WARNING

Improper Unit Lift!

Test lift unit approximately 24 inches to verify proper

center of gravity lift point. To avoid dropping of unit,

reposition lifting point if unit is not level. Failure to

properly lift unit could result in unit dropping and

possibly crushing operator/technician which could

result in death or serious injury and possible equipment

or property-only damage.

Figure 11. Rigging and center of gravity data

RT-SVX26L-EN 19

Installation

Foundation

Horizontal Units

Notes:

•For units with optional Condensate Overflow Switch

(COF), the switch will not work properly if unit is not

level or slightly sloped toward switch.

•To assure proper condensate flow during operation the

unit and the curb must be level.

If the unit is installed at ground level, elevate it above the

snow line. Provide concrete footings at each support

location with a “full perimeter” support structure or a slab

foundation for support. Refer to Table 1, p. 17 and Tab l e 2 ,

p. 17 for the unit’s operating and point loading weights

when constructing a footing foundation.

If anchoring is required, anchor the unit to the slab using

hold down bolts or isolators. Isolators should be installed

to minimize the transmission of vibrations into the

building.

For rooftop applications, if anchoring is required, anchor

the unit to the roof with hold-down bolts or isolators.

Check with a roofing contractor for proper waterproofing

procedures.

Ductwork

Elbows with turning vanes or splitters are recommended

to minimize air noise due to turbulence and to reduce static

pressure.

When attaching the ductwork to the unit, provide a water-

tight flexible connector at the unit to prevent operating

sounds from transmitting through the ductwork.

All outdoor ductwork between the unit and the structure

should be weather proofed after installation is completed.

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

roof deck for the ductwork penetrations. Do not cut

out the entire roof deck within the curb perimeter.

If a Curb Accessory Kit is not used:

a. The ductwork can be attached directly to the

factory-provided flanges around the unit’s supply

and return air openings. Be sure to use flexible duct

connections at the unit.

b. For “built-up” curbs supplied by others, gaskets

must be installed around the curb perimeter flange

and the supply and return air opening flanges.

General Unit Requirements

The checklist listed below is a summary of the steps

required to successfully install a commercial unit. This

checklist is intended to acquaint the installing personnel

with what is required in the installation process. It does not

replace the detailed instructions called out in the

applicable sections of this manual.

• Check the unit for shipping damage and material

shortage; file a freight claim and notify appropriate

sales representative.

• Verify correct model, options and voltage from

nameplate.

• Verify that the installation location of the unit will

provide the required clearance for proper operation.

• Assemble and install the roof curb (if applicable). Refer

to the latest edition of the curb installers guide that

ships with each curb kit.

• Fabricate and install ductwork; secure ductwork to

curb.

• Rigging the unit.

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

• Ensure unit-to-curb seal is tight and without buckles or

cracks.

• Install and connect a condensate drain line to the

evaporator drain connection.

WARNING

Risk of Roof Collapsing!

Confirm with a structural engineer that the roof

structure is strong enough to support the combined

weight of the roofcurb and the unit. Refer to “Unit

Weights,” p. 17 for typical unit and curb weights. Failure

to ensure proper structural roof support could cause the

roof to collapse, which could result in death or serious

injury and property damage.

NOTICE:

Water Damage!

Non-factory penetrations through the base of this unit

are not allowed. Any penetration in the base of the unit

may affect the water tight integrity of the unit and lead

to water leaks into the conditioned space. Failure to

follow instructions could result in equipment and

property damage.

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Installation

20 RT-SVX26L-EN

Factory Installed Economizer

• Ensure the standard economizer has been pulled out

into the operating position. Refer to the economizer

Installation Instructions for proper setup.

Note: Low Leak Economizers do not pull out. Refer to Low

Leak Economizers Installation Instructions for

proper setup.

• Install all access panels.

Main Electrical Power Requirements

• Verify that the power supply complies with the unit

nameplate specifications.

• 208VAC units are factory wired for 230VAC. Line side

wiring on TNS1 and TNS3 will need to be moved from

230V terminal to 208V terminal. Factory powered

convenience outlets also need to be configured. Please

see Powered Convenience Outlet Powered Option

(FIYCOPO) section of this document.

• Inspect all control panel components; tighten any

loose connections.

• Connect properly sized and protected power supply

wiring to a field-supplied/ installed disconnect switch

and to the main power terminal block (HTB1) in the unit

control panel.

• Install proper grounding wires to an earth ground.

Note: All field-installed wiring must comply with NEC

and applicable local codes.

Electric Heat Requirements

• Verify that the power supply complies with the electric

heater specifications on the unit and heater nameplate.

• Inspect the heater junction box and control panel;

tighten any loose connections.

• Check electric heat circuits for continuity.

• Low Voltage Wiring (AC and DC) Requirements

• Install the zone thermostat, with or without switching

subbase.

• Connect properly sized control wiring to the proper

termination points between the zone thermostat and

the unit control panel.

Condensate Drain Configuration

An evaporator condensate drain connection is provided

on each unit. Refer to “Unit Dimensions,” p. 12 for the

appropriate drain location.

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

drain connection being on the “negative pressure” side of

the fan. Install the P-Trap using the guidelines in Figure 12.

A condensate drain line must be connected to the P-Trap.

Pitch the drain lines at least ½-inch for every 10 feet of

horizontal run to assure proper condensate flow. Do not

allow the horizontal run to sag causing a possible double-

trap condition which could result in condensate backup

due to “air lock”.

Filter Installation

Each unit ships with 2-inch filters installed. The quantity of

filters is determined by unit size. Access to the filters is

obtained by removing the indoor fan access panel. If

included, pull on filter removal tool to remove filters.

Refer to the unit Service Facts (shipped with each unit) for

filter requirements.

Note: Do not operate the unit without filters.

Field Installed Power Wiring

An overall dimensional layout for the standard field

installed wiring entrance into the unit is illustrated in “Unit

Dimensions,” p. 12. To insure that the unit’s supply power

wiring is properly sized and installed, follow the guidelines

outlined below.

Note: All field installed wiring must conform to NEC

guidelines as well as state and Local codes.

Verify that the power supply available is compatible with

the unit’s nameplate ratings. The available supply power

must be within 10 percent of the rated voltage stamped on

the nameplate. Use only copper conductors to connect the

power supply to the unit.

Note: If the unit is not equipped with an optional factory

installed nonfused disconnect switch or circuit

breaker, a field supplied disconnect switch must be

installed at or near the unit in accordance with the

National Electrical Code (NEC latest edition).

Figure 12. Condensate trap installation

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of

conductors. Failure to use copper conductors could

result in equipment damage.

Installation

RT-SVX26L-EN 21

Main Unit Power

Standard Wiring

The electrical service must be protected from over current

and short circuit conditions in accordance with NEC

requirements.

Protection devices must be sized according to the

electrical data on the nameplate.

• If the unit is not equipped with an optional factory

installed nonfused disconnect switch or circuit breaker,

a field supplied disconnect switch must be installed at

or near the unit in accordance with the National

Electrical Code (NEC latest edition).

• Location of the applicable electrical service entrance is

illustrated in “Unit Dimensions,” p. 12. Complete the

unit’s power wiring connections onto either; the main

terminal block HTB1 inside the unit control panel, the

factory mounted nonfused disconnect switch (UCD) or

circuit breaker (UCB), or the electric heat terminal

block. Refer to the customer connection diagram that

shipped with the unit for specific termination points.

• Provide proper grounding for the unit in accordance

with local and national codes.

Optional TBUE Wiring (Through the Base

Electrical Option)

• Location of the applicable electrical service is

illustrated below. Refer to the customer connection

diagram that is shipped with the unit for specific

termination points. The termination points, depending

on the customer option selected would be a factory

mounted nonfused disconnect switch (UDC) or circuit

breaker (UCB).

• Provide proper grounding for the unit in accordance

with local and national codes.

Field Installed Control Wiring

An overall layout of the various control options available

with the required number of conductors for each control

device is illustrated in Figure 18, p. 24.

Note: All field wiring must conform to NEC guidelines as

well as state and local codes.

Control Power Transformer

The 24-volt control power transformers are to be used only

with the accessories called out in this manual.

Transformers rated greater than 50 Vac are equipped with

internal circuit breakers. If a circuit breaker trips, turn “Off”

all power to the unit before attempting to reset it.

The transformer is located in the control panel. The circuit

breaker is located on the left side of the transformer and

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

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Figure 13. Through the base electrical option

Installation

22 RT-SVX26L-EN

Controls using 24 Vac

Before installing any connecting wiring, refer to “Unit

Dimensions,” p. 12 for the electrical access locations

provided on the unit and Ta bl e 3 , p. 22 for AC conductor

sizing guidelines.

1. Use copper conductors unless otherwise specified.

2. Ensure that the AC control wiring between the controls

and the unit’s termination point does not exceed three

(3) ohms/conductor for the length of the run.

Note: Resistance in excess of 3 ohms per conductor

could cause component failure due to insufficient

AC voltage supply.

3. Be sure to check all loads and conductors for grounds,

shorts, and mis-wiring.

4. Do not run the AC low voltage wiring in the same

conduit with the high voltage power wiring.

5. Route low voltage wiring per illustrations on the next

page.

Controls using DC Analog Input/Outputs

(Standard Low Voltage Multiconductor

Wire)

Before installing any connecting wiring between the unit

and components utilizing a DC analog input\output signal,

refer to “Unit Dimensions,” p. 12 for the electrical access

locations provided on the unit.

1. Ta b l e 4 lists the conductor sizing guidelines that must

be followed when interconnecting the DC binary

output devices and the system components utilizing a

DC analog input\output signal to the unit.

Note: Resistance in excess of 2.5 ohms per conductor can

cause deviations in the accuracy of the controls.

2. Ensure that the wiring between controls and the unit’s

termination point does not exceed two and a half (2.5)

ohms/conductor for the length of the run.

3. Do not run the electrical wires transporting DC signals

in or around conduit housing high voltage wires

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of

conductors. Failure to use copper conductors could

result in equipment damage.

Table 3. Electromechanical thermostat 24 Vac

conductors with ReliaTel™

Distance from Unit to

Control Recommended Wire Size

000–460 feet 18 gauge

000–140 m 0.75 mm2

461–732 feet 16 gauge

Table 4. Zone sensor module wiring

Distance from Unit to

Control Recommended Wire Size

0–150 feet (0–45.7 m) 22 gauge (0.33 mm2)

151–240 feet (46–73.1 m) 20 gauge (0.50 mm2)

241–385 feet (73.5–117.3 m) 18 gauge (0.75 mm2)

386–610 feet (117.7–185.9 m) 16 gauge (1.3 mm2)

611–970 feet (186.2–295.7 m) 14 gauge ( 2.0 mm2)

Figure 14. ReliaTel™ options module

Figure 15. ReliaTel conventional thermostat field wiring

diagram

RTRM

Installation

RT-SVX26L-EN 23

Figure 16. ReliaTel relative humidity sensor

(dehumidification option)

Figure 17. ReliaTel humidistat (dehumidification

option)

Installation

24 RT-SVX26L-EN

Figure 18. Typical field wiring diagrams for optional controls (ReliaTel only)

BAYSENS075*

BAYSENS075*

BAYSENS119*

BAYSENS110*

BAYSENS108*

BAYSENS106*

BAYSENS073* BAYSENS074*

BAYSENS075*

ASYSTAT669A

OPTIONAL REMOTE SENSOR

Installation

RT-SVX26L-EN 25

Space Temperature Averaging

Space temperature averaging is accomplished by wiring a

number of remote sensors in a series/parallel circuit.

Using the BAYSENS016* or BAYSENS077*, at least four

sensors are required to accomplish space temperature

averaging.

Example #1 illustrates two series circuits with two sensors

in each circuit wired in parallel. The square of any number

of remote sensors required. Example #2 illustrates three

sensors squared in a series/parallel circuit. Example #3

illustrates the circuit required for this senor. Tabl e 5 lists

the temperature versus resistance coefficient for all

sensing.

Table 5. Temperature vs. resistance

Degrees Nominal Resistance

(K-Ohms) °F °C

-20 -28.9 170.1

-15 -26.1 143.5

-10 -23.3 121.4

-5 -20.6 103.0

0 -17.8 87.56

5 -15.0 74.65

10 -12.2 63.80

15 -9.4 54.66

20 -6.7 46.94

25 -3.8 40.40

30 -1.1 34.85

35 1.7 30.18

40 4.4 26.22

45 7.2 22.85

50 10.0 19.96

55 12.8 17.47

60 15.6 15.33

65 18.3 13.49

70 21.1 11.89

75 23.9 10.50

80 26.7 9.297

85 29.4 8.247

90 32.2 7.330

95 35.0 6.528

100 37.8 5.824

Installation

26 RT-SVX26L-EN

Table 6. Space temperature averaging examples

Installation

RT-SVX26L-EN 27

Use the following checklist in conjunction with the general

checklist (“General Unit Requirements,” p. 19) to ensure

that the unit is properly installed and ready for operation.

• Check all electrical connections for tightness and

“point of termination” accuracy.

• Verify that the condenser airflow will be unobstructed.

• Verify that the condenser fan and indoor blower turn

freely without rubbing and are properly tightened on

the shafts.

• Check the supply fan belts for proper tension and the

fan bearings for sufficient lubrication. If the belts

require adjustment, or if the bearings need lubricating,

refer to the maintenance section of this manual for

instructions.

• Verify that a condensate trap is installed and the piping

is properly sized and pitched.

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

place.

• Inspect the interior of the unit for tools and debris and

install all panels in preparation for starting the unit.

Voltage Imbalance

Three phase electrical power to the unit must meet

stringent requirements for the unit to operate properly.

Measure each leg (phase-to-phase) of the power supply.

Table 7. Gas heater operating data

Heating Input Rate—Btu/h(a)

(a) For 50 Hertz applications, multiply rated Btu/h by 83 percent.

135,000 205,000

Minimum Supply Gas Pressure Natural/

LP 3.5” w.c./ 8.0” w.c.

Manifold Gas Pressure(b)

(b)Staged gas heat units have a negative pressure gas valve. Never adjust

the staged gas pressure valve to a positive pressure.

-0.2” w.c

Combustion Blower Suction Pressure (1st

Stage) -2.1 to -3.1”

w.c. -0.8 to -1.2”

w.c.

(With Gas Valve Closed) (2nd Stage) N/A -2.1 to -3.1” w.c.

Minimum Flame Sensing Current (c)

(c) A voltage reading across pens (V+) & (V-) is equatable to the flame sens-

ing current. One volt equals one micro amp.

5.0 Microamps D.C.

Normal Sensing Current Range 8.0 to 16.0 Microamps D.C.

Flue Gas Temperature Rise Above

Ambient 400°F to

500°F 350°F to

475°F

Flue Gas Content - %CO28.3 to 9.5 8.0 to 9.0

Natural LP 9.5 to 10.5

Minimum Supply Air Temperature Across

Heat Exchanger 40°F

Table 8. Piping

Length of

Pipe (ft)

Iron Pipe Size (IPS) Inches

½” Pipe ¾” Pipe 1” Pipe 1¼” Pipe 1½” Pipe

15 76 176 345 750 1220

30 52 120 241 535 850

45 43 99 199 435 700

60 38 86 173 380 610

75 - 77 155 345 545

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

Hr. with Pressure Drop of 0.3" and Specific Gravity of 0.60

Table 9. Specific gravity multipliers

Specific Gravity Multipliers

0.50 1.10

0.55 1.04

0.60 1.00

0.65 0.96

Figure 19. Schematic diagram for field gas piping to

units

Figure 20. Typical unit gas train configuration

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote

disconnects before servicing. Follow proper lockout/

tagout procedures to ensure the power can not be

inadvertently energized. Failure to disconnect power

before servicing could result in death or serious injury.

Installation

28 RT-SVX26L-EN

Each reading must fall within the utilization range stamped

on the unit nameplate. If any of the readings do not fall

within the proper tolerances, notify the power company to

correct this situation before operating the unit.

Excessive three phase voltage imbalance between phases

will cause motors to overheat and eventually fail.

The maximum allowable voltage imbalance is 2 percent.

Measure and record the voltage between phases 1, 2, and

3 and calculate the amount of imbalance as follows:

% Voltage Imbalance =

AV (Average Voltage) =

• V1, V2, V3 = Line Voltage Readings

• VD = Line Voltage reading that deviates the farthest

from the average voltage.

Example: If the voltage readings of the supply power

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

• VD (reading farthest from average) = 221

• The percentage of Imbalance equals:

The 2.2 percent imbalance in this example exceeds the

maximum allowable imbalance of 2.0 percent. This much

imbalance between phases can equal as much as a

20 percent current imbalance with a resulting increase in

motor winding temperatures that will decrease motor life.

If the voltage imbalance is over 2 percent, notify the proper

agencies to correct the voltage problem before operating

this equipment.

Electrical Phasing (Three Phase Motors)

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

internally connected for the proper rotation when the

incoming power supply is phased as A, B, C.

Proper electrical supply phasing can be quickly

determined and corrected before starting the unit by using

an instrument such as an Associated Research Model 45

Phase Sequence Indicator and following the steps below:

• Turn the field supplied disconnect switch that provides

power to the main power terminal block or to the

“Line” side of the optional factory mounted disconnect

switch to the “Off” position.

• Connect the phase sequence indicator leads to the

terminal block or to the “Line” side of the optional

factory mounted disconnect switch as follows;

Black (phase A) to L1

Red (phase B) to L2

Yellow (phase C) to L3

• Close the field supplied main power disconnect switch

or circuit protector switch that provides the supply

power to the unit.

• Observe the ABC and CBA phase indicator lights on the

face of the sequencer. The ABC indicator light will glow

if the phase is ABC. If the CBA indicator light glows,

open the disconnect switch or circuit protection switch

and reverse any two power wires.

• Restore the main electrical power and recheck the

phasing. If the phasing is correct, open the disconnect

switch or circuit protection switch and remove the

phase sequence indicator.

Compressor Crankcase Heaters

Each compressor can be equipped with a crankcase

heater. The proper operation of the crankcase heater is

important to maintain an elevated compressor oil

100 X AV - VD where;

AV

Volt 1 + Volt 2 + Volt 3

3

221 + 230 + 227 = 226 Avg.

3

100 X 226 - 221 = 2.2%

226

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote

disconnects before servicing. Follow proper lockout/

tagout procedures to ensure the power can not be

inadvertently energized. Failure to disconnect power

before servicing could result in death or serious injury.

WARNING

Live Electrical Components!

During installation, testing, servicing and

troubleshooting of this product, it may be necessary to

work with live electrical components. Have a qualified

licensed electrician or other individual who has been

properly trained in handling live electrical components

perform these tasks. Failure to follow all electrical

safety precautions when exposed to live electrical

components could result in death or serious injury.

NOTICE:

Compressors Failure!

Unit must be powered and crankcase heaters energized

at least 8 hours BEFORE compressors are started. This

will protect the compressors from premature failure.

Installation

RT-SVX26L-EN 29

temperature during the “Off” cycle to reduce oil foaming

during compressor starts. Oil foaming occurs when

refrigerant condenses in the compressor and mixes with

the oil. In lower ambient conditions, refrigerant migration

to the compressor could increase.

When the compressor starts, the sudden reduction in

crankcase pressure causes the liquid refrigerant to boil

rapidly causing the oil to foam. This condition could

damage compressor bearings due to reduced lubrication

and could cause compressor mechanical failures.

Before starting the unit in the “Cooling” mode, set the

system switch to the “Off” position and turn the main

power disconnect to the “On” position and allow the

crankcase heater to operate a minimum of 8 hours.

Before closing the main power disconnect switch, insure

that the “System”selection switch is in the “Off” position

and the “Fan” selection switch is in the “Auto” position.

Close the main power disconnect switch and the unit

mounted disconnect switch, if applicable.

ReliaTel Controls

Upon power initialization, the RTRM performs self-

diagnostic checks to insure that all internal controls are

functional. It also checks the configuration parameters

against the components connected to the system.

The Liteport LED located on the RTRM module is turned

“On” within one second of power-up if internal operation

is okay.

Use one of the following “Test” procedure to bypass some

time delays and to start the unit at the control panel.

Each step of unit operation can be activated individually by

temporarily shorting across the “Test” terminals for two to

three seconds. The Liteport LED located on the RTRM

module will blink when the test mode has been initiated.

The unit can be left in any “Test” step for up to one hour

before it will automatically terminate, or it can be

terminated by opening the main power disconnect switch.

Once the test mode has been terminated, the Liteport LED

will glow continuously and the unit will revert to the

“System” control.

Three Stage Cooling

T/YH*150, 180, 210, and 240 models have the ability to

utilize three stages of cooling when the unit is controlled

by a zone sensor. To enable three stages of cooling,

connect wires 36BY and 36BZ.

Important: This is only intended for HIGH EFFICIENCY,

SHORT-ORIFICE UNITS. Disconnecting

these wires will disable three-stage cooling.

4 Stages of Cooling (25 Tons)

25 tons high efficiency units have 4 stages of cooling with

a single compressor and tandem set (similar to variable

speed).

Modulating Gas Heat 5:1 Turndown

(Optional)

The set-up required for equipment ordered with

modulating gas heat varies based on the control system

utilized. Zone sensors, LonTalk, and Comm3/4 do not

require additional set-up.

24 volt control systems (thermostats) require setting the

desired leaving air temperature. The heat exchanger will

modulate to maintain this temperature. Use the following

procedure for set-up:

1. Locate the RTOM

2. Locate the “Discharge Air SP” or “OA CFM SP”

3. Adjust the variable resistor to match the desired

leaving temperature

a. Range = 50°F–150°F

i. Clockwise—Increase Temperature

ii. Counterclockwise—Decrease Temperature

30 RT-SVX26L-EN

Factory-Mounted Unit Options

Circuit Breaker (FIYUCB) & Unit

Disconnect (FIYUDC)

Important: All phases of this installation must comply

with NATIONAL, STATE, and LOCAL

CODES. In addition to local codes, the

installation must comply with National

Electric Code - ANSI/NFPA NO. 70 LATEST

REVISION.

1. Field connections are made by first removing all

access panels on the front of the unit. Unscrew the

assembly around the outside of the disconnect switch

or circuit breaker. This assembly is located between

the evaporator and heat section of the unit (Figure 21,

p. 30).

For downflow configurations, the hole in the base

section is for both high and low voltage power wiring

on down flow units. Horizontal units will route through

the front plate located directly under the circuit breaker

or disconnect panel. The hole is sized for 1 1/2" conduit.

Horizontal units will use the front plate located directly

under the circuit breaker panel.

2. If the conduit required for your application is larger,

remove the termination plate and connect to the larger

hole using field supplied reducing washers.

3. Route the power wires and ground conductor through

conduit and into the bottom of the factory installed

disconnect switch or circuit breaker. Connect the

power conductors to the lugs provided. Connect the

ground wire to the unit ground lug.

Note: Wire size for the length of run should be

determined using the circuit ampacity found on

the unit nameplate and the N.E.C.

4. Route low voltage (class II), control wiring through

hole in base of unit but not through high voltage

conduit. Feed control wiring through bushing provided

on side panel and into the flexible conduit provided in

the heat section of the unit (Figure 21). Route wires

through loose wire ties provided in unit as in Figure 21.

5. Tighten the wire ties. Secure the excess wire bundle

under the wire ties in the outdoor section. Do not leave

excess wire in the electrical enclosure. Use the unit

wiring diagram to make the low voltage connections.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote

disconnects and discharge all motor start/run

capacitors before servicing. Follow proper lockout/

tagout procedures to ensure the power cannot be

inadvertently energized. Verify with an appropriate

voltmeter that all capacitors have discharged. Failure to

disconnect power and discharge capacitors before

servicing could result in death or serious injury.

For additional information regarding the safe discharge

of capacitors, see PROD-SVB06A-EN

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Figure 21. Main power entrance for units with factory

mounted disconnect or circuit breaker

Wire Ties

Factory-Mounted Unit Options

RT-SVX26L-EN 31

Powered and Unpowered

Convenience

Powered Convenience Outlet Powered

Option (FIYCOPO)

When the powered convenience outlet option is installed,

the unit will include a dedicated transformer located in the

evaporator section of the unit. Additionally, a service

receptacle disconnect switch will be provided on the side

wall of the evaporator section. The service receptacle

switch is shipped in the OFF position.

The powered outlet comes completely wired from the

factory except for 208 volt applications.

1. For 208 volt applications, disconnect and tape the blue

230 volt wire.

2. Then connect the brown 208 volt wire.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote

disconnects and discharge all motor start/run

capacitors before servicing. Follow proper lockout/

tagout procedures to ensure the power cannot be

inadvertently energized. Verify with an appropriate

voltmeter that all capacitors have discharged. Failure to

disconnect power and discharge capacitors before

servicing could result in death or serious injury.

For additional information regarding the safe discharge

of capacitors, see PROD-SVB06A-EN

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Figure 22. Wiring schematic 12½ through 25 ton options

Factory-Mounted Unit Options

32 RT-SVX26L-EN

Unpowered Convenience Outlet

Unpowered Option (FIYCOUP)

1. When the unpowered convenience outlet option is

installed, remove the receptacle.

2. The field wiring should be routed through the hole in

the base for downflow applications or front panel for

horizontal applications then through holes provided in

the “J” box (bottom for EMT and top for flexible

conduit).

3. Connect the three (3) wires to terminals inside outlet

box.

Return Air Smoke Detector

Pre-Requisite

Note: The following field installation instructions apply

to downflow only. Horizontal return air smoke

detectors require no field installation.

When a unit is ordered with a downflow economizer and

a return air smoke detector as factory installed options, the

return air smoke detector cannot be completely installed

because the economizer, when it is in the shipping

position, is occupying the space where the return air

smoke detector is to be installed.

The partial assembly and set-up required for each factory

installed economizer must be completed up to the point

where the barometric relief hood is to be installed into the

unit. Prior to this operation, go to Step 5 of this instruction

and perform the operations described there. After this is

completed, the economizer installation is to be completed

in its entirety as outlined in the installation guide.

Smoke Detector Installation

Important: The shipping screw that holds the

barometric relief damper must be removed

before proceeding with the smoke detector

installation.

After completion of the economizer installation as outlined

above, proceed with the installation of the return air

smoke detector as follows:

1. Remove the smoke detector assembly from its

shipping position in the indoor fan compartment. This

assembly is attached with three screws to the indoor

fan board near the top of the unit.

2. Remove and discard the shipping bracket from the

smoke detector assembly. This is the angled piece of

sheet metal that secured the smoke detector assembly

to the interior parts of the unit during shipment.

3. Place the end of the smoke detector 16 inch metal

exhaust tube provided into the bottom hole in the back

of the smoke detector. Line up the tab in the exhaust

tube with one of the slots in the detector and insert the

tube until the tube can be rotated. Rotate the tube 45

degrees to lock it in place.

Figure 23. Power options

A - Powered

B - Powered

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote

disconnects and discharge all motor start/run

capacitors before servicing. Follow proper lockout/

tagout procedures to ensure the power cannot be

inadvertently energized. Verify with an appropriate

voltmeter that all capacitors have discharged. Failure to

disconnect power and discharge capacitors before

servicing could result in death or serious injury.

For additional information regarding the safe discharge

of capacitors, see PROD-SVB06A-EN

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

Figure 24. Brackets

Factory-Mounted Unit Options

RT-SVX26L-EN 33

4. Slide one 2” piece of the vinyl tubing provided onto the

short smoke detector inlet tube which protrudes out of

the back side of the smoke detector. Push this piece of

vinyl tubing onto the inlet tube until it contacts the end

of the plastic extension on the backside of the smoke

detector.

5. Slide the long piece of vinyl tubing provided onto one

leg of the plastic barbed elbow provided. Slide the

other end of this piece of vinyl tubing with the elbow

attached approximately 1” onto the end of the copper

sampling tube installed in the unit’s return air opening.

Position the leg of elbow without the vinyl tubing such

that it points toward the front side of the unit (directly

out of the unit toward the filter access panel).

6. Mount the smoke detector assembly into the unit.

Align the smoke detector (exhaust tube down) with the

holes in the outer panel of the barometric relief hood

and position the smoke detector flush on the panel.

Note: On all units there is a hole with a plastic snap

bushing located on the inner vertical side of the

barometric relief hood that the long exhaust tube

must pass through. Be sure that the exhaust tube is

aligned with this hole before positioning the smoke

detector flush on the outer panel of the barometric

relief hood.

7. Secure the smoke detector to the hood with two #10-16

x 3/4’ sheet metal screws provided.

Note: In order to perform the last part of this operation, it

will be necessary to remove the barometric relief

filter, open the barometric relief damper, and reach

inside through the barometric relief outlet to

access and connect the copper exhaust elbow to

the smoke detector exhaust tube.

8. Connect the leg of the plastic elbow without the vinyl

tubing attached that was installed in Step 5 to the

smoke detector inlet tube pushing it onto the piece of

vinyl tubing attached to the inlet tube.

9. Refer to Figure 26, p. 34 for wire connections of return

air smoke detector to the unit wiring harness.

10. This completes the installation of the return air smoke

detector. If the unit’s air filter(s) and/or barometric relief

filter were removed to ease installation of the smoke

detector, they need to be replaced at this time.

Airflow & Sampling

Refer to the instructions provided below regarding unit

airflow to assure that the return air smoke detector will

function properly.

Important: The return air smoke detector is designed to

shut off the unit if smoke is sensed in the

return air stream. This function is

performed by sampling the airflow entering

the unit at the return air opening. Observe

the following instructions to assure the

airflow through the unit is sufficient for

adequate sampling. Failure to follow these

instructions will prevent the smoke detector

from performing its design function.

Figure 25. Return air smoke detector for downflow units

SMOKE DETECTOR

COPPER TUBE

(FACTORY INSTALLED)

PLASTIC ELBOW

VINYL TUBES (7-3/4 INCHES LONG)

TWO PIECE HOOD

METAL INTAKE TUBE

METAL EXHAUST TUBE

(16.34 INCHES LONG)

VINYL TUBES (2 INCHES LONG)

TUBES INSTALL FROM BOTTOM,

TOP DOES NOT NEED TO BE

REMOVED FROM SMOKE DETECTOR

Factory-Mounted Unit Options

34 RT-SVX26L-EN

In order for the return air smoke detector to properly sense

smoke in the return air stream, the air velocity entering the

unit must be between 500 and 4000 feet per minute. Most

models of equipment covered by this instruction will

develop an airflow velocity that falls within these limits

over the entire airflow range specified in the evaporator

fan performance tables.

Certain models, however, if operated at low airflow, will

not develop an air velocity that falls within the required

500 to 4000 feet per minute range. For these models, the

design airflow shall be greater than or equal to the

minimum specified in Ta b l e 10 .

Notes:

•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.

Important: Refer to the service literature provided for

testing and other information about the

smoke detector or if problems are

encountered.

Table 10. Minimum allowable airflow

Unit Model Number

Minimum Allowable

Airflow with Return Air

Smoke Detector

YSD180, YHD180 5300 CFM

Figure 26. Smoke detector wiring scheme

Factory-Mounted Unit Options

RT-SVX26L-EN 35

Through the Base Gas Utility

Option

This section contains the instructions for making field

connections to the Through the Base Gas Utility Option.

For gas piping, supply, and manifold pressure information

see the unit installation, operation, and maintenance

guide.

Field Installed Connections

Important: All phases of this installation must comply

with NATIONAL, STATE, and LOCAL

CODES. In absence of local codes, the

installation must conform with American

National Standard-Z223.1a- National Fuel

Gas Code Latest Revision.

1. Field connections are made by first removing the

access panel for the heat section on the front of the

unit, Figure 28.

2. The gas piping assembly ships inside this section and

includes the shut-off valve, a pressure tap for testing,

and the necessary unions for field connection. For

through the base access, remove the factory-provided

cap from the base pan opening. See Figure 27.

3. Route field piping through this hole to the dimension

shown in Ta b l e 11 .

4. Place the assembly through the cabinet opening as

shown in Figure 28 and make the union connection to

the field piping and to the gas train. Refer to the unit

IOM for checkout procedures.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote

disconnects and discharge all motor start/run

capacitors before servicing. Follow proper lockout/

tagout procedures to ensure the power cannot be

inadvertently energized. Verify with an appropriate

voltmeter that all capacitors have discharged. Failure to

disconnect power and discharge capacitors before

servicing could result in death or serious injury.

For additional information regarding the safe discharge

of capacitors, see PROD-SVB06A-EN

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

WARNING

Outlet Pressure Check Required!

This unit uses a negative pressure gas valve. At start-

up, the outlet pressure should be checked and adjusted

if required to a negative -0.2 inches of water column.

Never adjust the regulator to a positive pressure.

Failure to follow instructions could result in death or

serious injury or equipment damage.

Table 11. Piping hole dimension

Model Dimension

YS*150-300, YH*150-300 1 3/16"

Figure 27. Through the base opening

Figure 28. Gas piping

36 RT-SVX26L-EN

Pre Start

Test Modes

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

cycled at LTB-Test 1 and LTB-Test 2.

1. Step Test Mode—This method initiates the different

components of the unit, one at a time, by temporarily

shorting across the two test terminals for two to three

seconds.

For the initial start-up of the unit, this method allows

the technician to cycle a component “On” and have up

to one hour to complete the check.

2. Resistance Test Mode—This method can be used for

start-up providing a decade box for variable resistance

outputs is available. This method initiates the different

components of the unit, one at a time, when a specific

resistance value is placed across the two test

terminals. The unit will remain in the specific test mode

for approximately one hour even though the

resistance is left on the test terminals.

3. Auto Test Mode—This method is not recommended

for start-up due to the short timing between individual

component steps. This method initiates the different

components of the unit, one at a time, when a jumper

is installed across the test terminals. The unit will start

the first test step and change to the next step every

30 seconds. At the end of the test mode, control of the

unit will automatically revert to the applied “System”

control method.

For unit test steps, test modes, and step resistance values

to cycle the various components, refer to Ta b l e 1 2 .

Verifying Proper Air Flow (Units

with Belt Drive Indoor Fan)

Much of the systems performance and reliability is closely

associated with, and dependent upon having the proper

airflow supplied both to the space that is being

conditioned and across the evaporator coil.

The indoor fan speed is changed by opening or closing the

adjustable motor sheave.

Before starting the SERVICE TEST, set the minimum

position setpoint for the economizer to 0% using the

setpoint potentiometer located on the Economizer Control

(ECA), if applicable.

ReliaTel Control

Using the Service Test Guide in Ta b l e 1 2 , momentarily

jump across the Test 1 and Test 2 terminals on LTB1 one

time to start the Minimum Ventilation Test.

Once the supply fan has started, check for proper rotation.

The direction of rotation is indicated by an arrow on the fan

housing.

With the fan operating properly, determine the total

system airflow (cfm):

1. Measure the actual rpm.

2. Measure the amperage at the supply fan contactor and

compare it with the full load amp (FLA) rating stamped

on the motor nameplate.

a. Calculate the theoretical bhp:

b. Using the fan performance tables in the unit Service

Facts, plot the actual rpm (Step 1) and the bhp (Step

2a) to obtain the operating cfm.

3. If the required cfm is too low, (external static pressure

is high causing motor horsepower output to be below

table value):

a. Relieve supply and/or return duct static.

b. Change indoor fan speed and repeat Step 1 and

Step 2.

4. To increase fan rpm, loosen the pulley adjustment set

screw and turn sheave clockwise.

5. To decrease fan rpm, loosen the pulley adjustment set

screw and turn sheave counterclockwise.

6. If the required cfm is too high, (external static pressure

is low causing motor horsepower output to be above

table value), change indoor fan speed and repeat Step

1 and Step 2.

7. To stop the SERVICE TEST, turn the main power

disconnect switch to the “Off” position or proceed to

the next component start-up procedure. Remove

electro mechanical test mode connections (if

applicable).

Table 12. Service test guide for component operation

TEST

STEP MODE Fan Econ(a)

(a)The exhaust fan will turn on anytime the economizer damper position is

equal

Comp

1

Comp

2 Heat

1 Heat

2Ohm

1Fan On

Minimum

Position

Setpoint

0%

Off Off Off Off 2.2K

Minimum

Ventilation On Select-

able Off Off Off Off

2Economizer

Test Open On Open Off Off Off Off 3.3K

3Cool Stage

1 On Minimum

Position On(b)

(b)The condenser fans will operate any time a compressor is “On.”

Off Off Off 4.7K

4(c)

(c) Steps for optional accessories and non-applicable modes in unit will be

skipped.

Cool Stage

2On Minimum

Position On(b) On(b) Off Off 6.8K

5(c) Reheat On Minimum On On Off Off 33K

6(c) Heat Stage

1On Minimum Off Off On Off 10K

7(c) Heat Stage

2On Minimum Off Off On On 15K

Actual Motor Amps X Motor HP

Motor Nameplate Amps

RT-SVX26L-EN 37

Start Up

Economizer Start-Up

Using the Service Test Guide in Ta b le 12 , p. 3 6,

momentarily jump across the Test 1 and Test 2 terminals

on LTB1 one-time to start the Minimum Ventilation Test.

1. Set the minimum position setpoint for the economizer

to the required percentage of minimum ventilation

using the setpoint potentiometer located on the

Economizer Control (ECA).

The economizer will drive to its minimum position

setpoint, exhaust fans (if applicable) may start at

random, and the supply fan will start when the

SERVICE TEST is initiated.

The Exhaust Fan will start anytime the economizer

damper position is equal to or greater than the exhaust

fan setpoint.

2. Verify that the dampers stroked to the minimum

position.

3. Momentarily jump across the Test 1 and Test 2

terminals on LTB one additional time if continuing

from previous component start-up or until the desired

start-up component Test is started.

4. Verify that the dampers stroked to the full open

position.

5. To stop the SERVICE TEST, turn the main power

disconnect switch to the “Off” position or proceed to

the next component start-up procedure. Remove

electro mechanical test mode connections (if

applicable).

Compressor Start-Up

1. Attach a set of service gauges onto the suction and

discharge gauge ports for each circuit. Refer to the

refrigerant circuit illustration in the Service Facts.

Using the Service Test Guide in Tab l e 12, p. 3 6,

continue the Service Test start-up procedure for each

compressor circuit.

Momentarily jump across the Test 1 and Test 2

terminals on LTB1 one additional time if continuing

from previous component start-up or until the desired

startup component Test is started.

Scroll Compressors

a. Once each compressor has started, verify that the

rotation is correct. If wired correctly the suction

pressure should drop and the discharge pressure

should rise. If a scroll compressor is rotating

backwards, it will not pump and a loud rattling

sound can be observed.

b. If the electrical phasing is correct, before

condemning a compressor, interchange any two

leads (at the compressor Terminal block) to check

the internal phasing. Refer to the following

illustration for the compressor terminal/phase

identification. Do not allow the compressor to

operate backwards for more than 5 seconds.

Operation for a period of time longer than this will

result in compressor damage. Copeland (Alliance)

will experience failure also. If the compressor runs

backward for an extended period, the motor

winding can overheat and cause the motor winding

thermostat to open.

Note: The Copeland, SSA and SPA scroll compressors for

R-410A units use Trane OIL00094. The correct oil for

Trane CSHD is Trane OIL00079 or OIL00080.

Compressor types are listed in Table 13, p. 37. The

appropriate oil charge is listed in Table 14, p. 38.

Figure 29. Compressor terminal box

Table 13. Compressor types

Tonnage C1 C2

YS*150 SSA067 SSA054

YH*150 ZP91KCE ZP38K5E

YH*150 Reheat ZP67KCE ZP67KCE

YS*180/155 CSHD105 SPA050 (SPA054 on 380V/60Hz/

3Ph units only)

YH*180 ZP104KCE ZP49K5E

YH*180 Reheat ZP83KCE ZP83KCE

YS*210/175 CSHD120 SPA044 (SPA054 on 380V/60Hz/

3Ph units only)

YH*210 ZP122KCE ZP54K5E

YH*210 Reheat CSHD089 ZP83KCE

YS*240/200 CSHD142 SSA083

YH*240 CSHD142K*0M ZP61KCE

YH*240 Reheat CSHD120 CSHD120

YS*300/250 CSHD120 CSHD120

YH*300 ZPT122K5E ZP122KCE

Start Up

38 RT-SVX26L-EN

2. After the compressor and condenser fan have started

and operated for approximately 30 minutes, observe

the operating pressures. Compare the operating

pressures to the operating pressure curve in the

Service Facts.

3. Check system subcooling. Follow the instruction listed

on the subcooling charging curve in the Service Facts.

4. Repeat Step 1 through Step 3 for each refrigerant

circuit.

5. To stop the SERVICE TEST, turn the main power

disconnect switch to the “Off” position or proceed to

the next component start-up proc

6. edure. Remove electro mechanical test mode

connections (if applicable).

Dehumidification Option

Momentarily jump across the Test 1 and Test 2 terminals of

the LTB1 until the unit enters test mode 7. (Table 12, p. 36)

Once the unit is in the reheat test mode, verify that the

three-way valve has shifted to the reheat position and that

the supply temperature rises 10°F more than when in

cooling mode stage 2. Monitor the suction pressure for 15

minutes. The suction pressure should remain within 5 psi

of normal cooling operation.

Heating Start-Up

Open the main disconnect switch to shut the unit off and

to reset the RTRM.

Follow the Test Guide in Table 12, p. 36 to start the unit in

the heating mode. ReliaTel Control Momentarily jump

across the Test 1 and Test 2 terminals on LTB1 one

additional time if continuing from previous component

start-up or until the desired start-up component Test is

started.

Note: At initial start-up modulating gas heat exchangers

can produce a resonance that will subside after the

break-in period.

Variable Air Volume Applications

(Multi-zone, Traditional VAV)

Traditional VAV Standalone Operation

If a traditional VAV unit is required to operate without ICS,

BAS, or other “front end” controller, a jumper must be

placed between J6-2 and J6-4 of the RTRM to allow local

standalone control.

Supply Air Temperature Control -

Occupied Cooling and Heating

The RTRM is designed to maintain a selectable supply air

temperature of 40ºF to 80ºF with a +/- 3.5ºF deadband. To

reduce the risk of coil freezing, it is not recommended to

set the supply air temperature below 50ºF. In cooling

mode, if the supply air temperature is more than 3.5ºF

warmer than the selected temperature, a stage of cooling

will be turned ‘on’ (if available). Also, if the supply air

temperature is more than 3.5ºF cooler than the selected

temperature, a stage of cooling will be turned ‘off’. At very

low airflow, the unit may cycle stages ‘on’ and ‘off’ to

maintain an average discharge air temperature outside the

7 degrees deadband.

If the unit has modulating gas heat, it can be made to

discharge heating with VAV control. This is done by

placing a contact closure across the ‘Changeover Input’ on

the RTAM. While in the mode, the unit will heat to the

Supply Air Heating Setpoint +/- 3.5ºF. During low loads, or

low airflow conditions, the actual temperature swing of

the discharge air will likely be greater.

The RTRM utilizes a proportional and integral control

scheme with the integration occurring when the supply air

temperature is outside the deadband. As long as the

supply air temperature is within the setpoint deadband,

the system is considered to be satisfied and no staging up

or down will occur.

Supply Duct Static Pressure Control

The supply duct static pressure is measured by a

transducer with a 0.25 to 2.125 Vdc proportional output

which corresponds to an adjustable supply duct static

pressure of 0.3" w.c. to 2.5" w.c. respectively with a

deadband adjustment range from 0.2" w.c. to 1.0" w.c. The

setpoint is adjustable on the RTAM Static Pressure

Setpoint potentiometer or through ICS.

Example:

Table 14. POE Oil recharge amount (fl. oz.)

Model C1

25mm/18mm C2

25mm/18mm

YS*150 56/105.6 62/99.2

YH*150 56 38

YH*150 Reheat 56 56

YS*180/155 112/182.4 62 (62)/96

YH*180 81 38

YH*180 Reheat 56 56

YSH210, YS*175 112/182.4 38 (62)/96

YS*210/175 112 38 (62)

YH*210 81 38

YH*210 Reheat 102 56

YS*240/200 112 56

YH*240 112 38

YH*240 Reheat 112 112

YS*300/250 112 106

YH*300 76(a)

(a) This is the total amount for both compressors (38oz per com-

pressor).

81

Start Up

RT-SVX26L-EN 39

Supply Duct Static Setpoint = 2.0" w.c.

(RTAM) deadband = 0.2" w.c. (RTAM)

Duct Static Control Range = 1.9" w.c. to 2.1" w.c.

VHR Relay Output

For standalone VAV unit operation, the VHR output should

be wired to drive VAV boxes to maximum position during

all heating modes and unoccupied periods. The VHR

contacts are shown in the de-energized position and will

switch (energize) during the above mentioned operating

modes.

To configure the proper potentiometer setpoints, connect

a multi-meter across the customer connection header (J7)

to the pins listed in Tabl e 16 below.

Figure 30. Supply duct static pressure control

Figure 31. VHR relay output

Table 15. Variable air volume mode operation

System Mode Fan “Auto” Fan “On”

Heat DWU Active

DWU Off DWU2

Off4DWU2

VAV Heating4

Cool VAV Cooling1VAV Cooling1

Auto DWU Active

DWU Off

DWU or

Cooling1,2,3,4

VAV Cooling1

DWU or

Cooling1,2,3,4

VAV Cooling or

Heating1

Off Off4 Off4

Notes:

1. If Cooling is selected the supply fan will run continuously. If VAV

Heating is activated the supply fan will run continuously.

2. If Daytime Warmup is Activated, the supply fan will run

continuously.

3. Auto changeover between Cooling and Daytime

Warmup depends upon the DWU initiate setpoint.

4. The fan will be Off any time the system selection switch

is “Off”.

Table 16. VAV setpoints

Supply Air Cooling

Setpoint (J7-3,4)

Resistance (Ohms) DC volts Deg F

240 0.97 50.37

280 1.09 52.30

320 1.21 54.24

360 1.32 56.09

410 1.45 58.18

450 1.55 59.80

Supply Air Pressure

Setpoint (J7-1,2)

Resistance (Ohms) DC volts “WC

100 0.45 0.30

350 1.30 0.98

540 1.75 1.49

730 2.11 2.00

>900 >2.38 2.5

Note: To reduce the risk of coil freezing, it is not recommended to set the

supply air temperature setpoint below 50°F.

Start Up

40 RT-SVX26L-EN

Final System Set Up

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

procedures outlined in the previous sections (i.e.,

operating the unit in each of its modes through all

available stages of cooling and heating), perform these

final checks before leaving the unit:

• Program the Night Setback (NSB) panel (if applicable)

for proper unoccupied operation. Refer to the

programming instructions for the specific panel.

• Verify that the Remote panel “System” selection

switch, “Fan” selection switch, and “Zone

Temperature” settings for automatic operation are

correct.

• Inspect the unit for misplaced tools, hardware, and

debris.

• Verify that all exterior panels including the control

panel doors and condenser grilles are secured in place.

• Close the main disconnect switch or circuit protector

switch that provides the supply power to the unit’s

terminal block or the unit mounted disconnect switch.

Figure 32. RTAM module

Static

pressure

setpoint

Static

pressure

deadband For remote deadband cut

this jumper

Reset

setpoint

Supply Air Heating

Setpoint

R66

Reset

amount

Supply air

cooling

setpoint

Morning

warmup

setpoint

R63 R68

R69

R67

R64

1 2 3 4 5 6 7 8 9 10 11 12

Remote setpoint

terminal strip

12345

SW1

Supply Air (Static) Pressure S.P.

DIP switch

1

IGU Config

Reset Select

DWU Enable

VAV w/o IGV

IGV - OFF OFF

VFD - ON OFF

12

No Reset OFF OFF

Return Air OFF ON

Zone Temp ON OFF

Outdoor Air ON ON

34

5

DWU Disable OFF

DWU Enable ON

ON

Supply Air Cooling Setpoint

Supply Air Reset Amount

Supply Air (Static) Pressure Deadband

Morning Warmup Setpoint

Supply Air Reset Setpoint

OFF ON

ON ON

23 45

SW1

R 75

13 14

Supply Air Heating Setpoint

RT-SVX26L-EN 41

Maintenance

Make sure all personnel are standing clear of the unit

before proceeding. The system components will start

when the power is applied.

Fan Belt Adjustment—Belt Drive

Units

The fan belts must be inspected periodically to assure

proper unit operation.

Replacement is necessary if the belts appear frayed or

worn. Units with dual belts require a matched set of belts

to ensure equal belt length.

When removing or installing the new belts, do not stretch

them over the sheaves. Loosen the belts using the belt

tension adjustment bolts on the motor mounting base.

Once the new belts are installed, using a Browning or

Gates tension gauge (or equivalent) illustrated in

Figure 33; adjust the belt tension as follows;

1. To determine the appropriate belt deflection;

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

inches) between the fan and motor sheaves.

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

resulting value represents the amount of belt

deflection that corresponds to the proper belt

tension.

2. Set the large O-ring on the belt tension gauge at the

deflection value determined in Step 1b.

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

gauge plunger.

4. Place the large end of the gauge at the center of the belt

span; then depress the gauge plunger until the large

O-ring is even with the top of the next belt or even with

a straightedge placed across the fan and motor

sheaves.

Refer to Tabl e 1 7, p. 4 1 .

5. Remove the belt tension gauge. The small O-ring now

indicates a number other than zero on the plunger’s

force scale. This number represents the force (in

pounds) required to give the needed deflection.

6. Compare the “force” scale reading (Step 5) with the

appropriate “force” value listed in Tabl e 17, p . 4 1. If the

“force” reading is outside the range, readjust the belt

tension.

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

maximum “force” value shown in Tabl e 17, p . 4 1.

7. Recheck the belt tension at least twice during the first

2 to 3 days of operation. Belt tension may decrease

until the new belts are “run in”.

WARNING

Rotating Components!

The following procedure involves working with rotating

components. Disconnect all electric power, including

remote disconnects before servicing. Follow proper

lockout/tagout procedures to ensure the power can not

be inadvertently energized. Failure to disconnect power

before servicing could result in rotating components

cutting and slashing technician which could result in

death or serious injury.

Figure 33. Belt tension gauge

Table 17. Belt tension measurement and deflection

ranges

Belts

Cross

Section

Small

P.D

Range

(in.)

Deflection Force (lb)

Super

Gripbelts

(in.) Gripnotch

(in.)

Steel Cable

Gripbelts

(in.)

Min. Max. Min. Max Min. Max.

A

3.0–3.6 3 4 1/2 3 7/8 5 1/2 3 1/4 4

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

5.0–7.0 4 5 1/2 5 6 7/8 4 1/4 5 1/4

B

3.4–4.2 4 5 1/2 5 3/4 8 4 1/2 5 1/2

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

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

Belts

Cross

Section

Small P.D

Range

(mm)

Deflection Force (kg)

Super

Gripbelts

(mm) Gripnotch

(mm)

Steel Cable

Gripbelts

(mm)

Min. Max. Min. Max. Min. Max

A

13.3–16.0 13.3 20.0 17.2 24.5 14.5 17.8

16.9–21.4 15.6 22.2 20.0 27.8 16.7 21.1

22.0–31.1 17.8 24.5 22.2 30.6 18.9 23.4

B

15.1–18.7 17.8 24.5 25.6 35.6 20.0 24.5

19.6–24.9 22.8 31.7 28.9 40.6 25.6 32.3

25.8–39.1 28.4 38.9 32.8 45.0 31.1 38.9

Maintenance

42 RT-SVX26L-EN

Monthly Maintenance

Before completing the following checks, turn the unit OFF

and lock the main power disconnect switch open.

Filters

Inspect the return air filters. Clean or replace them if

necessary. Refer to the unit Service Facts for filter

information.

Return Air Smoke Detector Maintenance

Airflow through the unit is affected by the amount of dirt

and debris accumulated on the indoor coil and filters.

To insure that airflow through the unit is adequate for

proper sampling by the return air smoke detector,

complete adherence to the maintenance procedures,

including recommended intervals between filter changes,

and coil cleaning is required.

Periodic checks and maintenance procedures must be

performed on the smoke detector to insure that it will

function properly.

For detailed instructions concerning these checks and

procedures, refer to the appropriate section(s) of the

smoke detector Installation and Maintenance Instructions

provided with the literature package for this unit.

Condensate Overflow Switch

During maintenance, the switch float (black ring) must be

checked to ensure free movement up and down.

Cooling Season

• Check the unit’s drain pans and condensate piping to

ensure that there are no blockages.

• Inspect the evaporator and condenser coils for dirt,

bent fins, etc. If the coils appear dirty, clean them

according to the instructions described in “Condenser

Coil Cleaning,” p. 42.

• Manually rotate the condenser fan(s) to ensure free

movement and check motor bearings for wear. Verify

that all of the fan mounting hardware is tight.

• Inspect the F/A-R/A damper hinges and pins to ensure

that all moving parts are securely mounted. Keep the

blades clean as necessary.

• Verify that all damper linkages move freely; lubricate

with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the

motor as necessary.

• Check the fan shaft bearings for wear. Replace the

bearings as necessary.

• Check the supply fan belt. If the belt is frayed or worn,

replace it. Refer to “Fan Belt Adjustment—Belt Drive

Units,” p. 41 for belt replacement and adjustments.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present on the exterior surfaces

of the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g.,

loose access panels, leaking piping connections, etc.).

• Make sure that all retaining screws are reinstalled in

the unit access panels once these checks are complete.

• With the unit running, check and record the: ambient

temperature; compressor suction and discharge

pressures (each circuit); superheat (each circuit);

Record this data on an “operator’s maintenance log”

like the one shown in Table 18, p. 43. If the operating

pressures indicate a refrigerant shortage, measure the

system superheat. For guidelines, refer to

“Compressor Start-Up,” p. 37.

Note: Do NOT release refrigerant to the atmosphere! If

adding or removing refrigerant is required, the

service technician must comply with all federal,

state and local laws.

Heating Season

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

replace them.

• Check supply fan motor bearings; repair or replace the

motor as necessary.

• Inspect both the main unit control panel and heat

section control box for loose electrical components

and terminal connections, as well as damaged wire

insulation. Make any necessary repairs.

• Verify that the electric heat system operates properly.

Condenser Coil Cleaning

Regular coil maintenance, including annual cleaning,

enhances the unit’s operating efficiency by minimizing:

compressor head pressure and amperage draw;

evaporator water carryover; fan brake horsepower, due to

increase static pressure losses; airflow reduction.

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

in a “dirty” environment, clean the condenser coils using

the instructions outlined below. Be sure to follow these

instructions as closely as possible to avoid damaging the

coils.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote

disconnects before servicing. Follow proper lockout/

tagout procedures to ensure the power can not be

inadvertently energized. Failure to disconnect power

before servicing could result in death or serious injury.

Maintenance

RT-SVX26L-EN 43

Microchannel (MCHE) Coils

Due to the soft material and thin walls of the MCHE coils,

the traditional field maintenance method recommended

for Round Tube Plate Fin (RTPF) coils does not apply to

microchannel coils.

Moreover, chemical cleaners are a risk factor to MCHE due

to the material of the coil. The manufacturer does not

recommend the use of chemical cleaners to clean

microchannel coils. Using chemical cleaners could lead to

warranty claims being further evaluated for validity and

failure analysis.

The recommended cleaning method for microchannel

condenser coils is pressurized water or air with a non-

pinpoint nozzle and an ECU of at least 180 with pressure no

greater than 600 psi. To minimize the risk of coil damage,

approach the cleaning of the coil with the pressure washer

aimed perpendicular to the face of the coil during cleaning.

Optimum clearance between the sprayer nozzle and the

microchannel coil is 1”–3”.

Final Process

For future reference, you may find it helpful to record the

unit data requested below in the blanks provided.

(1) Complete Unit Model Number:

_____________________________________________________

(2) Unit Serial Number:

_____________________________________________________

(3) Wiring Diagram Numbers (from unit control panel)

— schematic(s)

_____________________________________________________

_____________________________________________________

— connection(s)

_____________________________________________________

____________________________________________________

_

NOTICE:

Coil Damage!

DO NOT use any detergents with microchannel

condenser coils. Use pressurized water or air ONLY,

with pressure no greater than 600psi. Failure to do so

could result in coil damage.

For additional information regarding the proper

microchannel coil cleaning procedure, refer to RT-

SVB83*-EN.

Table 18. Sample maintenance log

Date

Current

Ambient

Temp F/C

Refrigerant Circuit #1 Refrigerant Circuit #2

Compr.

Oil Level

Suct.

Press.

Psig/kPa

Disch.

Press

Psig/kPa

Liquid

Press

Psig/kPa Super-

heat F/C Sub-cool

F/C Compr.

Oil Level

Suct.

Press.

Psig/kPa

Disch.

Press

Psig/kPa

Liquid

Press

Psig/kPa Super-

heat F/C Sub-cool

F/C

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

- ok

- low - ok

- low

44 RT-SVX26L-EN

Troubleshooting

ReliaTel Control

The RTRM has the ability to provide the service personnel

with some unit diagnostics and system status information.

Before turning the main power disconnect switch “Off”,

follow the steps below to check the ReliaTel™

Refrigeration Module (RTRM). All diagnostics and system

status information stored in the RTRM will be lost when

the main power is turned “Off”.

To prevent injury or death from electrocution, it is the

responsibility of the technician to recognize this hazard

and use extreme care when performing service

procedures with the electrical power energized.

1. Verify that the Liteport LED on the RTRM is burning

continuously. If the LED is lit, go to Step 3.

2. If the LED is not lit, verify that 24 Vac is presence

between J1-1 and J1-2. If 24 Vac is present, proceed to

Step 3.

If 24 Vac is not present, check the unit main power

supply, check transformer (TNS1). Proceed to Step 3 if

necessary.

3. Utilizing “Method 1” or “Method 2” in the “System

Status Checkout Procedure, check the following:

System status

Heating status

Cooling status

If a System failure is indicated, proceed to Step 4. If no

failures are indicated, proceed to Step 5.

4. If a System failure is indicated, recheck Step 1 and Step

2. If the LED is not lit in Step 1, and 24 Vac is present in

Step 2, the RTRM has failed. Replace the RTRM.

5. If no failures are indicated, use one of the TEST mode

procedures described in “Start Up,” p. 37 to start the

unit. This procedure will allow you to check all of the

RTRM outputs, and all of the external controls (relays,

contactors, etc.) that the RTRM outputs energize, for

each respective mode. Proceed to Step 6.

6. Step the system through all of the available modes,

and verify operation of all outputs, controls, and

modes. If a problem in operation is noted in any mode,

you may leave the system in that mode for up to one

hour while troubleshooting. Refer to the sequence of

operations for each mode, to assist in verifying proper

operation. Make the necessary repairs and proceed to

Step 7 and Step 8.

7. If no abnormal operating conditions appear in the test

mode, exit the test mode by turning the power “Off” at

the main power disconnect switch.

8. Refer to the individual component test procedures if

other microelectronic components are suspect.

System Status Checkout

Procedure

“System Status” is checked by using one of the following

two methods:

Method 1

If the Zone Sensor Module (ZSM) is equipped with a

remote panel with LED status indication, you can check the

unit within the space. If the ZSM does not have LEDs, use

“Method 2,” p. 45.

BAYSENS110* and BAYSENS119* have the remote panel

indication feature.

The LED descriptions are listed below.

• LED 1 (System)

– “On” during normal operation.

– “Off” if a system failure occurs or the LED fails.

– “Flashing” indicates test mode.

• LED 2 (Heat)

– “On” when the heat cycle is operating.

– “Off” when the heat cycle terminates or the LED

fails.

– “Flashing” indicates a heating failure.

• LED 3 (Cool)

– “On” when the cooling cycle is operating.

– “Off” when the cooling cycle terminates or the LED

fails.

– “Flashing” indicates a cooling failure.

• LED 4 (Service)

– “On” indicates a clogged filter.

– “Off” during normal operation.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could result

in exposure to electrical, mechanical or other potential

safety hazards. Always refer to the safety warnings

provided throughout this manual concerning these

procedures. Unless specified otherwise, disconnect all

electrical power including remote disconnect and

discharge all energy storing devices such as capacitors

before servicing. Follow proper lockout/tagout

procedures to ensure the power can not be

inadvertently energized. When necessary to work with

live electrical components, have a qualified licensed

electrician or other individual who has been trained in

handling live electrical components perform these

tasks. Failure to follow all of the recommended safety

warnings provided, could result in death or serious

injury.

Troubleshooting

RT-SVX26L-EN 45

– “Flashing” indicates an evaporator fan failure or a

Condenser Overflow Switch (COF) failure.

The following is the complete listing of indication causes:

System Failure

Check the voltage between terminals and 9 on J6, it should

read approximately 32 Vdc. If no voltage is present, a

System failure has occurred. Refer to Step 4 in the

previous section for the recommended troubleshooting

procedure.

Heating Failure

Verify Heat Failure by Ignition Module

(IGN) LED indicator:

OFF: No Power or Failure

ON: Normal

Slow Flash: Normal, Heat Call

Fast Flash: Error Code:

1 Flash: Communication Failure

2 Flashes: System Lockout

4 Flashes TC01 or TC02 Open

5 Flashes: Flame w/o Gas Valve

Cooling Failure

1. Cooling and heating set point (slide pot) on the zone

sensor has failed. Refer to “Zone Temperature Sensor

(ZTS) Test,” p. 46.

2. Zone temperature thermistor ZTEMP on ZTS failed.

Refer to “Zone Temperature Sensor (ZTS) Test,” p. 46.

3. CC1 or CC2 24 Vac control circuit has opened, check

CC1 and CC2 coils, and any of the controls below that

apply to the unit (HPC1, HPC2).

4. LPC1 has opened during the three-minute minimum

“on time” during consecutive compressor starts, check

LPC1 or LPC2 by testing voltage between the J1-8 and

J3-2 terminals on the RTRM and ground. If Vac is

present, the LPCs has not tripped. If no voltage is

present, LPCs has tripped.

Service Failure

1. If the supply fan proving switch has closed, the unit will

not operate (when connected to RTOM), check the fan

motor, belts, and proving switch.

2. If the clogged filter switch has closed, check the filters.

Simultaneous Heat and Cool Failure

• Emergency Stop is activated.

Method 2

The second method for determining system status is done

by checking voltage readings at the RTRM (J6). The system

indication descriptions and the approximate voltages are

listed below.

System Failure

Measure the voltage between terminals J6-9 and J6-6.

• Normal Operation = approximately 32 Vdc

• System Failure = less than 1 Vdc, approximately

0.75 Vdc

• Test Mode = voltage alternates between 32 Vdc and

0.75 Vdc

Heat Failure

Measure the voltage between terminals J6-7 and J6-6.

• Heat Operating = approximately 32 Vdc

• Heat Off = less than 1 Vdc, approximately 0.75 Vdc

• Heating Failure = voltage alternates between 32 Vdc

and 0.75 Vdc

Cool Failure

Measure the voltage between terminals J6-8 and J6-6.

• Cool Operating = approximately 32 Vdc

• Cool Off = less than 1 Vdc, approximately 0.75 Vdc

• Cooling Failure = voltage alternates between 32 Vdc

and 0.75 Vdc

Service Failure

Measure the voltage between terminals J6-10 and J6-6.

• Clogged Filter = Approximately 32 Vdc.

• Normal = Less than 1 Vdc, approximately 0.75 Vdc

• Fan Failure = voltage alternates between 32 Vdc and

0.75 Vdc.

Note: If the Condensate Overflow Switch is closed, the

unit will not operate. Check to make sure the float

position is not in a tripped condition and verify an

"open" between wires connecting to RTOM J6-1,

J6-2.

To use LEDs for quick status information at the unit,

purchase a BAYSENS110* ZSM and connect wires with

alligator clamps to terminals 6 through 10. Connect each

respective terminal wire (6 through 10) from the Zone

Sensor to the unit J6 terminals 6 through 10.

Note: If the system is equipped with a programmable

zone sensor, (BAYSENS119*), the LED indicators

will not function while the BAYSENS110* is

connected.

Resetting Cooling and Heating

Lockouts

Cooling Failures and Heating Lockouts are reset in an

identical manner.

“Method 1,” p. 46 explains resetting the system from the

space; “Method 2,” p. 46 explains resetting the system at

the unit.

Troubleshooting

46 RT-SVX26L-EN

Note: Before resetting Cooling Failures and Heating

Lockouts check the Failure Status Diagnostics by

the methods previously explained. Diagnostics will

be lost when the power to the unit is disconnected.

Method 1

To reset the system from the space, turn the “Mode”

selection switch at the zone sensor to the “Off” position.

After approximately 30 seconds, turn the “Mode”

selection switch to the desired mode, i.e. Heat, Cool or

Auto.

Method 2

To reset the system at the unit, cycle the unit power by

turning the disconnect switch “Off” and then “On”.

Lockouts can be cleared through the building

management system. Refer to the building management

system instructions for more information.

Zone Temperature Sensor (ZTS)

Service Indicator

The ZSM SERVICE LED is a generic indicator, that will

signal the closing of a Normally Open switch at any time,

providing the Indoor Motor (IDM) is operating.

This indicator is usually used to indicate a clogged filter, or

an air side fan failure.

The RTRM will ignore the closing of this Normally Open

switch for 2 (±1) minutes. This helps prevent nuisance

SERVICE LED indications. The exception is the LED will

flash 40 seconds after the fan is turned “On” if the Fan

Proving Switch is not made.

Clogged Filter Switch

This LED will remain lit the entire time that the Normally

Open switch is closed. The LED will be turned off

immediately after resetting the switch (to the Normally

Open position), or any time that the IDM is turned “Off”.

If the switch remains closed, and the IDM is turned “On”,

the SERVICE LED will be turned “On” again after the 2 (±1)

minute ignore delay.

This LED being turned “On”, will have no other affect on

unit operation. It is an indicator only.

Fan Failure Switch

When the “Fan Failure” switch is wired to the RTOM, the

LED will remain flashing the entire time the fan proving

switch is closed, indicating a fan failure, and it will shut the

unit operations down.

Condensate Overflow Switch

When the condensate overflow switch is closed, a drain

pan overflow condition is indicated and it will shut unit

operations down.

Zone Temperature Sensor (ZTS)

Test

Note: These procedures are not for programmable or

digital models and are conducted with the Zone

Sensor Module electrically removed from the

system.

Test 1

Zone Temperature Thermistor (ZTEMP)

This component is tested by measuring the resistance

between terminals 1 and 2 on the Zone Temperature

Sensor. Below are some typical indoor temperatures, and

corresponding resistive values.

Test 2

Cooling Set Point (CSP) and Heating Set Point (HSP) The

resistance of these potentiometers are measured between

the following ZSM terminals. Refer to Ta b l e 19 for

approximate resistances at the given setpoints.

Cool SP = Terminals 2 and 3

Range = 100 to 900 Ohms approximate

Heat SP = Terminals 2 and 5

Range = 100 to 900 Ohms approximate

Test 3

System Mode and Fan Selection

The combined resistance of the Mode selection switch and

the Fan selection switch can be measured between

terminals 2 and 4 on the Zone Sensor. The possible switch

combinations are listed Table 21, p. 47 with their

corresponding resistance values.

Table 19. Temps and resistance values

Zone

Temperature Nominal ZTEMP

Resistance (K-

Ohms) Nominal CSP or HSP

Resistance (Ohms)(°F) (°C)

50 10.0 19.9 889

55 12.8 17.47 812

60 15.6 15.3 695

65 18.3 13.49 597

70 21.1 11.9 500

75 23.9 10.50 403

80 26.7 9.3 305

85 29.4 8.25 208

90 32.2 7.3 110

Troubleshooting

RT-SVX26L-EN 47

Test 4

LED Indicator Test, (SYS ON, HEAT, COOL &

SERVICE)

Method 1

Testing the LED using a meter with diode test function. Test

both forward and reverse bias. Forward bias should

measure a voltage drop of 1.5 to 2.5 volts, depending on

your meter. Reverse bias will show an Over Load, or open

circuit indication if LED is functional.

Method 2

Testing the LED with an analog Ohmmeter. Connect

Ohmmeter across LED in one direction, then reverse the

leads for the opposite direction. The LED should have at

least 100 times more resistance in reverse direction, as

compared with the forward direction. If high resistance in

both directions, LED is open. If low in both directions, LED

is shorted.

Method 3

To test LEDs with ZSM connected to unit, test voltages at

LED terminals on ZSM. A measurement of 32 Vdc, across

an unlit LED, means the LED has failed.

Note: Measurements should be made from LED common

(ZSM terminal 6 to respective LED terminal). Refer

to Table 20, p. 47.

Programmable & Digital Zone

Sensor Test

Testing Serial Communication Voltage

1. Verify 24 Vac is present between terminals J6-14 and

J6-11.

2. Disconnect wires from J6-11 and J6-12. Measure the

voltage between J6-11 and J6-12, should be about

32 Vdc.

3. Reconnect wires to terminals J6-11 and J6-12. Measure

voltage again between J6-11 and J6-12, voltage should

flash high and low every 0.5 seconds. The voltage on

the low end will measure about 19 Vdc, while the

voltage on the high end will measure from

approximately 24 to 38 Vdc.

4. Verify all modes of operation, by running the unit

through all of the steps in the “Test Modes” section

discussed in “Start Up,” p. 37”.

5. After verifying proper unit operation, exit the test

mode. Turn the fan on continuously at the ZSM, by

pressing the button with the fan symbol. If the fan

comes on and runs continuously, the ZSM is good. If

you are not able to turn the fan on, the ZSM is

defective.

ReliaTel Refrigeration Module (RTRM)

Default Chart

If the RTCI loses input from the building management

system, the RTRM will control in the default mode after

approximately 15 minutes. If the RTRM loses the Heating

and Cooling setpoint input, the RTRM will control in the

default mode instantaneously.

The temperature sensing thermistor in the Zone Sensor

Module is the only component required for the “Default

Mode” to operate.

Unit Operation Without a Zone Sensor

This procedure is for temporary operation only. The

economizer and condenser fan cycling functions are

disabled.

Table 20. Default operation for mechanical ZSM (CV

only)

J6 Input/Connection If no input/connection this

happens

J6-7(a) - Heat indication

(a)these connections are only on certain model ZSMs

LED will not come on while heating

LED will not flash during heat fail

J6-8(a) - Cool indication LED will not come on while cooling

LED will not flash during cool fail(a)

J6-9(a) - System indication

(sys on) LED will not come on while unit has power

J6-10(a) - Service

indication LED will not come on when CFS or FFS

trips

Table 21. System mode and fan selection

Resistance

Valves

(K-Ohms)

Zone Sensor

Unit/Fan

Mode Local Unit

Mode Local Fan

Mode

2.32 Off/Auto Off Auto

4.87 Cool/Auto Cool Auto

7.68 Auto/Auto Auto Auto

10.77 Off/On Off On

13.32 Cool/On Cool On

16.13 Auto/On Auto On

19.48 Heat/Auto Heat Auto

27.93 Heat/On Heat On

35.0 Emergency

Heat/Auto Emergency

Heat Auto

43.45 Emergency

Heat/On Emergency

Heat On

Out of Range

(Short) INVALID/Short Invalid (CV),

Auto (VAV) Invalid

Out of Range

(Open) INVALID/Open Invalid (CV), Off

(VAV) Invalid

Table 21. System mode and fan selection

Troubleshooting

48 RT-SVX26L-EN

1. Open and Lock the unit disconnect switch.

2. Remove the Outside Air Sensor (OAS) from the

condenser section of unit.

3. Use two (2) wire nuts, to individually cap the wires.

4. Locate the RTRM (J6). Connect two (2) wires to

terminals J6-1 and 2.

5. Connect the sensor (OAS) using two wire nuts to the

two (2) field supplied wires that were connected to

terminals 1 and 2 on J6.

Unit Economizer Control (ECA)

Troubleshooting ReliaTel Control

Verify Economizer Status by Economizer Actuator (ECA)

LED indicator:

• OFF: No Power or Failure

• ON: Normal, OK to Economize

• Slow Flash: Normal, Not OK to Economize

• Fast Flash - 1/4 Second On / 2 Seconds Off:

– Error Code: Communications Failure

• Pulse Flash: 1/30 Second On / 1/4 Second Off: (2

Seconds between pulse sequences)

Error Code:

• 1 Flash: Actuator Fault

• 2 Flashes: CO2 Sensor

• 3 Flashes: RA Humidity Sensor

• 4 Flashes: RA Temp Sensor

• 5 Flashes: OA Quality Sensor

• 6 Flashes: OA Humidity Sensor

• 7 Flashes: OA Temp Sensor

• 8 Flashes: MA Temp Sensor

• 9 Flashes: RAM Fault

• 10 Flashes: ROM Fault

• 11 Flashes: EEPROM Fault

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote

disconnects before servicing. Follow proper lockout/

tagout procedures to ensure the power can not be

inadvertently energized. Failure to disconnect power

before servicing could result in death or serious injury.

RT-SVX26L-EN 49

Wiring Diagrams

Note: Wiring diagrams can be accessed via e-Library by

entering the diagram number in the literature order

number search field or by contacting technical

support.

Table 22. Wiring diagrams

Type of

Airflow Schematic

Type Voltage Diagram

Number Description

Constant

Volume

Power 200-575

2313-1480 YS*150-300 50/60HZ, 2 Stage Gas Heat

1213-1002 YH*150-300 50/60HZ, 2 Stage Gas Heat

2313-1481 YS*150-300 50/60HZ, Modulating Gas Heat,

1213-1003 YH*150-300 50/60HZ, Modulating Gas Heat

Control 200-575

2313-1489 YS*150-300 2 Stage Gas Heat, with or without Dehumidification

1213-1010 YH*150-300 2 Stage Gas Heat, with or without Dehumidification

2313-1490 YS*150-300 with or without Dehumidification

1213-1010 YH*150-300 Modulating Gas Heat, with or without Dehumidification

2313-1495 YS*150-300 with or without Dehumidification, Option Modules

1213-1015 YH*150-300 with or without Dehumidification, Option Modules

Raceway

Connection 200-575

2313-1516 YS*150-300 2 Stage Gas Heat, with or without Dehumidification

1213-1039 YH*150-300 2 Stage Gas Heat, with or without Dehumidification

2313-1517 YS*150-300 Modulating Gas Heat, with or without Dehumidification

1213-1040 YH*150-300 Modulating Gas Heat, with or without Dehumidification

Control Box

Connections

200-230 2313-1501 YS*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

2313-1503 YS*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

380-575 2313-1502 YS*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

2313-1504 YS*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

200-575

1213-1019 YH*150-240 2 Stage Gas Heat, with or without Dehumidification

1213-1020 YH*150-240 Modulating Gas Heat, with or without Dehumidification

1213-1048 YH*300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

1213-1049 YH*300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

Module

Connections 200-575 1213-1029 YH*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

1213-1030 YH*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

Variable Air

Volume/

Multi-speed

Fans/Single

Zone Variable

Air Volume

Power 208-575

2313-1484 YS*150-300 50/60HZ, 2 Stage Gas Heat

1213-1002 YH*150-300, 50/60HZ, 2 Stage Gas Heat

2313-1485 YS*150-300 50/60HZ, Modulating Gas Heat

1213-1003 YH*150-300, 50/60HZ, Modulating Gas Heat

Control 208-575

2313-1493 YS*150-300, YH*150-300, 2 Stage Gas Heat, with or without Dehumidification

1213-1010 YH*150-300, 2 Stage Gas Heat, with or without Dehumidification

2313-1494 YS*150-300 Modulating Gas Heat, with or without Dehumidification

1213-1010 YH*150-300, Modulating Gas Heat, with or without Dehumidification

2313-1495 YS*150-300 with or without Dehumidification, Option Modules

1213-1015 YH*150-300, with or without Dehumidification, Option Modules

Raceway

Connection 208-575

2313-1520 YS*150-300 2 Stage Gas Heat, with or without Dehumidification

1213-1039 YH*150-300, 2 Stage Gas Heat, with or without Dehumidification

2313-1521 YS*150-300 Modulating Gas Heat, with or without Dehumidification

1213-1040 YH*150-300, Modulating Gas Heat, with or without Dehumidification

Wiring Diagrams

50 RT-SVX26L-EN

Variable Air

Volume/

Multi-speed

Fans/Single

Zone Variable

Air Volume

Control Box

Connections

208-230 2313-1511 YS*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

2313-1509 YS*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

460-575 2313-1510 YS*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

2313-1512 YS*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

200-575

1213-1252 YH*150-240 2 Stage Gas Heat, with or without Dehumidification

1213-1253 YH*150-240 Modulating Gas Heat, with or without Dehumidification

1213-1255 YH*300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

1213-1256 YH*300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

Module

Connections 200-575 1213-1029 YH*150-300 50/60HZ, 2 Stage Gas Heat, with or without Dehumidification

1213-1030 YH*150-300 50/60HZ, Modulating Gas Heat, with or without Dehumidification

Table 22. Wiring diagrams

Type of

Airflow Schematic

Type Voltage Diagram

Number Description

Table 23. Wiring diagrams for units with High Short Circuit Rating (SCCR)

Type of

Airflow Schematic

Type Voltage Diagram

Number Description

Constant

Volume

Power 208-575

2313-1579 YS*180-300 2-Stage Gas Heat

1213-1005 YH*150-300 2-Stage Gas Heat

2313-1580 YS*180-300 Modulating Gas Heat

1213-1006 YH*150-300 Modulating Gas Heat

Control 208-575

2313-1584 YS*180-300 2-Stage Gas Heat

1213-1014 YH*150-300 2-Stage Gas Heat

2313-1585 YS*180-300 Modulating Gas Heat

1213-1014 YH*150-300 Modulating Gas Heat

2313-1590 YS*180-300 2-Stage Gas Heat & Modulating Gas Heat Options Modules

1213-1015 YH*150-300 2-Stage Gas Heat & Modulating Gas Heat Options Modules

Raceway

Connection 208-575

2313-2021 YS*180-300 2-Stage Gas Heat

1213-1044 YH*150-300 2-Stage Gas Heat

2313-2022 YS*180-300 Modulating Gas Heat

1213-1045 YH*150-300 Modulating Gas Heat

Control Box

Connections 208-575

2313-2004 YS*180-300 2-Stage Gas Heat

1213-1024 YH*150-240 2-Stage Gas Heat

2313-2005 YS*180-300 Modulating Gas Heat

1213-1025 YH*150-240 Modulating Gas Heat

1213-1262 YH*300 2-Stage Gas Heat

Module

Connections 208-575

2313-2050 YS*180-300 2-Stage Gas Heat

1213-1034 YH*150-300 2-Stage Gas Heat

2313-2051 YS*180-300 Modulating Gas Heat

1213-1035 YH*150-300 Modulating Gas Heat

Multi-zone

Variable Air

Volume/

Multi-speed

Fans/Single

Zone Variable

Air Volume

Power 208-575

2313-1579 YS*180-300 2-Stage Gas Heat

1213-1005 YH*150-300 2-Stage Gas Heat

2313-1580 YS*180-300 Modulating Gas Heat

1213-1006 YH*150-300 Modulating Gas Heat

Wiring Diagrams

RT-SVX26L-EN 51

Multi-zone

Variable Air

Volume/

Multi-speed

Fans/Single

Zone Variable

Air Volume

Control 208-575

2313-1588 YS*180-300 2-Stage Gas Heat

1213-1014 YH*150-300 2-Stage Gas Heat

2313-1589 YS*180-300 Modulating Gas Heat

1213-1014 YH*150-300 Modulating Gas Heat

2313-1590 YS*180-300 2-Stage Gas Heat & Modulating Gas Heat Options Modules

1213-1015 YH*150-300 2-Stage Gas Heat & Modulating Gas Heat Options Modules

Raceway

Connection 208-575

2313-2025 YS*180-300 2-Stage Gas Heat

1213-1044 YH*150-300 2-Stage Gas Heat

2313-2026 YS*180-300 Modulating Gas Heat

1213-1045 YH*150-300 Modulating Gas Heat

Control Box

Connections 208-575

2313-2008 YS*180-300 2-Stage Gas Heat

1213-1024 YH*150-240 2-Stage Gas Heat

2313-2009 YS*180-300 Modulating Gas Heat

1213-1025 YH*150-240 Modulating Gas Heat

1213-1262 YH*300 2-Stage Gas Heat

1213-1263 YH*300 Modulating Gas Heat

Module

Connections 208-575

2313-2054 YS*180-300 2-Stage Gas Heat

1213-1034 YH*150-300 2-Stage Gas Heat

2313-2055 YS*180-300 Modulating Gas Heat

1213-1035 YH*150-300, Modulating Gas Heat

Table 23. Wiring diagrams for units with High Short Circuit Rating (SCCR)

Type of

Airflow Schematic

Type Voltage Diagram

Number Description

52 RT-SVX26L-EN

Warranty

YHC, YSC, YHD, and YHD (Parts Only)

Models Less than 20 Tons for Commercial

Use*

This warranty is extended by Trane, to the original

purchaser and to any succeeding owner of the real

property to which the Air Conditioner is originally affixed,

and applies to products purchased and retained for use

within the U.S.A. and Canada. There is no warranty against

corrosion, erosion or deterioration.

If any part of your air conditioner fails because of a

manufacturing defect within one year from the date of the

original purchase, Warrantor will furnish without charge

the required replacement part.

If the heat exchanger fails because of a manufacturing

defect within five years from the date of start-up,

Warrantor will furnish without charge a replacement heat

exchanger.

In addition, if the optional, factory installed, stainless steel

heat exchanger fails because of a manufacturing defect

within ten years from the date of start-up, Warrantor will

furnish without charge a replacement heat exchanger. Any

local transportation, related service labor and diagnosis

calls are not included.

In addition, if the sealed motor-compressor fails because

of a manufacturing defect within the second through fifth

year from the date of original purchase, Warrantor will

furnish without charge the required replacement

compressor.

Warrantor’s obligations and liabilities under this warranty

are limited to furnishing F.O.B. Warrantor factory or

warehouse replacement parts for Warrantor’s products

covered under this warranty.

Warrantor shall not be obligated to pay for the cost of lost

refrigerant.

No liability shall attach to Warrantor until products have

been paid for and then liability shall be limited solely to the

purchase price of the equipment under warranty shown to

be defective.

THE WARRANTY AND LIABILITY SET FORTH HEREIN ARE

IN LIEU OF ALL OTHER WARRANTIES AND LIABILITIES,

WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS

OR IMPLIED, IN LAW OR IN FACT, INCLUDING BUT NOT

SPECIFICALLY LIMITED TO IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR PARTICULAR

USE, AND IN NO EVENT SHALL WARRANTOR BE LIABLE

FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long an

implied warranty lasts or do not allow the exclusion or

limitation of incidental or consequential damages, so the

above limitation or exclusion may not apply to you. This

warranty gives you specific legal rights, and you may also

have other rights which vary from state to state.

Trane

2701 Wilma Rudolph Blvd.

Clarksville, TN 37040-1008

Attention: Manager, Product Service

GW-602-4800

Models 20 Tons and Greater for Commercial

Use*

The Company warrants for a period of 12 months from

initial start-up or 18 months from date of shipment,

whichever is less, that the Company products covered by

this order (1) are free from defects in material and

workmanship and (2) have the capacities and ratings set

forth in the Company’s catalogs and bulletins, provided

that no warranty is made against corrosion, erosion or

deterioration.

In addition, if the sealed motor-compressor fails because

of a manufacturing defect within the second through fifth

year from the date of original purchase, Warrantor will

furnish without charge the required replacement

compressor.

Finally, if the optional, factory installed, stainless steel heat

exchanger fails because of a manufacturing defect within

ten years from the date of start-up, Warrantor will furnish

without charge a replacement heat exchanger. Any local

transportation, related service labor and diagnosis calls

are not included.

The Company’s obligations and liabilities under this

warranty are limited to furnishing f.o.b. factory or

warehouse at Company designated shipping point, freight

allowed to Buyer’s city (or port of export for shipment

outside the conterminous United States) replacement

equipment (or at the option of the Company parts

therefore) for all Company products not conforming to this

warranty and which have been returned to the

manufacturer.

The Company shall not be obligated to pay for the cost of

lost refrigerant.

No liability whatsoever shall attach to the Company until

said products have been paid for and then said liability

shall be limited to the purchase price of the equipment

shown to be defective.

The Company makes certain further warranty protection

available on an optional extra-cost basis. Any further

warranty must be in writing, signed by an officer of the

Company.

The warranty and liability set forth herein are in lieu of all

other warranties and liabilities, whether in contract or in

negligence, express or implied, in law or in fact, including

implied warranties of merchantability and fitness for

particular use.

In no event shall the Company be liable for any incidental

or consequential damages.

Warranty

RT-SVX26L-EN 53

Tra n e

2701 Wilma Rudolph Blvd.

Clarksville, TN 37040-1008

Attention: Manager, Product Service

* This warranty is for commercial usage of said equipment

and not applicable when the equipment is used for a

residential application. Commercial use is any application

where the end purchaser uses the product for other than

personal, family or household purposes.

*A 5 year limited warranty is provided for the optional Low

Leak Economizer, when combined with the optional FDD

(Fault Detection & Diagnostics) option.

The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll

Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments,the manufacturer

offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For

more information, visit www.IRCO.com.

The manufacturer has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

We are committed to using environmentally

conscious print practices that reduce waste.

© 2015 Trane All rights reserved

RT-SVX26L-EN 21 Jan 2015

Supersedes RT-SVX26K-EN (27 May 2014)