Trane Voyager 12 5 To 25 Tons Installation And Maintenance Manual Installation, Operation,

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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™ – Heat Pump

12½ – 20 Ton, 60/50 Hz

Installation, Operation,

and Maintenance

Model Numbers

WS*150-240

RT-SVX33E-EN

May 2014

© 2014 Trane All rights reserved RT-SVX33E-EN

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings,

cautions and notices appear at appropriate intervals

throughout this manual. Warnings are provide to alert

installing contractors to potential hazards that could result

in personal injury or death. Cautions are designed to alert

personnel to hazardous situations that could result in

personal injury, while notices indicate a situation that may

result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this

machine depend upon the strict observance of these

precautions.

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.

ATTENTION: Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. Read

these carefully:

WARNING Indicates a potentially hazardous

situation which, if not avoided, could

result in death or serious injury.

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.

Warnings, Cautions and Notices

RT-SVX33E-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-SVX33E-EN (27 May 2014)

• New Low Leak Economizer & Fault Detection

Diagnostics (FDD) Options

• Updated Model Number Description Section

• Added back Warranty Section

4 RT-SVX33E-EN

Table of Contents

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

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

Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . 7

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . 7

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

ReliaTel™ Control . . . . . . . . . . . . . . . . . . . . . 8

System Input Devices & Functions . . . . . . . 8

Zone Sensors . . . . . . . . . . . . . . . . . . . . . . . . 10

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 11

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

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Factory-Mounted Unit Options . . . . . . . . . . . 26

Circuit Breaker (FIYUCB) & Unit Disconnect

(FIYUDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Powered/Unpowered Convenience Outlet 27

Return Air Smoke Detector . . . . . . . . . . . . . 28

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 38

ReliaTel Controls . . . . . . . . . . . . . . . . . . . . . 38

System Status Checkout Procedure . . . . . 38

Resetting Cooling and Heating Lockouts . 39

Zone Temperature Sensor (ZTS) Service Indi-

cator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Clogged Filter Switch . . . . . . . . . . . . . . . . . 40

Fan Failure Switch . . . . . . . . . . . . . . . . . . . . 40

Condensate Overflow Switch . . . . . . . . . . . 40

Zone Temperature Sensor (ZTS) Tests . . 40

Programmable & Digital Zone Sensor Test 41

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . 43

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

RT-SVX33E-EN 5

Digit 1 — Unit Type

W = Packaged Cooling, Electric Heat

Digit 2 — Efficiency

S = Standard 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

200= 20 Ton, 50Hz

240 = 20 Tons, 60Hz

Digit 7 — Major Design

Sequence

E = R-410A Refrigerant

Digit 8 — Voltage Selection

3 = 208-230/60/3

4 = 460/60/3

W = 575/60/3

T = 200/50/1

D = 380-415/50/3

Digit 9 — Unit Controls

R = Reliatel

Digit 10 — Heating Capacity

Note: (Applicable to Digit 1 W models

only)

0 = No Heat

G = 18 kW Electric Heat

N = 36 kW Electric Heat

P = 54 kW Electric Heat

R = 72 kW Electric Heat

Digit 11 — Minor Design

Sequence

Digit 12, 13 — Service Sequence

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

WSD 150 E 3 R G B **

123 456 7 8 9 10 11 1213

Digit 15 — Supply Fan/Drive

Type/Motor

0=Standard Motor

1 = Oversized Motor2

3 = High Efficiency Motor2

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 Ground

Ring

B = Multi-Speed Standard Motor w/

Shaft Ground Ring

C = Single Zone Variable Air Volume

Oversized Motor w/ Shaft Ground

Ring

D = Multi-Speed Oversized Motor w/

Shaft Ground Ring

Digit 16 — Hinged Service

Access / Filters

0 = Standard Panels/Standard

Filters13

A = Hinged Access/Standard Filters13

B = Standard Panels / 2" MERV 8

Filters2

C = Hinged Access / 2" MERV 8

Filters2

D = Standard Panels / MERV 13

Filters2

E = Hinged Access / MERV 13 Filters2

Digit 17 — Condenser Coil

Protection

0 = Standard Coil

1 = Standard Coil With Hail Guard

2 = Black Epoxy Pre-Coated Coil

3 = Black Epoxy Pre-Coated Coil with

Hail Guard

Digit 18 — Through The Base

Provisions

0 = No Through The Base Provisions

A = Through The Base Electric3

D = Through The Base Utilities Access

Digit 19 — Disconnect Switch/

Circuit Breaker4

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

Interface

2 = Lontalk Communications

Interface

6 = Building Automation Control

Network Communications

Interface

Digit 22 — Refrigeration System

Option

0 = Standard refrigeration system

Digit 23 — Refrigeration

Controls

0 = Without Refrigeration Controls

1=Frostat

6

Digit 24 — Smoke Detector7, 8

0 = Without Smoke Detector

A = Return Air Smoke Detector

B = Supply Air Smoke Detector

C = Return/Supply Air Smoke

Detector

D = Plenum Smoke Detector9

Digit 25 — System Monitoring

Controls6

0 = No Monitoring Controls

1 = Clogged Filter Switch

2 = Fan Failure Switch

3 = Discharge Air Sensing

4 = Clogged Filter Switch and Fan

Failure

5 = Clogged Switch and Discharge Air

Sensing

6 = Fan Failure Switch and Discharge

Air Sensing

7 = Clogged Filter Switch, Fan Failure

Switch and Discharge Air Sensing

A = Condensate Drain Pan Overflow

Switch

B = Clogged Filter Switch and

Condensate Drain Pan Overflow

Switch

C = Fan Failure Switch and

Condensate Drain Pan Overflow

Switch

D = Discharge Air Sensing and

Condensate Drain Pan Overflow

Switch

E = Clogged Filter Switch, Fan Failure

Switch and Condensate Drain Pan

Overflow Switch

F = Clogged Filter Switch, Discharge

Air Sensing Tube and Condensate

Drain Pan Overflow Switch

G = Fan Failure Switch, Discharge Air

Sensing Tube and Condensate

Drain Pan Overflow Switch

Model Number Description

6 RT-SVX33E-EN

Model Number Description

H = Clogged Filter Switch, Fan Failure

Switch, Discharge Air Sensing

and Condensate Drain Pan

Overflow Switch

Digit 26 - System Monitoring

Controls

0 = No Monitoring Controls

A = Demand Control Ventilation

(CO2)10

B = FDD (Fault Detection and

Diagnostics)

C = FDD (Fault Detection Diagnostics)

& Demand Control Ventilation

(CO2)10

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 Option11, 12

Digit 31 - Advanced Unit

Controls

0 = Standard Unit Controls

1=Human Interface

14

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. Available factory installed on

downflow AND horizontal units.

Verify with ordering system.

3. Through-the-base electrical

option or Horizontal-Side Access

must be ordered with either unit

mounted disconnect or circuit

breaker.

4. Unit mounted disconnect and

circuit breakers are mutually

exclusive of each other.

5. Must be ordered with Through-

the-Base Electrical option or

Horizontal-Side Access and either

Unit Mounted Disconnect or

Circuit Breaker.

6. 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.

7. Requires ReliaTel Options Module.

8. 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.

9. Supply and/or return smoke

detector may not be used with the

plenum smoke detector.

10. Demand Control Ventilation

Option includes wiring only. The

C02 sensor is a field-installed only

option.

11. Only available where MOP is

above 60A.

12. 575 VAC option is 25kA.

13. Standard filters are not available

with Low Leak Economizers.

14. Human Interface is standard with

FDD (Fault Detection Diagnostics).

RT-SVX33E-EN 7

General Information

Unit Inspection

As soon as the unit arrives at the job site:

• Verify that the nameplate data matches the data on the

sales order and bill of lading (including electrical data).

• Verify that the power supply complies with the unit

nameplate specifications.

• Visually inspect the exterior of the unit, including the

roof, for signs of shipping damage.

• 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:

15. The unit is stored before it is installed; or,

16. 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. 33.

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. 11 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.

Unit Description

Before shipment, each unit is leak tested, dehydrated,

charged with refrigerant and compressor oil, and run

tested for proper control operation.

The condenser coils are aluminum fin, mechanically

bonded to copper tubing.

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

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, mask, 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.

General Information

8 RT-SVX33E-EN

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.

ReliaTel™ Control

Economizer Control Actuator

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% of stroke. The actuator is spring returned to the

closed position any time that power is lost to the unit. It is

capable of delivering up to 25 inch pounds of torque and

is powered by 24 Vac.

RTCI – ReliaTel™ Trane Communication

Interface (Optional)

This module is used when the application calls for an 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.

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.

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 schematics for the specific

module connections.

The following Controls are Available from the

Factory for Field Installation:

Supply Fan Failure Input (Optional)

The Fan Failure Switch can be connected to sense indoor

fan operation:

FFS (Fan Failure Switch) If air flow through the unit is not

proven by the differential pressure switch connected to the

RTOM (factory set point 0.07 “ w.c.) within 40 seconds

nominally, the RTRM will shut off all mechanical

operations, lock the system out, send a diagnostic to ICS,

and the SERVICE output will flash. The system will remain

locked out until a reset is initiated either manually or

through ICS.

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.

General Information

RT-SVX33E-EN 9

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.

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.

High Pressure Control (Optional)

ReliaTel Control

The high pressure controls are wired in series between the

compressor outputs on the RTRM and the compressor

contactor coils. If the high pressure control switch opens,

the RTRM senses a lack of current while calling for cooling

and locks the compressor out.

On dual circuit units, if the high pressure control opens,

the compressor on the affected circuit is locked out. A

manual reset for the affected circuit is required.

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%.

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.

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.

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.

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.

Important: 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

General Information

10 RT-SVX33E-EN

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.

Zone 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)

(BAYSENS107*)

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 (BAYSENS109*)

This electronic sensor features four system switch settings

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

Auto) with four system status LED’s. It is a manual or auto

changeover control with dual setpoint capability. It can be

used with a remote zone temperature sensor

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, 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 BAYSENS106*,

108*, 110*, 109* Remote Panels. When this sensor is wired

to a BAYSENS109* 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.

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.

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.

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

RT-SVX33E-EN 11

Unit Dimensions

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

WITHOUT ECONOMIZER

5' 8" WITH ECONOMIZER

5' 0"

Unit Dimensions

12 RT-SVX33E-EN

Figure 2. Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

DOWNFLOW CONDENSATE

DRAIN CONN 1" (25.4MM) NPT

121 11/16"

6 7/16"

84 3/16"

33 3/16"

8 15/16"

1"

2 11/16"

56"

48 1/2"

6 13/16"

122 5/16"

85 5/16"

54"

13/16"

SINGLE POINT

POWER ENTRY

3" (76MM) DIA HOLE

(UNIT POWER WIRE)

7/8" (22.23MM) DIA. HOLE

(UNIT CONTROL

WIRE)

FILTER

ACCESS DOOR

HORIZONTAL

SERVICE GAUGE

PORT ACCESS

2167MM

3107MM

20MM

1372MM

2154MM

25.4MM

1231.90MM

173MM

3091MM

1422MM

163.51MM

843MM

227MM

68.26MM

Figure 3. Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

Unit Dimensions

RT-SVX33E-EN 13

Figure 4. Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

Figure 5. Heat pump models - 12½ - 15 tons

* Duct flanges mount 7-7/16" down inside the curb on the 1-1½ curb flanges.

Roofcurb is intended for downflow use only.

* All dimensions are in inches/millimeters.

9

1”

25.4 MM

CURB FLANGE

LONG SIDES

SHORT SIDES

Figure 6. Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

Unit Dimensions

14 RT-SVX33E-EN

Figure 7. Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

DOWNFLOW CONDENSATE

DRAIN CONN 1" (25.4MM) NPT

121 11/16"

6 7/16"

84 3/16"

33 3/16"

8 15/16"

1"

2 11/16"

56"

48 1/2"

6 13/16"

122 5/16"

85 5/16"

64 1/8"

13/16"

SINGLE POINT

POWER ENTRY

3" (76MM) DIA HOLE

(UNIT POWER WIRE)

7/8" (22.23MM) DIA. HOLE

(UNIT CONTROL

WIRE)

FILTER

ACCESS DOOR

HORIZONTAL

SERVICE GAUGE

PORT ACCESS

2167MM

3107MM

20MM

1629MM

2154MM

25.4MM

1231.90MM

173MM

3091MM

1422MM

163.51MM

843MM

227MM

68.26MM

Figure 8. Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

Unit Dimensions

RT-SVX33E-EN 15

Figure 9. Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

Figure 10. Heat pump models - 20 tons

* Duct flanges mount 7-7/16" down inside the curb on the 1-1½ curb flanges.

Roofcurb is intended for downflow use only.

* All dimensions are in inches/millimeters.

9

1”

25.4 MM

CURB FLANGE

LONG SIDES

SHORT SIDES

Figure 11. Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

Unit Dimensions

16 RT-SVX33E-EN

Figure 12. Downflow & horizontal condensate locations

Table 1. Unit dimensions

Tons Condensate

Drain Size

Condensate Drain Location

Downflow Only Downflow Horizontal

ABCDFGH EJEK

12½, 15, 20 26 7/16 28 3/4 19 15/16 4 1/4 4 1/4 76 5/16 68 11/16 1 NPT - 26 3/4 - 5 3/8

Figure 13. Through the base utility locations and access panel swing clearances

SWING RADIUS (C)

OD SECTION

ACCESS PANEL

THROUGH THE

BASE ELECTRICAL

SWING RADIUS (A)

ID SECTION

ACCESS PANEL

TOP VIEW SHOWING THROUGH THE BASE

ELECTRICAL UTILITY LOCATIONS AND ACCESS PANEL SWING CLEARANCES.

SWING RADIUS (E)

HORIZONTAL FILTER

ACCESS PANEL

SWING RADIUS (D)

ID FAN SECTION

ACCESS PANEL

B

6 7/8"

Table 2. Swing clearances

Unit Model # A B C D E

WSD150-180 42 3/8 48 3/8 31 N/A N/A

WSD240 29 1/2 56 38 1/2 18 1/2 N/A

WSH150-180 42 3/8 N/A 31 N/A 12

WSH240 29 1/2 N/A 38 1/2 18 1/2 14

Note: All dimensions are in inches.

RT-SVX33E-EN 17

Unit Weights

Rigging

Refer to Figure 14 and Table 3 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 14. 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 14, 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.

Table 3. Typical unit weights and point loading data

Corner Weights

(lbs.) Center of

Gravity (in.)

Unit

Description Net

Weight A B C D Length Width

WS*150 1978 633 514 376 455 56 36

WS*155 1982 634 515 377 456 56 36

WS*180 1982 634 515 377 456 56 36

WS*200 2107 674 485 400 590 57 35

WS*240 2107 674 485 400 590 57 35

Note: Corner weights are given for information only. Unit is to be supported

continuously by a curb or equivalent frame support.

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 14. Rigging and center of gravity data

18 RT-SVX33E-EN

Installation

Foundation

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 3, 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, ensure the roof is strong enough

to support the combined unit and support structural

weight.

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:

1. 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.

2. 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.

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.

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

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 Tab le 3,

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.

Installation

RT-SVX33E-EN 19

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.

Condensate Drain Configuration

An evaporator condensate drain connection is provided

on each unit. Refer to “Unit Dimensions,” p. 11 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 15,

p. 19.

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

Pitch the drain lines at least 1/2 inch for every 10 feet of

horizontal run to assure proper condensate flow. Do not

allow the horizontal run to sag causing a possible 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, filters are removed by pulling the filter removal

tool.

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

filter requirements.

Note: Do not operate the unit without filters.

Electrical Requirements

Main Electrical Power Requirements

• Verify that the power supply complies with the unit

nameplate specifications.

• Inspect all control panel components; tighten any

loose connections.

• Connect properly sized and protected power supply

wiring to a field-supplied/installed disconnect switch

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

control panel.

• Install proper grounding wires to an earth ground.

Note: All field-installed wiring must comply with NEC

and applicable local codes.

Low Voltage Wiring (AC & 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.

Field Installed Power Wiring

An overall dimensional layout for the standard field

installed wiring entrance into the unit is illustrated in the

Unit Dimensions section. 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% of the rated voltage stamped on the

nameplate. Use only copper conductors to connect the

power supply to the unit.

Figure 15. Condensate trap installation

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.

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

20 RT-SVX33E-EN

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).

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.

1. 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).

2. Location of the applicable electrical service entrance is

illustrated in the Unit Dimensions section. 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.

3. Provide proper grounding for the unit in accordance

with local and national codes.

Optional TBUE Wiring (Through the Base

Electrical Option)

1. Location of the applicable electrical service is

illustrated in the following illustration. 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).

2. 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. 22.

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.

Controls Using 24 VAC

Before installing any connecting wiring, refer to “Unit

Dimensions,” p. 11 for the electrical access locations

provided on the unit and Table 4, p. 21 for AC conductor

sizing guidelines, and;

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 16. Through the base electrical option

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

RT-SVX33E-EN 21

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.

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 Figure 17,

p. 21.

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. 11 for the electrical access

locations provided on the unit.

1. Table 5, p. 21 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:

Component Failure!

Resistance in excess of 3 ohms per conductor could

result in component failure due to insufficient AC

voltage supply.

Table 4. Electromechanical thermostat 24 Vac

conductors with ReliaTel™

Distance from Unit to

Control Recommended Wire Size

000 - 460 feet (000 - 140 m) 18 gauge (0.75 mm2)

461 - 732 feet (141 - 223 m) 16 gauge (1.3 mm2)

733 - 1000 feet (224 - 305 m) 14 gauge (2.0 mm2)

Table 5. DC conductors 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 17. Reliatel conventional thermostat field wiring

diagram

RTRM

Installation

22 RT-SVX33E-EN

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

BAYSENS119*

BAYSENS075*

BAYSENS075*

BAYSENS075*

BAYSENS107*

ASYSTAT666*

ASYSTAT669*

BAYSTAT023*

BAYSENS073*

BAYSENS109*

ASYSTAT669*

ASYSTAT669*

BAYSENS109*

BAYSENS074*

BAYSENS077*

ASYSTAT669*

Installation

RT-SVX33E-EN 23

Space Temperature Averaging

Space temperature averaging is accomplished by wiring a

number of remote sensors in a series/parallel circuit.

Using the BAYSENS016* or BAYSENS075*, 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 is required. Example #2

illustrates three sensors squared in a series/parallel circuit.

Using BAYSENS075*, two sensors are required to

accomplish space temperature averaging. Example #3

illustrates the circuit required for this senor. Table 6, p. 24

lists the temperature versus resistance coefficient for all

sensing.

Figure 19. Space temperature averaging examples

Installation

24 RT-SVX33E-EN

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.

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%. Measure

and record the voltage between phases 1, 2, and 3 and

calculate the amount of imbalance as follows:

% Voltage Imbalance =

where Average Voltage (AV);

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% imbalance in this example exceeds the

maximum allowable imbalance of 2.0%. This much

imbalance between phases can equal as much as a 20%

current imbalance with a resulting increase in motor

winding temperatures that will decrease motor life. If the

voltage imbalance is over 2%, notify the proper agencies

to correct the voltage problem before operating this

equipment.

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.

Table 6. Temperature vs. resistance

Temperature

Nominal ResistanceDegrees F° Degrees C°

-20° -28.9° 170.1 K - Ohms

-15° -26.1° 143.5 K - Ohms

-10° -23.3° 121.4 K - Ohms

-5° -20.6° 103.0 K - Ohms

0° -17.8° 87.56 K - Ohms

5° -15.0° 74.65 K - Ohms

10° -12.2° 63.80 K - Ohms

15° -9.4° 54.66 K - Ohms

20° -6.7° 46.94 K - Ohms

25° -3.8° 40.40 K - Ohms

30° -1.1° 34.85 K - Ohms

35° 1.7° 30.18 K - Ohms

40° 4.4° 26.22 K - Ohms

45° 7.2° 22.85 K - Ohms

50° 10.0° 19.96 K - Ohms

55° 12.8° 17.47 K - Ohms

60° 15.6° 15.33 K - Ohms

65° 18.3° 13.49 K - Ohms

70° 21.1° 11.89 K - Ohms

75° 23.9° 10.50 K - Ohms

80° 26.7° 9.297 K - Ohms

85° 29.4° 8.247 K - Ohms

90° 32.2° 7.330 K - Ohms

95° 35.0° 6.528 K - Ohms

100° 37.8° 5.824 K - Ohms

100 AV VD–

AV

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





AV Volt1 Volt2 Volt3++

3

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





=

221 230 227++

3

-----------------------------------------------2.2percent=

100 226 221–

226

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





2.2percent=

Installation

RT-SVX33E-EN 25

Compressor Crankcase Heaters

Each compressor is equipped with a crankcase heater. The

proper operation of the crankcase heater is important to

maintain an elevated compressor oil temperature during

the “Off” cycle to reduce oil foaming during compressor

starts. Oil foaming occurs when refrigerant condenses in

the compressor and mixes with the oil. In lower ambient

conditions, refrigerant migration to the compressor could

increase.

When the compressor starts, the sudden reduction in

crankcase pressure causes the liquid refrigerant to boil

rapidly causing the oil to foam. This condition could

damage compressor bearings due to reduced lubrication

and could cause compressor mechanical failures.

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

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

power disconnect to the “On” position and allow the

crankcase heater to operate a minimum of 8 hours.

Before closing the main power disconnect switch, insure

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

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

Close the main power disconnect switch and the unit

mounted disconnect switch, if applicable.

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.

Final Steps

Use the checklist provided below in conjunction with the

checklist in “General Unit Requirements,” p. 18, 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 is 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.

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.

26 RT-SVX33E-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 20,

p. 26).

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 20). Route wires

through loose wire ties provided in unit as in Figure 20.

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 20. Main power entrance for units with factory

mounted disconnect or circuit breaker

Wire Ties

Factory-Mounted Unit Options

RT-SVX33E-EN 27

Powered/Unpowered

Convenience Outlet

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 21. Wiring schematic 12½ through 25 ton options

Factory-Mounted Unit Options

28 RT-SVX33E-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 22. 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 23. Brackets

Factory-Mounted Unit Options

RT-SVX33E-EN 29

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 25, p. 30 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. 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 detector

from performing its design function.

Figure 24. 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

30 RT-SVX33E-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.

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.

Figure 25. Smoke detector wiring scheme

RT-SVX33E-EN 31

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 Table 7, p. 31.

Table 7. Service test guide for component operation

TEST STEP MODE Fan Econ2. Comp 1 Comp 2 Heat 1 Heat 2 Ohms

1Fan On Minimum Position Off

Setpoint 0% Off Off Off 2.2K

Minimum Ventilation On Selectable Off Off Off Off

2 Economizer Test Open On Open Off Off Off Off 3.3K

3 Cool Stage 1 On Minimum Position On1. Off Off Off 4.7K

43. Cool Stage 2 On Minimum Position On1. On1. Off Off 6.8K

53. Reheat On Minimum On On Off Off 33K

63. Heat Stage 1 On Minimum Off Off On Off 10K

73. Heat Stage 2 On Minimum Off Off On On 15K

Notes:

1. The condenser fans will operate any time a compressor is "On" providing the outdoor air temperatures are within the operating values.

2. The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.

3. Steps for optional accessories and non-applicable modes in unit will be skipped.

Pre-Start

32 RT-SVX33E-EN

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 percent using the

setpoint potentiometer located on the Economizer Control

(ECA), if applicable.

ReliaTel Control

Using the Service Test Guide in Table 7, p. 31, momentarily

jump across the Test 1 & 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) by;

1. Measuring 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

Actual Motor Amps X Motor HP

Motor Nameplate Amps

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 HP output to be below table

value),

a. Relieve supply and/or return duct static.

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

• To Increase Fan RPM; Loosen the pulley adjustment set

screw and turn sheave clockwise.

• To Decrease Fan RPM; Loosen the pulley adjustment

set screw and turn sheave counterclockwise.

• If the required CFM is too high, (external static

pressure is low causing motor HP output to be above

table value), change indoor fan speed and repeat steps

1 and 2.

• To stop the 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).

Return Air Smoke Detector

The return air smoke detector is designed to shut off the

unit if smoke is sensed in the return air stream. Sampling

the airflow entering the unit at the return air opening

performs this function.

In order for the smoke detector to properly sense smoke in

the return air stream, the air velocity entering the 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.

RT-SVX33E-EN 33

Start Up

Economizer Start-Up

Using the Service Test Guide in Table 7, p. 31, momentarily

jump across the Test 1 & 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 Actuator (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 & 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 Table 7, p. 31, continue

the SERVICE TEST start-up procedure for each

compressor circuit.

Momentarily jump across the Test 1 & 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.

Scroll Compressors

a. Once each compressor has started, verify that the

rotation is correct. To check rotation, use a set of

refrigeration gauges hooked up to the suction and

discharge pressure port. If the compressor is

phased correctly the suction pressure should drop

and the discharge pressure should rise when the

compressor starts and runs. If a scroll compressor

is rotating backwards, it will not pump, the suction

and discharge pressure will not rise, and a loud

rattling sound can be observed.

b. If the electrical phasing is incorrect, 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. If the compressor runs backward for

an extended period not to exceed 5 seconds, the

compressor will be damaged the motor winding

can overheat and cause the motor winding

thermostat to open and the oil can turn dark gray.

c. Check the compressor oil levels. The oil level in each

compressor sight glass should be visible in the

compressor sightglass. This only applies to CSHD

compressors, SSA and SPA compressors don't

have sight glasses.

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 the table below. The

appropriate oil charge is also listed below

2. After the compressor and condenser fan have started

and operated for approximately 30 minutes, observe

the operating pressures. Compare the operating

pressures to the operating pressure curve in the

Service Facts.

3. Check system superheat. Follow the instruction listed

on the superheat charging curve in the Service Facts.

Superheat should be within ±5ºF of the superheat chart

value.

4. Repeat steps 1 through 4 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 procedure.

6. 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 the following table. The

appropriate oil charge is also listed below.

Figure 26. Compressor terminal box

Start Up

34 RT-SVX33E-EN

Heating Start-Up

1. Clamp an amp meter around one of 1st stage heater

power wires at the heater contactor.

2. Using the Service Test Guide in Table 7, p. 31, continue

the SERVICE TEST start-up procedure for each

compressor circuit.

Momentarily jump across the Test 1 & 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.

3. Verify that the heater stage is operating properly.

4. Clamp an amp meter around one of 2nd stage heater

power wires at the heater contactor (if applicable).

5. Using the Service Test Guide in Table 7, p. 31, continue

the SERVICE TEST start-up procedure for each

compressor circuit. Momentarily jump across the Test

1 & 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.

6. Verify that the heater stage is operating properly.

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.

Final System Setup

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

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

operating the unit in each of its Modes through all

available stages of cooling & heating), perform these final

checks before leaving the unit:

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

for proper unoccupied operation. Refer to the

programming instructions for the specific panel.

• Verify that the Remote panel “System” selection

switch, “Fan” selection switch, and “Zone

Temperature” settings for automatic operation are

correct.

• 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.

Table 8. Oil charge

Model Circuit 1 Circuit 2

WS*150 56 oz 56 oz

WS*155/WS*180 56 oz 56 oz

WS*200/WS*240 112 oz 112 oz

Table 9. Compressor types

Tonnage C1 C2

WS*150 SSA067 SSA067

WS*155/WS*180 SSA083 SSA083

WS*200/WS*240 CSHD125 CSHD125

RT-SVX33E-EN 35

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 27, p. 35; 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 Figure 27, p. 35.

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

indicates a number other than zero on the plunger’s

force scale. This number represents the force (in

pounds) required to give the needed deflection.

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

appropriate “force” value listed in Table 10, p. 35. 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 Table 10, p. 35.

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”.

Monthly Maintenance

Before completing the following checks, turn the unit OFF

and lock the main power disconnect switch open. Failure

to disconnect power before servicing can cause severe

personal injury or death.

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.

Table 10. Belt tension measurement and deflection

ranges

Deflection Force (Lbs.)

Belts

Cross

Section

Small

P.D

Range

Super

Gripbelts Gripnotch Steel Cable

Gripbelts

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

Figure 27. Belt tension gauge

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

36 RT-SVX33E-EN

Filters

Inspect the return air filters. Clean or replace them if

necessary. Refer to the unit Service Facts for filter

information.

Condensate Overflow Switch

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

checked to ensure free movement up and down.

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.

Cooling Season

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

ensure that there are no blockages.

• Inspect the evaporator and condenser coils for dirt,

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

according to the instructions described in “Coil

Cleaning” later in this section.

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

movement and check motor bearings for wear. Verify

that all of the fan mounting hardware is tight.

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

that all moving parts are securely mounted. Keep the

blades clean as necessary.

• Verify that all damper linkages move freely; lubricate

with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the

motor as necessary.

• Check the fan shaft bearings for wear. Replace the

bearings as necessary.

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

replace it. Refer to the “Fan Belt Adjustment” section

for belt replacement and adjustments.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present 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 11, p. 37. If the operating pressures

indicate a refrigerant shortage, measure the system

superheat. For guidelines, refer to the “Compressor Start-

Up” section.

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.

Coil Cleaning

Regular coil maintenance, including annual cleaning,

enhances the unit’s operating efficiency by minimizing:

compressor head pressure and amperage draw;

evaporator water carryover; fan brake horsepower, due to

increase static pressure losses; airflow reduction.

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

in a “dirty” environment, clean the evaporator and

condenser coils using the instructions outlined below. Be

sure to follow these instructions as closely as possible to

avoid damaging the coils.

To clean refrigerant coils, use a soft brush and a sprayer

(either a garden pump-up type or a high-pressure sprayer).

A high-quality detergent is also required; suggested

brands include “SPREX A.C.”, “OAKITE 161”, “OAKITE 166”

and “COILOX”. If the detergent selected is strongly alkaline

(ph value exceeds 8.5), add an inhibitor.

1. Remove enough panels from the unit to gain access to

the coil. Remove the access panel from the roof located

next to the rear condenser fan.

2. Protect all electrical devices such as motors and

controllers from any over spray.

3. Straighten any bent coil fins with a fin comb.

4. Mix the detergent with water according to the

manufacturer’s instructions. If desired, heat the

solution to 150° F maximum to improve its cleansing

capability.

Maintenance

RT-SVX33E-EN 37

Do not heat the detergent-and-water solution above 150°F.

Hot liquids sprayed on the exterior of the coil will raise the

coil’s internal pressure and may cause it to burst. Failure to

follow proper procedures can result in personal illness or

injury or severe equipment damage.

5. Pour the cleaning solution into the sprayer. If a high-

pressure sprayer is used:

a. do not allow sprayer pressure to exceed 600 psi.

b. the minimum nozzle spray angle is 15 degrees.

c. maintain a minimum clearance of 6" between the

sprayer nozzle and the coil.

d. spray the solution perpendicular (at 90 degrees) to

the coil face.

6. Spray the leaving-airflow side of the coil first; then

spray the opposite side of the coil. Allow the cleaning

solution to stand on the coil for five minutes.

7. Rinse both sides of the coil with cool, clean water.

8. Inspect both sides of the coil; if it still appears to be

dirty, repeat Steps 6 and 7.

9. Reinstall all of the components and panels removed in

Step 1 and any protective covers installed in step 2.

10. Restore the unit to it’s operational status and check

system operation.

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)

_____________________________________________________

__________________

_____________________________________________________

__________________

WARNING

Hazardous Pressures!

If a heat source is required to raise the tank pressure

during removal of refrigerant from cylinders, use only

warm water or heat blankets to raise the tank

temperature. Do not exceed a temperature of 150°F. Do

not, under any circumstances apply direct flame to any

portion of the cylinder. Failure to follow these safety

precautions could result in a sudden rise of pressure

possibly resulting in a violent explosion which could

result in death or serious injury.

Table 11. Sample maintenance log

Refrigerant Circuit #1 Refrigerant Circuit #2

Date Current

Ambient

temp F/C

Compr. Oil

Level

Suction

Pressure

Psig/kPa

Dischcharge

Pressure

Psig/kpa

Super heat

F/C Sub cool

F/C Compr. Oil

Level

Suction

Pressure

Psig/kPa

Dischcharge

Pressure

Psig/kpa

Super heat

F/C Sub cool

F/C

38 RT-SVX33E-EN

Troubleshooting

ReliaTel Controls

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 & 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 ” section, 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 Steps 1 and 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 the “Unit Start-Up” section to

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

of the RTRM outputs, and all of the external controls

(relays, contactors, etc.) that the RTRM outputs

energize, for each respective mode. Proceed to Step 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

Steps 7 and 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 LED’s, use

Method 2. BAYSENS110*, and BAYSENS119* all 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.

“Flashing” indicates an evaporator fan failure or

Condensate Overflow Switch (COF) failure.

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-SVX33E-EN 39

Below is the complete listing of failure

indication causes.

System Failure

Check the voltage between terminals 6 and 9 on J6, it

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

a System failure has occurred. Refer to Step 4 in the

previous section for the recommended troubleshooting

procedure.

Cooling Failure

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

sensor has failed. Refer to the “Zone Sensor Test

Procedure” section.

2. Zone temperature thermistor ZTEMP on ZTS failed.

Refer to the “Zone Sensor Test Procedure” section.

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

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

apply to the unit (HPC1, HPC2).

4. LPC1 has opened during the 3 minute minimum “on

time” during 4 consecutive compressor starts, check

LPC1 or LPC2 by testing voltage between the J1-8 & J3-

2 terminals on the RTRM and ground. If 24 VAC is

present, the LPC’s has not tripped. If no voltage is

present, LPC’s has tripped.

Service Failure

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. Clogged filter switch has closed, check the filters.

Simultaneous Heat and Cool Failure

1. Emergency Stop is activated.

Method 2

The second method for determining system status is done

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

indication descriptions and the approximate voltages are

listed below.

System Failure

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

Normal Operation = approximately 32 Vdc

System Failure = less than 1 Vdc, approximately 0.75 Vdc

Test Mode = voltage alternates between 32 Vdc & 0.75 Vdc

Heat Failure

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

Heat Operating = approximately 32 Vdc

Heat Off = less than 1 VDC, approximately 0.75 Vdc

Heating Failure = voltage alternates between 32 Vdc & 0.75

Vdc

Cool Failure

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

Cool Operating = approximately 32 Vdc

Cool Off = less than 1 Vdc, approximately 0.75 Vdc

Cooling Failure = voltage alternates between 32 Vdc & 0.75

Vdc

Service Failure

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

Clogged Filter = Approximately 32 Vdc.

Normal = Less than 1 Vdc, approximately 0.75 Vdc

Fan Failure = voltage alternates between 32 Vdc & 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 LED’s 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 explains resetting the system

from the space; Method 2 explains resetting the system at

the unit.

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.

Troubleshooting

40 RT-SVX33E-EN

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)

Tests

Note: These procedures are not for programmable or

digital models and are conducted with the Zone

Sensor Module electrically removed from the

system.

Test 1: Zone 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 the chart

above for approximate resistances at the given setpoints.

Cool SP = Terminals 2 and 3

Range = 100 to 900 Ohms approximate

Heat SP = Terminals 2 and 5

Range = 100 to 900 Ohms approximate

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 on the following page with their

corresponding resistance values.

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 LED’s with ZSM connected to unit, test voltages at

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

an unlit LED, means the LED has failed.

Zone Temperature Nominal ZTEMP

Resistance Nominal CSP or

HSP Resistance

50 F° 10.0 C° 19.9 K-Ohms 889 Ohms

55 F° 12.8 C° 17.47 K-Ohms 812 Ohms

60 F° 15.6 C° 15.3 K-Ohms 695 Ohms

65 F° 18.3 C° 13.49 K-Ohms 597 Ohms

70 F° 21.1 C° 11.9 K-Ohms 500 Ohms

75 F° 23.9 C° 10.50 K-Ohms 403 Ohms

80 F° 26.7 C° 9.3 K-Ohms 305 Ohms

85 F° 29.4 C° 8.25 K-Ohms 208 Ohms

90 F° 32.2 C° 7.3 K-Ohms 110 Ohms

Troubleshooting

RT-SVX33E-EN 41

Note: Measurements should be made from LED common

(ZSM terminal 6 to respective LED terminal). Refer

to the Zone Sensor Module (ZSM) Terminal

Identification table at the beginning of this section.

Programmable & Digital Zone

Sensor Test

Testing Serial Communication Voltage

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

11.

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

voltage between J6-11 and J6-12; it 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 “Unit Start-Up”.

5. After verifying proper unit operation, exit the test

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

pressing the button with the fan symbol. If the fan

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

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

defective.

ReliaTel Refrigeration Module (RTRM)

Default Chart

If the RTCI loses input from the building management

system, the RTRM will control in the default mode after

approximately 15 minutes. If the RTRM loses the Heating

and Cooling setpoint input, the RTRM will control in the

default mode instantaneously. The temperature sensing

thermistor in the Zone Sensor Module is the only

component required for the “Default Mode” to operate.

Unit Operation without a Zone Sensor

This procedure is for temporary operation only. The

economizer and condenser fan cycling functions are

disabled.

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.

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.

Table 12. System mode and fan selection chart

Resistance

Valves (Ohms) Zone Sensor

Unit/Fan Mode Local Unit

Mode Local Fan

Mode

2.32K Off/ Auto Off Auto

4.87K Cool/Auto Cool Auto

7.68K Auto/Auto Auto Auto

10.77K Off/On Off On

13.32K Cool/On Cool On

16.13K Auto/On Auto On

19.48K Heat/Auto Heat Auto

27.93K Heat/On Heat On

35.0K Emergency Heat/

Auto Emergency

Heat Auto

43.45K 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

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.

Table 12. System mode and fan selection chart

Resistance

Valves (Ohms) Zone Sensor

Unit/Fan Mode Local Unit

Mode Local Fan

Mode

Troubleshooting

42 RT-SVX33E-EN

Unit Economizer Control (ECA)

Troubleshooting

Table 13. Verify economizer status by economizer

actuator (ECA) LED indicator:

OFF: No Power or Failure

ON: Normal, OK to Economize

Slow Flash: Normal, Not OK to Economize

Fast Flash: 1/2 Second On / 2 Seconds Off:

Error Code:

Communications Failure

Pulse Flash: 2 Second On / 1/2 Second Off:

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

RT-SVX33E-EN 43

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 14. Wiring diagrams

Type of

Airflow Schematic

Type Voltage Diagram

Number Description

Constant

Volume

Power 200-575 2313-1479 WS*150-240, 50/60HZ, Heat Pump with or without Electric Heat

Control 200-575 2313-1488 WS*150-240, 50/60HZ, Heat Pump with or without Electric Heat, with or without

Dehumidification

2313-1495 WS*150-240, 50/60HZ, with or without Dehumidification, Option Modules

Raceway

Connections 200-575 2313-1515 WS*150-240, 50/60HZ, Heat Pump, with or without Dehumidification

Control Box

Connections 200-230 2313-1499 WS*150-240, 50/60HZ, Heat Pump, with or without Dehumidification

380-575 2313-1500 WS*150-240, 50/60HZ, Heat Pump, with or without Dehumidification

Variable Air

Volume/

Multi-speed

Fans/ Single

Zone Variable

Air Volume

Power 208-575 2313-1483 WS*150-240, 60HZ, Heat Pump with or without Electric Heat

Control 208-575 2313-1492 WS*150-240, 60HZ, Heat Pump with or without Electric Heat, with or without

Dehumidification

2313-1495 WS*150-240, 60HZ, with or without Dehumidification, Option Modules

Raceway

Connections 208-575 2313-1519 WS*150-240, 60HZ, Heat Pump, with or without Dehumidification

Control Box

Connections 208-230 2313-1507 WS*150-240, 60HZ, Heat Pump, with or without Dehumidification

460-575 2313-1508 WS*150-240, 60HZ, Heat Pump, with or without Dehumidification

Note: * = Downflow and horizontal airflow

Table 15. Wiring diagrams for units with High Short Circuit Rating (SCCR)

Type of

airflow Schematic

Type Voltage Diagram

Number Description

Constant

Volume

Power 208-575 2313-1578 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Control 208-575 2313-1583 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

208-575 2313-1590 WS*180-300, 60HZ, Heat Pump with or without Electric Heat, Options Modules

Raceway

Connection 208-575 2313-2020 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Control Box

Connections 208-575 2313-2003 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Module

Connections 208-575 2313-2049 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Multi-speed

Fans/ Single

Zone Variable

Air Volume

Power 208-575 2313-1578 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Control 208-575 2313-1587 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

208-575 2313-1590 WS*180-300, 60HZ, Heat Pump with or without Electric Heat, Options Modules

Raceway

Connection 208-575 2313-2024 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Control Box

Connections 208-575 2313-2007 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Module

Connections 208-575 2313-2053 WS*180-300, 60HZ, Heat Pump with or without Electric Heat

Note: * = Downflow and horizontal airflow

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.

© 2014 Trane All rights reserved

RT-SVX33E-EN 27 May 2014

Supersedes RT-SVX33D-EN (17 Jan 2014)

Warranty

Heat Pump

WSD, WSH (Parts Only)

Models Less Than or Equal to 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 Heat Pump 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 Heat Pump fails because of a

manufacturing defect within one year from initial start-up

or 18 months from date of shipment - whichever is lesser-

Warrantor will furnish without charge the required

replacement part.

In addition, if the sealed motor-compressor fails because

of a manufacturing defect within the second through fifth

year from the date of original purchase, Warrantor will

furnish without charge the required replacement

compressor. 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 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-604-4800

* This warranty is for commercial usage of said equipment

and not applicable when the equipment is used for a

residential application. Commercial use is any application

where the end purchaser uses the product for other than

personal, family or household purposes.

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

Leak Economizer, when combined with the optional FDD

(Fault Detection & Diagnostics) option.