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

2015-04-02

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Installation, Operation,
and Maintenance

Packaged Rooftop Air Conditioners
Voyager™ – Heat Pump
12½ – 20 Ton, 60/50 Hz

Model Numbers

WS*150-240

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

May 2014

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.

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.

ATTENTION: Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. Read
these carefully:
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
CAUTIONs situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
Indicates a situation that could result in
NOTICE: equipment or property-damage only

WARNING

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.

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.

RT-SVX33E-EN

Warnings, Cautions and Notices

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

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 Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

Model Number Description
W

Digit 15 — Supply Fan/Drive
Type/Motor

Digit 21 — Communications
Options

=
=
=
=

Digit 3 — Airflow Configuration

0
1
3
6

D
H

7
8

=
=

9
A

=
=

Digit 1 — Unit Type
W =

Packaged Cooling, Electric Heat

Digit 2 — Efficiency
S

=
=
=

Standard Efficiency
Downflow
Horizontal

Digit 4, 5, 6 — Nominal Gross
Cooling Capacity (MBh)
150 =
155 =
180 =
200 =
240 =

12½ Tons, 60Hz
15 Tons, 50Hz
15 Tons, 60Hz
20 Ton, 50Hz
20 Tons, 60Hz

Digit 7 — Major Design
Sequence
E

R-410A Refrigerant

Digit 8 — Voltage Selection
3
4
W
T
D

=
=
=
=
=

208-230/60/3
460/60/3
575/60/3
200/50/1
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
D

=
=

M =
P

No Fresh Air
Econ Dry Bulb w/ Barometric
Relief1
Econ Reference Enthaply w/
Barometric Relief1
Econ Comparative Enthaply w/
Barometric Relief1
Low Leak Econ w/ Barometric
Relief1
Low Leak Econ Reference
Enthalpy w/ Barometric Relief1
Low Leak Econ Comparative
Enthalpy w/ Barometric Relief1

RT-SVX33E-EN

Standard Motor
Oversized Motor2
High Efficiency Motor2
Single Zone Variable Air Volume
Standard Motor
Multi-Speed Standard Motor
Single Zone Variable Air Volume
Oversized Motor
Multi-Speed Oversized Motor
Single Zone Variable Air Volume
Standard Motor w/ Shaft Ground
Ring
Multi-Speed Standard Motor w/
Shaft Ground Ring
Single Zone Variable Air Volume
Oversized Motor w/ Shaft Ground
Ring
Multi-Speed Oversized Motor w/
Shaft Ground Ring

Digit 16 — Hinged Service
Access / Filters
0

A
B

=
=

Standard Panels/Standard
Filters13
Hinged Access/Standard Filters13
Standard Panels / 2" MERV 8
Filters2
Hinged Access / 2" MERV 8
Filters2
Standard Panels / MERV 13
Filters2
Hinged Access / MERV 13 Filters2

Digit 22 — Refrigeration System
Option
0

0
1

=
=

0
A
B
C

=
=
=
=

Digit 18 — Through The Base
Provisions

0
A
D

Digit 20 — Convenience Outlet
Option

0
A
B

=
=
=

Standard Coil
Standard Coil With Hail Guard
Black Epoxy Pre-Coated Coil
Black Epoxy Pre-Coated Coil with
Hail Guard

No Through The Base Provisions
Through The Base Electric3
Through The Base Utilities Access

Digit 19 — Disconnect Switch/
Circuit Breaker4
0
1

=
=

=
=
=

No Disconnect/circuit break
Unit Mounted Non-Fused
Disconnect Switch
Unit Mounted Circuit Breaker

Without Convenience Outlet
Unpowered Convenience Outlet5
Powered Convenience Outlet5

Without Smoke Detector
Return Air Smoke Detector
Supply Air Smoke Detector
Return/Supply Air Smoke
Detector
Plenum Smoke Detector9

Digit 25 — System Monitoring
Controls6

=
=
=
=

Without Refrigeration Controls
Frostat6

Digit 24 — Smoke Detector7, 8

=
=
=
=
=

0
1
2
3

Standard refrigeration system

Digit 23 — Refrigeration
Controls

0
1
2
3
4

Digit 17 — Condenser Coil
Protection

Without Communications
Options
Trane Communications
Interface
Lontalk Communications
Interface
Building Automation Control
Network Communications
Interface

No Monitoring Controls
Clogged Filter Switch
Fan Failure Switch
Discharge Air Sensing
Clogged Filter Switch and Fan
Failure
Clogged Switch and Discharge Air
Sensing
Fan Failure Switch and Discharge
Air Sensing
Clogged Filter Switch, Fan Failure
Switch and Discharge Air Sensing
Condensate Drain Pan Overflow
Switch
Clogged Filter Switch and
Condensate Drain Pan Overflow
Switch
Fan Failure Switch and
Condensate Drain Pan Overflow
Switch
Discharge Air Sensing and
Condensate Drain Pan Overflow
Switch
Clogged Filter Switch, Fan Failure
Switch and Condensate Drain Pan
Overflow Switch
Clogged Filter Switch, Discharge
Air Sensing Tube and Condensate
Drain Pan Overflow Switch
Fan Failure Switch, Discharge Air
Sensing Tube and Condensate
Drain Pan Overflow Switch

Model Number Description

Digit 26 - System Monitoring
Controls
0
A

=
=

No Monitoring Controls
Demand Control Ventilation
(CO2)10
FDD (Fault Detection and
Diagnostics)
FDD (Fault Detection Diagnostics)
& Demand Control Ventilation
(CO2)10

Digit 27 - Unit Hardware
Enhancements
0
1

=
=

No Enhancements
Stainless Steel Drain Pan

Digit 28 - Short Circuit Current
Rating
0
A

=
=

Standard SCCR
65kA SCCR Option11, 12

Digit 31 - Advanced Unit
Controls
0
1

=
=

Condensate Overflow Switch,
Discharge Air Sensing Kit, Frostat,
Ventilation Override, Smoke
Detector, Dehumidification and
Modulating Gas Heat Furnace.

Clogged Filter Switch, Fan Failure
Switch, Discharge Air Sensing
and Condensate Drain Pan
Overflow Switch

Standard Unit Controls
Human Interface14

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.

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).

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 Throughthe-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,

RT-SVX33E-EN

General Information
Unit Inspection
As soon as the unit arrives at the job site:
•

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

•

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

•

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

•

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.

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.

Precautionary Measures

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.

•

Avoid breathing fiberglass dust.

•

Use a NIOSH approved dust/mist respirator.

The condenser coils are aluminum fin, mechanically
bonded to copper tubing.

•

Avoid contact with the skin or eyes. Wear long-sleeved,
loose-fitting clothing, gloves, and eye protection.

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

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.

RT-SVX33E-EN

This module through Proportional/Integral control
algorithms perform specific unit functions that governs
unit operation in response to; zone temperature, supply air
7

General Information
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.

RT-SVX33E-EN

General Information
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%.

RT-SVX33E-EN

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
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, autochangeover 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, autochangeover digital display thermostat. It is a nonprogrammable, wall-mounted thermostat.

Thermostat (BAYSTAT155)
This thermostat is a multi-stage 3 heat/2 cool, auto
changeover digital display thermostat. It is a nonprogrammable, 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
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Unit Dimensions
Figure 1.

Typical installation clearances for single & multiple unit applications

5' 8"

WITHOUT ECONOMIZER
WITH ECONOMIZER

5' 0"

RT-SVX33E-EN

Unit Dimensions
Figure 2.

Heat pump models - 12½ - 15 tons

85 5/16"
2167MM
122 5/16"
3107MM

13/16"
20MM

FILTER
ACCESS DOOR
HORIZONTAL

54"
1372MM

1"
25.4MM
6 7/16"
163.51MM

DOWNFLOW CONDENSATE
DRAIN CONN 1" (25.4MM) NPT

48 1/2"
1231.90MM
56"
1422MM

SINGLE POINT
POWER ENTRY

33 3/16"
843MM
7/8" (22.23MM) DIA. HOLE
(UNIT CONTROL WIRE)

6 13/16"
173MM

121 11/16"
3091MM

8 15/16"
227MM
2 11/16"
68.26MM

84 3/16"
2154MM

SERVICE GAUGE
PORT ACCESS

3" (76MM) DIA HOLE
(UNIT POWER WIRE)

* All dimensions are in inches/millimeters.

Figure 3.

Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

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Unit Dimensions
Figure 4.

Heat pump models - 12½ - 15 tons

Figure 5.

Heat pump models - 12½ - 15 tons

1”
25.4 MM
CURB FLANGE
LONG SIDES
SHORT SIDES

* All dimensions are in inches/millimeters.

* 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.

Figure 6.

Heat pump models - 12½ - 15 tons

* All dimensions are in inches/millimeters.

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Unit Dimensions
Figure 7.

Heat pump models - 20 tons

85 5/16"
2167MM
122 5/16"
3107MM

13/16"
20MM

FILTER
ACCESS DOOR
HORIZONTAL

64 1/8"
1629MM

1"
25.4MM
6 7/16"
163.51MM

DOWNFLOW CONDENSATE
DRAIN CONN 1" (25.4MM) NPT

48 1/2"
1231.90MM

33 3/16"
843MM

56"
1422MM

SINGLE POINT
POWER ENTRY

7/8" (22.23MM) DIA. HOLE
(UNIT CONTROL WIRE)

6 13/16"
173MM

121 11/16"
3091MM

8 15/16"
227MM
2 11/16"
68.26MM

84 3/16"
2154MM

SERVICE GAUGE
PORT ACCESS

3" (76MM) DIA HOLE
(UNIT POWER WIRE)

* All dimensions are in inches/millimeters.

Figure 8.

Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

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Unit Dimensions
Figure 9.

Heat pump models - 20 tons

* All dimensions are in inches/millimeters.

Figure 10.

Heat pump models - 20 tons

Figure 11.

Heat pump models - 20 tons

1”
25.4 MM
CURB FLANGE
LONG SIDES
SHORT SIDES

* All dimensions are in inches/millimeters.

* 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.

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Unit Dimensions
Figure 12. Downflow & horizontal condensate locations

Table 1.

Unit dimensions
Condensate Drain Location
Downflow Only

Tons

12½, 15, 20

26 7/16

28 3/4

19 15/16

4 1/4

76 5/16 68 11/16

Condensate
Drain Size
1 NPT

Downflow

Horizontal

26 3/4

5 3/8

Figure 13. Through the base utility locations and access panel swing clearances
TOP VIEW SHOWING THROUGH THE BASE
ELECTRICAL UTILITY LOCATIONS AND ACCESS PANEL SWING CLEARANCES.

6 7/8"
SWING RADIUS (E)
HORIZONTAL FILTER
ACCESS PANEL

SWING RADIUS (A)
ID SECTION
ACCESS PANEL
SWING RADIUS (D)
ID FAN SECTION
ACCESS PANEL

Table 2.

SWING RADIUS (C)
OD SECTION
ACCESS PANEL

THROUGH THE
BASE ELECTRICAL

Swing clearances

Unit Model #

WSD150-180

42 3/8

48 3/8

WSD240

29 1/2

WSH150-180

42 3/8

N/A

WSH240

29 1/2

N/A

38 1/2

18 1/2

N/A

38 1/2

18 1/2

Note: All dimensions are in inches.

RT-SVX33E-EN

Unit Weights
Table 3.

Typical unit weights and point loading data
Corner Weights
(lbs.)

Center of
Gravity (in.)

Unit
Description

Net
Weight

WS*150

1978

633

514

376

455

WS*155

1982

634

515

377

456

WS*180

1982

634

515

377

456

WS*200

2107

674

485

400

590

WS*240

2107

674

485

400

590

Length Width

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.
Figure 14. Rigging and center of gravity data

Note: Corner weights are given for information only. Unit is to be supported
continuously by a curb or equivalent frame support.

Rigging
Refer to Figure 14 and Table 3 for typical unit operating
weights rigging before proceeding.

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.
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.

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Installation
Foundation

All outdoor ductwork between the unit and the structure
should be weather proofed after installation is completed.

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.
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.

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 Table 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.
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.

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 factoryprovided 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
•

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 watertight flexible connector at the unit to prevent operating
sounds from transmitting through the ductwork.
18

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.

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Installation

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 doubletrap condition which could result in condensate backup
due to “air lock”.
Figure 15. Condensate trap installation

Electrical Requirements
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.

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

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.

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.

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.

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Installation
Note: If the unit is not equipped with an optional factory
installed nonfused disconnect switch or circuit
breaker, a field supplied disconnect switch must be
installed at or near the unit in accordance with the
National Electrical Code (NEC latest edition).

Figure 16. Through the base electrical option

Main Unit Power
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.

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.

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;
RT-SVX33E-EN

Installation
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.

Figure 17.

Reliatel conventional thermostat field wiring
diagram

RTRM

NOTICE:
Component Failure!
Resistance in excess of 3 ohms per conductor could
result in component failure due to insufficient AC
voltage supply.
3. Be sure to check all loads and conductors for grounds,
shorts, and mis-wiring.
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
5. Route low voltage wiring per illustrations on Figure 17,
p. 21.
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)

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.
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)

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

BAYSENS075*
ASYSTAT669*
BAYSENS107*
BAYSTAT023*

BAYSENS119*
ASYSTAT666*

BAYSENS077*
ASYSTAT669*

BAYSENS075*
ASYSTAT669*
BAYSENS073*
BAYSENS109*

BAYSENS075*
ASYSTAT669*
BAYSENS074*
BAYSENS109*

RT-SVX33E-EN

Installation

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

RT-SVX33E-EN

Installation
Table 6.

Temperature vs. resistance

Example: If the voltage readings of the supply power
measured 221, 230, and 227, the average volts would be:

Temperature

221 + 230 + 227
----------------------------------------------- = 2.2percent
3

Degrees F°

Degrees C°

Nominal Resistance

-20°

-28.9°

170.1 K - Ohms

VD (reading farthest from average) = 221

-15°

-26.1°

143.5 K - Ohms

The percentage of Imbalance equals:

-10°

-23.3°

121.4 K - Ohms

-5°

-20.6°

103.0 K - Ohms

0°

-17.8°

87.56 K - Ohms
74.65 K - Ohms

226 – 221
100  ---------------------------- = 2.2percent

226 

The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%. This much
imbalance between phases can equal as much as a 20%
current imbalance with a resulting increase in motor
winding temperatures that will decrease motor life. If the
voltage imbalance is over 2%, notify the proper agencies
to correct the voltage problem before operating this
equipment.

5°

-15.0°

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

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:

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

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.

95°

35.0°

6.528 K - Ohms

•

100°

37.8°

5.824 K - Ohms

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

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.

Voltage Imbalance

• Black (phase A) to L1

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.

• Red (phase B) to L2
•

Close the field supplied main power disconnect switch
or circuit protector switch that provides the supply
power to 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:

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.

% Voltage Imbalance =
AV – VD
100  -----------------------
AV

• Yellow (phase C) to L3

where Average Voltage (AV);
Volt1 + Volt2 + Volt3
AV =  -----------------------------------------------------------------


3

V1, V2, V3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest from
the average voltage.
24

RT-SVX33E-EN

Installation

Compressor Crankcase Heaters
NOTICE:
Compressors Failure!

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.

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.

•

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.

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.

•

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.

Unit must be powered and crankcase heaters energized
at least 8 hours BEFORE compressors are started. This
will protect the compressors from premature failure.

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 selfdiagnostic checks to insure that all internal controls are
functional. It also checks the configuration parameters
against the components connected to the system. The
Liteport LED located on the RTRM module is turned “On”
within one second of power-up if internal operation is
okay.
Use one of the following “Test” procedure to bypass some
time delays and to start the unit at the control panel. Each
step of unit operation can be activated individually by
temporarily shorting across the “Test” terminals for two to
three seconds. The Liteport LED located on the RTRM
module will blink when the test mode has been initiated.
The unit can be left in any “Test” step for up to one hour
before it will automatically terminate, or it can be
terminated by opening the main power disconnect switch.
Once the test mode has been terminated, the Liteport LED
will glow continuously and the unit will revert to the
“System” control.

RT-SVX33E-EN

Factory-Mounted Unit Options
Circuit Breaker (FIYUCB) & Unit
Disconnect (FIYUDC)
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

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.
Figure 20. Main power entrance for units with factory
mounted disconnect or circuit breaker

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
26

RT-SVX33E-EN

Factory-Mounted Unit Options

Powered/Unpowered
Convenience Outlet
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

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.

Figure 21. Wiring schematic 12½ through 25 ton options

RT-SVX33E-EN

Factory-Mounted Unit Options

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.
Figure 22. Power options

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!

A - Powered

B - Powered

Return Air Smoke Detector
Pre-Requisite

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.
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.

Note: The following field installation instructions apply
to downflow only. Horizontal return air smoke
detectors require no field installation.

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.

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.

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.

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.

Figure 23. Brackets

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:
28

RT-SVX33E-EN

Factory-Mounted Unit Options
Figure 24. Return air smoke detector for downflow units

TWO PIECE HOOD

PLASTIC ELBOW

METAL INTAKE TUBE

SMOKE DETECTOR

COPPER TUBE
(FACTORY INSTALLED)

VINYL TUBES (7-3/4 INCHES LONG)

VINYL TUBES (2 INCHES LONG)

METAL EXHAUST TUBE
(16.34 INCHES LONG)

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

RT-SVX33E-EN

TUBES INSTALL FROM BOTTOM,
TOP DOES NOT NEED TO BE
REMOVED FROM SMOKE DETECTOR

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.

Factory-Mounted Unit Options
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.

Figure 25. Smoke detector wiring scheme

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.

•

Important:

Refer to the service literature provided for
testing and other information about the
smoke detector or if problems are
encountered.

RT-SVX33E-EN

Pre-Start
Test Modes
There are three methods in which the “Test” mode can be
cycled at LTB-Test 1 and LTB-Test 2.
1. Step Test Mode - This method initiates the different
components of the unit, one at a time, by temporarily
shorting across the two test terminals for two to three
seconds.
For the initial start-up of the unit, this method allows
the technician to cycle a component “On” and have up
to one hour to complete the check.
2. Resistance Test Mode - This method can be used for
start-up providing a decade box for variable resistance
outputs is available. This method initiates the different
components of the unit, one at a time, when a specific
Table 7.

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.

Service test guide for component operation

TEST STEP
1
2

MODE

Fan

Econ2.

Comp 1

Comp 2

Heat 1

Heat 2

Fan

Minimum Position Off
Setpoint 0%

Off

2.2K

Minimum Ventilation

Selectable

Off

Economizer Test Open

Open

Off

3.3K

Ohms

Cool Stage 1

Minimum Position

On1.

Off

4.7K

43.

Cool Stage 2

Minimum Position

On1.

Off

6.8K

53.

Reheat

Minimum

Off

33K

63.

Heat Stage 1

Minimum

Off

10K

73.

Heat Stage 2

Minimum

Off

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.

RT-SVX33E-EN

Pre-Start

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.

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.

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).

RT-SVX33E-EN

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.

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.

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).

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.

Compressor Start-Up

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.

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 startup component Test is started.

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

6. The Copeland, SSA and SPA scroll compressors for R410A 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

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.

RT-SVX33E-EN

Start Up
Table 8.

Oil charge

Model

Circuit 1

Circuit 2

WS*150

56 oz

WS*155/WS*180

56 oz

WS*200/WS*240

112 oz

Table 9.

•

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.

Compressor types

Tonnage

WS*150

SSA067

WS*155/WS*180

SSA083

WS*200/WS*240

CSHD125

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.

RT-SVX33E-EN

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

Note: Actual belt deflection “force” must not exceed the
maximum “force” value shown in Table 10, p. 35.
Table 10. Belt tension measurement and deflection
ranges
Deflection Force (Lbs.)

WARNING
Rotating Components!

Belts
Small
Cross
P.D
Section Range

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.
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.

Super
Gripbelts

Gripnotch
Min.

Max.

Steel Cable
Gripbelts

Min.

Max.

Min.

Max

3.0 - 3.6

4 1/2

3 7/8

5 1/2

3 1/4

3.8 - 4.8

3 1/2

4 1/2

6 1/4

3 3/4

4 3/4

5.0 - 7.0

5 1/2

6 7/8

4 1/4

5 1/4

3.4 - 4.2

5 1/2

5 3/4

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

8 3/4

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

Figure 27.

Belt tension gauge

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 Oring is even with the top of the next belt or even with
a straightedge placed across the fan and motor
sheaves. Refer to Figure 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.

RT-SVX33E-EN

Monthly Maintenance
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.
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.

Maintenance
Filters

•

Inspect the return air filters. Clean or replace them if
necessary. Refer to the unit Service Facts for filter
information.

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);

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

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 StartUp” 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.

•

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

Coil Cleaning

•

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.

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.

•

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.)

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.

RT-SVX33E-EN

Maintenance
8. Inspect both sides of the coil; if it still appears to be
dirty, repeat Steps 6 and 7.

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.

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:

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 highpressure sprayer is used:

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

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

_____________________________________________________
__________________
— schematic(s)

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.

— connection(s)

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.

(2) Unit Serial Number:

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

Table 11.

_____________________________________________________
__________________
_____________________________________________________
__________________

Sample maintenance log
Refrigerant Circuit #1

Date

Suction
Current
Compr. Oil
Pressure
Ambient
Level
Psig/kPa
temp F/C

RT-SVX33E-EN

Dischcharge
Pressure
Psig/kpa

Refrigerant Circuit #2
Super heat Sub cool
F/C
F/C

Suction
Compr. Oil
Pressure
Level
Psig/kPa

Dischcharge
Pressure
Psig/kpa

Super heat Sub cool
F/C
F/C

Troubleshooting
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.

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.

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.

ReliaTel Controls

System Status Checkout
Procedure

The RTRM has the ability to provide the service personnel
with some unit diagnostics and system status information.

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

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:

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.

System status

LED 3 (Cool)

Heating status

“On” when the cooling cycle is operating.

Cooling status

“Off” when the cooling cycle terminates or the LED fails.

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
38

Method 1

“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.
RT-SVX33E-EN

Troubleshooting
Below is the complete listing of failure
indication causes.

Cool Failure

System Failure

Cool Operating = approximately 32 Vdc

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.

Cool Off = less than 1 Vdc, approximately 0.75 Vdc

Cooling Failure

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

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 & J32 terminals on the RTRM and ground. If 24 VAC is
present, the LPC’s has not tripped. If no voltage is
present, LPC’s has tripped.

Service Failure
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.

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

Cooling Failure = voltage alternates between 32 Vdc & 0.75
Vdc

Service Failure
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.

System Failure

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.

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

Method 1

Normal Operation = approximately 32 Vdc

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.

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

RT-SVX33E-EN

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.
39

Troubleshooting

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

Zone Temperature

Nominal ZTEMP Nominal CSP or
Resistance
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

Test 2: Cooling Set Point (CSP) and
Heating Set Point (HSP)

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”.

The resistance of these potentiometers are measured
between the following ZSM terminals. Refer to the chart
above for approximate resistances at the given setpoints.

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.

Range = 100 to 900 Ohms approximate

This LED being turned “On”, will have no other affect on
unit operation. It is an indicator only.

Range = 100 to 900 Ohms approximate

Fan Failure Switch

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.

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.

Cool SP = Terminals 2 and 3
Heat SP = Terminals 2 and 5

Test 3: System Mode and Fan Selection

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.

RT-SVX33E-EN

Troubleshooting
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

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.
1. Verify 24 Vac is present between terminals J6-14 & J611.
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.
Table 12. System mode and fan selection chart
Local Unit
Mode

Local Unit
Mode

Local Fan
Mode

43.45K

Emergency Heat/
On

Emergency
Heat

Out of Range
(Short)

INVALID/Short

Invalid (CV),
Auto (VAV)

Invalid

Out of Range
(Open)

INVALID/Open

Invalid (CV), Off
(VAV)

Invalid

If the RTCI loses input from the building management
system, the RTRM will control in the default mode after
approximately 15 minutes. If the RTRM loses the Heating
and Cooling setpoint input, the RTRM will control in the
default mode instantaneously. The temperature sensing
thermistor in the Zone Sensor Module is the only
component required for the “Default Mode” to operate.

Unit Operation without a Zone Sensor
This procedure is for temporary operation only. The
economizer and condenser fan cycling functions are
disabled.

WARNING
Hazardous Voltage!
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.
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.

Local Fan
Mode

2.32K

Off/ Auto

Off

Auto

4.87K

Cool/Auto

Cool

Auto
Auto

7.68K

Auto/Auto

Auto

10.77K

Off/On

Off

13.32K

Cool/On

Cool

16.13K

Auto/On

Auto

19.48K

Heat/Auto

Heat

Auto

27.93K

Heat/On

Heat

35.0K

Emergency Heat/
Auto

Emergency
Heat

Auto

RT-SVX33E-EN

Resistance
Zone Sensor
Valves (Ohms) Unit/Fan Mode

ReliaTel Refrigeration Module (RTRM)
Default Chart

WARNING
Live Electrical Components!

Resistance
Zone Sensor
Valves (Ohms) Unit/Fan Mode

Table 12. System mode and fan selection chart

Troubleshooting

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
1/2 Second On / 2 Seconds Off:

Fast Flash:

Error Code:
Communications Failure

Pulse Flash:

2 Second On / 1/2 Second Off:

1 Flash:

Actuator Fault

Error Code:

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

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

Constant
Volume

Variable Air
Volume/
Multi-speed
Fans/ Single
Zone Variable
Air Volume

Schematic
Type

Voltage

Diagram
Number

Power

200-575

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

Control

200-575

2313-1488

Description
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

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
Control Box
Connections

208-575

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

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
Power
Control

Constant
Volume

Diagram
Number

Description

208-575

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

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

Power

208-575

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

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

Control
Multi-speed
Fans/ Single
Zone Variable
Air Volume

Voltage

Note: * = Downflow and horizontal airflow

RT-SVX33E-EN

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.

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

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 lesserWarrantor will furnish without charge the required
replacement part.

* 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.

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.

*A 5 year limited warranty is provided for the optional Low
Leak Economizer, when combined with the optional FDD
(Fault Detection & Diagnostics) option.

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.

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.
© 2014 Trane All rights reserved
RT-SVX33E-EN 27 May 2014
Supersedes RT-SVX33D-EN (17 Jan 2014)

We are committed to using environmentally
conscious print practices that reduce waste.

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Subject                         : Packaged Rooftop Unit Voyager - Heat Pump 12.5 - 20 Ton
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Trane Voyager 12 5 To 25 Tons Installation And Maintenance Manual Installation, Operation,

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