Trane WSC036E, WSC120E Installation, Operation And Maintenance Manual

Page 1

Installation, Operation, and Maintenance

Packaged Rooftop Air Conditioners Precedent™ — Heat Pump

3–10Tons–60Hz

Model Numbers

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.

October 2013

WSC036E - WSC120E

SAFETY WARNING

RT-SVX23F-EN

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Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note thatwarnings,

cautions and notices appear at appropriate intervals throughout this manual. Warnings are provided to alert installing contractors to potentialhazards that could result in death or personal injury. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could 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.

Read this manual thoroughlybefore operatingor servicing this unit.

ATTENTION: Warnings, Cautions, and Notices appear at

appropriate sections throughout this literature. Read these carefully:

WARNING

CAUTIONs

NOTICE:

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

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

Indicates a situation that couldresult in equipment or property-damage only accidents.

Important Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment.Trane advocates the responsiblehandling 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.

WARNING

Proper FieldWiring and Grounding Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

WARNING

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 Personal ProtectiveEquipment (PPE) recommended for the work being undertaken.

ALWAYS refer to appropriate MSDS sheets and OSHA

guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS sheets and

OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put on all Personal Protective Equipment (PPE) in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR to servicing the unit.

Failure to follow recommendations could result in death or serious injury.

Revision Summary

RT-SVX23F-EN (15 Oct 2013)

• Human Interface - 5 inch ColorTouchscreen

RT-SVX23F-EN (18 July 2012)

• MERV 8 filter with filter removal tool

• Stainless steel drain pan, condensate overflow switch

• Updated Model Number Description, Maintenance, Troubleshooting

Page 3

Table of Contents

Warnings, Cautions and Notices .......... 2

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

Model Number Notes ................. 6

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

Unit Nameplate ....................... 7

Compressor Nameplate ................ 7

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

Economizer Control Actuator (Optional) . 7

RTCI - ReliaTel™ Trane® Communication In-

terface (Optional) .................... 7

RLCI - ReliaTel™ LonTalk® Communication

Interface (Optional) .................. 7

RBCI - ReliaTel™ BACnet™ Communications

Interface (Optional) .................. 7

RTOM – ReliaTel™ Options Module ..... 7

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

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

Pre-Installation ......................... 17

Unit Inspection ..................... 17

Storage ........................... 17

Unit Clearances .................... 17

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

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

Ductwork .......................... 19

Roof Curb ......................... 21

Rigging ........................... 22

General Unit Requirements ............ 23

Factory Installed Economizer ......... 23

Temperature Limit Switch Usage for Electric

Heat Units ......................... 23

Horizontal Discharge Conversion WSC036E,

WSC048E (3 - 4 Ton Units) ............ 23

Horizontal Discharge Conversion WSC060-

120E (5 - 10 Ton Units) ............... 24

TCO-A Instructions .................. 25

Return Air Smoke Detector ........... 25

Main Electrical Power Requirements . . . 26

Electric Heat Requirements ........... 26

Low Voltage Wiring

(AC & DC) Requirements ............. 26

Condensate Drain Configuration ....... 27

Filter Installation .....................27

Field Installed Power Wiring ...........28

Main Unit Power Standard Wiring ......28

Main Unit Power Optional TBUE Wiring

(Through-the-Base Electrical Option) ....28

Field Installed Control Wiring ..........29

Smoke Detector - (ReliaTel™ Only) Customer

Low Voltage Wiring ..................32

Pre-Start ................................33

Space Temperature Averaging (ReliaTel™

only) ..............................33

Voltage Imbalance ...................35

Electrical Phasing (Three Phase Motors) .36

Compressor Crankcase Heaters (Optional on WSC036E*, WSC048E1, and WSC060E1 -

Standard on Remaining Units) .........36

ReliaTel™ Controls ..................36

Test Modes .........................37

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

Verifying Proper Air Flow ...............38

Units with 5-Tap Direct Drive Indoor Fan .38

Units with Belt Drive Indoor Fan ........39

ReliaTel™ Units with Direct Drive Indoor Fan

(7.5 - 10 Ton Units) ...................39

Return Air Smoke Detector ............40

Economizer Start-Up ReliaTel™ Control .40

Compressor Start-Up .................41

Heating Start-Up ....................41

Final System Setup ..................42

Maintenance ............................43

Fan Belt Adjustment - Belt Drive Units ....43

Monthly Maintenance ..................44

Filters ..............................44

Return Air Smoke Detector Maintenance .44

Condensate Overflow Switch ..........44

Cooling Season .....................44

Heating Season .....................44

Coil Cleaning .......................44

Final Process ........................46

Troubleshooting .........................47

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Table of Contents

System Status Checkout Procedure ..... 47

Method 1 .......................... 47

Method 2 .......................... 48

Resetting Cooling and Heating Lockouts 48

Zone Temperature Sensor (ZTS) Service Indi-

cator .............................. 49

Clogged Filter Switch ................ 49

Fan Failure Switch .................. 49

Condensate Overflow Switch ......... 49

Zone Temperature Sensor (ZTS) Test . . 49

Programmable & Digital Zone

Sensor Test ........................ 50

Unit Economizer Control (ECA) Trouble-

shooting ReliaTel Control ............ 50

Troubleshooting Procedures for Direct Drive

Plenum Fan ........................ 51

Wiring Diagrams ....................... 52

Limited Warranty ....................... 53

Heat Pump WCC, WCD, WCH, WCM and WSC

(Parts Only) ........................ 53

Heat Pump WCZ, WCY, WCX, WCC, WCD, WCH, WCM, WCP and WSC (Parts Only) 54

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Model Number Description

WSC 120 E 4 R 0 A **

123 456 7 8 9 10 11 1213

Digit 1 - UnitType

W Packaged Heat Pump

Digit2-Efficiency

S Standard Efficiency

Digit 3 - Airflow

C Convertible

Digit 4,5,6 - Nominal Gross Cooling Capacity (MBh)

036 3Ton 048 4Ton 060 5Ton 072 6Ton 090 7½Ton, Single Compressor 120 10 Ton

Digit 7 - Major Design Sequence

E R-410A Refrigerant

Digit 8 - Voltage Selection

1 208-230/60/1 3 208-230/60/3 4 460/60/3

W 575/60/3

Digit 9 - Unit Controls

R ReliaTel™ Microprocessor

Digit 10 - Heating Capacity

0=No Electric Heat F=14 kW (1 phase) A=5 kW (1 phase)1G=18 kW (1&3 phase) B=6 kW (3 phase) J=23 kW (3 phase) C=9 kW (3 phase) K= 27 kW (3 phase) D=10 kW (1 phase) E=12 kW (3 phase) P = 54 kW (3 phase)

N = 36 kW (3 phase)

Digit 11 - Minor Design Sequence

A First Sequence

Digit 12,13 - Service Sequence

** Factory Assigned

Digit 14 - Fresh Air Selection

0 No Fresh Air A Manual Outside Air Damper 0-50% B Motorized Outside Air Damper

C Economizer, Dry Bulb 0-100%

D Economizer, Dry Bulb 0-100%

E Economizer, Reference Enthalpy

F Economizer, Reference Enthalpy

G Economizer, Comparative

H Economizer, Comparative

0-50%

without Barometric Relief

with Barometric Relief

0-100% without Barometric Relief

0-100% with Barometric Relief

Enthalpy 0-100% without Barometric Relief

Enthalpy 0-100% with Barometric

Relief

Digit 15 - Supply Fan/DriveType/ Motor

0 Standard Drive 1 Oversized Motor 2 Optional Belt Drive Motor 6 Single Zone Variable Air

Volume (SZVAV)

7 Multi-Speed Indoor Fan

Digit 16 - Hinged Service

Access/Filters

0 Standard Panels/Standard Filters

A Hinged Access Panels/Standard

Filters B Standard Panels/2” MERV 8 Filters C Hinged Access Panels/2” MERV 8

Filters D Standard Panels/2” MERV 13 Filters E Hinged Access Panels/2” MERV 13

Filters

Digit 17 - Condenser Coil Protection

0 Standard Coil 1 Standard Coil with Hail Guard 2 Black Epoxy Pre-Coated Condenser

Coil 3 Black Epoxy Pre-Coated

Condenser Coil with Hail Guard

Digit 18 - Through the Base Provisions

0 NoThrough-the-Base Provisions

A Through-the-Base Electric

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

0 No Disconnect/No Circuit Breaker 1 Unit Mounted Non-Fused

Disconnect

2 Unit Mounted Circuit Breaker

Digit 20 - Convenience Outlet

0 No Convenience Outlet

A Unpowered Convenience Outlet

B Powered Convenience Outlet

(three-phase only)

Digit 21 - Communications Options

0 No Communications Interface 1 Trane Communications Interface 2 LonTalk® Communications Interface 6 BACnet™ Communications Interface

Digit 22 - Refrigeration System Option

0 Standard Refrigeration System

Digit 23 - Refrigeration Controls

0 No Refrigeration Control 1 Frostat™

2 Crankcase Heater 3 Frostat and Crankcase Heater

11 ,13

Digit 24 - Smoke Detector

0 No Smoke Detector A Return Air Smoke Detector

B Supply Air Smoke Detector C Supply and Return Air Smoke

Detectors

D Plenum Smoke Detector

Digit 25 - System Monitoring Controls

0 No Monitoring Control 1 Clogged Filter Switch 2 Fan Failure Switch 3 Discharge Air Sensing Tube 4 Clogged Filter Switch and Fan

Fail Switch

5 Clogged Filter Switch and Discharge

Air SensingTube

6 Fan Fail Switch and Discharge Air

SensingTube

7 Clogged Filter and Fan Fail Switches

and Discharge Air Sensing Tube

A Condensate Drain Pan Overflow

Switch

B Clogged Filter Switch and

Condensate Drain Pan Overflow Switch

C Fan Failure Switch and Condensate

Drain Pan Overflow Switch

D Discharge Air Sensing and

Condensate Drain Pan Overflow Switch

E Clogged Filter Switch, Fan Failure

Switch and Condensate Drain Pan

Overflow Switch

F Clogged Filter Switch, Discharge

Air SensingTube and Condensate Drain Pan Overflow Switch

G Fan Failure Switch, Discharge Air

SensingTube and Condensate Drain Pan Overflow Switch

H Clogged Filter Switch, Fan Failure

Switch, Discharge Air Sensing and Condensate Drain Pan Overflow Switch

Digit 26 - System Monitoring Controls

0 No Monitoring Controls A Demand Control Ventilation (CO2)

Digit 27 - Unit Hardware Enhancements

0 No Enhancements 1 Stainless Steel Drain Pan

Digit 31 - Advanced Unit Controls

0 Standard Unit Controls 1 Human Interface

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Model Number Description

Model Number Notes

1. Available on 3-5 ton models.

2. Manual outside air damper will ship factory supplied within the unit, but must be field installed.

3. High pressure control is standard on all units.

4. Multispeed direct drive standard on single-phase products. Belt drive standard on three-phase 37½ ton. Variable speed direct drive standard on 10 ton.

5. Economizer with Barometric Relief is for downflow configured units only. Order Economizer without Barometric Relief for horizontal configuration. Barometric Relief for horizontal configured units mustbe ordered as field installed accessory.

6. Through-the-base electric required when ordering disconnect/circuit breaker options.

7. Requires use of Disconnect or Circuit Breaker.

8. Standard metering devices are

TXVs.

9. The return air smoke detector may not fit up or work properly on the Precedent™ units when used in conjunction with 3rd party accessories such as bolt on heat wheels, economizers and power exhaust. Do not order the return air smoke detectors when using this type of accessory.

10. Requires hinged access panels.

11. Crankcase heaters are only available as option onWSC036E,

WSC048E1, & WSC060E1. CCH

are standard on all other units.

12. Motorized outside air damper is not available on Multi-Speed or SZVAV (Single Zone Variable Air

Volume) products.

13. Frostat standard on Multi-speed and SZVAV (Single Zone Variable

Air Volume) products.

14. Multi-speed indoor fan only available on 10 ton products.

15. Demand Control Ventilation Option includes wiring only.The CO

sensor is a field-installed

only option.

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General Information

Unit Nameplate

A Mylar unit nameplate is located on the unit’s corner support next to the filter access panel. It includes the unit model number, serial number, electrical characteristics, refrigerant charge, as well as other pertinent unit data.

Compressor Nameplate

The nameplate forthe compressors arelocated on theside

of the compressor.

Unit Description

Before shipment, each unit is leak tested, dehydrated, charged with refrigerant and compressor oil, and run tested for proper control operation.

The condenser coils are aluminum fin, mechanically

bonded to copper tubing.

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

The ReliaTel™Control Module is a microelectronic control

system that is referred to as “Refrigeration Module” (RTRM).The acronym RTRM is used extensively throughout this document when referring to the control system network.

These modules through Proportional/Integral control

algorithms perform specific unit functions that governs unit operation in response to; zone temperature, supplyair temperature, and/or humidity conditions depending on the application.The stages of capacity control for these units is 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 interpret information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request for cooling.

Economizer Control Actuator (Optional)

The ECA monitors the mixed air temperature, return air

temperature, minimum position setpoint (local or remote), power exhaust setpoint, CO ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity against ambient humidity) sensors, if selected, to control dampers to an accuracy of +/- 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.

setpoint, CO2, and

RTCI - ReliaTel™ Trane® Communication Interface (Optional)

This module is used when the application calls for an

ICSTM building management type control system. It allows the control and monitoring of the system through an ICS panel.The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installation instruction that ships with each kit when field installation is necessary.

RLCI - ReliaTel™ LonTalk® Communication Interface (Optional)

This module is used when the application calls for an

ICSTM building management type control system that is LonTalk. Itallows the controland monitoring of the system through an ICS panel.The module canbe ordered from the factory or ordered as a kit to be field installed. Follow the installation instruction that ships with each kit when field installation is necessary.

RBCI - ReliaTel™ BACnet™ Communications Interface (Optional)

This module is used whenthe application calls for an open

BACnet protocol. It allows the control and monitoring of the system through an ICS panel.The module can be ordered from the factory or as a kit to be field installed. Follow the installation instructions that ships with each kit when field installation is necessary.

RTOM – ReliaTel™ Options Module

The RTOMmonitors the supply fanproving, clogged filter,

supply air temperature, exhaust fan setpoint, supply air tempering, Frostat™ and smoke detector. Refer to system input devices and functions for operation.

This module is standard on 10 ton products.

System Input Devices & Functions

The RTRM must have a zone sensor or thermostat input in

order to operate the rooftop unit.The flexibility of having several mode capabilities depends upon the type of zone sensor thermostat selected to interface with the RTRM.

The descriptions of the following basic InputDevices used

within the RTRM network are to acquaint the operator with their function as they interface with the various modules. Refer to the unit’s electrical schematic for the specific module connections.

The following controls are available from the factory for

field installation.

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General Information

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 switchconnected to the RTRM (factory set point 0.07 “w.c.) within 40 seconds nominally, the RTRM will shut off all mechanical operations, lock the system out, send a diagnostic to ICS, and the SERVICE output will flash.The system will remain locked out until a reset is initiated either manually or through ICS.

Clogged Filter Switch (Optional)

The unit mounted clogged filter switch monitors the

pressure differential across the return air filters. It is mounted in the filter section and is connected to the RTOM. A diagnostic SERVICE signal is sent to the remote panel if the pressure differential across the filters isat 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 beenclosed for atleast 2 minutes.

The system will continue to operate regardless of the

status of the filter switch.

Note: On units equipped with factory installed MERV 13

filters, a clogged filter switch with different pressure settings will be installed.This switch will close when the differential pressure is approximately 0.8' w.c. and open when the differential falls to 0.7" w.c.

Condensate Drain Pan Overflow Switch (Optional)

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 compressorfor 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

When the LPC is opened for 1 continuous second, the

compressor for that circuit is turned off immediately.The compressor will not be allowed to restart for a minimum of 3 minutes.

If four consecutive open conditions occur during an active call for cooling, the compressor will be locked out, a diagnostic communicated to ICS™, if applicable, and a manual reset required to restart the compressor. On dual compressor units only the affected compressor circuit is locked out.

High Pressure 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.

ReliaTel™ Option

This input incorporates the Condensate Overflow Switch

(COF) mounted on the drain pan and the ReliaTel Options Module (RTOM).When the condensate level reaches the trip point for 6 continuous seconds, the RTOM will shut down all unit functions until the overflow condition has cleared.The unit will return to normal operation after 6 continuous seconds with the COF in a non-tripped condition. If the condensate level causes unit shutdown more than 2 times in a 3 days period, the unit will be locked-out of operation requiring manual reset of diagnostic system through Zone Sensor or Building Automation System (BAS). Cycling unit power will also clear the fault.

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

8 RT-SVX23F-EN

Power Exhaust Control (Optional)

The power exhaust fan is started whenever the position of

the economizer dampers meets or exceed the power exhaust setpoint when the indoor fan is on.

The setpoint panel is located in the return air section and

is factory set at 25%.

Lead/Lag Control (Dual Circuit Only)

Lead/Lag is a selectable input located on the RTRM.The RTRM is configured from the factory with the Lead/Lag control disabled.To activate the Lead/Lag function, simply cut the wire connected to J3-8 at the RTRM. When it is activated, each time the designated lead compressor is shut off due to the load being satisfied, the lead compressor or refrigeration circuit switches. When the RTRM is powered up, i.e. after a power failure, the control will default to the number one circuit compressor.

Zone Sensor Module (ZSM) (BAYSENS107*)

This electronic sensor features three system switch

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

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General Information

Auto). It is a manual changeover control with single setpoint. (Cooling Setpoint Only)

Zone Sensor Module (ZSM) (BAYSENS109*)

This electronic sensorfeatures four systemswitchsettings

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

Programmable Zone Sensor - (BAYSENS119*)

This 7 day programmable sensor features 2, 3or 4periods

for Occupied or Unoccupied programming per day. If the power is interrupted, the program is retained in permanent memory. If power is off for an extended period of time, only the clock and day may have to be reset.

The zone sensorallows selection of2, 3 or 4system modes

(Heat, Cool, Auto, and Off), two fan modes (On and Auto). It has dualtemperature selection with programmable start time capability.

The occupied cooling set point ranges between 45 and 98

degrees Fahrenheit.The heating set point ranges between 43 and 96 degrees Fahrenheit.

A liquid crystal display (LCD) displays zone temperature, temperature set points, day of the week, time, and operational mode symbols.

The Option Menu is used to enable or disable applicable

functions, i.e.; Morning Warm-up, Economizer minimum position override during unoccupied status, Fahrenheit or Centigrade, Supply air tempering, Remote zone temperature sensor, 12/24 hour time display, Smart fan, and Computed recovery.

During an occupied period, anauxiliary relay rated for 1.25 amps @ 30 volts AC with one set of single pole double throw contacts is activated.

Status Inputs (4 Wires Optional).The ZSM can be wired to receive four (4) operating status signals from the RTRM (HEAT, COOL, SYSTEM “ON”, SERVICE). Four (4) wires from the RTRM should be connected to the appropriate terminals (7, 8,9&10)ontheZSM.

Remote Zone Sensor (BAYSENS073*)

This electronic sensor features remote zone sensing and

timed override with override cancellation. It is used with a

Trane Integrated Comfort™ building management

system.

Remote Zone Sensor (BAYSENS074*)

This electronic sensor features single setpoint capability

and timed override with override cancellation. It is used with aTrane Integrated Comfort™ building management system.

Remote Zone Sensor (BAYSENS016*)

This bullet type temperature sensor can be used for;

outside air (ambient) sensing, return air temperature

sensing, supply air temperature sensing, remote temperature sensing (uncovered).Wiring procedures vary according to the particular application and equipment involved. Refer to the unit’s wiring diagrams for proper connections.

Remote Zone Sensor (BAYSENS077*)

This electronic sensor can be used with BAYSENS106*,

108*, 110*, 119* Remote Panels.When this sensor is wired to a BAYSENS119* remote panel, wiring must be 18 AWG 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 isa manual orauto changeover control

with dual setpoint capability. Other features include a timed override function, lockable system settings, and Fahrenheit or Celsius temperature display. Included with the wireless zone sensor will be a receiver that is to be mounted inside the unit, a mounting bracket, and a wire harness.

High Temperature Sensor (BAYFRST001*)

This sensor connects to the RTRM Emergency Stop Input

located on the LTB and provides high limit“shutdown” of the unit and requires a manual reset.The sensor is used to detect high temperatures due to firein the air conditioning or ventilation ducts.The sensor is designed to mount directly to the sheet metal duct. Each kit contains two sensors.The return air duct sensor (X1310004001) is set to open at 135°F.The supply air duct sensor (X1310004002) is set to open at 240°F. The control can be reset after the temperature has been lowered approximately 25°F below the cutout setpoint.

Evaporator Frost Control

This input incorporatesthe Frostat™ control (FOS)located

on 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.

Frostat™ is standard on multi-speed indoor motors and single zone VAV products (SZVAV).

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.

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General Information

Important:

• The supply air smoke detector samples supply air.The

return and plenum air smoke detectors sample return air.The smoke detectors are designed to shut off the unit if smoke is sensed in the supply air stream or return air stream. This function is performed by sampling the airflow entering the unit at the return air opening. Follow the instructions provided below to assure that the airflow through the unit is sufficient for adequate sampling. Failure to follow these instructions will prevent the smoke detectors from performing it's design function.

• Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

• Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

In order for the supply air smoke detector or return air smoke detector to properly sense smoke in the supply air stream or return air stream, the air velocity entering the smoke detector unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will develop an airflow velocity that falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

Human Interface - 5 Inch ColorTouchscreen (Optional)

The 5 inch ColorTouchscreen Human Interface provides an

intuitive user interface to the rooftop unit that speeds up unit commissioning, shortens unit troubleshooting times, and enhances preventative maintenance measures.The human interface includes several features including:

• Data trending capabilities by means of time series graphs

• Historical alarm messages

• Real-time sensor measurements

• On board system setpoints

• USB port that enables the downloading of component runtime information as well as trended historical sensor data

• Customized reports

Phase Monitoring protection

Precedent units with 3-phase power are equipped with phase monitoring protection as standard.These devices protect motors andcompressors against problems caused by phase loss, phase imbalance, and phase reversal indication.

This sensor monitors voltage between the 3 conductors of

the 3 phase power supply.Two LED lights are provided.

The green light indicates that a balanced 3 phase supply

circuit is properly connected.The red light indicates that unit operation has been prevented.There are two conditions that will prevent unit operation.The power supply circuit is not balanced with the proper phase sequence of L1, L2, L3 for the 3 conductors of a 3 phase circuit.The line to line voltage is not between180 volts and 633 volts.

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Unit Clearances

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

WSC036-048E Units

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WSC060-120E Units

Page 12

Unit Clearances

Figure 2. Heat pump - 3-4 ton standard efficiency

Note: All dimensions are in inches/millimeters.

 

Figure 3. Heat pump - 3-4 ton standard efficiency - unit clearance and roof opening

Note: All dimensions are in inches/millimeters.

CLEARANCE 36” (914 MM)

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Page 13

Figure 4. Heat pump - 3-4 ton standard efficiency - roof curb

44 MMMM

1038 MMMM

1053 MMMM

Note: All dimensions are in inches/millimeters.

Unit Clearances

Figure 5. Heat pumps - 5-6 ton standard efficiency

Note: All dimensions are in inches/millimeters.

1038

1053

RT-SVX23F-EN 13

Page 14

Unit Clearances

Figure 6. Heat pump - 7½ ton standard efficiency

Note: All dimensions are in inches/millimeters.

Figure 7. Heat pump - 5-7½ ton - unit clearance and roof opening

Note: All dimensions are in inches/millimeters.

14 RT-SVX23F-EN

Page 15

Figure 8. Heat pump - 5-7½ ton - roof curb

/8”(

)

Note: All dimensions are in inches/millimeters.

Unit Clearances

(356 MM)

Figure 9. Heat pump - 10 ton standard efficiency

Notes:

1. All dimensions are in inches/millimeters.

2. 2" Electrical Connection: Single Point Power When Heat Installed (WSC Models only.)

INDOOR TOP PANEL

OUTDOOR TOP PANEL

UNIT CONTROL WIRE

22MM

DIA HOLE

CONTROL BOX SECTION ACCESS PANEL

EVAPORATOR SECTION ACCESS PANEL

ALTERNATE CONDENSATE DRAIN CONNECTION 3/4-14 NPT DIA.HOLE

(2130 MM)

50 7/8”

1292 MM

27 5/8”

701 MM

47 7/8”

1216 MM

99 11/16”

2” ELECTRICAL CONNECTION (SINGLE POINT POWER WHEN HEAT INSTALLED)

2532 MM

UNIT POWER WIRE 1 3/8” (35MM) DIA. HOLE

RT-SVX23F-EN 15

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

63 3/16”

1605 MM

COMPRESSOR ACCESS PANEL

CONDENSER COIL

Page 16

Unit Clearances

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

Figure 10. Heat pump - 10 ton standard efficiency - unit clearance and roof opening

Notes:

1. All dimensions are in inches/millimeters.

99 11/16”

(2532 MM)

63 3/16”

(1605 MM)

Figure 11. Heat pump - 10 ton standard efficiency - roof curb

Notes:

1. All dimensions are in inches/millimeters.

18 1/2”

14”

356 MM

13/4”

44 MM

56 3/8”

(1432 MM)

34 3/8”

(873 MM)

84 1/2”

(2146 MM)

25 MM

1”

51 MM

(470 MM)

2”

51 MM

65/8”

168 MM

1”

25 MM

34 3/8”

(873 MM)

2”

CLEARANCE36”(914MM) FOR DOWNFLOW

CLEARANCE 18” (457 MM) FOR HORIZONTAL

83 7/8”

(2130 MM)

18 1/2”

(470 MM)

1”

25 MM

80 1/2”

(2045 MM)

60 3/8”

(1534 MM)

59 7/8”

1521 MM

16 RT-SVX23F-EN

Page 17

Pre-Installation

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.

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:

• Avoid breathing fiberglass dust.

• Use a NIOSH approved dust/mist respirator.

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

sleeved, loose-fitting clothing, gloves, and eye protection.Wash clothes separately from other clothing: rinse washer thoroughly.

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

spraying may generate fiber concentrations requiringadditional respiratory protection. Use the appropriate NIOSH approved respiration in these situations.

First Aid Measures:

• Eye Contact - Flush eyes with water to removedust.

If symptoms persist, seek medical attention.

• Skin Contact -Washaffected areas gently with soap

and warm water after handling.

If the job site inspection of the unit reveals damage or material shortages, file a claim with the carrier immediately.Specify the type and extent of the damage on the “bill of lading” before signing.

• Visually inspect the internal components for shipping damage as soon as possible after delivery and before it is stored. Do not walk on the sheet metal base pans.

• If concealed damage is discovered, notify the carrier’s terminal of damage immediately by phone and by mail. Concealed damage must be reported within 15 days.

• Request an immediate joint inspection of the damage by the carrier and the consignee. Do not remove damaged material from the receiving location.Take photos of the damage, if possible.The owner must provide reasonable evidence that the damage did not occur after delivery.

• Notify the appropriate sales representative before installing or repairing a damaged unit.

Storage

Take precautions to prevent condensate from forming

inside the unit’s electrical compartments and motors if:

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

• the unit is set on the roof curb, and temporary heat is provided in the building. Isolate all side panel service entrances and base pan openings (e.g., conduit holes, S/A and R/A openings, and flue openings) from the ambient air until the unit is ready for start-up.

Note: Do not use the unit’s heater for temporary heat

without first completing the start-up procedure detailed under “Starting the Unit”.

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

Page. 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.

Important: 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.

RT-SVX23F-EN 17

Page 18

Installation

WARNING

Heavy Objects!

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.

WARNING

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.

Table 1. Maximum unit & corner weights (lbs) and center of gravity dimensions (in.)

Unit

Tons Model No. Shipping Net A B C D Length Width

3 WSC036E 589 514 177 107 113 117 29 20 4 WSC048E 600 525 181 109 115 119 29 20 5 WSC060E 825 682 228 177 114 163 38 24 6 WSC072E 835 740 235 196 140 168 40 22

7½ WSC090E 902 804 255 217 153 180 41 22

10 WSC120E 1431 1219 355 333 257 274 48 28

(a)Weights are approximate. (b)Corner weights are given for information only.

Maximum Model

Weights

(a)

Corner Weights

(b)

Center of Gravity (in.)

Figure 12. Corner weights Figure 13. Rigging and center-of-gravity data

18 RT-SVX23F-EN

Page 19

Installation

Table 2. Factory installed options (fiops)/accessory net weights (lbs)

WSC036E-048E WSC060E WSC072E-090E WSC120E

Net Weight Net Weight Net Weight Net Weight

Accessory 3-4 Ton 5 Ton 6-7½ Ton 10 Ton

Barometric Relief 7 10 10 10 Belt Drive Option (3 phase only) 31 31 — — Coil Guards 12 20 20 30 Economizer 26 36 36 36 Electric Heaters Hinged Doors 10 12 12 12 Manual Outside Air Damper 16 26 26 26 Motorized Outside Air Damper 20 30 30 30 Oversized Motor 5 8 8 — Powered Convenience Outlet 38 38 38 50 Powered Exhaust — 80 80 80 Roof Curb 61 78 78 89 Smoke Detector, Supply 5 5 5 5 Smoke Detector, Return 7 7 7 7 Through-the-Base Electrical 8 13 8 13 Unit Mounted Circuit Breaker 5 5 5 5 Unit Mounted Disconnect 5 5 5 5

(a)Weights for options not listed are <5 lbs. (b)Net weight should be added to unit weight when ordering factory-installed accessories. (c) Applicable to Heat Pump units only.

(c)

15 30 30 40

(a),(b)

Foundation

If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at each support location with a“full perimeter” support structure or a slab foundation for support. Refer to Table 1, p. 18for 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.

WARNING

Risk of Roof Collapsing!

Confirm with a structural engineer that the roof structure is strong enough to support the combined weight of the roof curb and the unit. Refer to Table 1,

p. 18 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.

For rooftop applications, ensure the roof is strong enough to support the combined unit and support structural weight. If anchoring is required, anchor the unitto theroof with hold-down bolts or isolators. Check with a roofing contractor for proper waterproofing.

Ductwork

Figure 14, p. 20 to Figure 19, p. 21 illustratethe supply and

return air openings as viewed form the rear of the unit.

Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and to reduce static pressure.

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

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

All outdoor ductwork between the unit and the structure

should be weather proofed after installation is completed.

RT-SVX23F-EN 19

Page 20

Installation

Horizontal Units

Figure 14. Heat pump - 3-4 ton standard efficiency -

horizontal airflow supply/return

Note: All dimensions are in inches/millimeters.

Figure 15. Heat pumps - 5-7½ ton - horizontal airflow

supply and return

Note: All dimensions are in inches/millimeters.

Return

Supply

Figure 16. Heat pump - 10 ton standard efficiency -

horizontal airflow supply/return

Note: All dimensions are in inches/millimeters.

9 3/8”

238 MM

Return

16 3/4”

425 MM

27 5/8” 701 MM

4 1/4”

108 MM

32 1/4” 832 MM

Supply

19 1/4”

489 MM

3/4-14 NPT DIA. HOLE CONDENSATE DRAIN

Downflow Units

Figure 17. Heat pump - 3-4 ton standard efficiency -

downflow airflow supply/return - throughthe-base utilities

Note: All dimensions are in inches/millimeters.

3 5/8”

92 MM

102 MM

610 MM

24”

4”

RETURN

14”

356 MM

9 1/4”

235 MM

15 1/2”

394 MM

16”

406 MM

SUPPLY

32 1/4”

832 MM

3 7/8” 98 MM

4 3/4”

120 MM

4 3/16”

106 MM

TBU CONDENSATE

23 1/2”

597 MM

THROUGH

THE BASE

ELECTRICAL

4 7/8”

124 MM

5 1/16”

128 MM

9 15/16” 253 MM

2 13/16”

71 MM

3 11/16”

94 MM

6 1/2”

165 MM

20 RT-SVX23F-EN

Page 21

Installation

838

Figure 18. Heat pumps - 5-7½ ton - downflow airflow

supply/return - through-the-base utilities

Note: All dimensions are in inches/millimeters.

Figure 19. Heat pump - 10 ton standard efficiency -

downflow airflow supply/return throughthe-base utilities

Note: All dimensions are in inches/millimeters.

3 5/8”

4”

102 MM

92 MM

32 1/8”

816 MM

17 1/2”

444 MM

Return

9 7/8”

251 MM

Supply

17 1/2”

444 MM

33”

WARNING

Combustible Materials!

Maintain proper clearance between the unit heat exchanger, vent surfaces and combustible materials. Refer to unit nameplate and installation instructions for proper clearances. Improper clearances could result in combustible materials catching on fire. Failure to maintain proper clearances could result in death or serious injury or property damage.

5. Verify that appropriate materials were used in the construction of roof and ductwork. Combustible materials should not be used in the construction of ductwork or roof curb that is in close proximity to heater elements or any hot surface. Any combustible material on the inside of the unit base should be removed and replaced with appropriate material.

Figure 20. View for base to roof curb alignment

WSC120E on 50 x 84 roof curb

THROUGH THE

BASE ELECTRICAL

4 1/8”

104 MM

27 5/8”

701 MM

THROUGH THE

BASE CONDENSATE

5 7/8”

149 MM

42 3/16”

1072 MM

2 3/4” 71 MM

Roof Curb

The roof curbs for these units consists of a "full perimeter"

enclosure to support the unit just inside of the unit base rail.The 7½ - 10 ton high efficiency units contain a support base alignment rail and willextend past the end of the roof curb as shown in figures below.

Before installing any roof curb, verify;

1. It is the correct curb for the unit,

2. The necessary gaskets and hardware are included,

3. The purposed installation location provides the required clearance for proper operation.

4. Insure that the curb islevel and square.The top surface of the curbmust be true to assure an adequate curb-tounit seal.

Base Alignment Bracket

6 3/8”

163 MM

Figure 21. View for base to roof curb alignment

WSC120E on 60 x 84 roof curb

RT-SVX23F-EN 21

Page 22

Installation

Table 3. Clearance required from duct to combustible

surfaces

Model Number

WSC036E 0 WSC048E 0 WSC060E 0 WSC072E 1 WSC090E 1 WSC120E 1

Clearance required from duct to

combustible surfaces (inches)

Step-by-step curb assembly and installation instructions ship with each accessory roof curb kit. Follow the instructions carefully to assure proper fit-up whenthe unit is set into place.

Note: To assure proper condensate flow during

operation, as well as proper operation of the condensate overflow switch (if equipped), the unit and curb must be level.

If the unit is elevated, a field constructed catwalk around the unit is strongly recommended to provide easy access for unit maintenance and service.

Recommendations for installing the Supply Air and Return Air ductwork joining the roof curb are included in the curb instruction booklet. Curb ductwork must be fabricated and installed by the installing contractor before the unit is set into place.

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

roof deck for the ductwork penetrations. Do not cut out the entire roof deck within the curb perimeter.

If a Curb Accessory Kit is not used:

a. The ductwork can be attached directly to the

factory-provided flanges around the unit’s supply and return air openings. Besure to useflexible duct connections at the unit.

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

must be installed around the curb perimeter flange and the supply and return air opening flanges.

Rigging

A Rigging illustration and Center-of-Gravity dimensional data table is shown in Figure 13, p. 18. Refer to the typical unit operating weights table before proceeding.

1. Remove all drill screws fastening wood protection to metal baserail. Remove all screws securing wooden protection to wooden top crate.

On 7½-10 ton high efficiency units, remove wire ties from outdoor grill.

2. Remove wooden top crate.

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

3. Rig the unit as shown in Figure 13, p. 18. Attach adequate strength lifting slings to all four lifting brackets in the unit baserail. Do not usecables, chains, or slings except as shown.

4. Install a lifting bar, as shown in Figure 13, p. 18,to protect the unit and to facilitate a uniform lift.The minimum distance between the lifting hook and the top of the unit should be 7 feet.

5. Test-lift the unit to ensure it is properly rigged and balanced, make any necessary rigging adjustments.

6. Lift the unit enough to allow the removal of base fork pocket protection components as shown in the following figures.

7. When 10ton units areinstalled on smaller existingroof curb (50"x84") for replacement applications, do not remove alignment bracket.This bracket helps assure proper alignment of duct openings.

22 RT-SVX23F-EN

Page 23

Installation

Figure 22. Fork lift pockets (all heat pump units except

WSC120)

Figure 23. Fork lift pockets (WSC120)

• Assembleand 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.

• Rig the unit.

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

• Ensure unit-to-curb seal istight and without buckles or cracks.

• Install and connect a condensate drain line to the evaporator drain connection.

Note: Condensate Overflow Switch (if equipped) will not

work if unit is not level or slightly sloped toward switch.

Factory Installed Economizer

• Ensure the economizer has been pulled out into the operating position. Refer to the economizer installers guide for proper position and setup.

• Install all access panels.

Temperature Limit Switch Usage for

Electric Heat Units

NOTICE

8. 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.

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 isrequired in theinstallation process. Itdoes 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 unit nameplate.

• Verify that the installation location of the unit will provide the required clearance for proper operation.

Units are factory shipped in the downflow discharge configuration but can be field converted to a horizontal discharge configuration. Some, but not all units require a differentTCO-A limit switch, which is wire tied near the terminal block in the heater compartment if horizontal discharge configuration is used. See Figure 29, p. 25 for the location ofTCO-A.

Horizontal Discharge Conversion

WSC036E, WSC048E (3 - 4Ton Units)

Note: 3 - 4 ton units supply cover to supply opening and

return cover to return opening.

• Supplies Needed by Installer for Conversion: 3 oz. tube of HighTemperature RTV sealant. (500°F/260°C: Similar to Dow Corning 736)

Important: Failure to use recommended sealant could

result in unit performance loss.

If a unit is to be converted to a horizontal discharge, the following conversion must be performed:

1. Remove RETURN and SUPPLY duct covers.

2. Locate supply cover. Apply ¼ in. (6mm.) continuous bead of 500°F RTV sealant to the flange as shown in

Figure 24, p. 24.

RT-SVX23F-EN 23

Page 24

Installation

Figure 24. Supply duct cover

RTV Sealant

3. Position SUPPLY DUCT COVER as shown, rotate 90 degrees to allow entrance into supply opening.

4. Slide SUPPLY DUCT COVER into duct openings until inward edge ofduct cover engages with the 2 retaining clips on the duct flanges. Secure the outward edge of each duct cover with 2 screws.

Figure 25. Supply & return openings

If a unit is to be converted to a Horizontal discharge, the following conversion must be performed:

1. Remove RETURN and SUPPLY duct covers.

2. Place SUPPLY DUCT COVER over downflow return opening. (insulation side down)

3. Using self-drilling screws, (or screws removed from duct cover), screw through dimples to attach Duct Cover to base.

Figure 26. Supply duct cover

Supply Duct Cover

Screw into 4 dimples on top edge

4. On original RETURN DUCT COVER, apply ¼” (6mm.) continuous bead of 500°F RTV sealant around flange (opposite insulation side), as shown.

Figure 27. Return duct cover

Supply duct cover with RTV installed

5. Slide RETURN DUCT COVER (insulation side up) into supply opening until inward edge of duct cover engages with the 2 retaining clips on the duct flange. Secure out-ward edge of the duct cover with two screws.

Note: Certain unit/electric heater combinations require a

limit switch change out for horizontal airflow applications. Refer to the following instructions to determine if this process is required for the unit undergoing installation.

6. After completing installation of the duct covers for horizontal discharge, proceed toTCO-1 instructions.

Horizontal Discharge Conversion WSC060120E (5 - 10Ton Units)

Note: 5 - 10 ton units supply cover to return opening and

return cover to supply opening.

• Supplies needed by installer for conversion: 3 oz. tube of highTemperature RTV sealant. (500°F/260°C: Similar to Dow Corning 736)

Important: Failure to use recommended sealant could

result in unit performance loss.

RTV Sealant

5. Slide RETURN DUCT COVER (insulation side up) into supply opening until inward edge of duct cover engages with the 2 retaining clips on the duct flange. Secure outward edge of the duct cover with two screws.

Figure 28. Supply & return openings

Supply duct cover

Insulation side down

Insulation side up

Return duct cover

24 RT-SVX23F-EN

Page 25

Installation

Note: If unit is equipped with Return Air Smoke Detector,

refer to field conversion instructions for horizontal discharge before installing return air duct.

Note: Certain unit/electric heater combinations require a

limit switch change out for horizontal airflow applications. Refer to the following instructions to determine if this process is required for the unit undergoing installation.

6. After completing installation of the duct covers for horizontal discharge, proceed toTCO-A instructions.

TCO-A Instructions

If the unit being installed is listed in the following table and is equipped with the corresponding model number of factory installed electric heater package in the table, the limit controlTCO-A must be replaced with the extra limit control shipped in the heater compartment. ReplaceTCOA following the instructions in steps 1 through 3 below. If the unit being installed does not have a factory installed electric heater package or is equipped with a factory installed electric heater model thatdoes not correspondto any in this table, skip steps 1 through 3 and go on to next step in the installation process.

Table 4. TCO-A replaced for horizontal duct

configuration

Figure 29. TCO-A location

Unit Model Number

WSC120EW BAYHTRBW36, W54 Right

WSC090E4 BAYHTRU427, 436 Center

WSC090EW BAYHTRUW27, W36 Center

WSC072E3 BAYHTRW327, 336 Center WSC072E4 BAYHTRW427, 436 Center

WSC072EW BAYHTRWW27, W36 Center

Electric Heater Model

Number

TCO-A

location

1. Remove the heater section access panel and open the electric heater dead front panel.

2. TCO-A is the limit control located in the central or right part of the heater mounting plate and that is located on the bottom of the two heater element assemblies. See

Figure 29, p. 25.To replace this device, first remove the

two wires connected to the terminals. Next, remove the two screws which secure it to the heater element mounting plate. OnceTCO-A has been removed from the heater element mounting plate, discard this device.

3. Obtain the replacement TCO-A which is secured by a wire tie near the electric heater terminal block in the heater compartment. Attach it to the heater element mounting plate with the twoscrews thatwere removed in step 2 above. Connect the two wires that were unhooked in step 2 to the terminals on the newTCO-A. Refer to the heater package wiring diagram to assure that the wiring is connected properly.

4. Close the electric heater dead front panel and replace heat section access panel.

Return Air Smoke Detector

The factory installed Return Air Smoke Detector is

installed in the Downflow discharge position. No additional field setup is required.

If a unit is to be converted to Horizontal discharge, the following conversion must be performed:

1. If the unit has an economizer, it must be pulled out in the operating position.

2. Remove the 3 screws from the mounting brackets. Refer to Downflow View for screw locations.

RT-SVX23F-EN 25

Page 26

Installation

Figure 30. Downflow view

3. Lift the tube and bracket from the downflow duct opening. Rotate the tube and bracket assembly 180° degrees ensuring that the holes on the copper sensing tube face away from the unit and face the return air ductwork. Refer to Horizontal View.

Note: Check to insure that the flexible tubing lies flat on

the base pan surface.

4. Slide the top bracket down the copper sensing tube, insert the tab on the left side into the slot on the indoor coil blockoff and secure the right side of the bracket with one of the 3 screws removed in step 2. Refer to Horizontal View.

5. Using the remaining 2 screws removed in step 2, secure the bottom bracket. Refer to Horizontal View

Figure 31. Horizontal view

Main Electrical Power Requirements

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

WARNING

Proper FieldWiring and Grounding Required!

All field wiring MUST be performed by qualified

• 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 themain power terminal block (HTB1) in the unit control panel.

• Install proper grounding wires to an earth ground.

Note: All field-installed wiring must comply with NEC

and applicable local codes.

Electric Heat Requirements

• Verify that the power supply complies with the electric heater specifications on the unit and heater nameplate.

• Inspect the heater junction box and control panel; tighten any loose connections.

• Check electric heat circuits for continuity.

26 RT-SVX23F-EN

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.

Page 27

Installation

Condensate Drain Configuration

WARNING

Hazardous Voltage!

An evaporator condensate drain connection is provided on each unit. Refer to Figure 14, p. 20 - Figure 19, p. 21 for the appropriate drain location.

The condensate drain pan is factory installed to drain

condensate to thebackside of theunit. See Figure 14, p. 20

- Figure 19, p. 21. It can be converted to drain condensate out the front side of the unit or through the base.

To Convert Drain Condensate Out the Front of

Unit:

1. Remove evaporator accesspanel and supply air access panels.

2. Remove the support panel that the condensate drain pan exits through.

3. Slide the condensate drain pan out of the unit and rotate 180°.

4. Slide the condensate drain pan back into the unit,align the drain with the grommeted opening in the rear support panel and push until the coupling is seated in the grommet.

5. Replace the front support panel by aligning the panel with tabs in the raceway. Align the condensate drain pan support in the grommeted hole as the panel is put in place.

6. Replace evaporator access panel and supply air access panels.

To Convert Drain CondensateThrough-the-

Base of Unit:

1. Remove evaporator accesspanel and supply air access panels.

2. Remove the support panel that the condensate drain pan exits through.

3. Slide the condensate drain pan out of the unit.

4. Place on a level surface in the position it was removed from the unit.

5. Remove the plug knockout in the bottom of the drainpan to convert it to through the base drainage.

6. Plug theoriginal condensate drain opening with a field supplied 3/4” NPT plug.

7. Slide the condensate drain panback into theunit, align the drain support with the grommeted opening in the

rear support panel and push until the supportis seated in the grommet.

8. Replace the front support panel by aligning the panel with tabs in the raceway.Align the plugged condensate drain pan coupling in the grommetedhole as the panel is put in place.

9. Replace evaporator access panel and supply air access panels.

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 32,

p. 27.

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 32. Condensate trap installation

38.1

Drain Pan Removal (Units with Condensate Overflow Switch Option)

Before drain pan removal, the switch wire must be disconnected from wire tie on panel and/or any tape before drain pan can be removed.

Care must be taken so the wire does not catch on the bottom of indoor coil or any protrusion.

Note: When reversing the drain pan, on some units, the

condensate overflow switch will need to be moved to the second hole in its bracket to avoid contact with headers or indoor coil.

Filter Installation

The quantity of filters is determined by unit size. Access to

the filters is obtained by removing the filter access panel.

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

Note: Do not operate the unit without filters.

RT-SVX23F-EN 27

Page 28

Installation

Field Installed Power Wiring

WARNING

Proper FieldWiring and Grounding Required!

All field wiring MUST be performed by qualified

An overall dimensional layout forthe fieldinstalled wiring entrance into the unit is illustrated in “Unit Clearances,”

p. 11. To insure that the unit’s supply power wiring is

properly sized and installed, follow theguidelines outlined below.

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:

disconnect switch (UDC) or circuit breaker (UCB) was factory mounted, field wiring connections should be terminated in thecontrol box at CompressorContactor # 1 (CC1).

2. Provide proper grounding for the unit in accordance with local and national codes.

Note: Black Gasket is shipped from the factory and is

located in the literature ship with bag in the control box.Apply Black Gasket around conduit plate on all 4 sides after installation to prevent air leakage from the building entering the electrical enclosures.

Note: Seal between wiring and conduit with Black Gasket

or weather proof sealer to prevent air leakage from the building entering the electrical enclosures. Also seal around conduit and wiring at all roof and curb penetrations.

Figure 33. All units except WSC120E

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.

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

installed nonfused disconnect switch or circuit breaker, a field supplied disconnect switch must be installed at or near the unit in accordance with the National Electrical Code (NEC latest edition).

Main Unit Power StandardWiring

1. Location ofthe applicable electricalservice entrance is illustrated in “Unit Clearances,” p. 11. Complete the unit’s power wiring connections at Compressor Contactor # 1 (CC1) inside the unit control panel. Refer to the customer connection diagram that is shipped with the unit for specific termination points.

2. Provide proper grounding for the unit in accordance with local and national codes.

Main Unit Power OptionalTBUE Wiring (Through-the-Base Electrical Option)

1. Location of the applicable electrical service is illustrated below. Refer to the customer connection diagram that is shipped with the unit for specific termination points.The termination points, depending on the customer option selected would be a factory mounted nonfused disconnect switch (UDC) or circuit breaker (UCB). If neither a factory mounted nonfused

Figure 34. WSC120E

SEAL BETWEEN WIRING AND CONDUIT WITH WEATHER PROOF SEALER TO PREVENT AIR LEAKAGE

CONTROL WIRING CONDUIT

BLACK GASKET

FIELD POWERED CONVENIENCE OUTLET CONDUIT

CONTROL WIRING CONDUIT

28 RT-SVX23F-EN

Page 29

Installation

Field Installed Control Wiring

WARNING

Hazardous Voltage!

WARNING

Proper FieldWiring and Grounding Required!

All field wiring MUST be performed by qualified

An overall layout of the various control options available with the required number of conductors for each control device is illustrated in Figure 42, p. 34.

Control PowerTransformer

The 24 voltcontrol power transformers are tobe used only

with the accessories called out in this manual.

Transformers rated greater than 50VA are equipped with

internal circuit breakers. If acircuit breaker trips, turn “Off” all power to the unit before attempting to reset it.

The transformer is located in the control panel.The circuit

breaker is located on the left side of the transformer and can be reset by pressing in on the black reset button.

Controls Using 24 VAC

Before installing any connecting wiring, refer to“Unit

Clearances,” p. 11 for the electrical access locations

provided on the unit and Table 5, p. 29 for AC conductor sizing guidelines, and;

a. Use copper conductors unless otherwise specified.

b. 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.

NOTICE:

Controls Using 24 VAC!

Resistance in excess of 3 ohms per conductor could cause component failure due to insufficient AC voltage supply.

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

conduit with the high voltage power wiring.

e. Route low voltage wiring per illustrations on

Figure 37, p. 30.

Table 5. AC conductors

Distance from Unit to Control Recommended Wire Size

000 - 460 feet

000 - 140 m

461 - 732 feet

141 - 223 m

733 - 1000 feet

224 - 305 m

18 gauge

.75 mm

16 gauge

1.3 mm

14 gauge

2.0 mm

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 Clearances,” p. 11 for the electrical access locations provided on the unit.

1. Table 6, p. 29 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.

4. Route lowvoltage wiring per illustrations on Figure 37,

p. 30.

Table 6. DC conductors

Distance from Unit to

Control Recommended Wire Size

0 - 150 feet 0 - 45.7 m

151 - 240 feet 46 - 73.1 m

241 -385 feet

73.5 - 117.3 m 386 - 610 feet

117.7 - 185.9 m 611 - 970 feet

186.2 - 295.7 m

22 gauge .33 mm

20 gauge .50 mm

18 gauge .75 mm

16 gauge

1.3 mm 14 gauge

2.0 mm

c. Be sure to check all loads and conductors for

grounds, shorts, and mis-wiring.

RT-SVX23F-EN 29

Page 30

Installation

Figure 35. ReliaTel™ conventional thermostat field

Figure 36. ReliaTel™ refrigeration module

wiring diagram

RTRM

Figure 37. Customer control low voltage routing (all units except 10 ton)

30 RT-SVX23F-EN

Page 31

Figure 38. ReliaTel™ (without TBUE) control customer wire routing (10 ton)

Installation

Figure 39. ReliaTel™ (with TBUE) control customer wire routing (10 ton)

RT-SVX23F-EN 31

Page 32

Installation

Smoke Detector - (ReliaTel™ Only) Customer Low Voltage Wiring

When interlocking System Sensor smoke detectors

together, all of the detectors must be powered from the same power supply. If multiple smoke detectors are required, all detectors must be disconnected from the HVAC unit power supply and connected together from another single source supply.

Important: Do not interconnect smoke detectors

together that have separate power supplies. Do not exceed ten smoke detectors on one power supply.

Figure 40. Smoke detector field wiring examples

5 or fewer HVAC units

Note: Multiple System Sensor smoke detectors are

connected together using terminals 1 and 12 on each detector.

If you have supply and return smoke detectors in all HVAC units, you can connect a maximum of 5 HVAC units (10 detectors) up to one power supply. See the following field wiring example below.

If you havemore than 5 HVAC units, you can connectall the supplies together on one power supply (up to 10 HVAC units), and all the returns together (up to 10HVACunits) on another power supply. See the following field wiring example below.

More than 5 HVAC units

32 RT-SVX23F-EN

Page 33

Pre-Start

Space Temperature Averaging (ReliaTel™ only)

Space temperature averaging is accomplished by wiringa number of remote sensors in a series/parallel circuit.

Using the BAYSENS016* or BAYSENS077*, at least four sensors are required to accomplish space temperature averaging. Example #1 illustrates two series circuits with

Figure 41. Examples

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 BAYSENS077*, two sensors are required to accomplish space temperature averaging. Example #3 illustrates the circuit required for this sensor. Table 7, p. 35 lists the temperature versus resistance coefficient for all sensors.

RT-SVX23F-EN 33

Page 34

Pre-Start

Figure 42. Typical field wiring diagrams for optional controls

BAYSENS075*

BAYSENS106*

BAYSENS073* BAYSENS074*

BAYSENS108*

BAYSENS075*

BAYSENS119*

BAYSENS075* ASYSTAT669A OPTIONAL REMOTE SENSOR

BAYSENS110*

34 RT-SVX23F-EN

Page 35

Pre-Start

Table 7. Temperature versus resistance (temperature

vs. resistance is negative)

Temperature

Degrees F° Degrees C° Nominal Resistance

-20° -28.9° 170.1 K - Ohms

-15° -26.1° 143.5 K - Ohms

-10° -23.3° 121.4 K - Ohms

-5° -20.6° 103.0 K - Ohms 0° -17.8° 87.56 K - Ohms 5° -15.0° 74.65 K - Ohms

10° -12.2° 63.80 K - Ohms 15° -9.4° 54.66 K - Ohms 20° -6.7° 46.94 K - Ohms 25° -3.8° 40.40 K - Ohms 30° -1.1° 34.85 K - Ohms 35° 1.7° 30.18 K - Ohms 40° 4.4° 26.22 K - Ohms 45° 7.2° 22.85 K - Ohms 50° 10.0° 19.96 K - Ohms 55° 12.8° 17.47 K - Ohms 60° 15.6° 15.33 K - Ohms 65° 18.3° 13.49 K - Ohms 70° 21.1° 11.89 K - Ohms 75° 23.9° 10.50 K - Ohms 80° 26.7° 9.297 K - Ohms 85° 29.4° 8.247 K - Ohms 90° 32.2° 7.330 K - Ohms 95° 35.0° 6.528 K - Ohms

100° 37.8° 5.824 K - Ohms

Use the checklist provided below in conjunction with the “General Unit Requirements” checklist to ensure that the unit is properly installed and ready for operation.

WARNING

Hazardous Voltage!

• Check all electrical connections for tightness and “point of termination” accuracy.

• Verify that the condenser airflow will be unobstructed.

• Verify that the condenser fan and indoor blower turn

freely without rubbing and are properly tightened on the shafts.

• Check the supply fan belts for proper tension and the

fan bearings for sufficient lubrication. If the belts require adjustment, or if the bearings need lubricating,

refer to the maintenance section of this manual for instructions.

• Verify that a condensate trap is installed and the piping is properly sized and pitched.

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

• Inspect the interior of the unit for tools and debris and install all panels in preparation for starting the unit.

Voltage Imbalance

Three phase electrical power to the unit must meet

stringent requirements for the unit to operate properly. Measure each leg (phase-to-phase) of the power supply. Eachreading must fall within theutilization range stamped on the unit nameplate. If any of the readings do not fall within the proper tolerances, notify the power company to correct this situation before operating the unit.

Excessive three phase voltage imbalance between phases will cause motors to overheat and eventually fail.The maximum allowable voltage imbalance is 2%. Measure and record the voltage between phases 1, 2, and 3 and calculate the amount of imbalance as follows:

% Voltage Imbalance =

AV (Average Voltage) =

V1, V2, V3 = Line Voltage Readings

VD = Line Voltage reading that deviates the farthest from

the average voltage.

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

221 + 230 + 227

VD (reading farthest from average) = 221

The percentage of Imbalance equals:

100 X 226 - 221

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.

100 X AV - VD

Volt 1 + Volt 2 + Volt 3

= 226 Avg.

= 2.2%

where;

RT-SVX23F-EN 35

Page 36

Pre-Start

Electrical Phasing (Three Phase Motors)

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

internally connected for the proper rotation when the incoming power supply is phased as A, B, C.

Proper electrical supply phasing can be quickly determined and correctedbefore starting theunit by using an instrument such as an Associated Research Model 45 Phase Sequence Indicator and following the steps below:

WARNING

Hazardous Voltage!

• Turn the field supplied disconnectswitch that provides power to the main power terminal block or to the

“Line” side of the optional factory mounted disconnect

switch to the “Off” position.

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

Black (phase A) to L1

Red (phase B) to L2

Yellow (phase C) to L3

• Close the field supplied main power disconnect switch or circuit protector switch that provides the supply power to the unit.

• Observe the ABC and CBAphase indicator lightson the face of the sequencer.The ABC indicator lightwill glow if the phase is ABC. If the CBA indicator light glows, open the disconnect switch or circuit protection switch and reverse any two power wires.

• Restore the main electrical power and recheck the phasing. If the phasing is correct, open the disconnect switch or circuit protection switch and remove the phase sequence indicator.

Compressor Crankcase Heaters (Optional on WSC036E*, WSC048E1, and WSC060E1

- Standard on Remaining Units)

Each compressor can be equipped with a crankcase heater.The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the “Off” cycle to reduce oil foaming during compressor starts. Oil foaming occurs when refrigerant condenses in the compressor and mixes with the oil. In lower ambient conditions, refrigerant migration to the compressor could increase.

When the compressor starts, the sudden reduction in

crankcase pressure causes the liquid refrigerant to boil rapidly causing the oil to foam.This condition could damage compressor bearings due to reduced lubrication and could cause compressor mechanical failures.

Before starting the unit in the “Cooling” mode, set the system switch to the “Off” position and turn the main power disconnect to the “On” position and allow the crankcase heater to operate a minimum of 8 hours.

Before closing the main power disconnect switch, insure that the “System” selection switch is in the“Off” position and the “Fan” selection switch is in the “Auto” position.

Close the main power disconnect switch and the unit mounted disconnect switch, if applicable.

ReliaTel™ Controls

Upon power initialization, the RTRM performs 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 acrossthe“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 disconnectswitch. Once the test mode has been terminated, the Liteport LED will glow continuously and the unit will revert to the

“System” control.

36 RT-SVX23F-EN

Page 37

Test Modes

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

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

• StepTest 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.

• ResistanceTest Mode - This method can be used for start-up providing a decade box for variableresistance outputs is available.This method initiates the different components of the unit, one at a time, when a specific resistance value is placed across the two test terminals.The unit willremain in the specific test mode for approximately one hour even though the resistance is left on the test terminals.

• AutoTest 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 8, p. 38.

Pre-Start

RT-SVX23F-EN 37

Page 38

Start-Up

Table 8. Service test guide for component operation

Test Step Mode Fan Econ

Fan On

Minimum

Ventilation

3 Cool Stage 1 On

(c)

(a)The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint. (b)The condenser fans will operate any time a compressor is “On” providing the outdoor air temperatures are within the operating values. (c) Steps for optional accessories and non-applicable modes in unit will be skipped.

Economizer T est

Open

Cool Stage 2 On

Reheat On Minimum On On Off Off 33K High Heat Stage 1 On Minimum Off Off On Off 10K High Heat Stage 2 On Minimum Off Off On On 15K High

On Selectable Off Off Off Off

On Open Off Off Off Off 3.3K Low

(a)

Minimum

Position

Setpoint 0%

Minimum

Position

Minimum

Position

Comp1 Comp 2 Heat 1 Heat 2 Ohms

Off Off Off Off

2.2K Low

(b)

Off Off Off 4.7K Low

On Off Off 6.8K

Multi-Speed Fan

High (2-step cooling)

Low (2-step cooling)

Output

Verifying Proper Air Flow

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

Units with 5-Tap Direct Drive Indoor Fan

The indoor fan motors arespecifically designed tooperate

within the BHP parameters listed in the fan performance tables of the unit Service Facts.

When verifying direct drive fan performance, the tables

must be used somewhat differently than those of belt driven fans. Fan performance diagnostics can be easily recognized when these tables are used correctly.

Before starting the SERVICETEST, set the minimum position setpoint for the economizer to 0 percent usingthe setpoint potentiometer locatedon the Economizer Control (ECA), if applicable.

ReliaTel™ Control

Using the ServiceTest Guide in Table 8, p. 38, momentarily jump across theTest 1 &Test 2 terminals on LTB1 one time to start the Minimum VentilationTest.

With the fan operating properly, determine the total

system external static pressure (inches w.c.) by the following method:

1. Measure the supply andreturn duct static pressure and sum the resulting absolute values.

2. Use the accessory pressure drop table in the Service Facts, to calculate the total static pressure drop for all of the accessories installed on the unit; i.e., curb, economizer, etc.

Note: Accessory static pressure drop is based on desired

CFM and may not be actual static pressure drop.

3. Add the total accessory static pressuredrop (Step 2)to the duct external static pressure (Step 1).The sum of these two values represents the total system external static pressure.

Using the Fan PerformanceTables in the Service Facts, look up the selected speed tap setting and match the measured ESP to determine the approximate CFM.

If the required CFM is too low, (external static pressure is high) do one or both of the following and repeat procedure:

• Relieve supply and/or return duct static.

• Change indoor fan speed tap to a higher value

If the required CFM is too high, (external static pressure is low), do one or both of the following and repeat procedure:

• Increase supply and/or return duct static.

38 RT-SVX23F-EN

Page 39

Start-Up

• Change indoor fan speed tap to a lower value.

Note: Minimum setting for units with Electric Heat is 320

CFM perTon.

To stop the SERVICETEST, turn the mainpower disconnect

switch to the "Off" position or proceed to the next component start-up procedure.

Units with Belt Drive Indoor Fan

The indoor fan speed is changed by openingor closing the

adjustable motor sheave.

Before starting the SERVICETEST, set the minimum position setpoint for the economizer to 0 percent usingthe setpoint potentiometer locatedon the Economizer Control (ECA), if applicable.

ReliaTel™ Control

Using the ServiceTest Guide in Table 8, p. 38, momentarily jump across theTest 1 &Test 2 terminals on LTB1 one time to start the Minimum VentilationTest.

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

The direction ofrotation 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 theamperage at the supply fan contactor and compare it with the fullload amp(FLA) rating stamped on the motor nameplate.

a. Calculate the theoretical BHP using (Actual Motor

Amps/Motor Nameplate Amps) X Motor HP.

b. Using the fan performance table in the unit Service

Fact, 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 staticpressure 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 Step 1 and

Step 2.

• ToIncrease 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 Step

1 and Step 2.

• To stop the SERVICETEST, turn the main power disconnect switch to the "Off" position or proceed to the next component start-up procedure.

ReliaTel™ Units with Direct Drive Indoor Fan (7.5 - 10 Ton Units)

Much of the systems performance and reliabilityis closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.Theindoor fan speed is changed by adjusting the voltage from the RTOM Indoor Fan Speed output to the direct drive plenum fan. If installed, before starting the SERVICETEST disable the Economizer by disconnecting the 4 pin power connector located at the base of the Economizer Control (ECA).

Using the ServiceTest Guide in Table 8, p. 38, momentarily jump across theTest 1 &Test 2 terminals on LTB1. Repeat process until ServiceTest Mode is at Cool 2 (2-Steps of Cooling Applications Only) or Cool 3 (3-Steps of Cooling applications).The indoor motor shall be operating @ 100%, to verify turn DA COOL_FAN SPD potentiometer full clockwise, voltage should read ~7.5 Vdc across harness test terminals.The unit schematic illustrates location for measuring the indoor motor speed voltage.

Table 9. RPM table

Potentiometer

Voltage Motor RPM

1.25 217 4.50 1061

1.50 312 4.75 1126

1.75 362 5.00 1191

2.00 427 5.25 1253

2.25 479 5.50 1315

2.50 543 5.75 1374

2.75 605 6.00 1432

3.00 668 6.25 1487

3.25 732 6.50 1539

3.50 797 6.75 1588

3.75 863 7.00 1633

4.00 929 7.25 1675

4.25 995 7.50 1700

Note: Factory setting is 5V

Once the supply fan has started, determine the total system airflow (CFM)

1. Measure the DC voltage across harness test terminals. Using the fan rpm table shown above, determine RPM correlated to measured voltage.

2. If the required CFM is too low, (external staticpressure 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 Step 1 and

Step 2.

Potentiometer

Voltage Motor RPM

RT-SVX23F-EN 39

Page 40

Start-Up

• To Increase/Decrease Fan RPM turn DA COOL_FAN SPD on the RTOM clockwise/counter-clockwise.

3. 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 Step

1 and Step 2.

• Stop the SERVICETEST, turn the main power disconnect switch to the “Off” position and reconnect Economizer 4-pin power connector if disconnected for this procedure.

• Proceed to the next component start-up procedure.

Figure 43. Plenum fan rpm label

Economizer Start-Up ReliaTel™ Control

WARNING

Live Electrical Components!

Minimum Position Setting for 7.5 - 10Ton with Multi-Speed, or Single ZoneVAV

WARNING

Live Electrical Components!

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 properlysense smoke in the return airstream, the air velocity enteringthe unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will developan airflow velocitythat falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

1. Apply power to the unit

2. Using the Service Test Guide on unit access panel, momentarily jump across theTest 1 &Test 2 terminals on LTB1 one time to start indoor fan.

3. Turn the MIN POS - DESIGN potentiometer on the RTEM clockwise to open or counter-clockwise to close.

The damper will open to this setting for low speed fan

operation. When adjusting minimum position, the damper may move to the new setting in several small steps.Wait at least 15 seconds for the damper to settle at the new position.

4. Momentarily jump across theTest 1 &Test 2 terminals on LTB1, cycle through test modes to Cool 2 (2-Step Cooling applications) or Cool 3 (3-Step Cooling applications).Verify the indoor motor rpm is at 100% of the user selected airflow.

5. Turn the MIN POS - DCV potentiometer on the RTEM clockwise to open or counter-clockwise to close.This will set the minimum damper position for high speed fan operation.

6. The economizer minimum damper position for all fan speeds is complete.The RTEM will control minimum damper position along an imaginary line between the damper minimum positions based on fan speed.

7. Replace the filter access panel.The damper will close when the blower circuit is de-energized.

40 RT-SVX23F-EN

Page 41

WARNING

Rotating Components!

During installation, testing, servicing and troubleshooting of this product it may be necessary to work with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions could result in rotating components cutting and slashing technician which could result in death or serious injury.

Using the ServiceTest Guide in Table 8, p. 38, momentarily jump across theTest 1 &Test 2 terminals on LTB1 one time to start the Minimum VentilationTest.

1. Set the minimum position setpoint for the economizer to the required percentage of minimum ventilation using the setpoint potentiometer located on the Economizer Control (ECA).

The economizer will drive to its minimum position

setpoint, exhaust fans (if applicable) may start at random, and the supply fan will start when the SERVICETEST 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 theTest 1 &Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired startup componentTest is started.

4. Verify that the dampers stroked to the full open position.

5. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

Compressor Start-Up

Using the ServiceTest Guide in Table 8, p. 38, continue the SERVICETEST start-up procedure for each compressor circuit.

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.

2. Momentarily jump across theTest 1 &Test 2 terminals on LTB one additional time if continuing fromprevious component start-up or until the desired start-up componentTest is started.

Start-Up

backwards, it will not pump and a loud rattling sound can be observed.

b. If the electrical phasing is correct, before

condemning a compressor, interchange any two leads (at the compressorTerminal block) to check the internal phasing. If the compressor runs backwardfor an extendedperiod (15 to 30 minutes), the motor winding can overheat and cause the motor winding thermostat to open.

3. 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.

4. Check system superheat. Follow the instruction listed on the superheat charging curve in the Service Facts. Superheat should bewithin ±5ºF of thesuperheat chart value.

5. Repeat Step 1 through Step 4 for each refrigerant circuit.

6. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

Heating Start-Up

Using the ServiceTest Guide in Table 8, p. 38, continue the SERVICETEST start-up procedure for each compressor circuit.

1. Clamp an amp meter around one of 1 power wires at the heater contactor.

2. Momentarily jump across theTest 1 &Test 2 terminals on LTB one additional time if continuing fromprevious component start-up or until the desired start-up componentTest is started.

3. Verify that the heater stage is operating properly.

4. Clamp an amp meter around one of 2 power wires at the heater contactor (if applicable).

5. Momentarily jump across theTest 1 &Test 2 terminals on LTB one additional time if continuing fromprevious component start-up or until the desired start-up componentTest is started.

6. Verify that the heater stage is operating properly.

7. To stop the SERVICETEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure.

stage heater

Scroll Compressors

a. Once each compressor has started, verify that the

rotation is correct. If a scroll compressor is rotating

RT-SVX23F-EN 41

Page 42

Start-Up

Final System Setup

After completing all of the pre-start and start-up procedures outlined in the previous sections (i.e., operating the unit in each of its modes through all available stages of cooling & heating), perform these final checks before leaving the unit:

• Program the Night Setback (NSB) panel (if applicable) for proper unoccupied operation. Refer to the programming instructions for the specific panel.

• Verify that the Remote panel “System” selection switch, “Fan” selection switch, and “Zone

Temperature” settings for automatic operation are

correct.

• Inspect the unit for misplaced tools, hardware, and debris.

• Verify that all exterior panels including the control panel doors and condenser grilles are secured in place.

• Close the main disconnect switch or circuit protector switch that provides the supply power to the unit’s terminal block or the unit mounted disconnect switch.

Make sure all personnel are standing clear of the unit before proceeding.The system components will start when the power is applied.

42 RT-SVX23F-EN

Page 43

Maintenance

WARNING

Hazardous Service Procedures!

The maintenance 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.

Fan Belt Adjustment - Belt Drive Units

WARNING

Live Electrical Components!

Once the new belts are installed, using a Browning or Gates tension gauge (or equivalent) illustrated in

Figure 44, p. 43; 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 a 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 b.

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

4. Place thelarge end ofthe gauge at thecenter of thebelt span; then depress the gauge plunger until the largeOring is even with the top of the next belt or even with a straightedge placed across the fan and motor sheaves. Refer to Figure 44, p. 43.

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. 44. If the

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

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

maximum “force” value shown in Table 10, p. 44

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

2 to 3 days of operation. Belt tension may decrease until the new belts are “run in”.

WARNING

Rotating Components!

The fan belts must be inspected periodically to assure

proper unit operation.

Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a matched set of belts to ensure equal belt length.

When removing or installing the new belts, do not stretch

them over the sheaves. Loosen the belts using the belt tension adjustment bolts on the motor mounting base.

RT-SVX23F-EN 43

Figure 44. Belt tension gauge

Page 44

Maintenance

Table 10. Belt tension measurement and deflection

ranges

Deflection Force (Lbs.)

Belts

Cross

Section

Super

Small P.D

Range

3.0 - 3.6 3 4 1/2 3 7/8 5 1/2 3 1/4 4

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

5.0 - 7.0 4 5 1/2 5 6 7/8 4 1/4 5 1/4

3.4 - 4.2 4 5 1/2 5 3/4 8 4 1/2 5 1/2

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

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

Gripbelts Gripnotch

Min. Max. Min. Max. Min. Max

Steel Cable

Gripbelts

Monthly Maintenance

Filters

Inspect the return air filters. Clean or replace them if necessary. If included, leave filter removal tool in unit. Refer to the unit Service Facts for filter information.

Return Air Smoke Detector Maintenance

Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

Condensate Overflow Switch

During maintenance, the switch float (black ring) must be checked to ensure free movement up and down.

Cooling Season

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

• Inspect the evaporator and condenser coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in “Coil Cleaning” later in this section.

• Manually rotate the condenser fan(s) to ensure free movement and check motor bearings for wear. Verify that all of the fan mounting hardware is tight.

• Inspect the F/A-R/A damper hinges and pins to ensure that all moving parts are securely mounted. Keep the blades clean as necessary.

• Verify that all damper linkages move freely; lubricate with white grease, if necessary.

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Check the fan shaft bearings for wear. Replace the bearings as necessary.

• Check the supply fan belt. If the belt is frayed or worn, replace it. Refer to the “Fan Belt Adjustment” section for belt replacement and adjustments.

• Verify that all wire terminal connections are tight.

• Remove any corrosion present on the exterior surfaces of the unit and repaint these areas.

• Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping connections, etc.).

• Make sure that all retaining screws are reinstalled in the unit access panels once these checks are complete.

• With the unit running, check and record the: ambient temperature; compressor suction and discharge pressures (each circuit); superheat (each circuit);

Record this data on an “operator’s maintenance log” like the one shown in Table 11,p. 46. If the operating pressures indicate a refrigerant shortage, measure the system superheat. For guidelines, refer to the “Compressor StartUp” section.

Important: Do not release refrigerant to the

atmosphere! If adding or removing refrigerant is required, the service technician must comply with all federal, state and local laws.

Heating Season

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

• Check supply fan motor bearings; repair or replace the motor as necessary.

• Inspect both the main unit control panel and heat section control box for loose electrical components and terminal connections, as well as damaged wire insulation. Make any necessary repairs.

• Verify that the electric heat system operates properly.

Coil Cleaning

Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by minimizing: compressor head pressure and amperage draw; evaporator water carryover; fan brake horsepower, due to increase static pressure losses; airflow reduction.

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

in a “dirty” environment, clean the evaporator and condenser coils using the instructions outlined below. Be sure to follow these instructions as closely as possible to avoid damaging the coils.

44 RT-SVX23F-EN

Page 45

Note: For units equipped with hail guards follow removal

procedure listed below.

Hail Guard Removal

Figure 45. Slide-style

• Unlatch hail guards.

• Pull the top of the hail guard outward until the fastener studs are free of the retaining nuts.

• Lift the hail guard from the lower retaining bracket and set aside.

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

(either a garden pump-up type or ahigh-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.

WARNING

Hazardous Chemicals!

Coil cleaning agents can be either acidic or highly alkaline and can burn severely if contact with skin occurs. Handle chemical carefully and avoid contact with skin. ALWAYS wear Personal Protective Equipment (PPE) including goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer’s Materials Safety Data Sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.

Maintenance

WARNING

Hazardous Pressures!

Coils contain refrigerant under pressure.When cleaning coils, maintain coil cleaning solution temperature under 150°F to avoid excessive pressure in the coil. Failure to follow these safety precautions could result in coil bursting, which could result in death or serious injury.

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:

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

b. the minimum nozzle spray angle is 15 degrees.

c. maintain a minimum clearance of 6" between the

sprayer nozzle and the coil.

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

the coil face.

6. Spray the leaving-airflow side of the coil first; then spray the opposite side of the coil. Allow the cleaning solution to stand on the coil for five minutes.

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

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

9. Reinstall all of the components and panels removed in

Step 1 and any protective covers installed in Step 2.

Note: For units equipped with hail guards follow

reinstallation procedure listed below.

Hail Guard Reinstallation

To reinstall the hail guard, locate the bottom of the hail

guard in the lower bracket and secure it to the upper unit bracket with the attached fasteners.

Note: Secure hail guard latches.

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

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-SVX23F-EN 45

Page 46

Maintenance

Final Process

For future reference, you may find it helpful to record the unit data requested below in the blanks provided.

Complete Model Number

_____________________________________________________

Unit Serial Number

_____________________________________________________

Table 11. Sample maintenance log

Refrigerant Circuit #1 Refrigerant Circuit #2

Date

Current Ambient Temp. F/C

Compr. Oil Level

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

Suct. Press. Psig/ kPa

Disch. Press. Psig/ kPa

Liquid Press. Psig/ kPa

Super

-heat F/C

Wiring Diagram Numbers (from unit control panel)

_____________________________________________________

Schematics

_____________________________________________________

Connections

_____________________________________________________

Subcool. F/C

Compr. Oil Level

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

- ok

- low

Suct. Press. Psig/kPa

Disch. Press. Psig/ kPa

Liquid Press. Psig/ kPa

Superheat F/C

Subcool. F/C

46 RT-SVX23F-EN

Page 47

Troubleshooting

WARNING

Hazardous Service Procedures!

The 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

When necessary to work with live electrical

The RTRM has the ability to provide the service personnel

with some unit diagnostics andsystem status information.

Before turning the main power disconnect switch “Off”, follow the steps below to check the ReliaTel Refrigeration Module (RTRM). All diagnostics & system status information stored in theRTRM will be lost when the main power is turned “Off”.

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

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

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

5. If no failures are indicated, use one of theTEST mode procedures described in the “Unit Start-Up” section to start the unit.This procedure will allow you to check all of the RTRM outputs, and all of the external controls (relays, contactors, etc.) that the RTRM outputs energize, for each respective mode. Proceed to Step 6.

6. Step the system through all of the available modes, and verify operation of all outputs, controls, and modes. If a problemin operation isnoted in any mode, you may leave the system in that mode for up to one hour while troubleshooting. Refer to the sequence of operations for each mode, to assist in verifying proper operation. Make the necessary repairs and proceed to

Step 7 and Step 8.

7. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the power “Off” at the main power disconnect switch.

8. Refer to the individual component test procedures if other microelectronic components are suspect.

System Status Checkout Procedure

WARNING

Live Electrical Components!

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 Diagnostic” section, check the following:

• System status

• Heating status

• Cooling status

If a System failure is indicated, proceed to Step 4.Ifno failures are indicated, proceed to Step 5.

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

two methods:

Method 1

If the Zone Sensor Module (ZSM) is equipped with a remote panel with LED status indication, you can check the unit within the space. If the ZSM does not have LED’s, use Method 2. BAYSENS110*, BAYSENS109*, BAYSENS119*, & BAYSENS023A all have the remote panel indication feature.The LED descriptions are listed below.

LED 1 (System)

“On” during normal operation.

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

“Flashing” indicates test mode.

LED 2 (Heat)

“On” when the heat cycle is operating.

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

“Flashing” indicates a heating failure.

LED 3 (Cool)

“On” when the cooling cycle is operating.

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

“Flashing” indicates a cooling failure.

RT-SVX23F-EN 47

Page 48

Troubleshooting

LED 4 (Service)

“On” indicates a clogged filter.

“Off” during normal operation.

“Flashing” indicates an evaporator or condensate overflow switch failure.

Below is the complete listing of failure indication causes.

System Failure

Check the voltage between terminals 6 and 9 on J6, it should read approximately 32 VDC. If no voltage is present, a system failure has occurred. Refer to Step 4 in the previous section for the recommended troubleshooting procedure.

Cooling Failure

• Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the “Zone SensorTest Procedure” section.

• Zone temperature thermistor ZTEMP on ZTS failed. Refer to the “Zone SensorTest Procedure” section.

• 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).

• LPC1 has opened during the 3 minute minimum “on time” during 4 consecutive compressor starts, check LPC1 or LPC2 by testingvoltage 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

• If the supplyfan proving switch has closed,the unit will not operate (when connected to RTOM), check the fan motor, belts, and proving switch.

• Clogged filter switch has closed, check the filters.

• If the condensate overflow switch is closed, the unit will not operate, check the float position is not in a tripped condition and verify an "open" between wires connecting to RTOM J6-1, J6-2.

Simultaneous Heat and Cool Failure

• Emergency Stop is activated.

Method 2

The second method for determining systemstatus is done

by checking voltage readings at the RTRM (J6).The system indication descriptions and the approximate voltages are listed below.

System Failure

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

Normal Operation = approximately 32 VDC

System Failure = less than 1 VDC, approximately 0.75 VDC

Test Mode = voltage alternates between 32 VDC & 0.75

VDC

Heat Failure

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

Heat Operating = approximately 32 VDC

Heat Off = less than 1 VDC, approximately 0.75 VDC

Heating Failure = voltage alternates between 32 VDC &

0.75 VDC

Cool Failure

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

Cool Operating = approximately 32 VDC

Cool Off = less than 1 VDC, approximately 0.75 VDC

Cooling Failure = voltage alternates between 32 VDC &

0.75 VDC

Service Failure

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

Clogged Filter = Approximately 32VDC.

Normal = Less than 1 VDC, approximately 0.75 VDC Fan Failure = voltage alternates between 32 VDC & 0.75 VDC.

To use LED’s for quick status information at the unit,

purchase a BAYSENS110* ZSM and connect wires with alligator clamps to terminals 6through 10. Connected each respective terminal wire (6 through 10) from the Zone Sensor to the unit J6 terminals 6 through 10.

Note: If the system is equipped with a programmable

zone sensor, BAYSENS119* the LED indicators will not function while the BAYSENS110* is connected.

Resetting Cooling and Heating Lockouts

Cooling Failures and Heating Lockouts are reset in an identical manner. Method 1 explains resetting the system from the space; Method 2 explains resetting the system at the unit.

Note: Before resetting Cooling Failures and Heating

Lockouts check the Failure Status Diagnostics by the methods previously explained. Diagnostics will be lost when the power to the unit is disconnected.

Method 1

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

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

After approximately 30 seconds, turn the “Mode”

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

Auto.

Method 2

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

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

48 RT-SVX23F-EN

Page 49

Troubleshooting

Lockouts can be cleared through the building management system. Refer to the building management system instructions for more information.

Zone Temperature Sensor (ZTS) Service Indicator

The ZSM SERVICE LED is a generic indicator, that will

signal the closing of a Normally Open switch at any time, providing the Indoor Motor (IDM) is operating.This indicator is usually used to indicate a clogged filter, or an air side fan failure.

The RTRM will ignore the closing of this Normally Open

switch for 2 (±1) minutes.This helps prevent nuisance SERVICE LED indications.The exception is the LED will flash 40 seconds after the fan is turned “On” if the Fan Proving Switch is not made.

Clogged Filter Switch

This LED will remain lit the entire time that the Normally

Open switch is closed.The LED will be turned off immediately after resetting the switch (to the Normally Open position), or any time that the IDM is turned “Off”.

If the switch remains closed, and the IDM is turned “On”, the SERVICE LED will be turned “On” again after the 2 (±1) minute ignore delay.

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

unit operation. It is an indicator only.

Fan Failure Switch

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

LED will remain flashing the entire time the fan proving switch is closed,indicating a fan failure,and it will shutthe unit operations down.

Condensate Overflow Switch

When the “Condensate Overflow Switch" is closed, a drain

pan overflow condition is indicated and it will shut unit operations down.

Zone Temperature Sensor (ZTS) Test

Note: These procedures are not for programmable or

digital models and are conducted with the Zone Sensor Module electrically removed from the system.

Test 1 Zone TemperatureThermistor (ZTEMP)

This component is tested by measuring the resistance

between terminals 1 and 2 on the ZoneTemperature Sensor. Below are some typical indoor temperatures, and corresponding resistive values.

Test 2 Cooling Set Point (CSP) and Heating Set

Point (HSP)

Table 12. Cooling (CSP) and heating setpoint (HSP)

Zone

Temperature

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

The resistance of these potentiometers are measured

between the following ZSM terminals. Refer to the chart above for approximate resistances at the given setpoints.

Cool SP =Terminals 2 and 3 Range = 100 to 900 Ohms approximate

Heat SP =Terminals 2 and 5 Range = 100 to 900 Ohms approximate

Nominal ZTEMP

Resistance

Nominal CSP or HSP Resistance

Test 3 System Mode and Fan Selection

The combined resistanceof the Modeselection switchand

the Fan selection switch can be measured between terminals 2 and 4 on the Zone Sensor.The possible switch combinations are listed below with their corresponding resistance values.

Test 4 LED IndicatorTest, (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 32VDC, across an unlit LED, means the LED has failed.

RT-SVX23F-EN 49

Page 50

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

WARNING

Live Electrical Components!

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

11.

2. Disconnect wires from J6-11 and J6-12. Measure the voltage between J6-11 and J6-12, should be about 32

VDC.

3. Reconnect wires to terminalsJ6-11 and J6-12. Measure voltage again betweenJ6-11 andJ6-12, voltage should flash high and low every 0.5 seconds.The voltage on the low end will measure about 19VDC, while the voltage on the high end will measure from approximately 24 to 38 VDC.

4. Verify all modes of operation, by running the unit through all of the steps in the “Test Modes” section discussed in “Unit Start-Up”.

5. After verifying proper unit operation, exit the test mode.Turn the fan on continuously at the ZSM, by pressing the button with the fan symbol. If the fan comes on and runs continuously, the ZSM is good. If you are not able to turn the fan on, the ZSM is defective.

ReliaTel™ Refrigeration Module (RTRM) Default Chart

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

Unit Operation without a Zone Sensor

This procedure is for temporary operation only.The

economizer and condenser fan cycling functions are disabled.

WARNING

Hazardous Voltage!

1. Open and Lock the unit disconnect switch.

2. Remove the Outside Air Sensor (OAS) from the condenser section of unit.

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

4. Locate the RTRM (J6). Connect two (2) wires to terminals J6-1 and 2.

5. Connect the sensor (OAS) using two wire nuts to the two (2) field supplied wires that were connected to terminals 1 and 2 on J6.

Unit Economizer Control (ECA)

Troubleshooting ReliaTel Control

Verify Economizer Status by Economizer Actuator (ECA)

LED indicator:

OFF: No Power or Failure

ON: Normal, OK to Economize

Slow Flash: Normal, not OK to Economize

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

Error Code:

Communications Failure

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

Error Code:

1 Flash: Actuator Fault

2 Flashes:CO2 Sensor

3 Flashes: RA Humidity Sensor

4 Flashes: RATemp Sensor

5 Flashes: OA Quality Sensor

6 Flashes: OA Humidity Sensor

7 Flashes: OATemp Sensor

8 Flashes: MATemp Sensor

9 Flashes: RAM Fault

10 Flashes: ROM Fault

11 Flashes: EEPROM F

50 RT-SVX23F-EN

Page 51

Troubleshooting Procedures for Direct

Drive Plenum Fan

Prior to troubleshooting, verify all wiring and wiring connections.The motor has internal protections that will shut down the motor before damage occurs. A power cycle is required to reset some of the internal protections. Before proceeding, powerdown unit for1 minute and then power on.

Please follow steps sequentially unless directed differently in solution.

Table 13. Troubleshooting for direct drive plenum fan

Step Symptom or Test Probable Cause and Solution

Obstruction

blocking operation of evaporator fan.

Check line to line

voltage at pin 1, 2, and 3 of PPF-IDFP.

Verify continuity

across fuse FU31, FU32, and FU33.

Measure DC voltage

across pin Vt and com on MMC.

Check for 24VAC

across pins A and B on F relay.

Check for 10VDC across pin 9 on F

relay an pin 8 of PPM-IDFC.

Measure DC voltage

across pin Vt and com on MMC.

Verify VDC is same across Vt and com

on MMC and pin 1 and pin 8 on PPMIDFC.

Verify correct wiring

connections at KL3 in the motor.

If obstruction is present, remove power from unit and remove obstruction. Check fan wheel for damage. Remove wheel/motor assembly if damaged.

Voltage should be same as line to line voltage input to unit. If voltage is same go to step 4. If not, go to step 3.

Replace fuse if continuity is not present.

Voltage should be greater than 1.0 VDC. If voltage is greater the 1.0, go to step 8. If not, turn knob on MMC counter-clock wise 1 turn and check voltage again. If no change in voltage, go to step 5

If voltage is not present, verify thermostat wiring. Go to step 4. If voltage is present, go to step 6.

If voltage is not present, check wiring to F relay . Correct wiring if needed. Go to step 4. If wiring is correct, replace relay.

Voltage should be greater than 1.0 VDC. If voltage not present, replace MMC.

If voltage is not same, check for correct wiring. If voltage is the same go to step 9.

If wiring is correct, replace motor.

Troubleshooting

RT-SVX23F-EN 51

Page 52

Wiring Diagrams

Note: Wiring diagrams can be accessed using e-Library

by entering the diagram number in the literature order number search field or by contacting technical support.

Table 14. Unit wiring diagram numbers

Schematic

Type Voltage Drawing Number Description

4366-1007 2 - 7.5 Ton Heat Pump 4366-1043 10 Ton Heat Pump

4366-1008 230v/60hz/1ph 2 - 5 Ton Heat Pump / Standard Drive Motor 4366-1021 230v/60hz/3ph 2 - 5 Ton Heat Pump / Direct Drive 4366-1014 230v/60hz/3ph 2 - 7.5 Ton Heat Pump / Belt Drive Motor 4366-1036 230v/60hz/3ph 10 Ton Heat Pump / Belt Drive Motor 4366-1024 2 - 5 Ton Heat Pump / Standard Drive Motor 4366-1010 460-575v/60hz/3ph 2 - 7.5 Ton Heat Pump / Belt Drive Motor 4366-1035 460-575v/60hz/3ph 10 Ton Heat Pump / Belt Drive Motor 4366-1510 230v/60hz/1ph 2 - 5 Ton Heat Pump 4366-1511 208-230,460,575v/60hz/3ph 2 - 5 Ton Heat Pump / Direct Drive 4366-1512 208-230,460,575v/60hz/3ph 2 - 5 Ton Heat Pump / Belt Drive 4366-1542 208-230,460,575v/60hz/3ph 6 - 7.5 Ton Heat Pump / Belt Drive 4366-1535 208-230,460,575v/60hz/3ph 10 Ton Heat Pump / Belt Drive 4366-7446 230-460v/60Hz/3Ph - 10 Ton Heat Pump 4366-7447 575v/60Hz/3Ph - 10 Ton Heat Pump 4366-1031 Through The Base Utilities Schematic 4366-1048 CO2 / Ventilation Override Schematics 4366-1091 5.0 KW - 208-240v/60hz/1ph BAYHTRR105A 4366-1092 10.0 KW - 208-240v/60hz/1ph BAYHTRR110A 4366-1093 13.8 KW - 208-240v/60hz/1ph BAYHTRR114A 4366-1098 17.6 KW - 208-240v/60hz/1ph BAYHTRR118A 4366-1084 9.0 & 18.0 KW - 208-240v/60hz/3ph BAYHTRS309A, BAYHTRS318A 4366-1094 12.0 & 17.4 KW - 208-240v/60hz/3ph BAYHTRR312A, BAYHTRR318A 4366-1095 23.0 KW - 208-240v/60hz/3ph BAYHTRR323A 4366-1089 27.0 & 36.0 KW - 208-240v/60hz/3ph BAYHTRS327A, BAYHTRS336A 4366-1086 54.0 KW - 208-240v/60hz/3ph BAYHTRT354A 4366-1096 6.0 KW - 208-600v/60hz/3ph BAYHTRR306A, BAYHTRR406A, BAYHTRRW06A

4366-1097

4366-1087

4366-1089

4366-1090 54.0 KW - 480-600v/60hz/3ph BAYHTRT454A, BAYHTRTW54A

9.0 & 18 KW - 480-600v/60hz/3ph BAYHTRS409A, BAYHTRSW09A, BA YHTRS418A, BAYHTRT418A, BAYHTRSW18A, BAYHTRTW18A

12.0, 17.4 & 23.0 KW - 480-600v/60hz/3ph BAYHTRR412A, BAYHTRR418A, BAYHTRR423A, BAYHTRRW12A, BAYHTRRW18A, BAYHTRRW23A

27.0 & 36.0 KW - 480-600v/60hz/3ph BAYHTRS427A, BAYHTRT427A, BAYHTRSW27A, BAYHTRTW27A, BAYHTRS436A, BAYHTRT436A, BAYHTRSW36A, BAYHTRTW36A

Control

Power and

Control

Power

Connection

Connection Electric Heat

208-230,

460, 575 230-460 4366-7427 230-460v/60Hz/3Ph - 10 Ton Heat Pump

575 4366-7428 575v/60Hz/3Ph - 10 Ton Heat Pump

230V

460-575V

230V

208-230,

460, 575

208-240V

208-600V

52 RT-SVX23F-EN

Page 53

Limited Warranty

Heat Pump WCC, WCD, WCH, WCM and

WSC (Parts Only)

Models LessThan 20Tons for Residential Use*

This limited warranty is extended byTrane Inc., to the

original purchaser and to anysucceeding owner ofthe 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.

If any part of your Heat Pump fails because of a manufacturing defect withinfive years from the date ofthe original purchase, Warrantor will furnish without charge the required replacement part. Any local transportation, related service labor, diagnosis calls, refrigerant and related items are not included.

If the sealed motor-compressor fails because of a manufacturing defect within five years from the date of original purchase, Warrantor will furnish without charge the required replacement compressor. Any local transportation, related service labor, diagnosis calls, refrigerant and related items are not included.

This limited warranty does not cover failure of your Heat

Pump if it is damaged while in your possession, failure attributable or caused by unreasonable use of the Heat Pump and/or failure to properlymaintain the Heat Pump as set forth in the Use and Care manual.

This limited warranty applies to product installed on or

after 10/1/2001 where product is manufactured after 1/1/

2000.This limited warranty is not retroactive to any installations prior to 10/1/2001 or on product produced prior to 2000.

THE LIMITED 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 INFACT, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long an implied limited 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 limited warranty gives you specific legal rights, and

you may also have other rights which vary from state to state. Parts will be provided by our factory organization through an authorized service organization in your area listed in the yellow pages. If you wish further help or information concerning this limited warranty, contact:

Trane

2701 Wilma Rudolph Blvd.

Clarksville,TN 37040-1008

Attention: Manager, Product Service

GW-611-4001

*This limited warranty is for residential usage of this equipment and not applicable when this equipment is used for a commercial application. A commercial use is any application where the end purchaser uses the product for other than personal, family or household purposes.

RT-SVX23F-EN 53

Page 54

Limited Warranty

Heat Pump WCZ, WCY, WCX, WCC, WCD,

WCH, WCM, WCP and WSC (Parts Only)

Models LessThan 20Tons for Commercial Use*

This warranty is extended byTrane Inc., to the original

purchaser and to any succeeding owner of the real property to which the Heat Pump is originally affixed, and applies to products purchased and retained for use within the U.S.A. and Canada.There is no warranty against corrosion, erosion or deterioration.

If any part of your Heat Pump fails because of a manufacturing defect within one year from the date of the original purchase, Warrantor will furnish without charge the required replacement part.

In addition, if the sealed motor-compressor fails because of a manufacturing defect within the second through fifth year from the date of original purchase, Warrantor will furnish without charge the required replacement compressor.Warrantor’s obligations and liabilities under this warranty are limited to furnishing F.O.B. Warrantor factory or warehouse replacement parts for Warrantor’s products covered under this warranty. Warrantor shall not be obligated to pay for the cost of lost refrigerant. No liability shall attach to Warrantor until products have been paid for and then liability shall be limited solely to the purchase price of the equipment under warranty shown to be defective.

THEWARRANTYAND 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 MERCHANTABILITYAND FITNESS FOR

PARTICULAR USE, AND IN NO EVENT SHALL

WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR

CONSEQUENTIAL DAMAGES.

Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Trane

2701 Wilma Rudolph Blvd.

Clarksville,TN 37040-1008

Attention: Manager, Product Service

GW-604-4800

*This warranty is for commercial usage of said equipment and not applicable when the equipment is used for a residential application. Commercial use is any application where the end purchaser uses the product for other than personal, family or household purposes.

54 RT-SVX23F-EN

Page 55

Page 56

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.

RT-SVX23F-EN 15 Oct 2013

Supersedes RT-SVX23F-EN (10 Aug 2012)

We are committed to using environmentally

conscious print practices that reduce waste.