Trane WSC036A Manual del propietario

February 2009 RT-SVX23D-EN

Installation

Operation

Maintenance

Packaged Heat Pump

3 Through 10 Ton

Model Numbers

WSC036A - WSC120A

WSC036E - WSC060E

Warnings, Cautions and Notices

Important

Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth's naturally

occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the

identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine

and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all

refrigerants containing these compounds have the same potential impact to the environment.

Trane advocates the responsible handling of all refrigerants-including industry replacements for

CFCs such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are important to the environment, our

customers, and the air conditioning industry. All technicians who handle refrigerants must be

certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling,

reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these

service procedures. In addition, some states or municipalities may have additional requirements

that must also be adhered to for responsible management of refrigerants. Know the applicable

laws and follow them.

Overview of Manual

Note: One copy of this document ships inside the control panel of each unit and is customer

property. It must be retained by the unit’s maintenance personnel.

This booklet describes proper installation, operation, and maintenance procedures for air cooled

systems. By carefully reviewing the information within this manual and following the instructions,

the risk of improper operation and/or component damage will be minimized.

It is important that periodic maintenance be performed to help assure trouble free operation. A

maintenance schedule is provided at the end of this manual. Should equipment failure occur,

contact a qualified service organization with qualified, experienced HVAC technicians to properly

diagnose and repair this equipment.

Model Number Description

All products are identified by a multiple-character model number that precisely identifies a

particular type of unit. An explanation of the alphanumeric identification code is provided below.

Its use will enable the owner/operator, installing contractors, and service engineers to define the

operation, specific components, and other options for any specific unit.

ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout

this literature. Read these carefully. Your personal safety and the proper operation of this

machine depend upon the strict observance of these precautions.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, could

result in minor or moderate injury. It may also be used to alert against unsafe practices.

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

accidents.

RT-SVX23D-EN 3

Warnings, Cautions and Notices

When ordering replacement parts or requesting service, be sure to refer to the specific model

number and serial number printed on the unit nameplate.

WARNING

Contains Refrigerant under Pressure!

System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure

before opening the system. See unit nameplate for refrigerant type. Do not use non-approved

refrigerants, refrigerant substitutes, or refrigerant additives.

Failure to follow proper procedures or the use of non-approved refrigerants, refrigerant

substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

WARNING

R-410A Refrigerant under Higher Pressure than R-22!

The units (WSC036E-WSC060E) described in this manual use R-410A refrigerant which operates

at higher pressures than R-22 refrigerant. Use ONLY R-410A rated service equipment or

components with this unit. For specific handling concerns with R-410A, please contact your

local Trane representative.

Failure to use R-410A rated service equipment or components could result in equipment

exploding under R-410A high pressures which could result in death, serious injury, or equipment

damage.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run

capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power

cannot be inadvertently energized. Verify with an appropriate voltmeter that all capacitors have

discharged. Failure to disconnect power and discharge capacitors before servicing could result in

death or serious injury.

WARNING

Harmful Ultraviolet (UV) Lights!

Do not field install ultraviolet lights in the manufacturer air handling equipment for the intended

purpose of improving indoor air quality. High intensity C-band ultraviolet light is known to

severely damage polymer (plastic) materials and poses a personal safety risk to anyone exposed

to the light without proper personal protective equipment (can cause damage to eyes and skin).

Polymer materials commonly found in HVAC equipment that may be susceptible include

insulation on electrical wiring, fan belts, thermal insulation, various fasteners and bushings.

Degradation of these materials could result in serious damage to the equipment. Failure to

follow this recommendation could result in death or serious injury and equipment damage.

The manufacturer accepts no responsibility for the performance or operation of our air handling

equipment in which ultraviolet devices were installed outside of the manufacturer’s factory.

NOTICE

Roof Damage!

System contains oil and refrigerant under high pressure. Roofs should be protected from

exposure to oils and refrigerant in the system. If rooftop is not protected damage to the roof may

occur.

4RT-SVX23D-EN

Table of Contents

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

Overview of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Model Number Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Unit Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Compressor Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 1. Typical Unit Weights & Point Loading Data . . . . . . . . . . . . . . . . . . . 16

Table 2. Typical Unit Weights & Point Loading Data . . . . . . . . . . . . . . . . . . . 17

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

General Unit Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 4. AC Conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 5. DC Conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 6. Temperature versus resistance

(temperature vs. resistance is negative) . . . . . . . . . . . . . . . . . . . . . 37

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

Table 7. Service test guide for component operation . . . . . . . . . . . . . . . . . . 41

Table 8. Belt tension measurement and deflection ranges . . . . . . . . . . . . . . 47

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 9. Sample maintenance log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 10. Cooling (CSP) and heating setpoint (HSP) . . . . . . . . . . . . . . . . . . . . 55

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

RT-SVX23D-EN 5

Model Number Descriptions

DIGIT 1 - Unit Function

W = Packaged Heat Pump

DIGIT 2 - Efficiency

S = Standard Efficiency

DIGIT 3 - Airflow

C = Convertible

DIGITS 4,5,6 - Nominal Gross

Cooling Capacity (MBh)

036 = 3 Ton

048 = 4 Ton

060 = 5 Ton

072 = 6 Ton

090 = 7½ Ton

120 = 10 Ton

DIGIT 7 - Major Design Sequence

A= First

E=R410A

DIGIT 8 - Unit Voltage

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 - Electric Heater

0 = No Electric Heater

A = 5 kw (1 phase)

B = 6 kw (3 phase)

D = 10 kw (1 phase)

E = 12 kw (3 phase)

F = 14 kw (1 phase)

G = 18 kw (1 and 3 phase)

J = 23 kw (3 phase)

K = 27 kw (3 phase)

N = 36 kw (3 phase)

P = 54 kw (3 phase)

DIGIT 11 - Minor Design

Sequence

A = First Sequence

DIGITS 12,13 - Service Sequence

Factory Assigned

DIGIT 14 - Fresh Air Selection

0=NoFreshAir

A = Manual Outside Air Damper

0-50%

B = Motorized Outside Air Damper 0-

50%

C = Economizer, Dry Bulb 0-100%

without Barometric Relief

D = Economizer, Dry Bulb 0-100%

withBarometric Relief

E = Economizer, Reference Enthalpy

0-100% without Barometric Relief

F = Economizer, Reference Enthalpy

0-100% with Barometric Relief

G = Economizer, Comparative

Enthalpy 0-100% without

Barometric Relief

H = Economizer, Comparative

Enthalpy 0-100% with Barometric

Relief

DIGIT 15 - Supply Fan/Drive Type/

Motor

0=StandardDrive

1 = Oversized Motor

2 = Optional Belt Drive Motor

DIGIT 16 - Hinged Service

Access/Filters

0 = Standard Panels/Standard Filters

A = Hinged Access Panels/Standard

Filters

B = Standard Panels with 2 inch

MERV 7 pleated filter

C = Hinged Access Panels with 2 inch

MERV 7 pleated filter

D = Standard Panels with 2 inch

MERV 13 pleated filter

E = Hinged Access Panels with 2 inch

MERV 13 pleated filter

DIGIT 17 - Condenser Coil

Protection

0 = Standard Coil

1 = Standard Coil with Hail Guard

2 = Epoxy Coated Condenser Coil

3 = Epoxy Coated Condenser Coil

with Hail Guard

4 = *CompleteCoat Condenser Coil

5 = *CompleteCoat Condenser Coil

and Hail Guard

DIGIT 18 - Through the Base

Provisions

0 = No Through the Base Provisions

A = Through the Base Electric

DIGIT 19 - Disconnect/Circuit

Breaker (3 phase only)

0 = Without Disconnect Switch/Circuit

Breaker

1 = Unit Mounted Non-Fused

Disconnect Switch

2 = Unit Mounted Circuit Breaker

DIGIT 20 - Convenience Outlet

0 = No Convenience Outlet

A = Unpowered Convenience Outlet

B = Powered Convenience Outlet

(3 phase only)

DIGIT 21 - Communications

Options

0 = No Communications Interface

1 = Trane Communications Interface

2 = LonTalk® Communications

Interface

DIGIT 22 - Refrigeration System

Option

0 = Standard Refrigeration System

DIGIT 23 - Refrigeration Controls

0 = No Refrigeration Control

1 = High Pressure Control

2=Frostat

3 = Crankcase Heater

4 = High Pressure Control and Frostat

5 = High Pressure Control and

Crankcase Heater

6 = Frostat and Crankcase Heater

7 = High Pressure Control, Frostat

and Crankcase Heater

DIGIT 24 - Smoke Detector

0=NoSmokeDetector

A = Return Air Smoke Detector

B = Supply Air Smoke Detector

C = Supply and Return Air Smoke

Detectors

DIGIT 25 - 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 Sensing Tube

6 = Fan Fail Switch and Discharge Air

Sensing Tube

7 = Clogged Filter and Fan Fail

Switches and Discharge Air

Sensing Tube

WSC036A3RBA** C000A10001A1

123456789101112,13141516171819202122232425

6RT-SVX23D-EN

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 for the compressors are located on the side 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, supply air 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) ReliaTel™ Control

The ECA monitors the mixed air temperature, return air temperature, minimum position setpoint

(local or remote), power exhaust setpoint, CO2 setpoint, CO2, and ambient dry bulb/enthalpy

sensor or comparative humidity (return air humidity against ambient humidity) sensors, if

selected, to control dampers to an accuracy of +/- 5% of stroke. The actuator is spring returned to

the closed position any time that power is lost to the unit. It is capable of delivering up to 25 inch

pounds of torque and is powered by 24 VAC.

RTCI -- ReliaTel™ Trane Communication Interface (Optional)

This module is used when the application calls for an 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. 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.

RT-SVX23D-EN 7

General Information

RTOM – ReliaTel™ Options Module (Optional)

The RTOM monitors the supply fan proving, clogged filter, supply air temperature, exhaust fan

setpoint, supply air tempering, Frostat™ and smoke detector. Refer to system input devices and

functions for operation.

System Input Devices & Functions

The RTRM must have a zone sensor or thermostat input in order to operate the 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 Input Devices used within the RTRM network are to acquaint

the operator with their function as they interface with the various modules. Refer to the unit’s

electrical schematic for the specific module connections.

The following controls are available from the factory for field installation.

Supply Fan Failure Input (Optional)

The Fan Failure Switch can be connected to sense indoor fan operation:

FFS (Fan Failure Switch) If air flow through the unit is not proven by the differential pressure switch

connected to the 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 is at least 0.5" w.c. The

contacts will automatically open when the pressure differential across the filters decreases to

approximately 0.4" w.c. The clogged filter output is energized when the supply fan is operating and

the clogged filter switch has been closed for at least 2 minutes. The system will continue to operate

regardless of the status of the filter switch.

Note: On units equiped with factory installed MERV 13 filters, a clogged filter switch with different

pressure settings will be installed. This switch will close when the differential pressure is

approximately 0.8' w.c. and open when the differential falls to 0.7" w.c.

Compressor Disable (CPR1/2)

This input incorporates the low pressure control (LPC) of each refrigeration circuit and can be

activated by opening a field supplied contact installed on the LTB.

If this circuit is open before the compressor is started, the compressor will not be allowed to

operate. Anytime this circuit is opened for 1 continuous second during compressor operation, the

compressor for that circuit is immediately turned “Off”. The compressor will not be allowed to

restart for a minimum of 3 minutes should the contacts close.

If four consecutive open conditions occur during the first three minutes of operation, the

compressor for that circuit will be locked out, a diagnostic communicated to the remote panel (if

installed), and a manual reset will be required to restart the compressor.

Low Pressure Control

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 diganostic communicated to ICS™, if applicable, and a manual reset required to

8RT-SVX23D-EN

General Information

restart tyhe compressor. On dual compressor units only the affected compressor circuit is locked

out.

High Pressure Control (Optional — Standard on R-410A models)

The high pressure controls are wired in series between the compressor outputs on the RTRM and

the compressor contactor coils. If the high pressure control switch opens, the RTRM senses a lack

of current while calling for cooling and locks the compressor out.

If four consecutive open conditions occur during an active call for cooling, the compressor will be

locked out, a diganostic communicated to ICS™, if applicable, and a manual reset required to

restart tyhe compressor. On dual compressor units only the affected compressor circuit is locked

out.

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

Only)

Zone Sensor Module (ZSM) (BAYSENS109*)

This electronic sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan

settings (On and Auto). It is a manual or auto changeover control with dual setpoint capability. It

can be used with a remote zone temperature sensor BAYSENS077*.

Programmable Zone Sensor - BAYSENS119*

This 7 day programmable sensor features 2, 3 or 4 periods 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 Sensor allows selection of 2, 3 or 4 system modes (Heat, Cool, Auto, and Off), two fan

modes (On and Auto). It has dual temperature 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, an auxiliary relay rated for 1.25 amps @ 30 volts AC with one set of

single pole double throw contacts is activated. Electronic Timeclock (BAYCLCK001A).

RT-SVX23D-EN 9

General Information

Status Inputs (4 Wires Optional). The ZSM can be wired to receive four (4) operating status signals

from the RTRM (HEAT, COOL, SYSTEM “ON”, SER-VICE). Four (4) wires from the RTRM should be

connected to the appropriate terminals (7, 8, 9 & 10) on the ZSM.

Remote Zone Sensor (BAYSENS073*)

This electronic sensor features remote zone sensing and timed override with override cancellation.

It is used with a Trane Integrated ComfortTM building management system.

Remote Zone Sensor (BAYSENS074*)

This electronic sensor features single setpoint capability and timed override with override

cancellation. It is used with a Trane Integrated ComfortTM building management system.

Remote Zone Sensor (BAYSENS016A)

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.

High Temperature Sensor (BAYFRST001A)

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 fire in the air conditioning or ventilation ducts. The sensor is designed to mount directly to

the sheet metal duct. Each kit contains two sensors. The return air duct sensor (X1310004001) is

set to open at 135°F. The supply air duct sensor (X1310004002) is set to open at 240°F. The control

can be reset after the temperature has been lowered approximately 25°F below the cutout setpoint.

Evaporator Frost Control

This input incorporates the 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 open before the compressor is started, the compressor will not be allowed to

operate. Anytime this circuit is opened for 1 continuous second during compressor operation, the

compressor for that circuit is immediately turned “Off”. The compressor will not be allowed to

restart for a minimum of 3 minutes should the FOS close.

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.

Note: Important! The supply and return air smoke detectors are designed to shut off the unit if

smoke is sensed in the supply air stream or return air stream. This function is performed

by sampling the airflow entering the unit at the return air opening. Follow the instructions

provided below to assure that the airflow through the unit is sufficient for adequate

sampling. Failure to follow these instructions will prevent the smoke detectors from

performing it's design function.

Note: Important! Airflow through the unit is affected by the amount of dirt and debris

accumulated on the indoor coil and filters. To insure that airflow through the unit is

adequate for proper sampling by the return air smoke detector, complete adherence to the

maintenance procedures, including recommended intervals between filter changes, and

coil cleaning is required.

10 RT-SVX23D-EN

General Information

Note: Important! Periodic checks and maintenance procedures must be performed on the smoke

detector to insure that it will function properly. For detailed instructions concerning these

checks and procedures, refer to the appropriate section(s) of the smoke detector Installation

and Maintenance Instructions provided with the literature package for this unit.

In order for the supply air smoke detector or return air smoke detector to properly sense smoke

in the supply air stream or return air stream, the air velocity entering the smoke detector unit must

be between 500 and 4000 feet per minute. Equipment covered in this manual will develop an

airflow velocity that falls within these limits over the entire airflow range specified in the evaporator

fan performance tables.

There are certain models, however, if operated at low airflow, will not develop an airflow velocity

that falls within the required 500 to 4000 feet per minute range. For these models, the design airflow

shall be greater than or equal to 1000 feet per minute MINIMUM.

Phase Monitor

This sensor monitors voltage between the 3 conductors of the 3 phase power supply. Two LED

lights are provided. The green light indicates that a balanced 3 phase supply circuit is properly

connected. The red light indicates that unit operation has been prevented. There are two conditions

that will prevent unit operation.The power supply circuit is not balanced with the proper phase

sequence of L1,L2,L3 for the 3 conductors of a 3 phase circuit. The line to line voltage is not between

180 volts and 633 volts.

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