Carrier INTEGRA 30S User Manual

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OPERATION AND

SERVICE MANUAL

INTEGRA 30S

TRUCK REFRIGERATION UNIT

BEGINNING WITH S/N PB 225225

TABLE OF CONTENTS

PARAGRAPH NUMBER Page

GENERAL SAFETY NOTICES Safety-1............................................................

FIRST AID Safety-1.............................................................................

OPERATING PRECAUTIONS Safety-1............................................................

MAINTENANCE PRECAUTIONS Safety-1..........................................................

SPECIFIC WARNING AND CAUTION STATEMENTS Safety-1........................................

DESCRIPTION 1-1...............................................................................

1.1 INTRODUCTION 1-1.....................................................................

1.2 GENERAL DESCRIPTION 1-1.............................................................

1.3 CONDENSING SECTION 1-1.............................................................

1.3.1 Condenser/Subcooler 1-1..............................................................

1.3.2 Filter Drier 1-1........................................................................

1.3.3 Oil Separator 1-3.....................................................................

1.3.4 Hot Gas Solenoid Valve (HGS1) 1-3.....................................................

1.3.5 Condenser Pressure Control Valve (HGS2) 1-3...........................................

1.3.6 Compressor 1-3......................................................................

1.3.7 Standby Motor 1-3....................................................................

1.3.8 Receiver 1-3.........................................................................

1.3.9 High Pressure Switch (HP1) 1-4........................................................

1.3.10 Condenser Pressure Control Switch (HP2) 1-4............................................

1.4 EVAPORATOR SECTION 1-4.............................................................

1.4.1 Thermostatic Expansion Valve 1-4......................................................

1.4.2 Compressor Pressure Regulating Valve (CPR) (115V Only) 1-4.............................

1.4.3 Defrost T ermination Thermostat (DTT) 1-4...............................................

1.4.4 Quench Valve (BPV) 1-4...............................................................

1.4.5 Evaporator 1-4.......................................................................

1.4.6 Low Pressure Switch (LP) 1-4..........................................................

1.5 SYSTEM OPERATING CONTROLS AND COMPONENTS 1-8.................................

1.6 UNIT SPECIFICATIONS 1-9...............................................................

1.6.1 Compressor Data 1-9.................................................................

1.6.2 Refrigeration System Data 1-9..........................................................

1.6.3 Electrical Data 1-10....................................................................

1.6.4 T orque Values 1-10....................................................................

1.7 SAFETY DEVICES 1-11...................................................................

1.8 REFRIGERANT Circuit 1-12................................................................

1.8.1 Cooling 1-12..........................................................................

1.8.2 Heat And Defrost 1-12..................................................................

62--10848

TABLE OF CONTENTS (Continued)

PARAGRAPH NUMBER Page

OPERATION 2-1.................................................................................

2.1 CONTROL SYSTEM 2-1..................................................................

2.1.1 Introduction 2-1......................................................................

1.8.3 Microprocessor Module 2-1............................................................

2.1.2 Cab Command 2-1....................................................................

2.2 START-- UP 2-2..........................................................................

2.2.1 Inspection 2-2........................................................................

2.2.2 Connect Power 2-3...................................................................

2.2.3 Starting 2-3..........................................................................

2.3 SETPOINT ADJUSTMENT 2-3............................................................

2.4 MANUAL DEFROST 2-3..................................................................

2.5 DEFROST CYCLE ADJUSTMENT 2-3......................................................

2.6 ALARM DISPLAY 2-4.....................................................................

2.6.1 Accessing Alarm Messages 2-4........................................................

2.6.2 Low Battery Voltage Alarm for Road Only Units 2-5.......................................

2.6.3 Clearing Alarm Messages 2-5..........................................................

2.7 CHECKING THE EEPROM VERSION 2-5...................................................

2.8 STOPPING THE UNIT 2-5................................................................

2.9 MICROPROCESSOR CONFIGURATION 2-6................................................

2.9.1 ROAD ONLY FUNCTIONAL SETTINGS 2-6.............................................

2.9.2 ROAD/STANDBY FUNCTIONAL SETTINGS 2-7.........................................

TEMPERATURE CONTROL 3-1...................................................................

3.1 SEQUENCE OF OPERATION 3-1..........................................................

3.1.1 Perishable Mode 3-1..................................................................

3.1.2 Frozen Mode 3-1.....................................................................

3.2 DEFROST CYCLE 3-2....................................................................

3.3 MINIMUM OFF TIME 3-2.................................................................

SERVICE 4-1....................................................................................

4.1 MAINTENANCE SCHEDULE 4-1...........................................................

4.2 BELT MAINTENANCE AND ADJUSTMENT 4-2..............................................

4.2.1 Standby Motor--Compressor V-Belt 4-2..................................................

4.3 INSTALLING R-134A MANIFOLD GUAGE SET 4-2..........................................

4.3.1 Preparing Manifold Gauge/Hose Set For Use 4-2.........................................

4.3.2 Connecting Manifold Gauge/Hose Set 4-2................................................

4.3.3 Removing the Manifold Gauge Set 4-3..................................................

4.4 REMOVING THE REFRIGERANT CHARGE 4-3.............................................

4.4.1 Refrigerant Removal From A Non--Working Compressor. 4-3...............................

4.5 REFRIGERANT LEAK CHECKING 4-3.....................................................

4.6 EVACUATION AND DEHYDRATION 4-4....................................................

4.6.1 General 4-4..........................................................................

4.6.2 Preparation 4-4.......................................................................

4.6.3 Procedure For Evacuation And Dehydrating System 4-4...................................

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TABLE OF CONTENTS (Continued)

PARAGRAPH NUMBER Page

SERVICE (Continued) 2-1........................................................................

4.7 CHARGING THE REFRIGERATION SYSTEM 4-5...........................................

4.7.1 Checking The Refrigerant Charge 4-5...................................................

4.7.2 Installing A Complete Charge 4-5.......................................................

4.7.3 Adding A Partial Charge 4-5............................................................

4.8 CHECKING FOR NON--CONDENSABLES 4-5...............................................

4.9 REPLACING THE COMPRESSOR 4-6.....................................................

4.9.1 Removing Compressor 4-6.............................................................

4.9.2 Installing Compressor 4-6..............................................................

4.10 CHECKING AND REPLACING FILTER-DRIER 4-6...........................................

4.10.1 Checking Filter-Drier 4-6...............................................................

4.10.2 Replacing The Filter-Drier 4-6..........................................................

4.11 HIGH PRESSURE (HP1) AND CONDENSER PRESSURE (HP2) SWITCHES 4-6................

4.11.1 Removing Switch 4-6..................................................................

4.11.2 Checking Pressure Switch 4-6..........................................................

4.12 CHECKING AND REPLACING CONDENSER FAN MOTOR BRUSHES 4-7.....................

4.13 HOT GAS (HGS1) AND CONDENSER PRESSURE CONTROL SOLENOID VALVES 4-7.........

4.13.1 Replacing Solenoid Coil 4-7...........................................................

4.13.2 Replacing Valve Internal Parts 4-7.......................................................

4.14 ADJUSTING THE COMPRESSOR PRESSURE REGULATING VALVE (CPR) (115V ONLY) 4-8....

4.15 THERMOSTATIC EXPANSION VALVE 4-8..................................................

4.15.1 Replacing expansion valve 4-8.........................................................

4.15.2 Measuring Superheat 4-8..............................................................

4.16 DIAGNOSTIC TOOL 4-9..................................................................

4.17 MICROPROCESSOR 4-9.................................................................

4.18 EVAPORATOR COIL CLEANING 4-9.......................................................

4.19 CONDENSER COIL CLEANING 4-9........................................................

TROUBLESHOOTING 5-1.........................................................................

5.1 INTRODUCTION 5-1.....................................................................

5.2 REFRIGERATION 5-2....................................................................

5.2.1 Unit Will Not Cool 5-2.................................................................

5.2.2 Unit Runs But Has Insufficient Cooling 5-2...............................................

5.2.3 Unit Operates Long or Continuously in Cooling 5-3........................................

5.2.4 Unit Will Not Heat or Heating Insufficient 5-3.............................................

5.2.5 Defrost Malfunction 5-3................................................................

5.2.6 Abnormal Pressure 5-3................................................................

5.2.7 Abnormal Noise 5-4...................................................................

5.2.8 Cab Command Malfunction 5-4.........................................................

5.2.9 No Evaporator Air Flow or Restricted Air Flow 5-4.........................................

5.2.10 Expansion Valve 5-4..................................................................

5.2.11 Malfunction Hot Gas Solenoid or Condenser Pressure Regulating Valve 5-4..................

5.2.12 Standby Compressor Malfunction 5-4...................................................

SCHEMATIC DIAGRAMS 6-1......................................................................

6.1 INTRODUCTION 6-1.....................................................................

iii

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LIST OF ILLUSTRATIONS

FIGURE NUMBER Page

Figure 1-1 Integra 30S 1-2......................................................................

Figure1-2 TopView 1-2.........................................................................

Figure 1-3 Rear View Evaporator 1-3.............................................................

Figure 1-4 Oil Separator 1-3.....................................................................

Figure 1-5 Typical Standby Control Box 1-5

Figure 1-6 Standby Microprocessor Module 1-6....................................................

Figure 1-7 Road Microprocessor Module 1-7.......................................................

Figure 1-8 Cab Command 1-8...................................................................

Figure 1-9 Refrigeration Circuit Cooling Cycle 1-13..................................................

Figure 1-10 Refrigeration Circuit Heating Cycle 1-14..................................................

Figure 2-1 Cab Command 2-1...................................................................

Figure 2-2 Green Light Status -- Standby 2-2......................................................

Figure 2-3 Green Light Status -- Road Only 2-2....................................................

Figure 2-4 Temperature Selection Jumper 2-7......................................................

Figure 3-1 Operating Sequence -- Perishable Mode 3-1.............................................

Figure 3-2 Operating Sequence -- Frozen Mode 3-1................................................

Figure 4-1 Belt Tension Gauge 4-2...............................................................

Figure 4-2 Layout of V-belt 4-2...................................................................

Figure 4-3 Manifold Gauge Set (R-134a) 4-3.......................................................

Figure 4-4 Vacuum Pump Connection 4-4.........................................................

Figure 4-5 Typical Setup For Testing Pressure Switches HP1 And HP2 4-7............................

Figure 4-6 Fan Motor Brushes 4-7................................................................

Figure 4-7 Hot Gas or Condenser Pressure Control Solenoid 4-7.....................................

Figure 4-8 Compressor Pressure Regulating Valve 4-8..............................................

Figure 4-9 Thermostatic Expansion Valve Bulb And Thermocouple 4-8................................

Figure 4-10 Cab Command Diagnostic Tool 4-9.....................................................

Figure 6-1 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61350 Rev D 6-2.............

Figure 6-2 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61350 Rev D 6-3.............

Figure 6-3 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61353 Rev A 6-5..............

Figure 6-4 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61354 Rev A 6-6..............

Figure 6-5 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61354 Rev A 6-7..............

Figure 6-6 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61352 Rev A 6-9..............

LIST OF TABLES

TABLE NUMBER Page

Table 1-1 Model Chart 1-1......................................................................

Table 1-2 Additional Support Manuals 1-1........................................................

Table 2-1 Alarms For Road Only Units 2-4........................................................

Table 2-2 Alarms For Standby Units 2-5..........................................................

Table 4-1 Maintenance Schedules 4-1...........................................................

Table 4-2 Service Category Descriptions 4-1......................................................

Table 4-3. Belt Tension (See Figure 4-2) 4-2.......................................................

Table 4-4 R-134a Temperature-Pressure Chart 4-10................................................

Table 5-1 Alarm Indications 5-1.................................................................

Table 5-2 Mechanical Indications 5-2.............................................................

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SAFETY SUMMARY

SAFETY PRECAUTIONS

Your Carrier Transicold refrigeration unit has been designed with the safety of the operator in mind. During normal operation, all moving parts are fully enclosed to help prevent injury. During all pre-trip inspections, daily inspections, and problem troubleshooting, you may be exposed to moving parts. Stay clear of all moving parts when the unit is in operation and when the ON/OFF switch is in the ON position.

FIRST AID

No injury, no matter how slight, should go unattended. Always obtain first aid or medical attention immediately.

OPERATING PRECAUTIONS

Always wear safety glasses. Wear hearing protection as required. Keep hands, clothing and tools clear of the evaporator and condenser fans.

No work should be performed on the unit until all circuit breakers are turned off, and battery power supply is disconnected.

Always work in pairs. Never work on the equipment alone. In case of severe vibration or unusual noise, stop the unit and investigate.

MAINTENANCE PRECAUTIONS

Beware of unannounced starting of the unit. This unit is equipped with Auto--Start in both the road and standby modes. The unit may start at any time. When performing any check of the system make certain all circuit breakers are turned off, and battery power supply is disconnected.

Be sure power is turned off before working on motors, controllers, solenoid valves and electrical control switches. Tag circuit breaker and vehicle ignition to prevent accidental energizing of circuit.

Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems with the system should be diagnosed, and any necessary repairs performed, by qualified service personnel.

When performing any arc welding on the unit or container, disconnect all wire harness connectors from the microprocessor. Do not remove wire harness from the modules unless you are grounded to the unit frame with a static safe wrist strap.

In case of electrical fire, open circuit switch and extinguish with CO

REFRIGERANTS

The refrigerant contained in your unit can cause frostbite, severe burns, or blindness when in direct contact with the skin or eyes. For this reason, and because of legislation regarding the handling of refrigerants during system service, we recommend that you contact your nearest Carrier Transicold authorized repair facility whenever your unit requires refrigeration system service .

(never use water).

62--10848Safety-1

SPECIFIC WARNING AND CAUTION STA TEMENTS

To help identify the label hazards on the unit and explain the level of awareness each one carries, an explanation is given with the appropriate consequences:

DANGER -- means an immediate hazard which WILL result in severe personal injury or death.

WARNING -- means to warn against hazards or unsafe conditions which COULD result in severe personal injury or death.

CAUTION -- means to warn against potential hazard or unsafe practice which could result in minor personal injury, product or property damage.

The statements listed below are applicable to the refrigeration unit and appear elsewhere in this manual. These recommended precautions must be understood and applied during operation and maintenance of the equipment covered herein.

WARNING

Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. Press OFF key on the cab command and disconnect power plug.

WARNING

Do not attempt to connect or remove power plug before ensuring the unit is OFF (press OFF key on Cab Command) and external power circuit breaker is open.

WARNING

Beware of V-belt and belt-driven components as the unit may start automatically.

WARNING

Ensure power to the unit is OFF, power plug is disconnected and circuit breaker is open or vehicle engine is OFF and negative battery cable is connected before replacing compressor.

WARNING

Slowly open the plug on the suction and discharge valves of the new compressor to vent the nitrogen holding charge.

WARNING

Do not use a nitrogen cylinder without a pressure regulator. (See Figure 4-5) Cylinder pressure is approximately 2350 psig (160 bars). Do not use oxygen in or near a refrigerant system as an explosion may occur.

CAUTION

Under no circumstances should anyone attempt to repair the microprocessor module or Cab Command! Should a problem develop with these components, contact your nearest Carrier Transicold dealer for replacement.

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Safety-2

CAUTION

If starting unit for the first time after installation or starting after adding/removing an optional feature

if Owners operating parameters have changed, the Configuration will need to be reset.

CAUTION

Compressor failure will occur if inert gas brazing procedures are not used on units with R134A and POE oil. For more information see Technical Procedure 98-50553-00 -- Inert Gas Brazing.

CAUTION

To prevent trapping liquid refrigerant in the manifold gauge set be sure set is brought to suction pressure before disconnecting.

CAUTION

Do not damage or over tighten the enclosing tube assembly. Place all parts in the enclosing tube in proper sequence in order to avoid premature coil burn-out.

CAUTION

Observe proper polarity when installing battery, negative battery terminal must be grounded.

CAUTION

Underno circumstances should a technician electrically probe the processor at any point, other than the connector terminals where the harness attaches. Microprocessor components operate at different voltage levels and at extremely low current levels. Improper use of voltmeters, jumper wires, continuity testers, etc. could permanently damage the processor.

CAUTION

Most electronic components are susceptible to damage caused by electrical static discharge (ESD). In certain cases, the human body can have enough static electricity to cause resultant damage to the componentsby touch. This is especiallytrue of the integrated circuits found on the microprocessor. Use proper board handling techniques. (See Section 4.17).

62--10848Safety-3

SECTION 1

Road

lb(

DESCRIPTION

1.1 INTRODUCTION

WARNING

Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. Press OFF key on the Cab Command and disconnect power plug.

This manual contains Operating Data, Electrical Data and Service Instructions for the Carrier Transicold Model 30S truck refrigeration units listed in Table 1-1.

Additional support manuals are listed in Table 1-2. The model/serial nameplate is located on the cover.

1.2 GENERAL DESCRIPTION

The unit (Figure 1-1) is of the split system type with the condenser mounted outside the truck body, evaporator mounted in the body, and a Cab Command control center mounted in the driver’s compartment. Two types of compressor drive are available:

D Road operation: the road compressor is located in the engine compartment and is driven by the engine of the vehicle when in operation over--the--road

D Road/Standby version: a second compressor is mounted in the condensing section and is driven by an electric motor when in standby mode.

Table 1-1 Model Chart

1.3 CONDENSING SECTION

The condensing section (see Figure 1-2) contains the condenser fan & coil, filter--drier, oil separator, hot gas solenoid valve, receiver, and a condenser pressure control valve. On road/standby units the condensing section also houses the standby compressor, control box and rectifier and houses the transformer assembly (see Figure 1-2 and Figure 1-5 ).

1.3.1 Condenser/Subcooler

The condenser is of the tube and fin type and acts as a heat exchanger in which the compressed refrigerant gas is condensed into a liquid and lowered in temperature. Air movement over the condenser is provided by a fan mounted in the condensing section.

A portion of the condenser is occupied by the subcooler. Refrigerant leaving the receiver is passed through the subcooler where additional heat is removed. Removal of this additional heat helps to ensure that only liquid refrigerant enters the thermal expansion valve.

1.3.2 Filter Drier

The drier is a cylindrical shell containing a drying agent and screen. It is installed in the liquid line and functions to keep t he system clean and remove moisture from the refrigerant.

R134a

Model No. Description

8002189 Road Only --

8002191

8002193

8002195

Manual Number

Road/Standby

1 15/1/60Hz

Road/Standby

230/1/60Hz

Road/Standby

230/3/60Hz

62--10835 Supra 30S Parts List 62--10847 Supra 30S Easy To Run 62--10849 Supra 30S Operator’s Manual

LB Kg

4 1.8 TM 16

Table 1-2. Additional Support Manuals

Equipment Covered Type of Manual

Compressor

tan

TM 16

Condenser Weight

Road

88 lb

(40 kg)

Road and

Standby

165 lb (75

Evap. Wt.

Kg)

1-1

62-10848

CAB COMMAND

Figure 1-1 Integra 30S

1. Nameplate

2. Condenser Coil

3. Transformer (TR)

4. Oil Separator

5. Standby Motor

6. Standby Compressor (See Table 1-1)

7. Control Box

8. Filter Drier

9. Liquid Line Check Valve

Figure 1-2 Top View

10. Sight Glass 1 1. Receiver

12. Discharge Manifold

13. Hot Gas Solenoid Valve (HGS1)

14. Condenser Pressure Control Switch (HP2)

15. Frame

16. High Pressure Switch (HP1)

17. Condenser Pressure Control Valve (HGS2)

1-262-10848

1. Low Pressure Switch (LP)

2. Expansion Valve (TXV)

3. Quench Valve (BPV)

4. Defrost Termination Thermostat (DTT)

Figure 1-3 Rear View Evaporator

1.3.3 Oil Separator

The oil separator is installed in the discharge line from the road compressor. The hot gas coming from the compressor is forced through a filter which separates the gas from the oil. The oil collects at the bottom after passing through a second filter and then returns to the compressor via a capillary tube.

OIL AND GASFROM COMP.

REFRIGERANT GAS TO COND.

OIL TO COMP.

SUCTION LINE

OIL

Figure 1-4 Oil Separator

1.3.4 Hot Gas Solenoid Valve (HGS1)

HGS1 is normally closed and prevents discharge gas from entering the evaporator. The valve opens to allow hot gas refrigerant to be delivered from the compressor to the evaporator during heat or defrost modes.

5. Evaporator coil

6. Compressor Pressure Regulating Valve (CPR)115V only

1.3.5 Condenser Pressure Control Valve (HGS2)

The condenser pressure control valve (or condenser closing valve) is a normally open valve that is powered when the condenser pressure control switch (HP2) is closed. With the solenoid coil de-energized, the valve is in the cool mode and the compressor discharge gas is delivered to the condenser. In the cool mode, heat is removed from the air inside the truck body and rejected to the surrounding air. With the solenoid coil energized, the valve is in the heat mode and the compressor discharge gas is diverted to the evaporator and rejected to the air inside the truck body.

1.3.6 Compressor

The compressor withdraws refrigerant gas from the evaporator and delivers it to the condenser at an increased pressure. The pressure is such that refrigerant heat can be absorbed by the surrounding air at ordinary temperatures.

1.3.7 Standby Motor

The standby motor operates on nominal 1 15v--1ph--60hz or 208/230v--1ph--60hz or 230v--3ph--60hz power. An overload and short cycle protection is provided along with automatic reset. Units are also equipped with a remote mounted power receptacle.

1.3.8 Receiver

Liquid refrigerant from the condenser is deliver to the receiver. The receiver serves as a liquid reservoir when there are surges due to load changes in the system; as a storage space when pumping down the system and as a liquid seal against the entrance of refrigerant gas into the liquid line.

1-3

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1.3.9 High Pressure Switch (HP1)

HP1 is a normally closed switch which monitors the system for high pressure and shuts down the unit when pressure rises above predetermined setting. For HP1 settings see Section 1.6.2.

1.3.10 Condenser Pressure Control Switch (HP2)

HP2 is a normally open switch which closes to signal the microprocessor to activate the condenser fan. HP2 also cycles the condenser pressure control valve (HGS2) and the quench valve (BPV) in addition to the condenser fan in order to maintain head pressure for heating capacity. For HP2 settings see Section 1.6.2.

1.4 EVAPORATOR SECTION

The evaporator assembly consists of an evaporator fan, evaporator coil, thermostatic expansion valve, defrost termination thermostat, a compressor pressure regulating valve (115V only) and a quench valve.

1.4.1 Thermostatic Expansion Valve

The thermostatic expansion valve is an automatic device which controls the flow of liquid to the evaporator according to changes in superheat to the refrigerant leaving the evaporator. The thermal expansion valve maintains a relatively constant degree of superheat in the gas leaving the evaporator regardless of suction pressure. Thus, the valve has a dual function; automatic expansion control and preventing liquid from returning to the compressor. For TXV superheat settings see Section 1.6.2. To adjust the TXV, refer to Section

4.15.2.

1.4.2 Compressor Pressure Regulating Valve (CPR) (115V Only) (See Figure 1-3)

The CPR valve is installed on the suction line of the standby compressor to regulate the suction pressure entering the compressor. The CPR valve is set to limit the maximum suction pressure. For CPR settings refer to section 1.6.2.

The suction pressure is controlled to avoid overloading the electric motor during high box temperature operation. To adjust the CPR valve, refer to section 4.17

1.4.3 Defrost Termination Thermostat (DTT)

Normally closed thermal switch on Standby units only. As evaporator cools to setpoint, the switch closes and signals microprocessor that defrost may be initiated. Switch terminates defrost by opening at predetermined setpoint. For DTT settings refer to section 1.6.2.

1.4.4 Quench Valve (BPV)

The quench valve is a normally closed solenoid valve controlled by the quench thermostat (BPT) mounted on the road compressor discharge line. The valve allows metered liquid refrigerant to enter the suction line in the evaporator in order to provide compressor cooling. For BPT settings refer to section 1.6.2.

1.4.5 Evaporator

The evaporator is of the tube and fin type. The operation of the compressor maintains a reduced pressure within the coil. At this reduced pressure, the liquid refrigerant evaporates at a temperature sufficiently low enough to absorb heat from the air. Air movement over the evaporator is provided by an electric fan.

1.4.6 Low Pressure Switch (LP)

The low pressure switch is a normally closed switch which signals the microprocessor to shut down the unit when the system is outside the low pressure limit. For LP settings refer to section 1.6.2.

1-462-10848

115/1/60

1. Standby clutch fuse (F2) -- 30 Amp

2. Standby Fuse (F3) -- 5 Amp

3. Transformer Fuse (F4) -- 5 Amp

4. Clutch Time Delay Relay (CT) -- Single Phase Only

5. Clutch Relay (CR)

6. Motor Contactor (MC)

7. Overload Relay (OL) (230V Only)

230/1/60

115/1/60

8. Diode

9. Rectifier Bridge Assembly (BR)

10. Filter Capacitor (C1)

1 1. Start Relay (STBR)

12. Run Capacitor (CR)

13. Start Capacitor (CS)

14. Heat sink (rectifier bridge)

Figure 1-5 Typical Standby Control Box

1-5

62-10848

1. Connector

2. Road Relay (RR)

3. 12 Volt dc Road Connection

4. 12 Volt dc Standby Connection

5. Standby Relay (SR)

Figure 1-6 Standby Microprocessor Module

6. C_ or F_ Temperature Selector

7. Microprocessor (PC)

8. Road Fuse (F1) 30A

9. Overload Relay (OL) 25A (115V Only)

1-662-10848

1. C_ or F_ Temperature Selector

2. Road fuse (25A)

3. + Positive Battery Connection

4. -- Negative Battery Connection

5. --Microprocessor (PC)

Figure 1-7 Road Microprocessor Module

1-7

62-10848

1.5 SYSTEM OPERATING CONTROLS AND COMPONENTS

The unit is furnished with a microprocessor control system. Once the setpoint is entered at the Cab Command, the unit will operate automatically to maintain the desired temperature within very close limits.

WARNING

Beware of unannounced starting of the, standby motor, evaporator fan or condenser fan. The unit may cycle the standby motor or fans unexpectedly as control requirements dictate.

The control system consists of the Cab Command located in the driver’s section (See Figure 1-8) and the microprocessor module (See Figure 1-6) located in the control box.

The Carrier Transicold Control System incorporates the following features:

a. Control return air temperature to tight limits by provid-

ing refrigeration control, heat and defrost to ensure conditioned air delivery to the load.

b. Permanently displays the return air temperature and

on request the setpoint temperature.

c. Digital display and selection of data.

CAUTION

Figure 1-8 Cab Command

1-862-10848

1.6 UNIT SPECIFICATIONS

1.6.1 Compressor Data

Model

Displacement

TM 16

9.9 in

(

162 cm3)

No. Cylinders 6

15.5 lbs

Weight

(7 kg)

Oil Charge 5.07in3(180 cm3)

Approved Oil Mobil Arctic EAL68

1.6.2 Refrigeration System Data

a. Defrost Timer

Automatic triggering or at preset intervals : 0 (Disabled), auto, 1h, 2h, 3h, 4h, 5h, 6h

b. Defrost Termination Thermostat(DTT) (Standby

Only)

Opens at: 48_ ¦ 5_F(9_ ¦ 3_C) Closes at: 37_ ¦ 5_F(3_ ¦ 3_C)

c. High Pressure Switch (HP1)

Cutout at : 355 psig ± 10 PSI (24.5 bars)

Cut-in at : 290 psig ± 10 PSI (20 bars)

d. Condenser Pressure Control Switch (HP2)

Cutout at : 130 psig ± 10 PSI (9 bars)

Cut-in at : 175 psig ± 10 PSI (12 bars)

e. Refrigerant charge

RefertoTable1-1.

f. Compressor Pressure Regulating Valve (CPR)

115V only

19±1 psig (1.3 Bar)

g. Thermostatic Expansion Valve (TXV)

Superheat setting = 4_C(7¦ 1_F) at box temperature of -20_C(0_F).

h. Low Pressure switch (LP)

Cutout at : --13.23 inHG ± 6inHG (-- 0.45 ± 0.2 bar)

Cut-in at : +6.5 psig ± 3 psig (+0.44 ± 0.2 bar)

i. Quench Thermostat (BPT)

Opens at: 248_F (120_C) Closes at: 220_F (104_C)

1-9

62-10848

1.6.3 Electrical Data

ContactorDataVol

ionP

kWHPS

1.5

a. Fan Motors

Evaporator Fan Motor (EFM)

Bearing Lubrication Factory Lubricated Bearing Lubrication Factory Lubricated Horse Power 0.1 kw Operating Amps 10.8 amps Operating Amps 10 amps Speed 2800/3000 rpm Speed 3300 rpm

b. Standby Compressor Speed

1740 rpm -- 60 hz

c. Standby Motor Ratings

age

1 15/1/60 Δ 1 1745 rpm 18.3 132.5

208/1/60 Δ 1

230/1/60 Δ 1

230/3/60 Δ 3 1700 rpm 5.9 40

* MRA = Maximum Rotor Amps LRA = Locked Rotor Amps

Resistance = 9.2Ω

d. Road Compressor Clutch

Amp Draw = 3.75A Resistance = 3.2Ω

e. Hot Gas Solenoid Valve (HGS1) Coil

Amp Draw = 1.33 Amp Resistance = 9.2Ω

f. Condenser Pressure Control Valve (HGS2) Coil

Amp Draw = 1.65 Amp Resistance = 7.3Ω

g. Quench Valve (BPV) Coil

Amp Draw = 1.16 Amp Resistance = 10.3Ω

h. Standby Motor Contactor Coil

Amp Draw = 0.19 Amp Resistance = 60Ω

ype o

onnec

ase

Condenser Fan Motor (CFM)

pee

1690 rpm 9.2 70

1715 rpm 8.5 60

MRA* LRA*

1.6.4 Torque Values

Assembly

Standby compressor platform 40 5.5 Standby motor platform 40 5.5 Standby motor pulley 32 4.5 Evaporator fan motor 13 1.8 Evaporator fan 7 1.0 Condenser - frame 7 1.0 Mounting Bolts 44 to 60 6to8

ft-lb kg-m

1-1062-10848

1.7 SAFETY DEVICES

System components are protected from damage caused by unsafe operating conditions by automatically shutting down the unit when such conditions occur. This is accomplished by the following fuses and safety devices.

Automatic

Unsafe Conditions

Safety Device

restart

with fault

Device setting

cleared

1 Excessive drop in pressure Automatic reset of low

pressure switch (LP)

2 Excessive current draw on all mi-

Electronic relay croprocessor outputs (evaporator and condenser fan)

3 Excessive current draw control

Fuse on electronic board circuit

4 Excessive current draw motor

compressor

5 Excessive current draw evapora-

230 = Overload relay

1 15/1/60 = Circuit Breaker

Electronic relay tor and condenser fan motors

6 Excessive compressor discharge

pressure

7 Excessive current draw standby

Automatic reset of High

pressure switch (HP1)

Fuse F3

(a)

clutch

8 Excessive current draw unit in

Standby fuse F2

(a)

standby operation

9 Excessive current draw unit in

Fuse F1

(b)

road operation

10 Connection error on primary

Fuse F4 and/or F5

(a)

transformer

Cutout : --13.23 inHG

YES

(- 0.45 bar) Timer 5 min

Self-protected opening

YES

Self-protected opening

YES/NONODepending on Selection

See electrical wiring diagram

YES

Self-protected opening

YES Cutout : 355 psig (24.5 bar )

NO Opens at 5 A (12 V)

Opens at 30 A (12 V)

Opens at 4 A

11 Excessive temperature on stand-

by motor bearing

12 Clutch malfunction - road (exces-

sive current draw)

13 Clutch malfunction - road (insuffi-

cient current draw)

14 Double power supply (road +

standby)

Internal Motor Thermostat

(PT0)

Electronic relay

Microprocessor

YES

Self-protected opening

Self-protected opening Opens 311_ F (155° C)

Detection of min. threshold at 750 mA

Display on Cab Command until one of the 2 power supplies have been disconnected.

15 Low battery voltage Microprocessor YES Cutout/cut-in at 10 V

16 Excessive current draw on igni-

tion circuit (Neiman)

Fuse FI

Opens at 1 A

(a) On road / standby unit only (b) This fuse is located close to the vehicle battery (12 v).

1-11

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1.8 REFRIGERANT Circuit

1.8.1 Cooling (See Figure 1 -9)

When cooling, the unit operates as a vapor compression refrigeration system. The main components of the system are the reciprocating compressor, air-cooled condenser, thermostatic expansion valve and the direct expansion evaporator.

The compressor raises the pressure and temperature of the refrigerant and forces it through the discharge check valve and condenser pressure control valve into the condenser tubes. The discharge check valves prevent reverse flow through the non operating compressor.

When operating on the road compressor, the flow also passes through the oil separator where oil is removed and returned to the road compressor.

The condenser fan circulates surrounding air over the outside of the condenser tubes. Heat transfer is thus established from the refrigerant gas (inside the tubes) to the condenser air (flowing over the tubes). The condenser tubes have fins designed to improve the transfer of heat. This removal of heat causes the refrigerant to liquefy. Liquid refrigerant flows from the condenser to the receiver.

The receiver stores the additional charge necessary for low ambient operation and for heating and defrost modes.

The refrigerant leaves the receiver and flows through a manual receiver shut-off valve (king valve).

The refrigerant then flows through a check valve. The check valve serves to prevent reverse flow of refrigerant during the heating/defrost cycle.

The refrigerant then flows through the filter-drier, where an absorbent keeps it dry and clean. The refrigerant then flows though a sight glass. The sight glass is fitted with an indicator that changes color to indicate moisture content of the refrigerant. The refrigerant then flows through the subcooler which removes additional heat from the liquid to improve system efficiency.

The liquid than enters the thermostatic expansion valve (with external pressure equalizer) which regulates the flow rate of refrigerant towards the evaporator in order to obtain maximum use of the evaporator heat transfer surface.

The evaporator tubes have aluminium fins to increase heat transfer; therefore heat is removed from the air circulated through the evaporator. This cold air is circulated throughout the truck to maintain the cargo at the desired temperature.

The transfer of heat from the air to the low temperature liquid refrigerant causes the liquid to vaporize. The vapor at low temperature and is then drawn out by the compressor. From this point, the cycle starts over.

On 115v units the refrigerant then enters the compressor regulating valve (CPR) which regulates refrigerant pressure entering the compressor. The cycle then starts over.

The quench valve opens as required to maintain a maximum discharge temperature. (Refer to section

1.6.2 for settings.)

1.8.2 Heat And Defrost (See Figure 1-10)

When refrigerant vapor is compressed to a high pressure and temperature in a compressor, the mechanical energy necessary to operate the compressor is transferred to the gas as it is being compressed. This energy is referred to as the “heat of compression” and is used as the source of heat during the heating or defrost cycle.

When the microprocessor activates heating or defrost, the hot gas solenoid valve energizes and the condenser pressure control valve energizes, closing the port to the condenser and opening a port which allows heated refrigerant vapor to flow directly to the evaporator coil .

The main difference between heating and defrosting is that when in heating mode the evaporator fans continue to run thus circulating the air throughout the truck to heat the product. When in defrost, the evaporator fans stop, thus allowing the heated vapor to defrost any ice build-up on the coil.

When the pressure is above the setting of the condenser pressure control switch, the condenser pressure control valve (HGS2) is closed to prevent additional pressure rise in the system. When pressure is below the setting of the condenser pressure control switch, the valve is opened to pressurize the receiver and force additional refrigerant into the system and increase heating capacity.

1-1262-10848

QUENCH VALVE (BPV)

SUCTION CHARGING PORT

TXV EQUALIZER LINE

EVAP.

DEFROST ELEMENT

OIL SEPARATOR

TXV

CHECK VALVE

KING VALVE

CPR 115V ONLY

FILTER DRIER/SIGHTGLASS

RECEIVER

HOT GAS SOLENOID VALVE (HGS1)

DISCHARGE CHECK VAL VEMANIFOLD ASSEMBLY

SUBCOOLER

CONDENSER

COND. PRESS. CONTROL VALVE (HGS2)

HP1

DISCHARGE CHARGING PORT

QUENCH THERMOSTAT (BPT)

ROAD COMPRESSOR

HP2

STAND BY COMPRESSOR

DISCHARGE LIQUID LIQUID INJECTION LINE HOT GAS LINE SUCTION LINE

Figure 1-9 Refrigeration Circuit Cooling Cycle

1-13

62-10848

QUENCH VALVE (BPV)

SUCTION CHARGING PORT

TXV EQUALIZER LINE

EVAP.

DEFROST ELEMENT

OIL SEPARATOR

TXV

CHECK VALVE

KING VALVE

HOT GAS SOLENOIDVALVE (HGS1)

CPR 115V ONLY

FILTER DRIER/SIGHTGLASS

RECEIVER

DISCHARGE CHECK VAL VEMANIFOLD ASSEMBLY

SUBCOOLER

CONDENSER

COND. PRESS. CONTROL VALVE (HGS2)

HP1

DISCHARGE CHARGING PORT

QUENCH THERMOSTAT (BPT)

ROAD COMPRESSOR

Figure 1-10 Refrigeration Circuit Heating Cycle

HP2

STAND BY COMPRESSOR

DISCHARGE LIQUID LIQUID INJECTION LINE HOT GAS LINE SUCTION LINE

1-1462-10848

SECTION 2

OPERATION

2.1 CONTROL SYSTEM

2.1.1 Introduction

CAUTION

Under no circumstances should anyone attempt to service the microprocessor module and Cab Command. Should a problem develop with the control system, contact your nearest Carrier Transicold dealer for replacement components.

The Control System consists of the microprocessor module (Figure 1-6), Cab Command (Figure 2-1) and interconnecting wiring.

a. The Microprocessor Module includes the tempera-

ture control software and necessary input/output circuitry to interface with the unit controls.

b. The Cab Command is remotely mounted in the truck.

The Cab Command includes the LCD display and keypad. The keypad and display serve to provide user access and readouts of microprocessor information. The information is accessed by keypad selections and viewed on the display.

1.8.3 Microprocessor Module

The microprocessor controls the following functions: a. Maintains the box temperature at setpoint by regu-

lating the cooling, heat, off mode and automatic defrost cycles.

b. Permanently displays the return air temperature and

on request the setpoint temperature. c. Digital display and selection of data. For further details on digital message display, see

section 2.6.

2.1.2 Cab Command

The Cab Command is mounted in the cab and allows the driver to carry out the control operations:

viewed on the display .

Figure 2-1 Cab Command

Display

The digital display consists of 3 alphanumeric characters. The default value displayed is the box temperature. The microprocessor enables selection of the display in degrees Celsius or Fahrenheit. The display also includes settings for defrost operation (dF). The display also includes three LEDs:

Digital Display

Standby operation LED

Road operation LED

Unit operating LED

D Green : cycling (left-hand side) D Red : malfunction (right-hand side)

• start up and shut-down the unit

• automatic start-up in road or standby mode

• adjust the setpoint

• defrost

The driver can display the box temperature, and see whether the setpoint is being maintained by checking the green indicator. The indicator lights up red in the event of a malfunction.

When the battery voltage is too low, a fail-safe system shuts down the unit. Unit restart is automatic and time-delayed if the voltage rises to the normal level.

The command consists of the display and the keypad. The keypad and display serve to provide user access and readouts of microprocessor information. The information is accessed by keypad selections and

2-1

62-10848

Unit operating LEDs

a. Green Light Status for Standby Units

Under normal operation, the green LED will indicate the temperature control status as follows:

Setpoint + 9°F (5_C)

NULL BAND

Setpoint -- 9°F (5_C)

Figure 2-2 Green Light Status -- Standby

a. Green Light Status for Road Only Units

Under normal operation, the green LED will indicate the temperature control status as follows:

Green LED

flashing 3 Hz

Green LED

flashing 0.5 Hz

Steady

green LED

Steady

green LED

Green LED

flashing 0.5 Hz

Green LED

flashing 3 Hz

Setpoint + differential of

1.8°F(1°C),

3.6°F(2°C) or

5.4°F(3_C)

SETPOINT

Setpoint -differential of

1.8°F(1°C),

3.6°F(2°C) or

5.4°F(3_C)

b. Red Light Status

After an alarm has been present for 15 minutes, the red unit indicating light flashes at 3 Hz. The light will continue to flash at 0.5 Hz until the temperature returns to setpoint ± differential. At that point the steady green indicator light will light and the alarm become inactive.

c. Keypad

The keypad consists of six keys that enable the operator to activate various functions, display operating data and modify operating parameters.

Manual defrost control key

Unit start-up key

Unit shut-down key in standby or road mode

On road operation, the unit can also be shut down with the ignition key.

Unit data and function modification keys

The SET key, together with the + and -keys, enables display and modification of unit operating data.

The display scrolls through parameters each time the SET key is pressed.

Decrease key for selected data

Steady green

LED

NULL BAND

Figure 2-3 Green Light Status -- Road Only

Green LED is

OFF

Green LED

flashing 1 Hz

COOLING

SETPOINT

HEATING

Increase key for selected data

2.2 START--UP

2.2.1 Inspection

Before starting the truck engine or connecting standby power check the following

a. Check condenser coil for cleanliness b. Check condition of refrigerant hoses

c. Check condition and tension of compressor belt(s) d. Check condition of condenser fan blade, motor and

brushes e. Check truck battery fluid level

f. Check truck battery and terminal connections -- clean

and tighten as necessary

g. Check defrost water drains from evaporator h. Check evaporator coil for cleanliness

i. Check condition of evaporator fan blades, motor and

brushes

j. Check oil level in standby compressor sight glass

62-10848

2-2

2.2.2 Connect Power

If the unit is to be operated in the standby mode, connect power as follows:

WARNING

Do not attempt to connect or remove power plug before ensuring the unit is OFF (press OFF key on Cab Command) and external power circuit breaker is open.

2.3 SETPOINT ADJUSTMENT

It is possible to increase or decrease the setpoint by whole numbers until the required setpoint is displayed. If display stays highlighted, the setpoint displayed has not been validated.

The new setting for the setpoint is validated by pressing the SET key.

Displays the setpoint temperature

WARNING

Make sure the power plug is clean and dry before connecting to any power source

a. Check that the external power source corresponds to

the characteristics of the unit (see paragraph 1.6.3 step c.). Make sure external power source circuit breaker is open.

b. Make sure unit is OFF by pressing the OFF button on

the Cab Command.

c. Plug the power cord into unit receptacle.

2.2.3 Starting

CAUTION

If starting uni t for the first time after installation the compressor pressure regulating valve will need to be reset (refer to paragraph 4.14)

CAUTION

If starting uni t for the first time after installation or optional feature or rameters have changed the Configuration will need to be reset (refer to paragraph 2.9)

Depending on desired mode of operation, either start the vehicle engine or close the power source circuit breaker.

starting after adding/removing an

if Owners operating pa-

Decrease the setpoint

Increase the setpoint

Validate setpoint temperature Return to display of box temperature.

2.4 MANUAL DEFROST

Check that box temperature is 40°F(4.4°C) or lower.

Press manual defrost key to initiate manual defrost.

2.5 DEFROST CYCLE ADJUSTMENT

Defrost parameters may be set to eliminate defrost, decrease the time between defrosts, allow full automatic defrost, increase the time between defrosts or set a forced interval between defrosts. To adjust the defrost cycle, do the following:

Shut-down unit.

Display parameters.

Modify parameters.

Press the ON key to start the unit

(For Standby units, start up is time delayed for 10 seconds. For Road units, start up is time delayed for 40 seconds.)

The digital display of the Cab Command displays the box temperature.

Check that temperature setpoint is correct by pressing the SET key. The setpoint temperature is highlighted on the digital display.

2-3

Validate modified settings Return to display of box

temperature.

NOTE

If no key is pressed within 5 seconds of adjusting settings the system reverts to displaying the box temperature. Only validated changes are recorded.

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2.6 ALARM DISPLAY

In the event of a malfunction the unit will shut down and the Cab Command will display an error message or alarm message. The message will remain displayed until the malfunction is corrected. If standby power is connected and the malfunction is such that standby operation can be allowed, the unit will start in the standby mode. A listing of the error messages and alarm codes is provided in Table 2-1.

Table 2-1 Alarms For Road Only Units

Malfunction

Codes

A00

A01 A02 A04 A06 A07 A09 A10 A11

A15

BAT

Err

Red LED flashes No malfunction. Unit in operation.

High or Low pressure switch X

Road clutch malfunction X

Condenser fan motor fault X

Evaporator fan motor fault X

Hot gas solenoid valve malfunction (HGS1) X

Quench valve malfunction (BPV) X

Condenser pressure control valve (HGS2) X

Setpoint adjusted out of the range --20.2 to 86°F(--29°C/+30°C) or below the programmed low threshold

Low battery voltage X

Probe malfunction or evaporator temperature out of limits [--49° to 174°F(--45° to 79°C)]

Programming error on part of operator X

Description

2.6.1 Accessing Alarm Messages

To access the alarm messages:

Press SET for 5 seconds : enables access to alarm messages.

In the event of more than one alarm, press the + or -- keys to list them.

ALARM

ONLY

ALARM AND UNIT SHUT

DOWN

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2-4

Malfunction

Codes

A00

A01

A02

A03

A04 A05 A06 A07 A08 A09 A10

A11 A12 A13 A14

A15

BAT

Err

Table 2-2 Alarms For Standby Units

Description

Red LED flashes No malfunction. Unit in operation.

Low pressure switch

High pressure switch

Electric motor overload protection on start-up

Road clutch malfunction X

Standby clutch and contactor X

Condenser fan motor fault X

Evaporator fan motor fault X

Heating option command X

Hot gas valve malfunction (HGS1) X

Quench valve malfunction (BPV) X

Condenser pressure control valve (HGS2) X

High temperature alarm X

Low temperature alarm X

Defrost alarm > 45 minutes X

Setpoint adjusted out of the range --20.2 to 86°F(--29°C/+30°C) or below the programmed minimum setpoint

Low battery voltage X SEE SECTION 2.6.2

Probe malfunction or evaporator temperature out of limits [--49° to 174°F(--45° to 79°C)]

Programming error on part of operator X

ALARM

ONLY

ALARM AND UNIT SHUT

DOWN

X -- AFT ER 3 SUCCESSIVE

FAULTS

X -- AFT ER 5 SUCCESSIVE

FAULTS

X -- AFT ER 3 SUCCESSIVE

FAULTS

2.6.2 Low Battery Voltage Alarm for Road Only Units

There is a 40 second time delay during start--up. After this delay if the battery voltage drops below 10V ±0.2V for Standby units or 10.5V ±0.5V for Road only units, the microprocessor will react 20 seconds later and the unit will go out of temperature control mode. The microprocessor will check the voltage after another 20 seconds. If battery voltage still has not risen, the unit will remain out of temperature control mode for another 10 minutes, and the battery alarm will be activated and the Cab Command will display the message “bAt”. Unit will return to temperature control mode if battery voltage has risen after 10 minutes. If the battery voltage has not risen after this 10 minute period the unit will remain out of temperature control mode another 2 minutes and the microprocessor will check the battery voltage every 2 minutes. Unit will return to temperature control mode in its current configuration when battery voltage rises to 10V ±0.2V for Standby units or 10.5V ±0.5V for Road only units.

2.6.3 Clearing Alarm Messages

The alarm list provides information on current alarms and past alarms which may be helpful in trouble shooting unit problems. Once all the alarm information

has been noted and service is complete, the alarm list may be cleared. To clear the alarm messages:

Press the ON, the + and

the -- keys at the same time.

2.7 CHECKING THE EEPROM VERSION

Start up unit

Press the SET key to display eeprom version number.

Press SET key to return to box temperature.

2.8 STOPPING THE UNIT

Press the OFF key or turn the ignition key to off position.

2-5

62-10848

2.9 MICROPROCESSOR CONFIGURATION

CAUTION

6 hours) using the (+) or (--) keys. Selection MUST be validated by pressing the SET key.

3. The next steps must be performed with the unit ON:

If starting uni t for the first time after installation or optional feature or rameters have changed, the Configuration will need to be reset.

2.9.1 ROAD ONLY FUNCTIONAL SETTINGS

The procedure for adjusting the functional parameters is as follows:

1. The temperature display is selectable between Fahrenheit and Celsius. Units are configured for Celsius from the factory. To set the display to Fahrenheit, the selection jumper must be removed and discarded. SeeFigure1-6.

The board contains another set of pins similar to the Degrees C/Degrees F selection jumper, marked as J1. This jumper is not used for unit operation, but it is used during the microprocessor controller manufacturing process. DO NOT

CONNECT THE J1 PINS TOGETHER.

2. The following steps must be performed with the unit OFF:

If no buttons are depressed within 5 seconds of pressing the Defrost and On Keys (Step 2 of the above procedure) or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted.

starting after adding/removing an

if Owners operating pa-

NOTE

Shut-down unit.

Hold both keys

THEN

momentarily in order to display parameters.

Modify parameters. (See a. and b. below)

Validate modified settings.

NOTE

Unit start-up

Press the +, then -- then

THEN THEN

If no buttons are depressed within 5 seconds of pressing the ON key or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted.

a. The minimum setpoint parameter is displayed. The

minimum setpoint can be selected by scrolling through available options [--20°F (--28.9°C), --4°F (-- 20°C), 32°F(0°C)] using the (+) or (--) keys. Factory setting is --20°F . Selection MUST be validated by pressing the SET key.

b. The null mode differential temperature is displayed

next. This setting determines the temperature difference between box temperature and setpoint that controls compressor cycling. The differential can be selected by scrolling through available options [1.8°F (1°C), 3.6°F(2°C), or 5.4°F(3°C)] using the (+) or (--) keys. Factory setting is 3.6°F(2°C). Selection MUST be validated by pressing the SET key.

c. The ON/OFF (Continuous airflow) parameter for the

evaporator fan is displayed next. This feature determines whether the evaporator fan is on or off when the unit cycles off upon reaching setpoint. The factory setting is OFF. Change setting by using the (+) or (--) keys. Selection MUST be validated by pressing the SET key.

d. The return air temperature will be displayed after the

above sequence.

DEFROST keys. All keys should be held momentarily after pressing in the correct sequence.

Modify parameters. (See a., b. and c. below)

NOTE

a. The defrost duration parameter is displayed. This set-

ting determines the length of time in minutes the unit will remain in defrost once defrost is initiated. The defrost duration can be selected by scrolling through available options (10, 20, 25, 30 or 45 minutes) using the (+) or (--) keys. Selection MUST be validated by pressing the SET key.

b. The defrost interval parameter is displayed next. This

setting determines the time between defrosts in hours. The defrost interval can be selected by scrolling through available options (0, 1, 1.5, 2, 2.5, 3, 4, 5,

62-10848

2-6

2.9.2 ROAD/STANDBY FUNCTIONAL SETTINGS

The procedure for adjusting the functional parameters is as follows:

1. The temperature display is selectable between Fahrenheit and Celsius. Units are configured for Celsius from the factory. To set the display to Fahrenheit, move the Celsius end of the jumper to the Fahrenheit pin as shown in Figure 2-4.

Unit start-up

Press the +, then -- then

THEN THEN

Keys must be pressed before the unit starts.

DEFROST keys. All keys should be held momentarily after pressing in the correct sequence.

Modify parameters. (See a., b., c. and d. below)

NOTE

Figure 2-4 Temperature Selection Jumper

NOTE

CONNECT THE J1 PINS TOGETHER.

2. The following steps must be performed with the unit OFF:

Shut-down unit.

Hold both keys

THEN

a. The defrost interval parameter is displayed. This set-

ting determines the time between defrosts in hours. The defrost interval can be selected by scrolling through available options. Settings are for either automatic defrost (AUT) or fixed time intervals between 1 to 6 hours. The setting can be selected by pressing the (+) or (--) keys. Selection MUST be validated by pressing the SET key.

The next steps must be performed with the unit ON:

momentarily in order to display parameters.

Modify parameters. (See a. and b. below)

Validate modified settings.

NOTE

If no buttons are depressed within 5 seconds of pressing the ON key or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted.

a. The minimum setpoint parameter is displayed. The

b. The null mode differential temperature is displayed

c. The ON/OFF (Continuous airflow) parameter for the

d. The 2ET or 3ET parameter is now displayed. This

feature determines heating mode operation based on the presence of a condenser pressure control valve. Since all 30S units covered by this manual have a condenser pressure control valve installed, 3ET must be selected. This enables cooling, null, and heating modes of operation. Selection MUST be validated by pressing the SET key. Change setting by using the (+) or (--) keys. Selection MUST be validated by pressing the SET key.

WARNING

2-7

62-10848

SECTION 3

TEMPERATURE CONTROL

3.1 SEQUENCE OF OPERATION

General operation sequences for cooling, null, and heating are provided in the following paragraphs. The microprocessor automatically selects the mode necessary to maintain box temperature at setpoint.

3.1.1 Perishable Mode

The unit operates in the perishable mode with set points above 10°F(--12°C)

a. With return air temperature above setpoint and de-

creasing, the unit will be cooling with the compressor and evaporator fans operating. (See Section 1.8.1 for a description of the refrigeration circuit during cooling) The condenser fan will operate for the first three minutes after start up then operate under the control of the condenser pressure control switch (HP2). The green unit operating LED will operate in accordance with Figure 2-2 or Figure 2-3.

b. If discharge temperature increases to the setpoint of

the quench thermostat (BPT), the thermostat will close, energizing the quench valve (BPV). This will allow liquid into the suction line in order to cool compressor. Once the discharge temperature decreases to the certainty of the PPT, the thermostat will open, DE--energizing the PP.

COOL

+1.8_F(+1_C)

or +3.6_F(+2_C)

or +5.4_F(+3_C)

UNIT STOPPED

HEAT

SETPOINT

-- 1 . 8 _F(--1_C)

or --3.6_F(--2_C)

or --5.4_F(--3_C)

(setting)

Figure 3-1 Operating Sequence -- Perishable

Mode

3.1.2 Frozen Mode

The unit operates in the frozen mode with setpoints at or below 10°F(--12°C). Operation in the frozen mode is the same as in the perishable mode except no heating takes place.

c. Once temperature decreases to the certainty, the unit

will enter the null mode. If the continuous air flow parameter is set to ON, the evaporator fans will continue to operate with all other components OFF. If the continuous air flow parameter is OFF, the evaporator fans and all other components will be OFF. A 5 minute delay is required before restart is allowed.

d. If temperature increases during the null mode, the

unit will restart in cooling.

e. If temperature continues to decrease the unit will en-

ter the heating mode with the compressor and evaporator fans operating and the hot gas solenoid valve (HGS1) energized (open). The condenser fan and condenser pressure control valve (HGS2) will operate under the control of the condenser pressure switch (HP2). If the engine coolant or electric heat option is installed, the optional heaters will also be energized. (See Section 1.8.2 for a description of the refrigeration circuit during heat and defrost.)

+1.8_F(+1_C)

COOL

UNIT STOPPED

or +3.6_F(+2_C)

or +5.4_F(+3_C)

SETPOINT

-- 1 . 8 _F(--1_C)

or --3.6_F(--2_C)

or --5.4_F(--3_C)

(setting)

Figure 3-2 Operating Sequence -- Frozen Mode

3-1

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3.2 DEFROST CYCLE

Defrost is an independent cycle overriding cooling and heating functions in order to melt frost and ice from the evaporator when necessary. Defrost may be initiated by the microprocessor or manually by the operator once the defrost termination thermostat has closed. (See Section 1.6.2 for settings). In defrost mode, the microprocessor displays “dF” on the cab command and setpoint is no longer displayed.

During defrost, the evaporator fans shut down and operation of the condenser fan is controlled by the microprocessor. The end of the cycle is controlled by the opening of the defrost termination thermostat. (See Section 1.8.2 for a description of the refrigeration circuit during heat and defrost.)

3.3 MINIMUM OFF TIME

Once the unit has cycled off, it will remain off for the minimum off time of 5 minutes. This prevents the unit from rapid cycling due to changes in air temperature. Air temperature in the box changes rapidly but it takes time for the product temperature to change.

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3-2

SECTION 4

4.Checktheoperationofcabcom

SERVICE

WARNING

CAUTION

Compressor failure will occur if inert gas brazing procedures are not used on units with R134A and POE oil. For more information see Technical Procedure 98-50553-00 -- Inert Gas Brazing.

NOTE

To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing refrigerant. When working with refrigerants you must comply with all local government environmental laws, U.S.A. EPA section 608.

4.1 MAINTENANCE SCHEDULE

Regular servicing is required in order to optimize the life and reliability of your unit. The recommended scheduled maintenance intervals and categories are provided in Table 4-1 while descriptions of the service procedures to be carried out under each category are provided in Table 4-2

Table 4-1 Maintenance Schedules

Kilometers

Miles

Service A

Service B

Service C

Service D

000300006000090000

0001800036000540007200090000

J J J J J J J J

J J J J J J J

J J J

120 000

150 000

180 000

108 000

210 000

126 000

Refrigerant : Type R134a. Road compressor oil type: The road compressorsare

supplied with CARRIER POLYESTER (POE) oil. Oils of PAG ty p e are strictly incompatible with the operation of this unit, never use an oil other than that approved

by CARRIER.

Table 4-2 Service Category Descriptions

Service A

1. Check the tension of the compressor belt(s). 2 .Check that the vehicle engine idles correctly with unit operating. Check compressor mounting hardware and belt tension. (Paragraph 4.2) 3 .Check the tightness of bolts and screws and that the unit is correctly fastened onto the box.

Service B 1 . Clean evaporator & condenser.

(Paragraphs 4.18 & 4.19)

2. Replace the road and standby compressor belt(s).

3. Check and if required replace the filter-drier. (Paragraph 4.10)

mand.

5. Check the defrost

DCut-in DFan shut-down DCut-out DDefrost water drain

Service C 1. Check the operation of the evapora-

tor and condenser fans. Change the condenser/evaporator motor brushes.

2. Change the compressor oil. Use polyester oil (POE) approved by CARRIER. Refer to paragraph 1.6.1.

Service D 1. Change the removable relays, fuses

and capacitor (if any) in the control box.

4-1

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4.2 BELT MAINTENANCE AND ADJUSTMENT

Table 4-3. Belt Tension (See Figure 4-2)

WARNING

Beware of V- belt and belt-driven components as the unit may start automatically.

A belt tension gauge provides an accurate and easy method of adjusting belts to their proper tension. Properly adjusted belts give long lasting and efficient service. Too much tension shortens belt and bearing life, and too little tension causes slippage and excessive belt wear. It is also important to keep belts and sheaves free of any foreign material which may cause the belts to slip.

The Belt Tension gauge can be used to adjust all belts. The readings which we specify for Carrier Transicold units are applicable only for our belts and application, as the tension is dependent on the size of the belt and distance between sheaves. When using this gauge, it should be placed as close as possible to the midpoint between two sheaves.

BELTS

Standby Motor to Compressor

4.2.1 Standby Motor--Compressor V-Belt

a. Loosen the retaining bolts of the standby motor sup-

port plate.

b. Replace the V-belt. Position the motor to correct belt

tension. Tighten the motor retaining bolts.

4.3 INSTALLING R-134A MANIFOLD GUAGE SET

A R-134a manifold gauge/hose set with self-sealing hoses is required for service of models covered within this manual. The manifold gauge/hose set is available from Carrier Transicold. (Carrier Transicold P/N 07-00294-00, which includes items 1 through 6, Figure 4-3). To perform service using the manifold gauge/hose set, do the following:

4.3.1 Preparing Manifold Gauge/Hose Set For Use

a. If the manifold gauge/hose set is new or was

exposed to the atmosphere it will need to be evacuated to remove contaminants and air as follows:

New Install

Ten sion

90 ft./lbs

(122 Nm)

Running

Ten sion

80 to 90 ft./lbs

(108 to 122

Nm)

Figure 4-1 Belt Tension Gauge

(Carrier Part Number 07--00203--00)

Belt tension depends on each kit. Refer to Installation Instructions provided with the kit for belt tension requirements. In each kit installation instruction, we indicate the belt tension (given with belt tension gauge P/N 07-00203-00.

When installing a new V-belt the tension should be somewhat higher than specified and readjusted after allowing the unit to run for some time.

Standby

motor

1. Standby Motor-Compressor V-belt

Compressor

b. Back seat (turn counterclockwise ) both field service

couplers (see Figure 4-3) and midseat both hand valves.

c. Connect the yellow hose to a vacuum pump and an

R-134a cylinder.

d. Evacuate to 10 inHg (254mmHg) and then charge

with R-134a to a slightly positive pressure of 1.0 psig (0.07 Bar).

e. Front seat both manifold gauge set hand valves and

disconnect from cylinder. The gauge set is now ready for use.

4.3.2 Connecting Manifold Gauge/Hose Set

To connect the manifold gauge/hose set for reading pressures, do the following:

a. Remove service valve stem cap and check to make

sure it is backseated. Remove access valve cap.

b. Connect the field service coupler (see Figure 4-3) to

the access valve.

c. Turn the field service coupling knob clockwise, which

will open the system to the gauge set.

d. Read system pressures.

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Figure 4-2 Layout of V-belt

e. Repeat the procedure to connect the other side of

the gauge set.

4-2

4.3.3 Removing the Manifold Gauge Set

1. While the compressor is still ON, backseat the high

side service valve.

2. Midseat both hand valves on the manifold gauge set

and allow the pressure in the manifold gauge set to be drawn down to low side pressure. This returns any liquid that may be in the high side hose to the system.

CAUTION

To prevent trapping liquid refrigerant in the manifold gauge set be sure set is brought to suction pressure before disconnecting.

3. Backseat the low side service valve. Backseat both

field service couplers and frontseat both manifold set hand valves. Remove the couplers from the access valves.

4. Install both service valve stem caps and access

valve caps (finger-tight only).

Low Pressure

Gauge

High Pressure

Gauge

4.4 REMOVING THE REFRIGERANT CHARGE

NOTE

To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing refrigerant.

Connect a refrigerant recovery system (Carrier P/N M V S -- 1 1 5 -- F -- L -- C T ( 1 1 5 V ) o r M V S -- 2 4 0 -- F -- L -- C T (240V) ) to the unit to remove refrigerant charge. Refer to instructions provided by the manufacturer of the refrigerant recovery system.

4.4.1 Refrigerant Removal From A Non --Working Compressor.

To remove the refrigerant from a compressor that is not operational, do the following:

a. Attach a manifold gauge set as shown in Figure 4-3

b. Recover refrigerant with a refrigerant recovery sys-

tem.

c. Service or replace components as required and leak

check the entire system. (See Section 4.5).

4.5 REFRIGERANT LEAK CHECKING

Opened (Backseated ) Hand Valve

To Low Side Access Valve

BLUE

(Blue Knob)

1. Manifold Gauge Set

2. Hose Fitting (0.5-16 Acme)

3. Refrigeration and/or Evacuation Hose . (SAE J2196/R-134a)

4. Hose Fitting w/O-ring (M14 x 1.5)

5. High Side Field Service Coupler

6. Low Side Field Service Coupler

Figure 4-3 Manifold Gauge Set (R-134a)

RED

YELLOW

Closed (Frontseated) Hand Valve

To High Side Access Valve

(Red Knob)

A refrigerant leak check should always be performed after the system has been opened to replace or repair a component. To check for leaks in the refrigeration system, perform the following procedure:

NOTE

Use only R134a to pressurize the system. Any other gas or vapor will contaminate the system which will require additional purging and evacuation of t he high side (discharge) of the system.

a. If system is without refrigerant, charge system with

refrigerant to build up pressure between 30 to 50 psig (2 to 3.4 Bars). Remove refrigerant cylinder and leak check all connections.

b. Add sufficient nitrogen to raise system pressure to

150 to 200 psig (10.21 to 13.61 bar).

c. Check for leaks. The recommended procedure for

finding leaks in a system is with an electronic leak detector. (Carrier P/N 07--00295--00). Testing joints with soap suds is satisfactory for locating large leaks but be necessary when an electronic leak detector will not function correctly.

d. Remove refrigerant using a refrigerant recovery sys-

tem and repair any leaks. Evacuate and dehydrate the unit. (Refer to section 4.6) Charge unit with refrigerant. (Refer to section 4.7)

4-3

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4.6 EV ACUATION AND DEHYDRATION

4.6.1 General

Moisture can seriously damage refrigerant systems. The presence of moisture in a refrigeration system can have many undesirable effects. The most common are copper plating, acid sludge formation, “freezing-up” of metering devices by free water, and formation of acids, resulting in metal corrosion.

4.6.2 Preparation

a. Evacuate and dehydrate only after pressure leak test.

(Refer to section 4.5)

b. Essential tools to properly evacuate and dehydrate

any system include a good vacuum pump (5 cfm = 8m#H volume displacement, P/N 07-00176-01) and a good vacuum indicator such as a thermocouple vacu-

um gauge (vacuum indicator). (Carrier P/N 0700414--00).

NOTE

Use of a compound gauge is not recommended because of its inherent inaccuracy.

c. Keep the ambient temperature above 60_F (15.6_C)

to speed evaporation of moisture. If ambient temperature is lower than 60_F (15.6_C), ice might form before moisture removal is complete. Heat lamps or alternate sources of heat may be used to raise system temperature.

d. Additional time may be saved during a complete sys-

tem pump down by replacing the filter--drier with a section of copper tubing and the appropriate fittings. Installation of a new filter--drier may be performed during the charging procedure.

1 Refrigerant Recovery Unit 2 Refrigerant Cylinder 3 Evacuation Manifold

4.6.3 Procedure For Evacuation And Dehydrating System

a. Remove refrigerant using a refrigerant recovery sys-

tem.

b. The recommended method to evacuate and dehy-

drate the system is to connect three evacuation hoses (Do not use standard service hoses, as they are not suited for evacuation purposes.) as shown in Figure 4-4 to the vacuum pump and refrigeration unit.

4Valve 5 V acuum Pump 6 Electronic Vacuum Gauge

Figure 4-4 Vacuum Pump Connection

c.Connect lines to unit and manifold and make sure vac-

Also, as shown, connect a evacuation manifold, with evacuation hoses only, to the vacuum pump, electronic vacuum gauge, and refrigerant recovery system.

uum gauge valve is closed and vacuum pump valve is open.

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4-4

d. Start vacuum pump. Slowly open valves halfway and

then open vacuum gauge valve.

e. Evacuate unit until the electronic vacuum gauge indi-

cates 2000 microns. Close the electronic vacuum gauge and vacuum pump valves. Shut off the vacuum pump. Wait a few minutes to be sure the vacuum holds.

f. Break the vacuum with clean dry nitrogen. Raise sys-

tem pressure to approximately 2 psig (0.14 Bar). g. Purge nitrogen from system. h. Repeat steps e through g one time. i. Evacuate unit to 500 microns. Close off vacuum

pump valve and stop pump. Wait five minutes to see if

vacuum holds. This checks for residual moisture and/

or leaks. j. With a vacuum still in the unit, the refrigerant charge

may be drawn into the system from a refrigerant con-

tainer on a scale. The correct amount of refrigerant

may be added by observing the scale. (Refer to sec-

tion 4.7)

4.7 CHARGING THE REFRIGERATION SYSTEM

4.7.1 Checking The Refrigerant Charge

a. Start unit in cooling mode and run approximately ten

minutes. b. Partially block off air flow to condenser coil so dis-

charge pressure rises to 174 psig (12 Bars). c. The unit is correctly charged when there are no

bubbles in the sight glass.

4.7.2 Installing A Complete Charge

g. Start unit and check for non--condensables.

4.7.3 Adding A Partial Charge

NOTE

When partially charging the refrigeration system with R134a, install a vapor charge.

a. Place refrigerant cylinder on scale and connect

charging line between suction port and refrigerant cylinder.

b. Note weight of refrigerant cylinder.

c. Run unit on high speed cool and open cylinder vapor

valve.

d. If necessary, partially block off air flow to condenser

coil so discharge pressure rises to 174 psig (12 Bars).

e. The unit is correctly charged when there are no

bubbles in the sight glass.

f. Start unit and check for non--condensables.

NOTE

It may be necessary to finish charging the unit using the partial charge method, due to pressure rise in the high side of the system. (Refer to paragraph 4.7.3)

a. Dehydrate unit and leave in deep vacuum. (Refer to

section 4.6) b. Place refrigerant cylinder on scale and connect

charging line from cylinder to receiver outlet (king)

valve. Purge charging line at outlet valve. c. Note weight of refrigerant cylinder. d. Open liquid valve on refrigerant cylinder. Open king

valve half way and allow the liquid refrigerant to flow

into the unit until the correct weight of refrigerant has

been added as indicated by scale. Correct charge will

be found in Table 1-1.

NOTE

It is possible that all liquid may not be pulled into the receiver, as outlined in step d. above. In this case, vapor charge remaining refrigerant through the suction service port (See Section

4.7.3).

e. When refrigerant cylinder scale indicates that the cor-

rect charge has been added, close liquid line valve on

cylinder and backseat the king valve. f. Replace all valve caps.

4.8 CHECKING FOR NON--CONDENSABLES

To check for non--condensables, proceed as follows:

a. Stabilize system to equalize pressure between the

suction and discharge side of the system.

b. Check temperature at the condenser and receiver.

c. Check pressure at the receiver outlet (King) valve.

d. Check saturation pressure as it corresponds to the

condenser/receiver temperature using the Temperature-Pressure Chart, Table 4-4.

e. If gauge reading is 3 psig (0.2 Bar) or more than the

calculated P/T pressure in step d., non--condensables are present.

f. Remove refrigerant using a refrigerant recovery sys-

tem. (Refer to section 4.4)

g. Evacuate and dehydrate the system. (Refer to sec-

tion 4.6.)

h. Charge the unit. (Refer to section 4.7.)

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4.9 REPLACING THE COMPRESSOR

4.10 CHECKING AND REPLACING FILTER-DRIER

4.9.1 Removing Compressor

WARNING

Ensure power to the unit is OFF, power plug is disconnected and circuit breaker is open or vehicle engine is OFF and negative battery cable is connected before replacing compressor.

a.Remove the refrigerant. (See Section 4.4.1).

WARNING

Slowly open the plug on the suction and discharge valves of the new compressor to vent the nitrogen holding charge.

b. Remove bolts from flanges.

c. Release and remove belt.

4.10.1 Checking Filter-Drier

Check for any obstruction of the filter-drier by feeling the inlet and outlet connections of the liquid line on the filter cartridge. If the temperature of the outlet connection seems lower than the temperature of the inlet connection, replace the filter-drier.

4.10.2 Replacing The Filter-Drier

Remove refrigerant charge (See section 4.4). Remove the drier mounting clip, then replace the filter-drier. Following drier replacement, evacuate and recharge unit (refer to sections 4.6 & 4.7).

4.11 HIGH PRESSURE (HP1) AND CONDENSER PRESSURE (HP2) SWITCHES

4.11.1 Removing Switch

a. A SCHRAEDER valve is located under each switch to

allow removal and installation without removing the refrigerant charge.

b. Remove switch and test in accordance with para-

graph 4.11.2.

c. Replace or reinstall switch.

4.11.2 Checking Pressure Switch

d. Remove the bolts mounting the compressor. Re-

move the compressor from chassis.

e. Remove the pulley from the compressor.

4.9.2 Installing Compressor

a.. To install the compressor, reverse the procedure out-

lined when removing the compressor. Refer to section 1.6.4 for torque values.

NOTE

The service replacement compressor is sold without flanges.

b. Pump down the compressor. (See Section 4.4)

c. Charge compressor. (See Section 4.7.2)

NOTE

It is important to check the compressor oil level of the new compressor and fill if necessary. (Refer to section 1.6.1)

d. Check refrigerant cycles.

Compressor oil type: The road compressors are supplied with CARRIER PO LYESTER (POE) oil. Ensure compressor is marked with a factory sticker indicating the correct oil has been installed. Oils of PAG type are strictly incompatible with the operation of this unit, never use an oil other than that approved by

CARRIER.

WARNING

a. Remove switch as outlined in paragraph 4.11.1.

b. Connect ohmmeter across switch terminals. Ohm-

meter will indicate resistance if switch is closed (HP1) or open (HP2) after relieving pressure.

b. Connect switch to a cylinder of dry nitrogen (see

Figure 4-5).

c. Set nitrogen pressure regulator higher than cut-out

point on switch being tested. Pressure switch settings points are provided in paragraph 1.6.2.

d. Close valve on cylinder and open bleed-off valve.

e. Open cylinder valve. While observing meter, slowly

close bleed-off valve and increase pressure until the switch opens (HP1) or closes (HP2). Slowly open bleed-off valve (to decrease pressure) until switch reverts to normal position.

f. The meter will indicate open. Open pressure on

gauge. Slowly open bleed-off valve (to decrease pressure) until switch closes (ohmmeter will move).

g. If switch does not activate within tolerances provided,

replace switch. Test new switch before installation.

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4-6

1. Cylinder valve and gauge

2. Pressure regulator

3. Nitrogen cylinder

4. Pressure gauge (0 to 400 psig = 0 to 28 bars)

5. Bleed-off valve

6. 1/4 inch connection

Figure 4-5 Typical Setup For Testing Pressure

Switches HP1 And HP2

paper. Wipe out any accumulation of greasy material using a clean rag dampened with solvent. Reassemble the motor. Install new brushes and replace cap.

4.13 HOT GAS (HGS1) AND CONDENSER PRESSURE CONTROL SOLENOID VALVES

4.13.1 Replacing Solenoid Coil

It is not necessary to remove the refrigerant charge to replace the coil (see Figure 4-7).

a. Remove coil snap cap, voltage plate and coil assem-

bly. Disconnect leads and remove coil junction box if necessary.

b. Verify coil type, voltage and frequency. This informa-

tion appears on the coil voltage plate and the coil housing.

c. Place new coil over enclosing tube and then install

voltage plate and snap cap.

4.12 CHECKING AND REPLACING CONDENSER FAN MOTOR BRUSHES

To maintain proper operation of the fan motors, the fan motor commutator and brushes should be checked periodically for cleanliness and wear .

1. Brush Cap 2. Brush

Figure 4-6 Fan Motor Brushes

To check brushes proceed as follows :

a. With unit off and battery disconnected, remove brush

cap (Item 1 ; 2 per motor). See Figure 4-6

b. Remove brushes (Item 2; 2 per motor) and check the

length of the brush. If the length is less than 1/4 inch (6 mm) the brushes should be replaced.

c. Blow out the brush holder with low pressure air to re-

move any carbon dust in the holder. This dust could prevent a good contact between the brushes and commutator.

d. Remove the back cover of the motor and inspect the

commutator. If the commutator is heavily grooved, polish it using fine sandpaper. Do not use abrasive

1. Snap cap

2. Voltage plate

3. Coil assembly

4. Enclosing tube

Figure 4-7 Hot Gas or Condenser Pressure

Control Solenoid

4.13.2 Replacing Valve Internal Parts

a. Remove the refrigerant charge. (See Section 4.4). b. Remove coil snap cap, voltage cover and coil assem-

bly. Remove the enclosing tube. c. Check for foreign material in valve body. d. Check for damaged plunger and o-ring. If o-ring is to

be replaced, always put refrigerant oil on o-rings be-

fore installing.

5. Plunger assembly

6. Valve body assembly

7. Direction of flow

CAUTION

Do not damage or over tighten the enclosing tube assembly. Place all parts in the enclosing tube in proper sequence in order to avoid premature coil burn-out.

e. Tighten enclosing tube. f. Install coil assembly, voltage cover and snap cap.

4-7

62-10848

g. Evacuate, dehydrate and recharge unit. See Sec-

tions 4.6 and 4.7.

h. Start unit and check operation.

e. Braze the equalizer tubes to expansion valve.

f. Evacuate, dehydrate and recharge unit. (See Sec-

tions 4.6 and 4.7).

123

1. Cap

3. Set Screw

2. Jam Nut

Figure 4-8 Compressor Pressure Regulating Valve

4.14 ADJUSTING THE COMPRESSOR PRESSURE REGULATING VALVE (CPR) (115V ONL Y)

When adjusting the compressor pressure regulating valve (CPR) (see Figure 4-8), the unit must be running in heating or defrost mode. This will ensure a suction pressure above the proper CPR setting. To adjust the CPR valve, proceed as follows :

a. Install a gauge on the suction line . b. Remove cap from CPR valve. c. With an 8 mm Allen wrench, loosen the jam nut. d. Using the 8 mm Allen wrench, adjust the set screw. To

raise the suction pressure turn the set screw clockwise; to lower the suction pressure, turn counterclockwise. Refer to paragraph 1.6.2 for CPR valve setting.

e. When the setting has been adjusted, tighten the jam

nut securely against the set screw. This will prevent any movement of the set screw due to vibrations in the unit. Replace the cap.

4.15 THERMOSTATIC EXPANSION VALVE

The thermal expansion valve is an automatic device which maintains constant superheat of the refrigerant gas leaving the evaporator regardless of suction pressure. The valve functions are: (a) automatic response of refrigerant flow to match the evaporator load and (b) prevention of liquid refrigerant entering the compressor. Unless the valve is defective, it seldom requires any maintenance.

NOTE

Due to the time involved in adjusting the superheat, replace the valve rather than adjusting it.

g. Check superheat (See Section 1.6.2.g.).

4.15.2 Measuring Superheat

a. Remove insulation from expansion valve bulb and

suction line. See Figure 4-9

b. Loosen one TXV bulb clamp and make sure area un-

der clamp (above TXV bulb) is clean.

c. Place thermocouple above (parallel to) the TXV bulb

and then secure loosened clamp making sure both bulbs are firmly secured to suction line as shown in Figure 4-9

d. Connect an accurate gauge to the ¼” port on the suc-

tion service valve.

e. Run unit until stabilized at --4_F (-20_C) box tempera-

ture.

f. From the temperature/pressure chart (Table 4-4), de-

termine the saturation temperature corresponding to the evaporator outlet pressure.

g. Note the temperature of the suction gas at the expan-

sion valve bulb.

h. Subtract the saturation temperature determined in

Step f. from the average temperature measured in Step g.. The difference is the superheat of the suction gas. Refer to paragraph 1.6.2 for superheat setting.

i. If required, adjust superheat by turning the adjusting

screw located under the cap on the side of the valve.

4.15.1 Replacing expansion valve

a. Remove refrigerant charge (See section 4.4). b. Remove insulation from expansion valve bulb and

then remove bulb from suction line.

c. Loosen flare nut and disconnect equalizer line from

expansion valve.

d. The txv bulb is located below the center of the suction

line. This area must be clean to ensure positive bulb contact. Strap bulb to suction line and insulate both.

62-10848

1. Suction Line (end view)

2. TXV Bulb Clamp

3. TXV Bulb

4. Thermocouple

5. Nut and Bolt (Clamp)

Figure 4-9 Thermostatic Expansion Valve Bulb

And Thermocouple

4-8

4.16 DIAGNOSTIC TOOL

NOTE

The Cab Command diagnostic tool comes with two jumpers. These are not applicable to the 30S system and should not be used in this application.

PRIMARY TOOL

Figure 4-10 Cab Command Diagnostic Tool

(CTD P/N 07--00440-- 00)

a. Testing a cab command cable that is already

installed on the unit and routed into the truck cab requires the use of both pieces of the diagnostic tool.

b. Unplug the cab command cable from the micropro-

cessor and also from the back of the cab command module.

c. Plug one end of the cable into the primary tool and

the other end into the remote tool.

d. Begin the test by turning on the power switch and ob-

serving the sequence of green lights. As each circuit is tested, the corresponding light is illuminated. If a fault is found in the cable, the light that corresponds to that particular circuit is not illuminated.

e. To test a cable that is not installed on a unit, simply

plug each end of the cable into the primary tool and perform the test as above.

4.17 MICROPROCESSOR

REMOTE TOOL

When welding is required on the unit frame, or on the front area of the truck, ALL wiring to the microprocessor MUST be disconnected. When welding is performed on other areas of the truck and van, the welder ground connection MUST be in close proximity to the area being welded. It is also a good practice to remove both battery cables before welding on either the unit frame or the truck to prevent possible damage to other components such as the alternator and voltage regulator.

4.18 EVAPORAT OR COIL CLEANING

The use of recycled cardboard cartons is increasing. The recycled cardboard cartons create much more fiber dust during transport than ”new” cartons. The fiber dust and particles are drawn into the evaporator where they lodge between the evaporator fins. If the coil is not cleaned on a regular basis, sometimes as often as after each trip, the accumulation can be great enough to restrict air flow, cause coil icing, repetitive defrosts and loss of unit capacity. Due to the ”washing” action of normal defrost the fiber dust and particles may not be visible on the face of the coil but may accumulate deep within.

It is recommended to clean an the evaporator coil on a regular basis, not only to remove cardboard dust, but to remove any grease oil film which sometimes coats the fins and prevents water from draining into the drain pan.

Cardboard fiber particles after being wetted and dried several times can be very hard to remove. Therefore, several washings may be necessary.

a. Spray coil with a mild detergent solution such as any

good commercial-grade automatic dish washer detergent and let the solution stand for a few minutes. Reverse flush (opposite normal air flow) with clean water at mild pressure. A garden hose with spray nozzle is usually sufficient. Make sure drain lines are clean.

b. Run unit until defrost mode be initiated to check for

proper draining from drain pan.

WARNING

Although there is less danger of electrical static discharge (ESD) damage in the outdoor environment, where the processor is likely to be handled, proper board handling techniques should be stressed. Boards should always be handled by their edges, in much the same way one would handle a photograph. This not only precludes the possibility of ESD damage, but also lowers the possibility of physical damage to the electronic components. Although the microprocessor boards are fairly rugged when assembled, they are more fragile when separated and should always be handled carefully.

4.19 CONDENSER COIL CLEANING

Remove all foreign material from the condenser coil by reversing the normal air flow. (Air is pulled in through the front.) Compressed air or water may be used as a cleaning agent. It may be necessary to use warm water mixed with any good commercial dishwasher detergent. Rinse coil with fresh water if a detergent is used.

4-9

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Table 4-4. R-134a Temperature-Pressure Chart

BOLD FIGURES = Inches Mercury Vacuum (cm Hg VAC)

LIGHT FIGURES = psig (kg/cm2and Bar)

TEMPERATURE PRESSURE TEMPERATURE PRESSURE

_F _C Psig Kg/cm

Bar _F _C Psig Kg/cm

-- 4 0 -- 4 0 14.6 37.08 -- . 4 9 30 -- 1 26.1 1.84 1.80

-- 3 5 -- 3 7 12.3 31.25 -- . 4 2 32 0 27.8 1.95 1.92

-- 3 0 -- 3 4 9.7 24.64 -- . 3 3 34 1 29.6 2.08 2.04

-- 2 5 -- 3 2 6.7 17.00 -- . 2 3 36 2 31.3 2.20 2.16

-- 2 0 -- 2 9 3.5 8.89 -- . 1 2 38 3 33.2 2.33 2.29

-- 1 8 -- 2 8 2.1 5.33 -- . 0 7 40 4 35.1 2.47 2.42

-- 1 6 -- 2 7 0.6 1.52 -- . 0 2 45 7 40.1 2.82 2.76

-- 1 4 -- 2 6 0.4 .03 .03 50 10 45.5 3.30 3.14

-- 1 2 -- 2 4 1.2 .08 .08 55 13 51.2 3.60 3.53

-- 1 0 -- 2 3 2.0 .14 .14 60 16 57.4 4.04 3.96

-- 8 -- 2 2 2.9 .20 .20 65 18 64.1 4.51 4.42

-- 6 -- 2 1 3.7 .26 .26 70 21 71.1 5.00 4.90

-- 4 -- 2 0 4.6 .32 .32 75 24 78.7 5.53 5.43

-- 2 -- 1 9 5.6 .39 .39 80 27 86.7 6.10 5.98

-- 0 -- 1 8 6.5 .46 .45 85 29 95.3 6.70 6.57 2 -- 1 7 7.6 .53 .52 90 32 104.3 7.33 7.19 4 -- 1 6 8.6 .60 .59 95 35 114.0 8.01 7.86 6 -- 1 4 9.7 .68 .67 100 38 124.2 8.73 8.56 8 -- 1 3 10.8 .76 .74 105 41 135.0 9.49 9.31

10 -- 1 2 12.0 .84 .83 110 43 146.4 10.29 10.09 12 -- 1 1 13.2 .93 .91 11 5 46 158.4 11.14 10.92 14 -- 1 0 14.5 1.02 1.00 120 49 171.2 12.04 11. 8 0 16 -- 9 15.8 1.1 1 1.09 125 52 184.6 12.98 12.73 18 -- 8 17.1 1.20 1.18 130 54 198.7 13.97 13.70 20 -- 7 18.5 1.30 1.28 135 57 213.6 15.02 14.73 22 -- 6 19.9 1.40 1.37 140 60 229.2 16.11 15.80 24 -- 4 21.4 1.50 1.48 145 63 245.6 17.27 16.93 26 -- 3 22.9 1.61 1.58 150 66 262.9 18.48 18.13 28 -- 2 24.5 1.72 1.69 155 68 281.1 19.76 19.37

Bar

62-10848

4-10

SECTION 5

A01High

tch(HP1

)

Open(Road

)

ess

ure

)

LowPressureSwitch(LP)or

g()

Units

Onl

erifylinevoltag

Onl

Verifylinevoltage

Standby

StandbyContactor(MC)hig

Units

highampdraw

A07p(

)

TROUBLESHOOTING

WARNING

Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. Press OFF key on the cab command, turn vehicle engine off or disconnect power plug and open circuit breaker.

CAUTION

Under no circumstances should anyone attempt to service the microprocessor module and cab command. Should a problem develop with the control system, contact your nearest Carrier Transicold dealer for replacement components.

5.1 INTRODUCTION

Under normal circumstances, unit problems will be indicated by an active alarm in the alarm list. Suggested troubleshooting actions for each alarm indication are provided in Table 5-1. Suggested corrective actions for mechanical type problems are listed under subject headings in Table 5-2.

Table 5-1 Alarm Indications

ALARM

A00 No Malfunction All components functioning normally -- --

Description CORRECTIVE ACTION

Unit undercharged 4.7.1

Liquid line filter--drier restricted

Low Pressure Switch (LP) or

ressureSw

Open(Road

TXV strainer plugged with foreign material/ice. TXV malfunction Verify operation of evaporator fans. Failed switch

Unit overcharged 4.7.1

Verify operation of condenser fan

Noncondensibles in system Discharge check valve failed closed (standby only

A02

LowPr High Pressure Switch (HP1) Open

witch(LP

Failed switch

A03

tandby

Units

Electric motor overload

Thermal overload open in motor windings.

Current overload tripped.

Reference Paragraph

4.10.1

4.15

-- --

4.11.2

-- --

4.8

Replace

4.11.2

A04

A05

Units Only

A06

Road Compressor Clutch (CLHR) Malfunction

amp draw

Condenser Fan Motor (CFM)

Evaporator Fan Motor (EFM) high amp draw

Current draw of road clutch coil either high or low Replace

Contactor coil either high or low (0.2A for 3 phase;

0.5A for 1 phase) Verify plunger moves freely Replace contactor Verify motor rotates freely -- --

Verify condition of brushes Replace motor

Verify motor rotates freely -- --

Replace motor

5-1

-- --

4.12

-- --

62-10848

Table 5-1 Alarm Indications -- Continued

Standby

thehotwatercontrolrelayorth

Units

HotGasSolenoidValve

g(ppp

)

A09()

)

A10QuenchValve(BPV)

A11CondenserPressureControl

Units

tur

Units

tur

Standby

Def

Cycle>4

5minutesUnits

Veri

fyHGS1/HGS2val

ion4.1

A15range2

0.2to86

hecksetpoint

2.3

bAt

LowBat

tth

ALARM

A08

Units

Only

A09

A12

Standby

Only

A13

Standby

Only

A14

Standby

Units

Only

EE Return Air Sensor Return air sensor defective Replace

-- -- --

Err Setpoint error. Programming error. Reset. 2.3

Heating option control -- Either

the hot water control relay or the electric heat contactor coil amp draw is high

Hot Gas Solenoid Valve (HGS1) high amp draw

Quench Valve(BPV high amp draw

Condenser Pressure Control Valve (HGS2) high amp draw

Out of Range -- High Tempera-

Out of Range -- Low Tempera-

Setpoint adjusted out of the ran (--29°C/+30°C) or below the programmed low threshold

Using Road & Standby opera-

on a

Description CORRECTIVE ACTION

Verify coil resistance

Check wiring to controls Current draw of coil high or low (approx 1.6 amp) -- --

Replace coil 4.13.1 Current draw of coil high or low (approx 1.2 amp) -- -Replace coil 4.13.1 Current draw of coil high or low (approx 1.6 amp) -- -Replace coil 4.13.1 Unit out of range for 15 minutes Verify Setting

Verify cooling operation of unit -- -Hot gas solenoid open 4.13.1 Unit out of range for more than 15 minutes Verify Setting Verify heating operation of unit -- -Heating option not active (Set configuration) 2.9 Unit terminated defrost after 45 minutes -- --

ros

ve opera

e--20.2to86°F

eryVo

esame

age

me.

Vehicle battery voltage low Correct Check alternator system -- -If operating on road, disconnect standby power sup-

ply If operating on standby, shut down vehicle engine.

Reference

Paragraph

-- --

Table 5-2 Mechanical Indications

INDICATION/TROUBLE

5.2 REFRIGERATION

5.2.1 Unit Will Not Cool

Compressor malfunction

Refrigeration system

5.2.2 Unit Runs But Has Insufficient Cooling

Compressor Compressor defective 4.9

Refrigeration system

62-10848

Compressor drive (clutch) defective Compressor defective

Defrost cycle has not terminated Abnormal pressure Hot gas solenoid malfunction (HGS1)

Abnormal pressure Expansion valve malfunction Non--existent or restricted evaporator airflow

POSSIBLE CAUSES

5-2

REFERENCE

SECTION

Replace

4.9

5.2.5

5.2.6

4.13

5.2.6

5.2.10

5.2.9

Table 5-2 Mechanical Indications -- Continued

INDICATION/TROUBLE

POSSIBLE CAUSES

REFERENCE

SECTION

5.2.3 Unit Operates Long or Continuously in Cooling

Hot Load

Box

Defective box insulation or air leak

Refrigeration system Abnormal pressure

Temperature controller malfunction

Insufficient pull

down time

Correct

5.2.6

5.2.8

Compressor Defective 4.9

5.2.4 Unit Will Not Heat or Heating Insufficient

Abnormal pressure

Refrigeration

Temperature controller malfunction Hot gas solenoid malfunction (HGS1)

Compressor Compressor drive (clutch) defective

Compressor defective

5.2.6

5.2.8

4.13

Check

4.9

5.2.5 Defrost Malfunction

Automatic defrost will not initiate

Manual defrost will not initiate

Defrost cycle initiates but does not defrost

Frequent defrost

Does not terminate or cycles on

Defrost thermostat (DTT) open or defective Hot gas solenoid valve malfunction Defrost disabled through cab command

Microprocessor defective Defrost thermostat (DTT) open or defective

Hot gas solenoid malfunction (HGS1) Condenser Pressure Control valve malfunction (HGS2)

Wet load Defrost settings set to low.

Defrost thermostats (DTT) shorted closed Replace

Replace

4.13

2.5

Replace Replace

4.13

-- --

2.5

defrost

5.2.6 Abnormal Pressure

5.2.6.1 Cooling

High discharge pressure

Low discharge pressure

High suction pressure

Low suction pressure

Suction and discharge pressures tend to equalize when unit is

Condenser coil dirty Noncondensibles in system Refrigerant overcharge Condenser fan/motor defective

Compressor defective Hot gas solenoid malfunction Low refrigerant charge

Compressor defective Hot gas solenoid malfunction Compressor pressure regulator misadjusted (CPR)

Filter–drier partially plugged Low refrigerant charge Expansion valve malfunction No evaporator air flow or restricted air flow Excessive frost on coil

Compressor defective Hot gas solenoid malfunction

4.19

4.8

4.7.1

4.12

4.9

4.13

4.7.1

4.9

4.13

4.14

4.10

4.7.1

5.2.10

5.2.9

Check

4.9

4.13

operating

5.2.6.2 Heating

High discharge pressure

Low discharge pressure

Low suction pressure

Overcharged system Condenser fan or HP2 pressure switch defective Noncondensibles in system Condenser motor/fan defective

Compressor defective Hot gas solenoid valve malfunction

Low refrigerant charge Compressor pressure regulating valve misadjusted (CPR) Condenser Pressure Regulating valve fault (HGS2)

4.7.1

4.11

4.8

4.12

4.9

4.13

4.7.1

4.14

4.13

5-3

62-10848

Table 5-2 Mechanical Indications -- Continued

INDICATION/TROUBLE

POSSIBLE CAUSES

5.2.7 Abnormal Noise

Loose mounting bolts Worn bearings

Compressor

Worn or broken valves Liquid slugging Insufficient oil

Loose shroud

Condenser or evaporator fan

Bearings defective Fanlooseonshaft Bent shaft

5.2.8 Cab Command Malfunction

Fuse open

Cab Command non–operational

Microprocessor malfunction Microprocessor/Cab command cable

5.2.9 No Evaporator Air Flow or Restricted Air Flow

Evaporator coil blocked

Heavy frost on coil Coil dirty

Evaporator fan loose or defective

No or partial evaporator air flow

Evaporator fan rotating backwards Evaporator air flow blocked in box Fan motor(s) malfunction

5.2.10 Expansion Valve

Low refrigerant charge

Low suction pressure with high superheat

External equalizer line plugged Broken capillary Superheat setting too high

REFERENCE

SECTION

Tighten

4.9

5.2.10 Check

Check Check Check

Replace Replace

Check

4.18

Check Check Check

Replace

4.7.1 Repair Repair

4.15.2

Low superheat and liquids lugging in compressor

Superheat setting too low External equalizer line plugged Pin and seat of expansion valve eroded or held open by

4.15.2 Repair

4.15

foreign material

Fluctuating suction pressure

Improper bulb location or installation Insulation missing from sensing bulb Low superheat setting

4.15

Replace

4.15.2

High superheat Expansion valve setting 4.15.2

5.2.11 Malfunction Hot Gas Solenoid or Condenser Pressure Regulating Valve

Valve does not function properly

No power to valve Improper wiring or loose connections Valve improperly assembled Coil or coil sleeve improperly assembled Movement of plunger restricted due to:

Check Check

4.13

a. Corroded or worn parts b. Foreign material lodged in valve c. Bent or dented enclosing tube

Valve shifts but refrigerant continues to flow

Foreign material lodged under seat Defective seat

4.13

5.2.12 Standby Compressor Malfunction

Standby compressor fails to start

Motor contactor defective Motor Overload open Improper power supply 5–minute timer active

Replace

Check

Correct

Check

Standby motor starts, then stops Motor Overload open Check

62-10848

5-4

SECTION 6

ELECTRICAL SCHEMATIC WIRING DIAGRAM

6.1 INTRODUCTION

This section contains Electrical Schematic Wiring Diagram covering the Models listed in Table 1-1. The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein.

WARNING

Under no circumstances should ether or any other starting aids be used to start engine.

WARNING

CAUTION

Observe proper polarity when installing battery, negative battery terminal must be grounded.

CAUTION

6-1 62--10848

ROAD ONLY

LOCATION SYMBOL DESCRIPTION LOCATION IN UNIT

B--9 LP LOW PRESSURE SWITCH EVAPORATOR

B--8 BPT QUENCH THERMOSTAT ROAD COMPRESSOR

P--9 BPV QUENCH VALVE EVAPORATOR

A--5 CC CAB COMMAND CAB

P--7 CFM CONDENSER FAN MOTOR CONDENSER

P--4 CLHR ROAD CLUTCH ENGINE COMPARTMENT

P--6 EFM EVAPORATOR FAN MOTOR EVAPORATOR

D--3 FUSE 25A FUSE LOGIC BOARD

B--10 FI IGNITION FUSE ENGINE COMPARTMENT

B--9 HP1 HIGH PRESSURE SWITCH CONDENSER

B--7 HP2 CONDENSER PRESSURE SWITCH CONDENSER

P--8 HGS1 HOT GAS SOLENOID VALVE CONDENSER

P--9 HGS2 CONDENSER PRESSURE CONTROL VALVE CONDENSER

Figure 6-1 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61350 Rev D

B--7 RAS RETURN AIR SENSOR EVAPORATOR

62--10848

6-2

ROAD ONLY

6-3

Figure 6-2 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61350 Rev D

62--10848

CONDENSER

-9C

TCL

TCH

TIMED

ELAYREL

STAND

BYPANEL

TCL

TCH

TIMED

ELAYREL

STAND

BYPANEL

SWITCH

D--13 PMC GROUND PANEL CONTROL BOX

N--7 PTO MOTOR INTERNAL THERMOSTAT STANDBY MOTOR

115V/1/60Hz

N--8 CS START CAPACITOR STANDBY PANEL D--2 PC MICROPROCESSOR CONTROL BOX

-I--2 CFM CONDENSER FAN MOTOR CONDENSER N--2 PSR POWER SUPPLY RECEPTACLE EXTERNAL

I--5 HGS2 CONDENSER PRESSURE CONTROL VALVE CONDENSER M--12 R DISCHARGE RESISTOR STANDBY PANEL

I--7 CLHR ROAD CLUTCH ENGINE COMP. B--5 RAS RETURN AIR SENSOR EVAPORATOR

J--12 CLHS STANDBY CLUTCH CONDENSER D--10 RR ROAD RELAY MICROPROCESSOR

N--12 C1 FILTER CAPACITOR STANDBY PANEL N--7 DMB STANDBY MOTOR CONDENSER

62--10848

I--3 EFM EVAPORATOR FAN MOTOR EVAPORATOR P--9 STBR START RELAY STANDBY PANEL

B--2 DTT DEFROST TERMINATION THERMOSTAT EVAPORATOR F--10 SR STANDBY RELAY MICROPROCESSOR

I--8 FI IGNITION FUSE ENGINE COMP. Q11 TR TRANSFORMER CONDENSER

LOCATION SYMBOL DESCRIPTION LOCATION IN UNIT LOCATION SYMBOL DESCRIPTION LOCATION IN UNIT

I--9 ALARM (I MAX: 0.1A) EXTERNAL D-- 11 F1 IA FUSE STANDBY PANEL

B--5 LP LOW PRESSURE SWITCH CONDENSER M--10 F2 30A FUSE STANDBY PANEL

B--3 BPT QUENCH THERMOSTAT ROAD COMPR. K--11 F3 5A FUSE STANDBY PANEL

I--5 BPV QUENCH VALVE EVAPORATOR S--10 F4 TRANSFORMER FUSE STANDBY PANEL

D--12 BTY BATTERY ENGINE COMP. B--4 HP1 HIGH PRESSURE SWITCH CONDENSER

A--8 CC CAB COMMAND CAB I--5 HGS1 HOT GAS SOLENOID VALVE CONDENSER

O--12 BR BRIDGE STANDBY PANEL B--4 HP2 CONDENSER PRESSURE CONTROL

N--8 CP PERMANENT CAPACITOR STANDBY PANEL N--4 MC MOTOR CONTACTOR STANDBY PANEL

L--9/M--11 CR CLUTCH RELAY STANDBY PANEL O-- 5 OL OVERLOAD RELAY CONTROL BOX

6-4

115V/1/60Hz

6-5

Figure 6-3 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61353 Rev B

62--10848

230/1/60Hz

-2CFMCOND

ENS

RFA

NMO

TOR

CONDENSER

CFMCOND

ENS

RFA

NMO

TOR

CONDENSER

SWITCH

N--2 PSR POWER SUPPLY RECEPTACLE EXTERNAL

N--7 PTO MOTOR INTERNAL THERMOSTAT STANDBY MOTOR

Figure 6-4 Electrical Schematic Wiring Diagram - Based On Dwg. No. 62-61354 Rev A