Carrier T 298 Users Manual

T--298 to the manual ade90665-5195-4046-a0b1-f9a4d5925d23

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Transport Air Conditioning
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2P
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1

BRN
WHT

BLU

2

GRN/YEL
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WHT

C

EVAP.

RED RED

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SERVICE MANUAL
for
MODEL AirV
Rooftop Air Conditioning Systems

T--298 Rev D

SERVICE MANUAL
For

AirV
AIR CONDITIONING AND
HEATING EQUIPMENT

MODELS
68RV11302A
68RV14102A
68RV14103A
68RV14112A
68RV15102A
68RV15103A

SAFETY SUMMARY
GENERAL SAFETY NOTICES
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. The general safety notices are presented in the following three
sections labeled: First Aid, Operating Precautions and Maintenance Precautions. A listing of the specific
warnings and cautions appearing elsewhere in the manual follows the general safety notices.
FIRST AID
An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention
immediately.
OPERATING PRECAUTIONS
Always wear safety glasses.
Keep hands clear of the evaporator blower and condenser fan.
No work should be performed on the unit until all circuit breakers and start--stop switches are turned off, and
power supply is disconnected.
Always work in pairs. Never work alone.
In case of severe vibration or unusual noise, stop the unit and investigate.
MAINTENANCE PRECAUTIONS
Beware of unannounced starting of the evaporator blower & condenser fan. Do not remove the ceiling grill
assembly or the upper unit cover assembly before turning the power off, and disconnecting the power supply.
Before disconnecting, discharge capacitors by shorting across the capacitors terminals. (See Paragraph
3.5.8)
When disassembling wiring, use numbered stickers to identify wire leads and terminals. This aids in quick,
accurate reassembly.
Be sure power is turned off before working on motors, controllers, or electrical control switches. Tag any circuit
breakers and power supply to prevent accidental energizing of circuits.
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 must be performed by qualified
service personnel.
In case of electrical fire, open circuit switch and extinguish with CO2 (never use water).
Use dry nitrogen to pressurize the system for leak checking. Be careful not to exceed 150 psig test pressure in
the hermetic compressor.
Coil fins are sharp. Use care when removing the cover form the base pan to avoid personal injury.
Oil vapor in piping stubs can ignite from torch flame and cause serious injury. Exercise extreme care when
brazing, and keep brazing cloth and fire extinguisher handy for emergency use.
Disconnect power to the AirV unit before checking the capacitor.

Safety-- i

T-298

SPECIFIC WARNING AND CAUTION STATEMENTS
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.
SPECIFIC WARNINGS AND CAUTIONS

WARNING
Be sure to observe warnings listed in the safety summary in the front of this manual before
performing maintenance on the AirV system

WARNING
Before working on the unit be sure to first disconnect all electric power to the unit to avoid the
possibility of electrical shock and personal injury. Before disconnecting, discharge capacitors by shorting across the capacitors terminals (Refer to paragraph 3.5.8)

WARNING
Shield coils with cardboard to protect hands against injury from sharp metal edges when removing compressor and other components.

WARNING
Oil vapor in piping stubs can ignite from torch flame and cause serious injury. Exercise extreme care when brazing, and keep brazing cloth and fire extinguisher handy for emergency
use.

WARNING
Disconnect power to the AirV unit before checking the capacitor.

WARNING
Do not touch the metal of the screwdriver when discharging the capacitor. You could receive
a shock.

WARNING
Before installing thermostat, turn off all power to unit. There may be more than one power
disconnect. Electrical shock can cause personal injury or death.

CAUTION
Do not use carbon tetrachloride, solvents, or waxes containing solvents to clean plastic sections.
T--298

Safety-- ii

CAUTION
Coil fins are sharp. Use care when removing the cover form the base pan to avoid personal
injury.

CAUTION
The change from Fahrenheit to Celsius will be permanent. It cannot be changed back to Fahrenheit.

CAUTION
When re--assembling, ensure the battery springs are correctly placed in the battery spring
holders.

CAUTION
Improper wiring or installation may damage thermostat. Wiring must conform to local and
national electrical codes.

Safety-- iii

T-298

TABLE OF CONTENTS
PARAGRAPH NUMBER

Page

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.2

SERIAL NUMBER IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.3

DESIGN CHANGE DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1.4

AirV SYSTEM COMPONENT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.4.1 Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.4.2 Compressor - 115 Volts, 60 Cycles, 1 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.4.3 Compressor - 220 Volts, 50 Cycles, 1 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.4.4 Thermostat Range (All Free Blow Units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.5

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.6

REFRIGERANT CYCLE-STANDARD SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

1.7

REFRIGERANT CYCLE - HEAT PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-10

1.7.1 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-10

1.7.2 Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-11

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.1

NO POWER TO UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.2

DUCTED UNIT WILL NOT OPERATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.3

DUCTED UNIT WILL NOT COOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.4

COMPRESSOR POWER SUPPLY OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2.5

COMPRESSOR RUNS BUT CYCLES, FAN OPERATING ERRATICALLY . . . . . . . . . . . . . . . . . . . .

2-1

2.6

CYCLES ON COMPRESSOR OVERLOAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.7

INSUFFICIENT COOLING, COOLING AIR NOT ADEQUATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.8

CONDENSER AIR NOT ADEQUATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.9

INSUFFICIENT COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.10 COMPRESSOR FLOODING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.11 HEATER CYCLES ON LIMIT SWITCH (HEAT/ COOL VERSION ONLY) . . . . . . . . . . . . . . . . . . . . .

2-2

2.12 AIR SWEEP NOT WORKING (FREE BLOW VERSION ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.13 WATER LEAKAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2

2.14 INADEQUATE HEAT (FREE-BLOW HEAT ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

2.15 INADEQUATE HEAT (HEAT-PUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

Clearing Diagnostic Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

SERVICE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.1

PREVENTATIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2

SERVICE - GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.3

CEILING UNIT - FREE BLOW SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.3.1 Filter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.3.2 Ceiling Grill Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.3.3 Ceiling Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.3.4 Master Control Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.3.5 Air Sweep Switch Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.3.6 Indoor Thermostat Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

3.3.7 Air Sweep Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

3.3.8 Heat Strip Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

i

T--298

TABLE OF CONTENTS - Continued
3.4

CEILING UNIT - DUCTED SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

3.4.1 Filter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

3.4.2 Ceiling Grill Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

3.4.3 Control Box Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

3.4.4 Main PCB Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.4.5 PCB Display Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.4.6 Fuse Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

SERVICE - UPPER UNIT - STANDARD, HC & HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.5.1 Exterior Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.5.2 Compressor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3.5.3 Control Box Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3.5.4 Upper Scroll Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.5.5 Motor Assembly and Condenser Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.5.6 Evaporator Blower Wheel Adjustment or Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

3.5.7 Air Handling System Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

3.5.8 Capacitor Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

3.5.9 Capacitor Testing and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

3.5.10 Positive Temperature Coefficient Thermister (PTC) (Start Thermistor) Troubleshooting . . . . .

3-9

3.5.11 Line Voltage - 10% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

SERVICE - UPPER UNIT - LOW PROFILE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

3.6.1 Exterior Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

3.6.2 Upper Scroll Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

3.6.3 Condenser Fan Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-11

3.6.4 Condenser Motor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-12

3.5

3.6

3.6.5 Evaporator Motor/Blower Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-12

3.6.6 Compressor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13

3.6.7 Capacitor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13

3.6.8 Remote Control (Fahrenheit to Celsius) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13

THERMOSTAT INSTALLATION AND START-UP INSTRUCTIONS (WALL MOUNTED) . . . . . . . .

3-15

3.7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.7.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.7.3 Thermostat Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.7.4 Install Thermostat - 12VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.7

3.8

LCD DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.8.1 Cool Only Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.8.2 Heat/Cool Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

SET THERMOSTAT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.9.1 Enter Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3.10 CHECK THERMOSTAT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3.10.1 Fan Operation (Cool Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3.10.2 Fan Operation (Heat/Cool) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3.9

3.10.3 Cooling Operation (Cool Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3.10.4 Cooling Operation (Heat/Cool) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3.10.5 Heating Operation (Heat/Cool) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

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ii

TABLE OF CONTENTS - Continued
3.11 CHECK THERMOSTAT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11.1 Temperature Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11.2 Timeguard Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11.3 Cycle Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11.4 Minimum On Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11.5 Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16
3-16
3-17
3-17
3-17
3-17
4-1
4-1

LIST OF FIGURES
FIGURE NUMBER
Figure 1-1 Model/Serial Number Plate (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-2 Roof Unit Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-3 Ceiling Unit Component Identification (Free-Blow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-4 Component Identification - Low Profile - Upper Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-5 Component Listing-Ceiling Unit For Ducted Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-6 Ducted System Air Flow Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-7 Serial Number Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-8 Refrigerant Flow Schematic (Standard System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-9 Refrigerant Flow Schematic - Heat Pump - (Cool Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-10 Refrigerant Flow Schematic - Heat Pump - (Heat Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-1 Filter Removal - Free Blow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-2 Ceiling Grill - Free Blow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-3 Ceiling Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-4 Ceiling Panel With Heat Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-5 Control Box Assembly - Free Blow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-6 Indoor Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-7 Air sweep motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-8 Heat Strip Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-9 Filter Removal - Ducted Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-10 Ceiling Grill - Ducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-11 Control Box & PCB Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-12 Control Box Assembly - Ducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-13 Main/Display PCB’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-14 Cover Assembly - Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-15 Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-16 Control Box Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-17 Water Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-18 Upper Scroll Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-19 Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-20 Spring Clamp Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-21 Motor Clip Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-22 Condenser Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-23 Blower Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-24 Condenser With Motor Assembly & Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-25 Set-Up For Discharging a Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii

Page
1-1
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
3-1
3-2
3-2
3-2
3-2
3-3
3-3
3-3
3-4
3-4
3-4
3-5
3-5
3-5
3-6
3-6
3-6
3-7
3-7
3-7
3-7
3-8
3-8
3-8
3-9
T--298

LIST OF FIGURES
Figure 3-26 Cover Assembly - Low Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-27 Upper Scroll Assembly Locking Tabs (b.) & Screw Locations (c.) . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-28 Upper Scroll Assembly Keeper Tab Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-29 Upper Scroll & Control Box Cover Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-30 Condenser Fan Assembly & Retaining Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-31 Condenser Fan Motor & Fan Assembly Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-32 Condenser Fan Motor & Fan Assembly Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-33 Condenser Motor Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-34 Evaporator Motor Locking Tabs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-35 Evaporator Motor/Blower Assembly In Cradle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-36 Evaporator Blower Wheel (Flush With End Of Motor Shaft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-37 Control Box Assembly With Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-38 Remote Control Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-39 Remote Control PCB (FR9 Location) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-40 Wall Thermostat Wiring Diagram - Cool Only Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3-41 Wall Thermostat Wiring Diagram - Heat/Cool Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-1 Upper Unit Schematic - Standard & HC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-2 Upper Unit Schematic - Low Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-3 Ceiling Unit Schematic - Cooling Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-4 Ceiling Unit Schematic - Heat/Cool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-5 Ceiling Unit, Standard - Ducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-6 Heat Pump - Upper Unit - Free Blow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-7 Heat Pump - Ceiling Unit - Free Blow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-8 Heat Pump - Upper Unit - Ducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-9 Heat Pump - Ceiling Unit - Ducted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10
3-10
3-10
3-11
3-11
3-11
3-11
3-12
3-12
3-12
3-13
3-13
3-14
3-14
3-17
3-18
4-1
4-1
4-2
4-2
4-2
4-3
4-3
4-4
4-4

LIST OF TABLES
TABLE NUMBER
Page
Table 1-1 Model Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2
Table 1-2 Additional Support Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
Table 2-1 System Self-diagnostics Function (Ducted Remote) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4

T--298
iv

SECTION 1
DESCRIPTION
1.1 INTRODUCTION
MODEL No.

This manual contains service instructions and electrical
data for the AirV, Carrier Transport Air Conditioning’s
Recreational Vehicle air conditioning unit.

Part No.

68RV14102A
99--00468--01
115

VOLTS

The AirV units are two piece systems, consisting of the
Upper Unit and the Ceiling unit. The Upper Unit contains
the refrigeration system while the Ceiling Unit contains
the controls and vents. The Ceiling Units are available in
a free--blow or ducted configuration.

Carrier

Air Conditioning
C

Division of Carrier Corporation

ph
CAPACITY

USE 20 AMP

The free--blow units (see Figure 1-2) deliver air to the
vehicle by means of front and rear end vents and one
downward vent (air shower). The vents may all be
opened or closed to direct air as desired. The front and
rear vents are fitted with motorized dampers that
oscillates to produce an “air--sweep” effect. These units
may be fitted with optional electric heat.

TIME DELAY FUSE OR
CIRCUIT BREAKER

AMPS
DATE OF Mfg
SERIAL No.

1

V
hz

13,500

60
Btu/h

3,955

W

13.5

A

05/03
1303Y12345

DESIGN PSIG HIGH 350 LO 150
oz

15.9

kg

0.45

COMPRESSOR

RLA

12.5

FAN MOTOR

FLA

2.58

R--22

The ducted units (see Figure 1-5 and Figure 1-6) deliver
air through ducting built in the vehicle ceiling. These
units are fitted with a 12 VDC microprocessor control
system, a display panel (PCB display) and a remote
controller. These units may be wired to provide
thermostatic control of the vehicle furnace.

USE CEILING ASSY/ANY

99--00469--01

Figure 1-1 Model/Serial Number Plate (Typical)

Carrier’s AirV air conditioning models include cooling
only units, heating/cooling units, and heat pump units.
The cooling only units are available with free blow or
ducted air delivery. Cooling units with heat strips are
available for free blow only.

1.3 DESIGN CHANGE DESCRIPTIONS
The following list provides a description of changes in
design and serial number breaks for those changes.
1400Y A diode was added to the Ducted Ceiling
assembly control board to stop DC ripple from the
converters,
2900Y Cover screw coating was changed in order to
eliminate corrosion.
3400Y The plastic shroud was modified to improve
drainage.
5100Y A new compressor and capacitor is introduced,
improving stability and increasing capacity.
1201Y The temperature sensor was moved to the grill
to improve temperature sensing during furnace mode,
2501Y The dual air sweep was added.
4501Y A switch was added to skip compressor
malfunction test.
4601Y Change in material was made in order to
strengthen the fan propeller.
4901Y The mounting bolt lengths were increased 3/4
inch.
4901Y The polar white ducted ceiling color was cut--in.
0703Y & 1903Y New style PCB -- Cool Mode -- Control
& Power Assembly (Fans shut off in auto mode).
0803Y & 2603Y New style PCB -- Heat Pump -- Control
& Power Assembly (Fans shut off in auto mode).
4204Y Minimum furnace setpoint lowered from 63°F to
45°F.

Operation of the AirV units is controlled automatically by
the temperature controller (thermostat), which
maintains the vehicle’s interior temperature at the
desired set point. Free Blow, cool--only units are
available with a wall mounted thermostat.
Table 1-1 lists model numbers and descriptions of the
AirV units, and Table 1-2 lists additional support
manuals that are available.
1.2 SERIAL NUMBER IDENTIFICATION
Separate part numbers and serial numbers are provided
for the upper and lower unit assemblies The numbers
may be found on a plate readable from inside the
vehicle, See Figure 1-7.
The first two numbers of the serial number, see
Figure 3-22, is the week the unit was manufactured. For
example, 01 would designate the first week of the year
and 52 would designate the last week of the year.
The third and fourth numbers designate the year in
which the unit was manufactured. For example, 99
would represent the year 1999, 00 the year 2000, and
so on.
The letter Y and all the numbers after it designates the
unit serial number. Example: Y43210
A serial number of 1303Y12345 designates that the unit
was manufactured the 13th week of 2003 and the serial
number is Y12345.

1-1

T--298

Model Number
115V Standard System
68RV14102A
220V Standard System
68RV11302A
High Capacity
68RV15102A

Heat Pump
Systems
68RV14112A

LOW PROFILE
68RV15103A
LOW PROFILE
68RV14103A
Model Number

Table 1-1. Model Chart
UPPER UNIT (ROOF)
Part Number
Voltage
99--00468--00
115/1/60
99--00468--01
115/1/60
99--00468--02
220/1/50
99--00468--03
220/1/50
99--00468--08
115/1/60
99--00468--09
115/1/60
99--00468--04
115/1/60
(Free Blow)
99--00468--05
115/1/60
(Free Blow)
99--00468--06
115/1/60
(Ducted)
99--00468--07
115/1/60
(Ducted)
99--00468--10
(Free Blow -- High Capacity)
99--00468--12
(Free Blow -- Standard)
CEILING UNIT
Voltage
115/1/60
115/1/60
115/1/60
115/1/60
115/1/60 (12VDC)
220/1/50
220/1/50
220/1/50
220/1/50
115/1/60
115/1/60
115/1/60 (12VDC)
115/1/60
115/1/60
115/1/60
115/1/60

115/1/60
115/1/60

Amps
12.8
12.8
5.3 Cool
6.7 Heat
14.5
14.5
12.7 Cool
10.9 Heat
12.7 Cool
10.9 Heat
12.7 Cool
10.9 Heat
12.7 Cool
10.9 Heat
15.1 Cool
13.8 Heat
15.0 Cool
13.7 Heat

Ivory
White
Ivory
White
White

68RV0011LA
68RV0010AB
68RV0010AB
68RV0010BB
68RV0010BB
68RV0040MA

99--00469--22

115/1/60

White

Cool Only

Interface
Free Blow
Free Blow
Free Blow
Free Blow
Ducted
Free Blow
Free Blow
Free Blow
Ducted
Free Blow
Free Blow
Ducted
Free Blow
Free Blow
Free Blow
Free Blow
Ducted
Wall Thermostat

68RV0010DB

99--00469--29

115/1/60

White

Cool Only

Free Blow
Wall Thermostat

68RV0010BA
68RV0010KA
68RV0030AA
68RV0030BA
68RV0030KA
68RV0012CA

T--298

1-2

Options
Cool Only
Cool Only
Heat/Cool
Heat/Cool
Cool Only
Cool Only
Cool Only
Heat/Cool
Cool Only
Heat Pump
Heat Pump
Heat Pump
Cool Only
Cool Only
Heat/Cool
Heat/Cool

White

Part Number
99--00469--00
99--00469--01
99--00469--02
99--00469--03
99--00469--06
99--00469--04
99--00469--05
99--00469--08
99--00469--10
99--00469--11
99--00469--12
99--00469--13
99--00469--23
99--00469--24
99--00469--25
99--00469--26

68RV0010AA

Color
White
Ivory
White
Ivory
White
White
Ivory
White
White
White
Ivory
White
White
Ivory
White
Ivory

Color
White
Ivory
White
Ivory
White
Ivory

MANUAL--FORM NO.

Table 1-2 Additional Support Manuals
EQUIPMENT COVERED
TYPE OF MANUAL

(For) PART NO.
99--00469--00
99--00469--01

71LC6A54310

AirV 115 Volts--Free Blow (Cool Only)

Owner’s Guide

71LH6A54070

AirV 115 Volts--Free Blow (Heat--Cool)

Owner’s Guide

99--00469--02
99--00469--03

71LD6A54070

AirV 115 Volts--Ducted (Cool Only)

Owner’s Guide

99--00469--06

71LH6A54070

AirV 220 Volts--Free Blow (Heat--Cool)

Owner’s Guide

99--00469--08
99--00469--09

71RQ6A5401A

AirV 115 Volts--Free Blow (Heat Pump)

Owner’s Guide

99--00469--11
99--00469--12

71DQ6A5401A

AirV 115 Volts--Ducted (Heat Pump)

Owner’s Guide

99--00469--13

71DW6A54070

AirV 115 Volts--Ducted Wired Thermostat

Owner’s Guide

99--00469--22

71LC6A54310

AirV 115 Volts--Free Blow (Cool Only)

Owner’s Guide

99--00469--23
99--00469--24

71LH6A54070

AirV 115 Volts--Free Blow (Heat--Cool)

Owner’s Guide

99--00469--25
99--00469--26

71RW6A54310
T--298PL
62--50455--00

AirV 115 Volts--Free Blow Wired Thermostat
AirV
Basic refrigeration

Owner’s Guide
Service Parts
Service Training

99--00469--29
ALL
ALL

1

2

3
4

5

1.
2.
3.

Cover
Condenser
Evaporator

4.
5.

Compressor
Base Pan

Figure 1-2 Roof Unit Component Identification
1-3

T--298

1

2

3

4

1.
2.

Ceiling Panel Assembly
Control Box Cover

3.
4.

Control Assembly
Ceiling Grill Assembly

Figure 1-3 Ceiling Unit Component Identification (Free--Blow)

T--298

1-4

1

2
3

4

5

9

6

7

8

10

11

1.
2.
3.
4.
5.
6.

Cover Assembly
Scroll Assembly -- Upper
Condenser Fan
Condenser Motor
Evaporator Motor
Evaporator Blower Wheel

7.
8.
9.
10.
11.

Condenser Coil
Scroll Assembly -- Lower
Evaporator Coil
Compressor
Base Pan Assembly
See Figure 1-3 for Ceiling Package (Free--Blow)

Figure 1-4 Component Identification -- Low Profile -- Upper Unit
1-5

T--298

1

2

3

12
11

10
4
5

6

7

9
8

1.
2.
3.
4.
5.
6.

Telescoping Divider (3 different sizes available)
Divider Assembly
Frame Panel, Insulation Assembly
Control Box Assembly
Control Box Cover
Suction Packing Assembly

7.
8.
9.
10.
11.
12.

Remote Control Assembly
Remote Control Bracket Assembly
Filter Assemblies (2)
PCB Cover
PCB Main Assembly
PCB Display

Figure 1-5 Component Listing--Ceiling Unit For Ducted Systems
T--298

1-6

1
2

3

5

4

SCHEMATIC VIEW

1
SUPPLY AIR

5

2

1

3

SUPPLY AIR
4
RETURN AIR

INSTALLED VIEW
1.
2.
3.

Vehicle Duct System (Connection)
4. Control Box Assembly
Telescoping Divider (3 different sizes available)
5. Supply Air Discharge Area
Return Air Suction Area
Figure 1-6 Ducted System Air Flow Arrangement

1-7

T--298

Serial number
of Upper Unit

Upper Unit
Serial Number
of Ceiling Unit
Ceiling Unit
(Cover Removed)

Free Blow Type
Serial Number of
Ceiling Unit
(Side of Control Box)

Ceiling Assembly Frame

Bottom of
Upper Unit

Ducted Type

Serial Number
of Upper Unit

Bottom View After Installation
(With Grille Removed)

Figure 1-7 Serial Number Locations
T--298

1-8

1.4 AirV SYSTEM COMPONENT SPECIFICATIONS

d. Fully Loaded Amps -- High Capacity
Cooling -- Approx. 14.5 AMPS
Heating -- Approx. 11 AMPS

1.4.1 Refrigerant Charge
Standard -- High Capacity -- Heat Pump
R--22 -- 15.9 Ounces
Low Profile (All)
R--22 -- 16.9 Ounces
1.4.2 Compressor -- 115 Volts, 60 Cycles, 1 Phase
a. Locked Rotor Amps -- Standard -- High
Capacity -- Heat Pump
64.5 AMPS6
b. Locked Rotor Amps -- Low Profile
High Capacity
59.0 AMPS
c. Fully Loaded Amps -- Standard
Cooling -- Approximate 12.8 AMPS
Heating -- N/A

e. Fully Loaded Amps -- Low Profile
Cooling -- Approx. 14.1 AMPS
Heating -- Approx. 13.8 AMPS
f. Fully Loaded Amps -- Heat Pump
Cooling -- Approx. 12.8 AMPS
Heating -- Approx. 11 AMPS
1.4.3 Compressor -- 220 Volts, 50 Cycles, 1 Phase
a. Locked Rotor Amps
23.6 AMPS
1.4.4 Thermostat Range (All Free Blow Units)
61° F (16° C) to 89° F (32° C)
1.5 START--UP
Refer to operating instructions in Owners Guide (see
Table 1-2) packaged with the vehicle system.

CAPILLARY
TUBE

DISCHARGE
LIQUID
EVAPORATOR
SUCTION
ACCUMULATOR

COMPRESSOR

STRAINER

CONDENSER

Figure 1-8 Refrigerant Flow Schematic (Standard System)
1.6 REFRIGERANT CYCLE--STANDARD SYSTEM

The evaporator blower (fan) pulls vehicle air through the
filters, which remove particulate matter, and then pass
the cleaned air through the evaporator coil.

The cooling cycle is energized when the thermostat,
located on the ceiling unit, calls for cooling. The main
components of the system are the compressor,
air-cooled condenser coil, strainer, capillary tube,
evaporator coil and accumulator.
The compressor raises the pressure and the
temperature of the refrigerant and forces it through the
discharge line into the condenser coil. (See Figure 1-8.)
The condenser fan circulates surrounding air (which is
at a temperature lower than the refrigerant) over the
outside of the coil tubes. Heat transfer is established
from the refrigerant (inside the tubes) to the air (flowing
over the tubes). The tubes have fins designed to
improve the transfer of heat from the refrigerant gas to
the air. This removal of heat causes the refrigerant to
liquefy, thus liquid refrigerant leaves the coil and flows
through a strainer to the capillary tube. The strainer
removes any impurities within the refrigerant system.
The capillary tube meters the flow of liquid refrigerant to
the evaporator coil. As the refrigerant flows through the
capillary tube, there is a reduction in pressure and
temperature.

The low pressure, low temperature liquid that flows into
the evaporator coil tubes is colder than the air that is
circulated over the tubes. Heat transfer is established
from the vehicle air (flowing over the tubes) to the
refrigerant (flowing inside the tubes). The evaporator
coil tubes have aluminum fins to increase heat transfer
from the air to the refrigerant; therefore the cooler air is
circulated to the interior of the vehicle.
The transfer of heat from the air to the low temperature
liquid refrigerant in the indoor coil causes the liquid to
vaporize. This low temperature, low pressure vapor
passes into the accumulator. The accumulator is
designed with the inlet tube delivering refrigerant to the
bottom of the tank and the outlet tube taking refrigerant
form the top of the tank. This arrangement ensures that
only vapor refrigerant is returned to the compressor,
where the cycle repeats.
When ventilation only is selected, the indoor fan
functions to circulate air throughout the vehicle. The
refrigerant cycle will remain off.

1-9

T--298

1.7 REFRIGERANT CYCLE -- HEAT PUMP
DISCHARGE
LIQUID

INDOOR COIL

CAPILLARY
TUBE

SUCTION

STRAINER
REVERSING VALVE

ACCUMULATOR

COMPRESSOR
OUTDOOR COIL

Figure 1-9 Refrigerant Flow Schematic -- Heat Pump -- (Cool Mode)
capillary tube, there is a reduction in pressure and
temperature.
The indoor blower (fan) pulls inside air through the
filters, which remove particulate matter, and then pass
the cleaned air through the indoor coil.
The low pressure, low temperature liquid that flows into
the indoor coil tubes is colder than the air that is
circulated over the tubes. Heat transfer is established
from the indoor air (flowing over the tubes) to the
refrigerant (flowing inside the tubes). The indoor coil
tubes have aluminum fins to increase heat transfer from
the air to the refrigerant; therefore the cooler air is
circulated to the interior of the vehicle.
The transfer of heat from the air to the low temperature
liquid refrigerant in the indoor coil causes the liquid to
vaporize. This low temperature, low pressure vapor
passes into the accumulator. The accumulator is
designed with the inlet tube delivering refrigerant to the
bottom of the tank and the outlet tube taking refrigerant
form the top of the tank. This arrangement ensures that
only vapor refrigerant is returned to the compressor,
where the cycle repeats.
When ventilation only is selected, the indoor fan
functions to circulate air throughout the vehicle. The
refrigerant cycle will remain off.

1.7.1 Cooling
The cooling cycle is energized when the thermostat,
located in the ceiling unit, calls for cooling The system
controls are positioned for “normal” refrigerant flow, with
the compressor discharge delivered to the outdoor coil
and liquid delivered to the indoor coil. (See Figure 1-9.)
The main components of the system are the
compressor, reversing valve, air-cooled outdoor coil,
strainer, capillary tube, indoor coil, and the accumulator.
The compressor raises the pressure and the
temperature of the refrigerant and forces it through the
discharge line and reversing valve into the outdoor coil.
The outdoor fan circulates surrounding air (which is at a
temperature lower than the refrigerant) over the outside
of the coil tubes. Heat transfer is established from the
refrigerant (inside the tubes) to the outdoor air (flowing
over the tubes). The tubes have fins designed to
improve the transfer of heat from the refrigerant gas to
the air; this removal of heat causes the refrigerant to
liquefy, thus liquid refrigerant leaves the coil and flows
through the strainer to the capillary tube. The strainer
removes any impurities within the refrigerant system.
The capillary tube meters the flow of liquid refrigerant to
the indoor coil. As the refrigerant flows through the

T--298

1-10

DISCHARGE
INDOOR COIL

CAPILLARY
TUBE

LIQUID
SUCTION

STRAINER
REVERSING VALVE

ACCUMULATOR

COMPRESSOR
OUTDOOR COIL

Figure 1-10 Refrigerant Flow Schematic -- Heat Pump -- (Heat Mode)
outdoor coil. The strainer removes any impurities within
the refrigerant system.
The capillary tube meters the flow of liquid refrigerant to
the outdoor coil. As the refrigerant flows through the
capillary tube, there is a reduction in pressure and
temperature.
The low pressure, low temperature liquid that flows into
the outdoor coil tubes is colder than the outdoor air that
is circulated over the tubes. Heat transfer is established
from the outdoor air (flowing over the tubes) to the
refrigerant (flowing inside the tubes). The outdoor coil
tubes have aluminum fins to increase heat transfer from
the air to the refrigerant.
The transfer of heat from the air to the low temperature
liquid refrigerant in the outdoor coil causes the liquid to
vaporize. This low temperature, low pressure vapor
passes into the accumulator. The accumulator is
designed with the inlet tube delivering refrigerant to the
bottom of the tank and the outlet tube taking refrigerant
form the top of the tank. This arrangement ensures that
only vapor refrigerant is returned to the compressor,
where the cycle repeats.
When ventilation only is selected, the indoor fan
functions to circulate air throughout the vehicle. The
refrigerant cycle will remain off.

1.7.2 Heating
The heating cycle is energized when the thermostat,
located in the ceiling unit, calls for heat The system
controls are positioned for “reverse” refrigerant flow,
with the compressor discharge delivered to the indoor
coil and liquid delivered to the outdoor coil. (See
Figure 1-10.)
The main components of the system are the
compressor, reversing valve, indoor coil, capillary tube,
strainer, air-cooled outdoor coil, and the accumulator.
The compressor raises the pressure and the
temperature of the refrigerant and forces it through the
discharge line and reversing valve into the indoor coil.
The indoor blower (fan) pulls inside air through the
filters, which remove particulate matter, and then pass
the cleaned air through the indoor coil.
The vehicle air (which is at a temperature lower than the
refrigerant) passes over the outside of the coil tubes.
Heat transfer is established from the refrigerant (inside
the tubes) to the vehicle air (flowing over the tubes). The
tubes have fins designed to improve the transfer of heat
from the refrigerant gas to the air; this removal of heat
causes the refrigerant to liquefy, thus liquid refrigerant
leaves the coil and flows through the strainer to the

1-11

T--298

SECTION 2
TROUBLESHOOTING
For ducted units, the green operation indicator LED (SeeFigure 3-9) will flash if there is a problem.
Refer to Table 2--1 for diagnostic information.
PROBABLE REMEDY

SYMPTOM AND PROBABLE CAUSE
2.1 NO POWER TO UNIT
1. Master switch off
2. Open circuit breaker
3. Defective wiring
4. Loose electrical connections
5. Faulty switches, thermostat, or fan
6. 12 VDC not connected (Ducted System)
7. 12 VDC in--line fuse open (Ducted)
2.2 DUCTED UNIT WILL NOT OPERATE
1. Display not illuminated
2. Display illuminated
2.3 DUCTED UNIT WILL NOT COOL
1. Green LED light flashes 5 times

2. Unit cools for a few moments then stops cooling

1. Reset master switch
2. Reset circuit breaker
3. Replace wiring
4. Tighten connections
5. Replace defective components
6. Connect to 12 VDC power source
7. Replace fuse
1. Check 12 Volt DC in--line fuse
2. Check 115 Volt AC Connections
1. Check 115 volt AC power source
Momentarily disconnect 12 VDC power source
Disable compressor malfunction test switch.
Check AMP draw.
Check ∆ T
2. Remove grill, verify evaporator coil probe is
inserted into coil.
Check AMP draw.
Check ∆ T
Replace unit

2.4 COMPRESSOR POWER SUPPLY OPEN
1. Loose leads at compressor terminals
1. Tighten leads
2. Defective motor overload switch
2. Replace switch
3. Defective capacitor
3. Replace capacitor -- Refer to Paragraph 3.5.8
4. Open compressor windings
4. Replace compressor
5. Seized compressor
5. Replace compressor
6. Capacitor incorrectly wired
6. Verify capacitor wiring (Refer to wiring diagram)
2.5 COMPRESSOR RUNS BUT CYCLES, FAN OPERATING ERRATICALLY
1. Loose lead at fan motor
1. Tighten lead.
2. Defective or burned out motor
2. Replace motor.
3. Outdoor air restricted or recirculating
3. Check for dirty condenser coil, proper clearance
around unit, remove any obstructions.
4. Overcharge or noncondensables in system
4. Check AMP draw
5. Restricted discharge line
5. Check for obstruction in line.
Check ∆ T.
Replace unit.
6. Defective motor overload switch
6. Replace switch.

2-1

T--298

SYSTEM AND PROBABLE CAUSE
2.6 CYCLES ON COMPRESSOR OVERLOAD
1. Defective run capacitor
2. Defective compressor bearings or valves
3. Greatly restricted evaporator air, iced evaporator
coil.
4. Low refrigerant charge
5. Evaporator capillary restricted
6. Liquid line restricted
7. Compressor hot

PROBABLE REMEDY
1. Replace capacitor -- Refer to Paragraph 3.5.8
2. Replace unit.
3. Defrost evaporator coil.

4. Replace unit.
5. Replace unit.
6. Replace unit.
7. Verify refrigerant charge.
Check AMP draw.
Check ∆ T.
8. Weak or inconsistent line power
8. Check line voltage at time of compressor start--up.
2.7 INSUFFICIENT COOLING, COOLING AIR NOT ADEQUATE
1. Dirty evaporator coil
1. Clean as required.
2. Iced evaporator coil, slightly low refrigerant charge
2. Defrost or Recharge.
3. Improper fan operation
3. Verify fan rotation (Refer to wiring diagram)
4. Defective fan motor
4. Replace fan motor.
5. Return air filter is dirty
5. Remove and clean filters (Refer to paragraphs 3.3.1
& 3.4.1)
2.8 CONDENSER AIR NOT ADEQUATE
1. Outside Air Restricted
1. Check for obstruction at coil. Remedy as required.
2. Dirty coil
2. Clean coil.
3. Defective fan motor
3. Replace fan motor.
2.9 INSUFFICIENT COOLING
1. Unit undersized
1. Re--evaluate unit for proper capacity.
2. Capillary restricted
2. Check AMP draw.
Check ∆ T.
Replace unit.
2.10 COMPRESSOR FLOODING
1. Unit overcharged

1. Check AMP draw.
Check ∆ T.
Replace unit.
2. Low evaporator airflow
2. Clean filter and/or evaporator coil.
3. Defective electrical connections
3. Check connections per wiring diagram and tighten
any loose connections.
2.11 HEATER CYCLES ON LIMIT SWITCH (HEAT/ COOL VERSION ONLY)
1. Dirty filter
1. Clean or replace filter.
2. Blocked evaporator air inlet (indoor)
2. Remove blockage.
3. Low airflow due to fan motor speed
3. Check fan motor. Repair or replace as necessary.
2.12 AIR SWEEP NOT WORKING (FREE BLOW VERSION ONLY)
1. Ceiling grill not properly aligned
1. Align ceiling grill.
2. Linkage in upper control box stuck
2. Align and lubricate linkage.
3. Air sweep motor failure
3. Replace motor.
2.13 WATER LEAKAGE
1. Water dripping from ceiling unit.
1. Verify vehicle is level
Tighten unit mounting bolts evenly or replace unit
gasket.

T--298

2-2

PROBABLE REMEDY
SYSTEM AND PROBABLE CAUSE
2.14 INADEQUATE HEAT (FREE--BLOW HEAT ONLY)
1. No heat from heat strip.
1. Verify AMP draw . ( 13.8 AMP)
Verify resistance through heating element. (9 OHM)
Check bi--metal switch. If open, replace switch.
2.15 INADEQUATE HEAT (HEAT--PUMP)
NOTE: Allow unit to operate 15 minutes after switching from cooling mode.
1. Reversing valve not operating
1. Check for 115 volts at reversing valve coil

2. Outdoor coil icing.

Check for reversing valve restriction
Verify compressor operation
2. Check outdoor coil sensor

Clearing Diagnostic Alarms
When a repair has been accomplished due to a corresponding alarm, the alarm must be cleared. This is done by
disconnecting the 12 VDC power to the ducted ceiling assembly for one or two seconds. Once the 12 VDC power is
reconnected, the alarm should have been cleared.

2-3

T--298

Table 2--1 System Self--diagnostics Function (Ducted Remote)
Flashes

2

Error Codes

Error Contents

(Priority)

(Malfunction)

1

ROOM AIR THERMISTOR FAILURE

Display Pattern

2

3sec
.

INDOOR COIL
THERMISTOR FAILURE

3

FAN Mode
FURNACE Mode

0.5 sec (3
Times)

3sec.

3sec
.

4

OUTDOOR COIL
THERMISTOR
FAILURE

4

COMPRESSOR
DRIVE
MALFUNCTION

3sec
.

5

FAN Mode
FURNACE Mode

0.5 sec. (5
Times)

3sec
.

6

FAN Mode
FURNACE Mode

0.5 sec. (4
Times)

3sec.

5

FAN Mode

0.5 sec.
(Twice)

3sec
.

3

3sec
.

REVERSING VALVE
DRIVE MAL-FUNCTION

6

3sec
.

DISCHARGE AIR
THERMISTOR FAILURE

0.5 sec.
(Once)

3sec
.

Continuous

7

FAN Mode
FURNACE Mode

0.5 sec.
(6Times)

3sec
.

1

Allowed Modes

THERMISTOR
WIRING WRONG
(only in cooling
test mode)

FAN Mode
FURNACE Mode

3sec
.

0.5 sec. (Continuous)

FAN Mode

3sec
.

NOTE:
If more than two errors occur, the highest ranked code is displayed. If the highest ranked error is cleared, the
next highest ranked error code is displayed.
T--298

2-4

SECTION 3
SERVICE AND MAINTENANCE
3.1 PREVENTATIVE MAINTENANCE

WARNING

Cleaning--Clean evaporator coil and condenser coil.
Hold flashlight behind coil to see if all spaces are clear.
Dust accumulation obstructs or reduces airflow and
results in loss of cooling capacity. Both coils may be
vacuumed when dry. Coils may also be brushed with a
stiff brush and then blown out with compressed air.

Before working on the unit be sure to first
disconnect all electric power to the unit to
avoid the possibility of electrical shock and
personal injury. Before disconnecting, discharge capacitors by shorting across the
capacitors terminals (Refer to paragraph
3.5.8)

Thoroughly clean base pan, motors, fan wheels, and
other components.
Clean cover and ceiling grill. Mild detergents reduce
electrostatic charges on plastic sections of the grill and
are good cleaners.

WARNING

CAUTION

Shield coils with cardboard to protect
hands against injury from sharp metal
edges when removing compressor and other components.

Do not use carbon tetrachloride, solvents,
or waxes containing solvents to clean plastic sections.

3.3 CEILING UNIT -- FREE BLOW SYSTEMS

Painting--Paint any parts that show evidence of rust
with a good rust--prevention paint.

3.3.1 Filter Removal
The filters (Figure 3-1) are located in the ceiling grill. To
remove the filters, do the following:
a. Grasp the edge of the filter at recess in the end of the
ceiling grill.
b. Pull filter completely out of the filter slot.
c. Vacuum filter or wash filter in luke--warm water.
Shake off excess water and dry thoroughly.
d. Replace filter by sliding the filter into the filter slot in
the ceiling grill until the filter frame is flush with the interior grill.

Wiring-- Check all wiring for deterioration and all
electrical contacts for tightness or corrosion.
Mounting--Make sure unit is secure on roof according
to installation instructions provided in Owner’s Guide.
Check fans to insure that they are correctly positioned in
the center of the orifice, and tight on the shaft.
Leaks--Check any connections that show evidence of
oil or leaks. When unit is properly installed (refer to
Owner’s Guide) check gaskets for possible air leakage.
Controls--Check unit to ensure all controls are
functioning correctly and unit operation is normal.
Vibrations can cause unwanted noise.

Filters

NOTE
Check to ensure that piping is not vibrating
against side of the unit.
NOTE
For proper cleaning and flushing, use a UL
approved refrigerant recovery/recycling
system.
NOTE
Refrigerant removal must always include
recovering the refrigerant, not allowing it to
escape to the atmosphere.

Figure 3-1 Filter Removal -- Free Blow
3.3.2 Ceiling Grill Removal
To remove the ceiling grill (Figure 3-2) do the following:
a. Before working on unit place the master switch in the
OFF position and disconnect all electrical power.
b. Remove 4 screws located on the ceiling grill, making
sure to support the weight of the grill.
c. Lower the ceiling grill from the ceiling panel.

3.2 SERVICE -- GENERAL
General Notes—These Service Instructions are
provided to assist the trained and qualified Carrier
service technician in repairing or replacing components
of the AirV units.
3-1

T--298

d. To replace the grill, place the grill up against the ceiling panel and align the screw holes in the grill with the
ceiling panel.

Heat Strip
Connection

e. Replace 4 screws.

Heater Assembly
Option
Mounting
Screws
Figure 3-4 Ceiling Panel With Heat Option
3.3.4 Master Control Switch
To remove the master control switch, do the following:
a. Remove ceiling grill. (Refer to paragraph 3.3.2.)
b. Remove 5 screws that secure the control assembly
(Item 2, Figure 1-3) to the control box cover.
c. Remove the master control switch knob by grabbing
the outside edge of the knob and pulling it off of the
switch stem.
d. Remove 2 screws securing the master control switch
to the control assembly.
e. Carefully disconnect wires from the master control
switch. Label wires to aid in reassembly.
f. Reverse above procedure for reassembly.

Figure 3-2 Ceiling Grill -- Free Blow
3.3.3 Ceiling Panel Removal
To remove the ceiling panel (Figure 3-3) do the
following:
a. Remove the ceiling grill. (Refer to paragraph 3.3.2.)
b. Remove 5 screws securing the duct plate to the ceiling panel.
c. Remove 4 mounting bolts making sure to support the
weight of the ceiling panel.

Junction Box
With Cover

Air Sweep Switch

d. Disconnect the unit harnesses and main power wires
from the ceiling panel.
e. Lower the ceiling panel from the air conditioning unit.
f. Reverse above procedure for reassembly.
Air Sweep Cam

Thermostat

Serial/Model
Number Tag
Duct Plate &
Mounting Holes

Figure 3-5 Control Box Assembly -- Free Blow
3.3.5 Air Sweep Switch Removal
To remove the air sweep switch, do the following:
a. Remove ceiling grill. (Refer to paragraph 3.3.2.)
b. Remove 5 screws securing the control assembly
(Item 2, Figure 1-3) to the control box cover.

Mounting Bolts
Junction Box

c. Disconnect wires from the air sweep switch.
d. Pinch tabs on either end of the switch and slide out of
lower control box cover.
e. Reverse above procedure for reassembly.

Figure 3-3 Ceiling Panel Assembly

T--298

Master Control
Switch

3-2

3.3.6 Indoor Thermostat Removal
To remove the indoor thermostat (Figure 3-6) do the
following:

Air Sweep Motor

a. Remove ceiling grille. (Refer to paragraph 3.3.2.)
b. Remove 5 screws securing the control assembly
(item 3, Figure 1-3) to the control box cover.
c. Remove the indoor thermostat knob by grabbing the
outside edge of the knob and pulling it off of the thermostat stem.
d.Remove 2 screws that secure the indoor thermostat to
the lower control box cover.
e. Carefully disconnect the 2 wires from the indoor thermostat.
f. Remove the sensing bulb from the plastic clip.
g. Carefully slide the sensing bulb through the rubber
grommet.
h. Remove the thermostat from the control assembly.
i. Reverse above procedure for reassembly.

Figure 3-7 Air sweep motor
3.3.8 Heat Strip Assembly Removal
To remove the heat strip assembly (Figure 3-8) do the
following:
a. Remove ceiling grille. (Refer to paragraph 3.3.2.)
b. Unplug electrical connection at air sweep motor assembly.
c. Remove two screws securing heat strip assembly to
the ceiling panel assembly.
d. Slide heat strip assembly away from air sweep motor
assembly and pull down, easing the the electrical
connection through the access hole.
e. Reverse the procedures for reassembly.

Thermostat

Sensing Bulb
Figure 3-6 Indoor Thermostat
3.3.7 Air Sweep Removal
To remove the air sweep, do the following:
a. Remove ceiling grille. (Refer to paragraph 3.3.2.)
b. Remove cam (See Figure 3-3) from air sweep motor
shaft.
c. Remove 4 screws securing air sweep motor bracket
to the ceiling panel assembly.

Heat Strip

d. Carefully disconnect air sweep motor wire terminations.
e. Remove 2 screws securing air sweep motor
(Figure 3-7) to control box and remove motor.
f. Reverse above procedure for reassembly.

Figure 3-8 Heat Strip Assembly

3-3

T--298

3.4 CEILING UNIT -- DUCTED SYSTEMS

c. Remove two screws securing control box cover to
control box assembly. See Figure 3-11.

3.4.1 Filter Removal

d. Remove control box assembly cover.

The filters (Figure 3-9) are located in the ceiling grill. To
remove the filters, do the following:
a. Grasp the edge of the filter at recess in the end of the
ceiling grill.
b. Pull filter completely out of the filter slot.
c. Vacuum filter or wash filter in luke--warm water.
Shake off excess water and dry thoroughly.
d. Replace filter by sliding the filter into the filter slot in
the ceiling grill until the filter frame is flush with the interior grill.
Mounting Screws

Filters

Figure 3-10 Ceiling Grill -- Ducted
e. Disconnect blue furnace wires.
f. Unplug two connectors from upper unit.
g. Unplug DC power plug #1 (red/yellow/black wires)
See Figure 3-12
h. Unplug relay signal plug #2 (brown/red/orange/
yellow wires). See Figure 3-12

Operation Indicators

i. While supporting control box assembly remove two
screws securing control box assembly to ducted ceiling unit.

Figure 3-9 Filter Removal -- Ducted Unit

j. Pull control box assembly from the ducted ceiling unit.

3.4.2 Ceiling Grill Removal

k. Reverse above procedure to reassemble.

To remove the ceiling grill (Figure 3--10) do the following:
a. Before working on unit place the master switch in the
OFF position and disconnect all electrical power.

Control Box

b. Remove filters (Refer to paragraph 3.4.1).

Control Box
Cover Screws

c. Remove 4 screws located on the ceiling grill, (two are
under the filters) making sure to support the weight of
the grill.

Fuse

d. Lower the ceiling grill from the ceiling panel.
e. To replace the grill, place the grill up against the ceiling panel and align the screw holes in the grill with the
ceiling panel.
f. Replace 4 screws and 2 filters.
3.4.3 Control Box Assembly Removal

PCB Cover

To remove the control box assembly (Figure 3-11 &
Figure 3-12) do the following:

PCB Cover
Screws

a. Remove ceiling grill. Refer to paragraph 3.4.2.
b. Disconnect 115 volt (AC) and 12 volt (DC) power
wires.
T--298

Figure 3-11 Control Box & PCB Cover
3-4

3.4.5 PCB Display Removal

115V AC

To remove the PCB display assembly (Figure 3-13) do
the following.

12V DC

a. Remove ceiling grill. Refer to paragraph 3.4.2.
b. Push large clip away from PCB display assembly.
c. Push center clip towards large clip.

#1

Fuse

d. Pull PCB display assembly from PCB cover.
e. Unplug display wiring from PCB main assembly.

Upper Unit
Connectors

f. Reverse above procedures of reassembly.

Furnace
Wires (blue)

#2

3.4.6 Fuse Removal
To remove the fuse (Figure 3-11) do the following:

Figure 3-12 Control Box Assembly -- Ducted

a. Remove ceiling grill. Refer to paragraph 3.4.2.

3.4.4 Main PCB Board Removal

b. Turn fuse holder in direction of arrow (counter-- clock-wise).

To remove the Main PCB board (Figure 3-13) do the
following:

c. Pull fuse from fuse holder.

a. Remove ceiling grill. Refer to paragraph 3.4.2.

d. Test and/or replace.

b. Remove three screws securing the PCB cover to the
ducted ceiling unit.

e. Reverse above procedures for reassembly.

c. Carefully turn over the PCB cover exposing the PCB
main and the PCB display assemblies.

3.5 SERVICE -- UPPER UNIT -- STANDARD,
HC & HP

d. Gently push holding clip away from PCB main assembly.

3.5.1 Exterior Cover Removal

e. Lift PCB main assembly from PCB cover assembly.

CAUTION

f. Unplug display wiring plug #4. Figure 3-13
g. Unplug thermistor/thermostat
Figure 3-13

wiring

plug

#3.

Coil fins are sharp. Use care when removing
the cover form the base pan to avoid personal injury.

h. Unplug power wiring plug #1. Figure 3-12
i. Unplug signal wiring plug #2. Figure 3-12

To remove the exterior cover, do the following:

j. Reverse above procedures for reassembly.

a. Before working on unit place the master switch in the
OFF position and disconnect all electrical power.
b. Remove 15 screws securing the unit cover to the
base pan assembly. See Figure 3-14.

Holding Clips

c. Carefully lift the exterior cover off of the unit base pan
assembly.

PCB Display

d. Reverse above procedure for reassembly.
PCB Main

#4

#3

Cover Screws

Figure 3-13 Main/Display PCB’s

Figure 3-14 Cover Assembly -- Standard
3-5

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3.5.2 Compressor Replacement
Observe the same procedures for rotary compressors
as for reciprocating compressors.
a. Follow all safety codes. Reminder: use protective
goggles, work gloves, and water soaked quenching
cloth.
b. Remove exterior cover. refer to paragraph 3.5.1. Disconnect all wiring from the compressor.
c. Apply field--supplied, line--tap--valves to the suction
and discharge lines as close to the compressor as
possible.
d. Recover the refrigerant charge from the unit. After recovering, cut the discharge and suction line process
tubes below the tube crimps. If you choose a good
tubing location for cutting the refrigeration lines initially, the location is easily accessible when making
the final joints.

Control Box
Screws
Figure 3-15 Control Box

WARNING
Oil vapor in piping stubs can ignite from
torch flame and cause serious injury. Exercise extreme care when brazing, and keep
brazing cloth and fire extinguisher handy
for emergency use.

Water
Cover

e. Connect a nitrogen supply to the unit at one of the line
--tap--valve connectors (5--psig maximum flow), leaving the other connector open to the atmosphere.
Braze angle valves with stubs to each process tube.
f. Remove compressor from unit (3 bolts).
g. Remove line--tap--valves from suction and discharge
lines. Carefully braze the holes closed from where the
line--tap--valves were removed.
h. Clean system: add or replace liquid line filter drier. For
proper cleaning and flushing use a UL approved refrigerant recycling system.
i. Install new compressor and braze into place with
field--supplied copper slip couplings.
j.Connect wiring: replace wire terminals if necessary.
k. Proceed with evacuation and charging (15.9 OZ. -.45 KG R22). Pinch off lines where angle valves were
added. Cut off angle valves above pinch--off , and
braze tubes.
l. Start up unit.
3.5.3 Control Box Assembly Removal

Figure 3-16 Control Box Removal
c. Slide control box out of the lower scroll assembly.
(See Figure 3-16.)
d. To open control box remove 2 screws securing the
water cover to the control box cover.
e. Gently lift the water cover off of the control box. (See
Figure 3-17.)
f. Reverse above procedure for reassembly.

To remove the control box assembly, do the following:
a. Remove exterior cover assembly. Refer to paragraph
3.5.1.
b. Remove 2 screws securing control box assembly to
the lower scroll assembly. (SeeFigure 3-15.)

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Control Box
Cover
Figure 3-17 Water Cover Removal

3-6

3.5.4 Upper Scroll Assembly Removal

i. Remove condenser fan from motor shaft and lift fan
out through the top of the condenser orifice. (See
Figure 3-22)

a. Remove exterior cover assembly. Refer to paragraph
3.5.1.

j. Remove motor assembly.

b. Remove 4 screws securing upper scroll assembly to
the lower scroll assembly. (See Figure 3-18)

k.Reverse above procedure for reassembly.

c. Gently pry 4 snap clips open and lift the upper scroll
assembly off of the lower scroll assembly.
d. Reverse above procedure for reassembly.
Screws
4 Places

Ground screw
Motor Ground
Lead
Figure 3-19 Motor Assembly

Spring Clamp
Snap Clip
4 Places

Figure 3-18 Upper Scroll Assembly

Figure 3-20 Spring Clamp Removal

3.5.5 Motor Assembly and Condenser Fan
Removal
a. Remove exterior cover assembly. Refer to paragraph
3.5.1.
b. Remove control box assembly. Refer to paragraph
3.5.3.

Motor Clip

c. Remove upper scroll assembly. Refer to paragraph
3.5.4.
d. Remove 4 screws securing the condenser cover to
the condenser orifice. (See Figure 3-24.)
e. Carefully disconnect motor wire terminations from
within the control box.
f. Remove 1 screw securing the motor ground lead to
the motor bracket assembly. (See Figure 3-19)
g. Using flat--nosed pliers, depress the motor spring
clamp and slide it off of the condenser fan (See
Figure 3-20).
h. Lift and slide motor towards evaporator coil to remove
condenser fan from the motor shaft.

Figure 3-21 Motor Clip Removal
3-7

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3.5.7 Air Handling System Removal
a. Remove exterior cover assembly. Refer to paragraph
3.5.1.
b. Remove control box assembly. Refer to paragraph
3.5.3.
c. Remove upper scroll assembly. Refer to paragraph
3.5.4.
d. Remove motor assembly. Refer to paragraph 3.5.5.
e. Remove 8 screws securing lower scroll assembly to
the base pan assembly.
f. Remove 1 screw from clamp securing suction tube to
the base pan assembly.
Condenser Fan

g. Remove 3 nuts securing the compressor to the base
pan assembly.
h. Remove 2 screws securing the condenser orifice to
the base pan assembly.
i. Remove 2 screws securing the condenser coil assembly to the base pan assembly.

Figure 3-22 Condenser Fan Removal
3.5.6 Evaporator Blower Wheel Adjustment or
Removal
a. Remove exterior cover assembly. Refer to Exterior
Cover Assembly Removal instructions 3.5.1
b. Remove control box assembly. Refer to Control Box
Assembly Removal instructions 3.5.3
c. Remove upper scroll assembly. Refer to Upper Scroll
Assembly Removal instructions 3.5.4
d. Loosen motor assembly. Refer to Motor Assembly
Removal instructions 3.5.5.
e. Mark shaft at a point where wheel hub and motor
shaft meet to aid in reassembly.(See Figure 3-23.)
f. Remove 1 set screw holding the blower wheel to the
motor shaft. (See Figure 3-23)
g. Slide off blower wheel from motor shaft
h. Reverse above procedure for reassembly.

j. Carefully lift the entire assembly off of the base pan
assembly.
k. Reverse the above procedure for reassembly, ensuring that the air handling system is positioned correctly. Tighten all screws.

Compressor
Condenser Cover

Set Screw

Condenser
Cover Screws

Motor Assembly

Base Pan
Base Pan
Figure 3-24 Condenser With Motor Assembly &
Compressor

Figure 3-23 Blower Wheel

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3-8

3.5.8 Capacitor Troubleshooting

WARNING

WARNING

Do not touch the metal of the screwdriver
when discharging the capacitor. You could
receive a shock.

Disconnect power to the AirV unit before
checking the capacitor.

b. After the capacitor has been discharged and all wires
removed from the capacitor terminals, use an ohm-meter to test its resistance.
c. Set the scale to R x 1K or 10K ohm and place the
ohmmeter leads across the capacitor terminals.
d. If the ohmmeter first reads 0, then rises toward infinity
or some higher resistance, the capacitor is good.
e. If the ohmmeter goes to 0 or a low resistance and
stays there, the capacitor is shorted and needs to be
replaced.
f. If the ohmmeter reads infinity (OL) the capacitor is
open and needs to be replaced.

To test capacitor to determine if good, open or shorted,
an ohm meter can be used. To determine a capacitor’s
capacitance, a capacitor meter is required.
Capacitors showing signs of leaks or bulging should be
replaced immediately.

3.5.9 Capacitor Testing and Replacement
Capacitors must be discharged properly before testing.
a. Place a 20,000 ohm, 2 watt resistor across the terminals of the capacitor for approximately 30 seconds
(See Figure 3-25 for a suggested tool).

INSULATED SCREWDRIVER
20,000 -- OHM
2 -- WATT RESISTOR

ATTACH TO CLEAN UNPAINTED
METAL PART OF UNIT FRAME
CLIP TO
SCREWDRIVER

TOUCH TO CAPACITOR TERMINALS
TO DISCHARGE CAPACITOR

Figure 3-25 Set--Up For Discharging a Capacitor
3.5.10 Positive Temperature Coefficient Thermister
(PTC) (Start Thermistor) Troubleshooting
a. Disconnect power from the AirV unit.
b. Disconnect the wires to the PTC.
c. Using an ohm meter, check for continuity across the
PTC.
If the PTC does not have continuity, it must be replaced.
If continuity exists, reconnect the wires to the PTC.
d. Reconnect power to the AirV unit.
e. Turn on the AirV unit to start.
f. Use a clamp--on amp probe to monitor the amp draw
of the compressor during its start--up.

When the compressor starts, an amp draw will be
indicated for almost a second.
If no amp draw is indicated or if the amp draw occurs for
much longer than a second, the PTC is defective and
must be replaced.
3.5.11 Line Voltage -- 10%
Line voltage should be checked during peak electrical
load periods.
With the AirV unit on and the compressor operating, use
a voltmeter to check the voltage being supplied to the
AirV unit. The voltage must be within 10% of the units
required voltage. A voltage drop greater than 10% will
cause a premature compressor failure and needs to be
corrected immediately.

3-9

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3.6 SERVICE -- UPPER UNIT -- LOW PROFILE
3.6.1 Exterior Cover Removal
b.

b.

CAUTION
b.

Coil fins are sharp. Use care when removing
the cover form the base pan to avoid personal injury.

b.

To remove the exterior cover, do the following:
a. Before working on unit place the master switch in the
OFF position and disconnect all electrical power.
b. Remove (8) screws securing the unit cover to the
base pan assembly. See Figure 3-26.
c. Carefully lift the exterior cover off of the unit base pan
assembly.
d. Reverse above procedure for reassembly.

c.
b.

b.

Figure 3-27 Upper Scroll Assembly
Locking Tabs (b.) & Screw Locations (c.)

Screws
Screws

Figure 3-26 Cover Assembly -- Low Profile
3.6.2 Upper Scroll Assembly Removal
To remove the upper scroll assembly, do the following:
a. Remove exterior cover assembly. Refer to paragraph
3.6.1.
b. Release the (2) front, (2) rear, (1) left side and (1) right
side locking tabs (See Figure 3-27) by pulling back on
the tabs (See Figure 3-28).
c. Remove the screw (1) from the control box cover
(See Figure 3-27).
d. With all (6) locking tabs released and control box
screw removed, lift the upper scroll assembly off of
the lower scroll assembly.
e. Reverse above procedure for reassembly. Ensure all
(6) locking tabs snap shut & lock.

T--298

Figure 3-28 Upper Scroll Assembly
Keeper Tab Release

3-10

Evaporator Coil

Retaining
Ring

Figure 3-30 Condenser Fan Assembly
& Retaining Ring

Fan Stop
Condenser Coil
13MM
Bolt

Condenser Motor

13MM
Bolt

Grommet
Figure 3-29 Upper Scroll & Control Box
Cover Removed

Figure 3-31 Condenser Fan Motor
& Fan Assembly Stop

3.6.3 Condenser Fan Assembly Removal
To remove condenser fan assembly, do the following:
a. Perform steps outlined in Section 3.6.2.
b. Depress and
Figure 3-30).

remove

Retaining

Ring

(See

Tab

c. Using both hands, carefully pull up on fan assembly
until it is free of the motor shaft.
d. When replacing the fan assembly make sure the fan
assembly is against the stop on the shaft (See
Figure 3-31)
e. Push back on tab to allow fan assembly to rest
against stop (See Figure 3-32). Fan assembly will
now be flush with the end of the motor shaft.
Figure 3-32 Condenser Fan Motor
& Fan Assembly Tab

f. Reverse above procedure for reassembly.
3-11

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3.6.4 Condenser Motor Removal
To remove condenser fan motor, do the following:
a. Perform steps outlined in Section 3.6.2.
b. Remove (3) 13MM bolts (See Figure 3-31).
c. Remove (3) Grommets. Inspect, replace or reuse.
d. Cut Tie--Wraps & discard (2 locations). When reassembling, tie--wrap at same 2 locations.
e. Remove ground wire from compressor bracket (See
Figure 3-33).
f. Un--plug (yellow/brown/white) from control box assembly.
g. Reverse above procedure for reassembly.

Blower Side Locking Tabs

Cond. Motor
Ground Screw

Outside Locking Tabs

Comp. Mounting Bolt

Figure 3-33 Condenser Motor Ground
3.6.5 Evaporator Motor/Blower Assembly
Removal
To remove the evaporator motor, do the following:
a. Perform steps outlined in Section 3.6.2.
b. Pull back on and release the (4) locking tabs. There
are 2 on each side of the control box assembly. (See
Figure 3-34).

Figure 3-34 Evaporator Motor Locking Tabs
Lower Scroll
Assembly

Capacitor

c. Lift control box assembly from lower scroll assembly,
exposing evaporator motor.
d. Un--plug (black/blue/white/brown) evaporator motor
from control box assembly.
e. Remove ground wire (green/yellow) from motor
housing.
f. Lift motor/blower assembly from lower scroll assembly cradle.
g. Carefully remove the blower wheel from the evaporator motor shaft by pushing out from the motor side.

T--298

Cradle
Figure 3-35 Evaporator Motor/Blower Assembly
In Cradle

3-12

NOTE
When reassembling the blower wheel on to
the motor shaft ensure that the blower
wheel is flush with the end of the motor
shaft (SeeFigure 3-36).

NOTE
When placing the evaporator motor/blower
assembly back into the lower scroll assembly cradle, make sure that the assembly is
seated securely in the cradle.
(See Figure 3-35).

h. Reverse above procedure for reassembly.
3.6.6 Compressor Replacement
Perform the procedures outlined in Section 3.5.2
There are 4 bolts with the Low Profile Compressor.
The system charge for the Low Profile unit is 16.9 OZ.
3.6.7 Capacitor Removal
To remove the capacitor, do the following:
a. Perform steps a., b. & c. as outlined in Section 3.6.5.

Wheel Flush With Motor Shaft

b. Perform steps outlined in Sections 3.5.8 & 3.5.9.
c. The Low Profile Capacitor is removed from the control box assembly by pushing on the capacitor from
under the control box assembly (See Figure 3-35).

Figure 3-36 Evaporator Blower Wheel
(Flush With End Of Motor Shaft)

Control Box Assembly

Upper Scroll Assembly

Capacitor

Terminal Block

Figure 3-37 Control Box Assembly With Capacitor
3.6.8 Remote Control (Fahrenheit to Celsius)

CAUTION

All Remote Control Assemblies in the United States are
pre--set to display in Fahrenheit degrees (see
Figure 3-38). To change from a Fahrenheit display to a
Celsius display do the following:

The change from Fahrenheit to Celsius will
be permanent. It cannot be changed back to
Fahrenheit.
3-13

T--298

a. Remove the batteries from the remote control.
b. Carefully remove the remote cover by inserting a narrow flat object between the cover and remote body
and prying apart.
c. Remove the brass screw holding the PCB in place.
d. Carefully remove the PCB board from the remote
body, making sure the battery springs release from
their holders.
e. Locate FR9 on the PCB board (see Figure 3-39).

f. Carefully cut the FR9 jumper wire.
g. Reverse above procedure for reassembly.

CAUTION
When re--assembling, ensure the battery
springs are correctly placed in the battery
spring holders.
Battery Springs

BATTERIES
&
COVER

Spring Holders

PCB

COVER

BODY

Figure 3-38 Remote Control Components

PCB

FR9

Figure 3-39 Remote Control PCB (FR9 Location)

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3-14

2.Disconnect wires from existing thermostat, one at
a time. Be careful not to allow wires to fall back into
the wall.
3.As each wire is disconnected, record wire color
and terminal marking.
4.Discard or recycle old thermostat.

3.7 THERMOSTAT INSTALLATION AND START-UP INSTRUCTIONS (WALL MOUNTED)
3.7.1 Introduction
The thermostat is a wall mounted, low--voltage
thermostat which maintains room temperature by
controlling the operation of a heating and air
conditioning system. Batteries are not required;
temperature and mode settings are preserved with the
power off.

NOTE
Mercury is a hazardous waste and must be desposed of properly.

CAUTION

c. Seperate the front and back pieces of plastic.
d. Route thermostat wires through hole in back piece of
plastic. Level plastic against wall (for aesthetic value
only -- thermostat need not be leveled for proper operation) and mark wall through 2 mounting holes.
e. Drill two 3/16 inch mounting holes in wall where
marked.

Improper wiring or installation may damage
thermostat. Wiring must conform to local
and national electrical codes.

WARNING

NOTE
Mounting holes on thermostat are designed to
fit on a horizontal J--Box.

Before installing thermostat, turn off all
power to unit. There may be more than one
power disconnect. Electrical shock can
cause personal injury or death.

f. Secure back plastic to wall with 2 anchors and screws
provided, making sure all wires extend through hole in
plastic.
g. Connect wires to proper terminal of the connector
block in the front piece of plastic.
h. Pusr any excess wire back into wall. Excess wire inside the thermostat plastic case can interfere with
proper air flow across the temperature sensor. Seal
hole in wall to prevent air leaks. Leaks can effect operation.
i. Snap front and back pieces of plastic together.
j. Turn on power to the unit.

3.7.2 Installation
NOTE
Read all instructions before starting the installation.
NOTE
The thermostat requires no batteries. The thermostat is not a power stealing device and
MUST have both R and C connected.

3.8 LCD DISPLAY
3.8.1 Cool Only Thermostat (Part No. 1110--421)
On power up, the LCD readout will display C (Cool
Only).

3.7.3 Thermostat Location
The thermostat should be mounted:
Approximately 5 foot (1.5m) from the floor.
Close to or in a frequently used room, preferably on
an inside partitioning wall.

3.8.2 Heat/Cool Thermostat (Part No. 1110--420)
On power up, the LCD readout will display HC (Heat/
Cool).

On a section of wall without pipes or duct work.
The thermostat should NOT be mounted:
Close to a window, or an outside wall, or next to a door
leading to the outside.

3.9 SET THERMOSTAT CONFIGURATION
While in configuration mode, three option choices can be
made.

Exposed to direct light and heat from a lamp, sun, fireplace, or other temperature--radiating object which
may cause a false reading.

A - Anticipator Value Adjustment

Close to or in direct airflow from supply registers and
return--air grilles.

d - Display Temperature Fahrenheit/Celcius Selection

In areas with poor air circulation, such as behind a
door or in an alcove.

oF - Offset Adjustment For Room Temperature

3.7.4 Install Thermostat -- 12VDC
3.9.1 Enter Configuration Mode
Enter and hold the FAN button for approximately 10 seconds until room temperature disappears and the display
reads A. You are now in the configuration mode.

a. Turn off all power to unit.
b. If an existing thermostat is being replaced:
1.Remove existing thermostat from wall.
3-15

T--298

NOTE
If the FAN button is pressed again or if no button
is pressed for two minutes, the thermostat will
exit the configuration mode and return to normal operation. To re--enter the configuration
mode, the FAN button must be pressed and
held for 10 seconds again.

c.

d. Use UP & DOWN buttons to select a value between
--5 and 5.
e. Press MODE buttonto return to oF. UP & DOWN
buttons now move between option choices; or press
FAN button to exit configuration mode.
3.10 CHECK THERMOSTAT OPERATION

While in the configuration mode, the following options
are available:
A. ANTICIPATOR -- Value Adjustment
This adjustment controls the sensitivity and cycle rate of
the thermostst. Higher numbers decrease the
sensitivity and slow the cycle rate. Lower numbers
increase the sensitivity and increase the cycle rate.
However, a limiting feature will not allow more than 4
equipment cycles per hour, regardless of setting. Values
can range from 1 to 3. Factory default setting is 2. This
default selection will provide optimum performance in
nearly all installations. Try it first. Do not change settings
unless there is evidence of need to do so. Unlike
conventional anticipators, this setting is not determined
by current draw. There is no need to measure, know, or
compensate for current.
To Adjust:
a. Enter configuration mode (if not already there).

3.10.1 Fan Operation (Cool Only)
1. Press FAN button, starting fan operation. FAN annunciator turns on; Lo is displayed in the room temperature area for 5 seconds indicating Fan Low
Speed.
2. Press FAN button, FAN annunciator remains on; Hi
is displayed in room temperature area for 5 seconds
indicating Fan High Speed.
3. Press FAN button, stopping fan operation. FAN annunciator turns off.
3.10.2 Fan Operation (Heat/Cool)
1. Press FAN button, starting low fan (Lo) operation.
FAN annunciator turns on.
2. Press FAN button, starting high fan (Hi) operation.
FAN annunciator remains on.

b. Use UP & DOWN buttons to display A.
c. Press MODE button once to display current value.
d. Use UP & DOWN buttons to move between values.
e. Press MODE buttonto return to A. UP & DOWN
buttons now move between option choices A, d, oF or
press FAN button to exit configuration mode.
d. Fahrenheit/Celsius Selection
This selection operates the thermostat in either
Fahrenheit or Celsius.
To Select:
a. Enter configuration mode (if not already there).
b. Use UP & DOWN buttons to display d.
c. Press MODE button once to display current
selection of F or C.
d. Use UP & DOWN buttons to change between F & C.
e. Press MODE buttonto return to d. UP & DOWN
buttons now move between option choices; or press
FAN button to exit configuration mode.

3. Press FAN button, stopping fan operation. FAN annunciator turns off.
3.10.3 Cooling Operation (Cool Only)
1. Press and release MODE button until COOL is displayed.
2. Press DOWN button until LCD readout reads 10 degrees below room temperature. Cooling and High
Fan system should begin to operate within 5 minutes.
3.10.4 Cooling Operation (Heat/Cool)
1. Press and release MODE button until COOL is displayed.
2. Press DOWN button until LCD readout reads 10 degrees below room temperature. Cooling and High
Fan system should begin to operate within 5 minutes.
3.10.5 Heating Operation (Heat/Cool)
1. Press and release MODE button until HEAT is displayed.

oF. Room Temperature Offset Adjust Selection
The selected number is the number of degrees, plus or
minus, which will be added to the actual temperature.
The numbers can range between --5 and +5. Factory
default is 0. This adjusted value will be used as actual
temperature for both display and control action. The
effect is that a positive number selection will make the
room temperature lower, and vice versa. The
thermostat is calibrated within an accuracy of plus or
minus 2 degrees when shipped from the factory; this
adjustment will provide the best accuracy when set to o.
To Select:
a. Enter configuration mode (if not already there).
b. Use UP & DOWN buttons to display oF .
T--298

Press MODE button once to display offset value.

2. Press UP button until LCD readout reads 10 degrees
above room temperature. Heating system should
begin to operate within 1 minute.
3.11 CHECK THERMOSTAT OPERATION
3.11.1 Temperature Display
The thermostat will display room temperature until the
UP or DOWN button is pressed. The word SET appears
when these buttons are pressed and the current set
point is displayed. If no buttons are pressed for 5
seconds, the display will change back to show room
temperature.
3-16

3.11.2 Timeguard Timer

minutes regardless of demand). However, pressing UP
and FAN buttons simultaneously or changing the set
point will override the timer for 1 cycle.

A 3--minute timeguard is built into the thermostat
immediately upon power up, and any time the
compressor (output “Y”) turns off. The compressor will
not turn on until the timeguard has expired. Pressing UP
and FAN buttons simultaneously will override the
timeguard for 1 cycle.

3.11.4 Minimum On Timer
Once the equipment has turned on, it will remain on for a
minimum of 2 minutes regardless of demand. However,
the equipment can turn off in less than 2 minutes if a
change in set point, or a changein mode occurs.

3.11.3 Cycle Timer

3.11.5 Error Messages

In normal cooling (and heating) operation the
thermostat will not allow more than 4 equipment cycles
per hour (or 1 cycle every 15 minutes). Both the “Y”
(cooling) and “W” (heating) outputs have a 15--minute
timer that starts counting down when the output is
turned on, (e.g., if “Y” output is turned on for 9 minutes
and then satisfies, it cannout turn back on for another 6

Factory Wiring

UPPER UNIT

Motor

E4 will be displayed if the thermostat has an internal
memory failure. If E4 appears, replace the thermostat.
---- (two dashes) will be displayed if the thermostat
cannot properly read the room temperature. If ---appears, replace the thermostat.

Field Wiring

Comp.

1 2 3 4

2

1 2 3 4

J

1

115V AC High Voltage
Power Supply
L
N2
N1

THERMOSTAT
POWERBOX
ASSEMBLY

1

W

2

Y

3

GH

GH FAN (High)

4

GL

GL FAN (Low)

5

C

Y

COOL (Compressor)

12VDC LowVoltage
Power Supply

R
C

CEILING UNIT

Figure 3-40 Wall Thermostat Wiring Diagram -- Cool Only Model
3-17

T--298

Factory Wiring

Field Wiring

UPPER UNIT

Motor

Comp.

1 2 3 4

21

1 2 3 4

J

115V AC High Voltage
Power Supply
L
N2
N1

THERMOSTAT
POWERBOX
ASSEMBLY

1

W

2

Y

3

GH

GH FAN (High)

4

GL

GL FAN (Low)

5

C

R

TB

C

1
2

Y

COOL (Compressor)

Blue
Blue

+ 12VDC

12 VDC (Gnd)

FURNACE

CEILING UNIT

Figure 3-41 Wall Thermostat Wiring Diagram -- Heat/Cool Model

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3-18

12VDC LowVoltage
Power Supply

SECTION 4
WIRING SCHEMATICS
4.1 INTRODUCTION
This Section contains wiring schematics for the AirV units.
Figure 4--1 is the schematic for the standard upper unit assembly and it is applicable to all standard units.
Figure 4--2 is the schematic for the Low Profile upper unit assembly.
Figure 4--3 is the schematic for a free blow ceiling unit without heat while Figure 4--4 is a free blow unit with heat.
Figure 4--5 is for a ducted unit with microprocessor control.
Figure 4--6 is for an Upper Unit Heat Pump with free blow application and Figure 4--7 is the matching free blow ceiling
unit.
Figure 4--8 is for the Upper Unit Heat Pump ducted application and Figure 4--9 is the matching ducted ceiling unit.
Note that the ducted units have 115 VAC power for the components and 12 VDC power for the microprocessor control
system.
Figure 4--10 is for the ducted or free blow application that uses a wall--mounted thermostat, with or without the furnace
option.
Where applicable, diagrams that designate 115 Volt, 60 H, 1 Phase, are also available using 220 Volts, 50 H, 1 Phase.
Most noteably Figure 4--1 and Figure 4--5.
FAN MOTOR

4P

2P
BLK

1

BLU

2
PLUG CONNECTS
TO CEILING UNIT
SEE FIG> 4--3
OR 4--4

BLK

1

BRN
WHT

BLU

2

GRN/YEL

3
GRN/YEL

4

CONTROL
BOX

2P

F

WHT

GRN/YEL

C

EVAP.

H

RED RED

CAPACITOR

BLU

WHT

1

R

YEL

2

YEL
2

1

PTC

C

BLU

S
OVERLOAD PROTECTOR
(If Used)
COMPRESSOR

Figure 4--1 Upper Unit Schematic -- Standard & HC

PLUG CONNECTS TO CEILING UNIT.
SEE DIAGRAM SUPPLIED WITH
CEILING UNIT FOR ADDITIONAL
WIRING.

(UNIT - 99-- 00468-- 10)
4P

INDOOR FAN MOTOR

4P
BLK

1

1

BLU

2

WHT

WHT

3

BRN

GRN/YEL

4

BLK

1

2

2

3

3

4

4

BLU

GRN/YEL

WHT
BRN

FMC
YEL

2P

WHT

1

YEL

2

OUTDOOR FAN MOTOR

3P
1

1

2

2

3

3

YEL
WHT
BRN
C

BRN

F
H

CAPACITOR

WHT
WHT

LEGEND
OLP: OVERLOAD PROTECTION
PTC: START THERMISTER
JTB: JOINT TERMINAL BLOCK
FMC: INDOOR FAN MOTOR CAPACITOR

YEL

OLP
(IF USED)
YEL C
1
2
(3)

R

S

RED

BLU

RED
PTC
(IF USED)
BLU

COMPRESSOR

Figure 4--2 Upper Unit Schematic -- Low Profile
4-1

T--298

UPPER UNIT FOR ADDITIONAL WIRING.

BLK

BLU

1

2

ASW
1

2
ORN

ORN

6

WHT

1

2

1

BLK
YEL
8

ORN

L

C

PLUG CONNECTS TO UPPER UNIT.

4P

3

2P

2

4

WHT
GRN/YEL

115 VAC
SUPPLY
WIRE

IT

SW

ASM
2P

{

WHT

1
YEL

GRN/YEL

2

SEE DIAGRAM SUPPLIED WITH

4

SWITCH
POSITION

CONTACTS MADE

HIGH FAN

1--4 . 1--6

LOW FAN

1--2 . 1--6
NONE

OFF
LOW COOL

1--2 . 1--6 . 1--8

HIGH COOL

1--4 . 1--6 . 1--8

O (OFF)
ASW

2

I (ON)

2 -- 1

LEGEND
ASM : AIR SWEEP MOTOR
ASW : AIR SWEEP SWITCH
SW : SWITCH
IT : INDOOR THERMOSTAT

Figure 4--3 Ceiling Unit Schematic -- Cooling Only

L
L1

ORN
2

1

BLK
YEL

1

1
B
3

IT

ASW

115 VAC
SUPPLY
WIRE

HT

ORN

HEATER--ASSY

BLK

1

3

LOW COOL

L2--C . L1--L . L1--A . B--3

HIGH COOL

L2--C . L1--H . L1--A . B--3

HEAT

L2--HT . L1--L . L1--A . B--1

WHT
GRN/YEL

ASM

C

2P
WHT

WHT

CEC

GRN/YEL

1

YEL

NONE
L1--L . L1--A

2

4

WHT

CONTACTS MADE

LOW FAN
HIGH FAN

BT

2P

{

2

OFF

HEATER

BLK

2

WHT
L2

1

3

BLU

BLK

2P

2

RED

WHT

ORN

A

1

UPPER UNIT FOR ADDITIONAL

BLU

SWITCH
POSITION

L1--H . L1--A

O (OFF)

ASW

1 (ON)

2

2 -- 1

LEGEND
ASM AIR SWEEP MOTOR
ASW AIR SWEEP SWITCH
SW SWITCH
IT INDOOR THERMOSTAT
CEC CLOSED END CONNECTOR

WIRING.

H

4P

PLUG CONNECTS TO UPPER UNIT.

BLK

SEE DIAGRAM SUPPLIED WITH

SW

BT BIMETAL

2

Figure 4--4 Ceiling Unit Schematic -- Heat/Cool
LEGEND
IDC Th : INDOoR COIL THERMISTER
RA Th : ROOM AIR THERMISTER
KY : RELAY
DI : DIODE

1 2 3 4

3 2

RA Th

IDC Th

CN1
BLK

BRN

1
2
3
4

PCB

1

BLK

CN3

1

WHT

Y

CN4

CN4

CONTROL

2

GRN/YEL
BLU
BLK
WHT

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

1
2
3

1
2
3

1
2
3

RY1

RY3

BLK

L

RY2

N2

WHT

N1

115 VAC POWER

GRN/YEL

ASS’Y
FUSE D1
250V 3.15A

RY4

CN1

CN9 1 2 3 4 5 6 7 8

CN2 1 2

CN9 1 2 3 4 5 6 7 8

BLU

DISPLAY PCB AS

BLU

Figure 4--5 Ceiling Unit, Standard -- Ducted
T--298

2
1

4-2

RED
BLK

(+)
(--)

12 VDC POWER

PLUG CONNECTS TO CEILING UNIT.
SEE DIAGRAM SUPPLIED WITH
CEILING UNIT FOR ADDITIONAL
WIRING.

FAN MOTOR

OLP: OVERLOAD PROTECTION
PTC: START THERMISTER
RVC: REVERSING VALVE COIL

4P

4P
1
2

BLK

1

1

BLU

2

2

WHT

3

GRN/YEL

4

3

3

4

4

BLK
BLU

GRN/YEL

WHT
BRN

GRN/YEL

BRN

EVAP.

CONTROL
BOX

WHT

2P

2P
BLK

1

1

2

2

RVC
BLK(BLU)

BRN

2

1

F
H

C

CAPACITOR

WHT
WHT

2P
1
BLK

RED

2

OLP
(IF USED)
1

2
(3)

BLU

RED

R
YEL

RED

PTC

C
S

FREEZE
SWITCH

BLU

COMPRESSOR

Figure 4--6 Heat Pump -- Upper Unit -- Free Blow

SW

4P

ORN

A

2

1

ORN

WHT
1 2
1 2

2P

ASW

BLK
HT

BLK

ORN

C

HEATER BT

BLK
115 VAC
SUPPLY
WIRE

B
3

BLK

{

YEL
RED

H
1
3
L IT

2P
BLK

2
1

ASM
2

2P
1

1
BRN

C
2

2
WHT

WHT

GRN/YEL

4
GRN/YEL

WHT
1

3

WHT

HEATER AS
L2

2

OFF

WIRING.
UPPER UNIT FOR ADDITIONAL

L
L1

SWITCH
POSITION

SEE DIAGRAM SUPPLIED WITH

BLU

1

PLUG CONNECTS TO UPPER UNIT.

BLK

H

CONTACTS MADE
NONE

LOW FAN

L1--L . L1--A

HIGH FAN

L1--H . L1--A

LOW COOL

L2--C . L1--L . L1--A . B--3

HIGH COOL

L2--C . L1--H . L1--A . B--3

HEATING

L2--HT . L1--L . L1--A . B--1

ASW

O (OFF)

2

1 (ON)

2 -- 1

LEGEND
ASM: AIR SWEEP MOTOR
ASW: AIR SWEEP SWITCH

CEC
YEL

2P

SW: SWITCH

1

IT:

2

CEC: CLOSED END CONNECTOR

WHT

BT:

INDOOR THERMOSTAT

BIMETAL

Figure 4--7 Heat Pump -- Ceiling Unit -- Free Blow

4-3

T--298

1
BRN

ODC Th

BLK

ODA Th

LEGEND

2

CN :HOUSING CONNECTOR

3

FAN MOTOR

CN

BLU

RVC :REVERSING VALVE COIL

BLU

2

ODA Th :OUTDOOR AIR THERMISTOR

RED

RED

GRN/YEL

3

3

ODC Th :OUTDOOR COIL THERMISTOR

GRN/YEL

WHT

5

4

PTC :START THERMISTOR
OLP :OVERLOAD PROTECTOR

BLK

1

2

BRN
6
BRN

CONTROL EVAP.
BOX

WHT

F
C

WHT

1

H

CAPACITOR

YEL

2

WIRING.

CEILING UNIT FOR ADDITIONAL

PLUG CONNECTS TO CEILING UNIT.
SEE DIAGRAM SUPPLIED WITH

BLK
1

COMPRESSOR

RED

OLP
1
BLK(BLU)

RVC

2

1

BLU

RED
R

(IF USED)
2
(3)

YEL

C

PTC
S

BLU

CN

Figure 4--8 Heat Pump -- Upper Unit -- Ducted

LEGEND

PLUG CONNECTS TO UPPER UNIT.

IDC Th: INDOOR COIL THERMISTER

NOTE

SEE DIAGRAM SUPPLIED WITH UPPER UNIT

RA Th: ROOM AIR THERMISTER

FOR ADDITIONAL WIRING.

ODC Th: OUTDOOR COIL THERMISTER
ODC

ODA Th :OUTDOOR AIR THERMISTOR

ODA

1 2 3

RVC: REVERSING VALVE COIL
D1: DIODE

BLK

K: RELAY

RVC

MOTOR

1 2

1 2 3 4

WHT

RED

BLU
BLK
RED

BLK

BRN
1 2 CN5

*

FACTORY WIRING

*

FIELD WIRING
(115VAC HIGH VOLT.)

*

FIELD WIRING
(12VDC LOW VOLT.)

COMPRESSOR
2 1
GRN/YEL

WHT
BLK

1 2 3 4 CN3

Y

CN5
1
2
3
RA Th

BLK

CN1
1
2
3
4

IDC Th

CONTROL PCB
ASS’Y

BRN

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

CN4
1
2
3
CN9

1 2 3 4 5 6 7 8

CN6

1
2
3
4
5
6
7
8
CN4

1
2
3

1
2
3

BLK
K7

K2

1 2 3 4 5 6 7 8

K1

K4

115VAC POWER
WHT

N1

GRN/YEL

POWER PCB ASS’Y
FUSE

D1
2

K6
250V 3.15A

1
CN1

CN6

BLU

1 2
BLU
FURNACE SIGNAL

DISPLAY PCB AS

Figure 4--9 Heat Pump -- Ceiling Unit -- Ducted

T--298

L
N2

CN2
CN9

K3

4-4

RED
BLK

(+)
12VDC POWER
(--)

Figure 4--10 Ceiling Unit -- Wall Thermostat -- Ducted & Free Blow

4.2 WALL MOUNTED THERMOSTATS
For proper wiring of Wall Mounted Thermostats as an accessory, refer to Figure 3-40 (Wall Thermostat Wiring
Diagram -- Cool Only Model) or Figure 3-41 (Wall Thermostat Wiring Diagram -- Heat/Cool Model).

4-5

T--298

INDEX

A

I

Air Handling System , 3-8

Indoor Thermostat , 3-3

Air Sweep Removal, 3-3

INTRODUCTION, 1-1, 4-1

Air Sweep Switch , 3-2

L
LCD DISPLAY, 3-15, 3-16

C

Leaks, 3-1

Capacitor Testing, 3-9

M

Capacitor Testing and Replacement, 3-9
Ceiling Grill -- Ducted, 3-4

Main Pcb Board, 3-5

Ceiling Grill -- Free Blow, 3-1

Master Control Switch, 3-2

Ceiling Panel -- Free Blow, 3-2

Motor , 3-7

CEILING UNIT -- DUCTED SYSTEMS, 3-4

Mounting, 3-1

CEILING UNIT -- FREE BLOW , 3-1
Cleaning, 3-1

P

Compressor , 3-6, 3-13

Painting, 3-1

Condenser Fan, 3-7

PCB Display , 3-5

Control Box -- Ducted, 3-4

PREVENTATIVE MAINTENANCE, 3-1

Control Box -- Upper Unit, 3-6
Controls, 3-1

R

Cool Only Thermostat, 3-15

REFRIGERANT CYCLE, 1-9, 1-10

D

S

Design Change, 1-1

Serial Number, 1-1
SERVICE -- GENERAL, 3-1
SERVICE -- UPPER UNIT -- LOW PROFILE, 3-10

E

SERVICE AND MAINTENANCE, 3-1

Evaporator Blower Wheel, 3-8

START--UP, 1-9

Exterior Cover, 3-5, 3-10, 3-15

T
F

THERMOSTAT INSTALLATION AND START--UP INSTRUCTIONS (WALL MOUNTED), 3-15

Filter Removal -- Free Blow, 3-1

TROUBLESHOOTING, 2-1, 2-3

Filter Removal -- Ducted, 3-4

U

Fuse Removal -- Ducted, 3-5

Upper Scroll Assembly, 3-7, 3-10, 3-11, 3-12, 3-13

H
W

Heat Strip, 3-3

WIRING SCHEMATICS, 4-1

Heat/Cool Thermostat, 3-15

Index -1

T--298

Carrier Transport Air Conditioning
50 Grumbacher Road
York PA 17402 USA
Tel: 1--800--673--2431
Fax: 1--717--764--0401

Carrier Transicold Division,
Carrier Corporation
Transport Air Conditioning Group
P.O. Box 4805
Syracuse, N.Y. 13221 U.S A
www.carrier.transicold.com

A member of the United Technologies Corporation family. Stock symbol UTX
©2006 Carrier Corporation D Printed in U. S. A. 0606



---

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