Carrier 42QH30-H, 42QH30-C, 42QH36-H, 42QH36-C, 38QH30-H Service Maintenance Manual
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2005
SERVICE & MAINTENANCE MANUAL
1
TABLE OF CONTENTS
PAGE NO.
1. Precautions for Service & Maintenance 2
2. Split System Description 3
3. Unit Model Designation & Identification 4
4. Unit Models & Part Numbers 4
5. System Operating Limits 5
6. System Safety Protections 5
7. Exploded View of Indoor Unit 6
8. Part List of Indoor Unit 7
9. Exploded View of Outdoor Unit 9
10. Part List of Outdoor Unit 10
11. Wiring Diagrams 11
12. Field Electrical Connections Matching 13
13. Refrigeration Cycle 14
14. Self Diagnostic Function 16
15. Replacing Batteries of Remote Control 17
16. Emergency Operation of Air-Conditioner 17
17. Air Filter Cleaning 18
18. Periodical Checks 19
19. Trouble Shooting 20
2
1. PRECAUTIONS BEFORE INSTALLATION
SAFETY CONSIDERATIONS
• Service and maintenance of air conditioning equipment can be hazardous due to system pressures and
electrical components. Only trained and qualified service personnel should install, repair or service the air
conditioning equipment.
• When working on air conditioning equipment, observe precautions in the literature, tags and labels attached
to the unit and other safety codes.
• Wear safety glasses and gloves. Use quenching cloth and have fire extinguisher available for all brazing
operations
WARNING
• This manual describes the service and maintenance of Carrier split room air conditioner consisting of an outdoor unit
and an indoor unit manufactured by Carrier.
What is not covered in Carrier warranty?
1- Failure due to Misuse: Abusing, overloading, careless handling and negligence.
2- Failure due to Accident / Weather: Natural catastrophe, accident due to bad weather (Hail Storm, Sand Storm,
lightning, Flooding, Acid Rain and Air Borne fallout, etc).
3- Failure due to Damages during transport.
4- Failure due to modification: Any modifications done on the unit without Carrier consent.
5- Failure due to Improper Installation: Installation should be performed according to standard.
The decision of Carrier in ascertaining the same will be final. Carrier or its approved dealer should do
installation.
6- Failure due to Improper Maintenance: Lack of professional maintenance, improper adjustments, use of
improper consumables, filters, spare parts other than specified in the Carrier manuals.
7- Failure due to use of non-genuine Carrier Parts, substitute other than Carrier parts.
8- Refrigerant normal noise, wear and tear of deterioration.
9- Inconvenience or commercial loss is not covered.
The decision of Carrier in ascertaining the same will be final. Any such repairs will be carried out at the
expense of the purchaser.
3
2. SPLIT SYSTEM DESCRIPTION
(a) INDOOR UNIT
x Mounted inside the space to be air-conditioned.
x In summer it filters, dehumidifies and cools air.
x In winter it filters and heats air.
(g) DRAIN HOSE
x Drain the water condensated in the indoor
unit during cooling operation to the outside.
Fig. (1)
HI WALL SPLIT SYSTEMS
53QH-H SERIES HEAT PUMP
53QH-C SERIES COOL ONLY
(e) WIRELESS REMOTE CONTROL (LCD)
Controls on/off, mode, and fan speed,
temperature, timer and swing, and sleep
functions.
(b) OUTDOOR UNIT
x Mounted outside the space to be air-
conditioned.
x It contains compressor, fan, motor, condenser
coil, copper tubing and electrical components.
(f) REFRIGERANT PIPING LINES
Insulated copper piping through which refrigerant
R22 flow connects the indoor and outdoor units.
(c) RETURN AIR TO INDOOR UNIT
The return air from the space to be air-conditioned passes
through the front return grille and top the through the anti-
bacteria filters to clean the air from dust and foreign particles
(d) SUPPLY AIR FROM INDOOR UNIT
Cool or warm air comes out of supply
air outlet
4
3. UNIT MODEL DESIGNATION & IDENTIFICATION
UNIT MODEL DESIGNATION IDENTIFICATION (ID)
4. UNIT MODELS & PART NUMBERS
INDOOR UNIT
Heat Pump Cool Only
Model P/N ID Model P/N ID
42QH30-H 46303188 H 42QH30-C 46303186 C
42QH36-H 46303189 H 42QH36-C 46303187 C
OUTDOOR UNIT
Heat Pump Cool Only
Model P/N ID Model P/N ID
38QH30-H 46302173 H 38QH30-C 46302179 C
38QH36-H 46302177 H 38QH36-C 46302178 C
QH
42 = Indoor Unit
38 = Outdoor Unit
30
System
Cooling Capacity
At ARI Conditions
30 = 30,000 Btu/hr
36 = 36,000 Btu/hr
Unit Family
H
C
Unit Type
H = Heat Pump
C = Cool Only
42
38
5
5. SYSTEM OPERATING LIMITS
COOLING HEATING
Difference
Dry Bulb
Temp. C°
Wet Bulb
Temp. C°
Difference
Dry Bulb
Temp. C°
Wet Bulb
Temp. C°
Indoor temperature
Maximum
Minimum
32
21
23
15
Indoor temperature
Maximum 27 -
Outdoor temperature
Maximum
Minimum
55
21**
-
-
Outdoor temperature
Maximum 21 -
MAIN POWER SUPPLY
System
Model
Nominal
Power Supply
V/1PH/50HZ
Minimum
Voltage
Maximum
Voltage
Min. Voltage 200-240 180 264
Max. Voltage 220-240 198 264
NOTES:
* When the unit is operated above or below these limits for a long time, system diagnostics may detect
a malfunction and the unit will not operate properly.
6. SYSTEM SAFETY PROTECTIONS
6-1 FOR HEAT PUMP SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Cold draft prevention Indoor fan off Heating mode During unit operation
Defrost cycle Indoor fan off Heating mode During unit operation
Indoor coil
Freeze protection
Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling or heating
modes
At unit start-up or change of
operating mode
6-2 FOR COOL ONLY SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Indoor coil
Freeze protection
Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling mode
At unit start-up or change of
operating mode
WARNING:
During heat pump operation the system will undergo several defrost cycles to remove ice that might collect on the outdoor
unit in very low ambient temperature. In these cycles, the indoor fan will be automatically off and cannot operate until
defrost cycle is completed.
6
7. EXPLODED VIEW OF INDOOR UNIT
23
22
22
20
21
19
18
17
16
15
14
13
10
11
12
9
6
7
4
3
2
7
5
8
1
25
24.5
24.6
24.4
24.7
24.3
24.2
24.1
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