Carrier 42QH30-H User manual

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.
xIn 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
27
5
8
1
25
24.5
24.6
24.4
24.7
24.3
24.2
24.1

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8. PART LIST OF INDOOR UNIT
QUANTITY / UNIT
42QH- H 42QH- C
NO. PART NAME PART
NUMBER
30 36 30 36
1 Mounting Bracket 02802426 1 1 1 1
2 Base Pan 02802427 1 1 1 1
3 End Plate Support – L 02802425 1 1 1 1
4 Blower L 02802434 1 1 1 1
5 Blower R 02802435 1 1 1 1
6 Bracket Motor 02802422 3 3 3 3
7 Center Bearing W/Bracket 02802423 1 1 1 1
8 Motor 02400017 1 1 1 1
9 Evap. Support-R 02802433 1 1 1 1
10 Evap. Support-L 02802432 1 1 1 1
11 Drain Hose Connector 02802399 1 1 1 1
12 Drain Hose 02802398 1 1 1 1
13 Horizontal Louver 02802424 1 1 1 1
14 Drain Pan 02802428 1 1 1 1
15 Step Motor MP35 02400015 1 1 1 1
16 Deflector 02802430 16 16 16 16
17 Bar Gang 02802431 4 4 4 4
18 Deflector with Arm 02802429 4 4 4 4
19 Evap. Coil-3R x 5C x 3/8” 02600159 1 1 1 1
20 Frame Grille 02802436 1 1 1 1
21 Screw Cover 02802400 4 4 4 4
22 Air Filter 02802401 2 2 2 2
23 Decorative Panel 02802437 1 1 1 1
24 Control Box Assy
Main PCB Cool/Heat 02503154 1 1
24.1 Main PCB Cool Only 02503186 1 1
24.2 Return Air Sensor 02503149 1 1 1 1
24.3 Indoor Coil Sensor 02503150 1 1 1 1
24.4 Capacitor 2.5 MF/ 450VAC 02400016 1 1 1 1
24.5 Lamp PCB/IR Receiver 02503151 1 1 1 1
24.6 Control Box 02503156 1 1 1 1
24.7 Auxiliary Switch 02503163 1 1 1 1
24.8 Wire Harness – Auxiliary Switch 02503162 1 1 1 1
24.9 Wire Harness – Lamp PCB 02503164 1 1 1 1
24.10 Extension Wire 8M 02503153 1 1
Remote Control Cool / Heat 02503155 1 1
25 Remote Control Cool Only 02503178 1 1
26 Battery size AAA-15.V 02501125 2 2 2 2

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9. EXPLODED VIEW OF OUTDOOR UNIT
18
5
2
9
8
6
10
12
13
7
1
14
16
15
4
20
3
11
17
20
19/5
19/2
19/3
19/3
19/1
19/6

9
10. PART LIST OF OUTDOOR UNIT
QTY./UNIT
38QH-H 38QH-C
SR. DESCRIPTION PART
NUMBER 30 36 30 36
1 COMPRESSOR COMPLETE WITH GROMMETS & SPACERS
1.1 Copeland Comp. CR37KQ-PFT 01500256 1 1
1.2 Copeland Comp. CR47KQ-PFZ 01500172 1 1
2 COND. BASE 08107402 1 1 1 1
3 SUPPORTING LEG ASSY 36314043 4 4 4 4
4 COND. PARTITION 06307407 1 1
06307436 1 1
5 CONDENSER COIL SUBASSY.
5.1 Cond. Coil 2 Row – 33.15” x 22” - 14FPI 02600234 1 1
5.2 Cond. Coil 2 Row – 33.15” x 28” - 15FPI 02600231 1 1
6 CONDENSER MOTOR SUPPORT SUBASSY. 36313880 1 1 1 1
7 CONDENSER MOTOR
7.1 Motor 1/10 HP-880 RPM 02400154 1 1
7.2 Motor 1/5 HP-860 RPM 02400179 1 1
8 PROPELLER C/W SOCKET SET SCREW 8 X 8 MM 02600441 1 1 1 1
9 ORIFICE PROPELLER 02803112 1 1 1 1
10 COND. SHROUD 08107406 1 1
06307435 1 1
21 CARRIER LOGO 02900615 1 1 1 1
12 HANDLE 02803110 1 1 1 1
13 GUARD PROPELLER 02803113 1 1 1 1
14 COND. BACK PANEL 06307409 1 1
06307434 1 1
15 COUPLING PANEL 06307410 1 1 1 1
16 SERVICE DOOR 02803106 1 1 1 1
17 COIL GUARD 02803114 1 1
02803115 1 1
18 COND. COVER 08107400 1 1 1 1
19 ELECTRICAL BOX SUBASSY 36314125 1
36314097 1
36314223 1
36314222 1
19.1 DUAL CAPACITOR
19.1.1 Dual Capacitor 50 + 5 MFD/440 VAC 02400379 1 1
19.1.2 Dual Capacitor 60 + 5 MFD/440 VAC 02400377 1 1
19.2 CONTACTOR FOR COMPRESSOR
19.2.1 Contactor 2 poles – 25 Amps 02400580 1 1
19.2.2 Contactor 2 poles – 30 Amps 02400572 1 1
19.3 TERMINAL BLOCKS
19.3.1 Terminal Block 6 Poles-30 Amps 02501433 1 1
19.3.2 Terminal Block 4 Poles-30 Amps 02501405 1 1
19.3.3 Terminal Block 3 Poles-30 Amps 02501315 1 1 1 1
19.4 COND. ELECTRICAL BOX 06307405 1 1 1 1
19.5 CAPACITOR CLAMP 02804078 1 1 1 1
19.6 SUPPORT CABLE 02802523 1 1 1 1
19.7 WIRE HARNESS SET 02500879 1 1
02500872 1 1
19.8 PTC STARTER FOR COMPRESSOR
19.8.1 PTC Starter Model SPP POW-R-PAK 02501579 1 1
19.8.2 PTC Starter Model SPP5 02501578 1 1
19.9 LOW PRESSURE CONTROL 02400638 1 1 1 1
19.10 PILOT LIGHT FOR LOW PRESSURE CONTROL 02502315 1 1 1 1
20 REVERSING VALVE & ELECTRIC COIL
02200404 1
02200406 1
21 ACCUMULATOR 02301012 1
02301013 1
22 SENSOR – OUTDOOR COIL 02503015 1 1
23 TUBING 36314124 1
36314096 1
36313934 1
36314193 1