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

7
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

8
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

10
INDOOR UNIT 42QH-H SERIES HEAT PUMP
WIRING DIAGRAM
INDOOR UNIT 42QH-C SERIES COOL ONLY
WIRING DIAGRAM
11. WIRING DIAGRAMS
0350151

11
OUTDOOR UNIT 38QH-H SERIES HEAT PUMP
WIRING DIAGRAM
OUTDOOR UNIT 38QH-C SERIES COOL ONLY
WIRING DIAGRAM
WIRING DIAGRAMS (CONT.)

12
12. FIELD ELECTRICAL CONNECTIONS MATCHING
HEAT PUMP SYSTEM OUTDOOR COOL ONLY SYSTEM
COIL
SENSOR
LEGEND
Note: The mains supply must be connected to the outdoor unit.
Earth
LLive power supply.
NNeutral power supply.
6Live connection indoor/outdoor unit.
5Neutral connection indoor/outdoor unit
4Compressor control.
3 Reversing valve control (Only for heat pump system)
2 Outdoor fan motor control (Only for heat pump system)
1Earth
200-240V ~ 50Hz
200-240V ~ 50Hz
ᄋOutdoor Unit
ᄌIndoor Unit
ᄍMain Switch
ᄎTime-delay fuse or circuit breaker

13
13. REFRIGERATION CYCLE
HEAT PUMP SYSTEM

14
REFRIGERATION CYCLE (Cont.)
COOL ONLY SYSTEM

15
14. SELF DIAGNOSTIC FUNCTION
14-1 INTRODUCTION
- Self-diagnostic function is the key for success of heat pump system.
- The printed circuit boards existing inside the indoor unit are equipped with self-diagnostic function to detect
malfunction and automatically stops the operation at the air conditioner after blinking of power or timer led as per
malfunction.
14-2 SELF DIAGNOSTIC FUNCTION
The self-diagnostic function included in the control system detects malfunctions of the following
components:
(1) Return Air Sensor
(2) Indoor Coil Sensor
(3) Outdoor Coil Sensor
(4) Compressor Drive
(5) Anti-overheat
(6) Low ambient
No. Malfunction
Reason
Power
Led
Timer
Led
1 Return Air Sensor - Blinking
2 Indoor Coil Sensor - Blinking
3 Outdoor Coil Sensor - Blinking
4 Compressor Overload Blinking -
5 Anti-overheat Blinking -
6 Low ambient Blinking -
Power led or
Timer led
Blinkin
g

16
15. AIR FILTER CLEANING
- The air filters supplied with the unit are high-efficiency washable and recyclable filters.
- To establish, how frequently these should be cleaned, the operating conditions must be
taken in to account.
- REMOVAL OF AIR FILTERS FOR CLEANING:
Open the return grille without removing the two screws and
the central clamp from their position.
Remove acrylic-fiber filters for cleaning.
- CLEANING OF ACRYLIC-FIBRE STANDARD FILTERS:
First clean the filter with a vacuum cleaner
every month.
Rinse filter under running water, and dry it
Notes: (1) After cleaning, put the filters back in the correct positions.
(2) Before operating the air conditioner, check that air filters are in their places inside
unit.

17
16. PERIODICAL CHECKS
For a good operation of the air conditioner it is recommended to carry out checks and
maintenance as indicated.
Recommended maintenance intervals may very depending on the installation environment,
e.g. dusty zones, etc.
Indoor Unit Every Month Every 4 Months Every Year
Clean air filter Ɣ(1)
Clean drain pipe (2) Ɣ
Change controller batteries Ɣ
Outdoor Unit Every Month Every 4 Months Every Year
Clean outdoor coil from outside (2) Ɣ
Clean outdoor coil from inside Ɣ
Blow air over electric parts (2) Ɣ
Check electric connection tightening (2) Ɣ
Clean fan wheel (2) Ɣ
Check fan tightening (2) Ɣ
Clean drain pan (2) Ɣ
(1) Increase frequency in dusty zones.
(2) Operations to be carried out by qualified service personnel.

18
17. TROUBLE SHOOTING
TROUBLE REASON ACTION
Compressor and outdoor fan will not
start
Power failure
Fuse blown or / and circuit breaker tripped
Detective contactor
Low line voltage
Incorrect or loose wiring
Temp. setting too low
Call power company
Replace fuse or reset circuit breaker
Replace
Determine cause and eliminate
Check wiring diagram and rewire correctly
Reset temp. setting
Compressor will not start, but outdoor
fan runs
Faulty wiring or loose connections in
compressor circuit
Compressor motor burned out, stuck or
internal over-load open
Detective run capacitor
Check wiring and repair or correct
Replace compressor and determine cause
Replace
Compressor runs bur cycles on
internal overload (other than normally
satisfying thermostat)
Refrigerant over or under charge
Air or non condensable refrigerant in
system
Detective compressor
Low or too high line voltage
Blocked outdoor coil
Outdoor fan stopped
Detective run capacitor
Faulty fan motor of outdoor section
Restriction in refrigerant system
Capillary or Accurate restricted or ice
clogged.
Blow refrigerant, evacuate system and
recharge
Blow refrigerant, evacuate system and
recharge
Replace and determine cause
Determine cause and correct
Determine cause and replace
Determine cause and replace
Replace
Replace
Locate restriction and remove
Blow refrigerant, evacuate system and
recharge
Compressor operates continuously System undersized for load
Temp. setting too low
Defective outdoor fan
Air or non condensable refrigerant in
system
Air restricted or indoor section filter dirty
Decrease load or increase system size
Reset temp. setting
Check for source and replace
Blow refrigerant, evacuate system and
recharge
Clean filter or remove restriction
Excessive head pressure Dirty outdoor coil
Detective outdoor fan
Refrigerant over charged
Air or non condensable refrigerant in
system
Outdoor section air restricted
Clean coil
Replace
Purge excess refrigerant
Blow refrigerant, evacuate system and
recharge
Remove restriction

19
TROUBLE SHOOTING (Cont.)
TROUBLE REASON ACTION
Head pressure too low Low refrigerant charge
Restriction in liquid tube
Indoor section air filter dirty
Check for leaks, repair and recharge
Remove restriction
Clear filter
Excessive section pressure Reversing valve hung up or internal leak
Internal pressure relief open
Refrigerant over charged
Replace
Check for source and eliminate
Purge excess refrigerant
Suction pressure too low
(Low pressure control cuts-out & pilot
light for low pressure control lights off)
Low refrigerant charge
Indoor unit frosted
Low indoor air or short cycling
Restriction in suction tube
Capillary or accurate restricted or ice clogged
Check for leaks, repair and recharge
See next trouble
Eliminate cause, check for fan working
Locate restriction and remove
Blow refrigerant, evacuate system and
recharge
Outdoor fan stopped or cycling on
overload
Detective fan motor capacitor
Loose leads at fan motor
Fan motor burned out
Motor bearing sized
Replace
Check for cause and eliminate
Replace
Check for cause and eliminate
After batteries have been placed into
the remote control, the display is not lit.
Batteries are exhausted or have the wrong
polarity.
Replace batteries or check polarity.
When pressing the recessed lock
adjustment button, hour figures on
display do not flash.
Recessed button has not been pressed
correctly.
Press with a round point, avoid exerting
strong pressure
Recessed button for time setting is blocked due
to excessive pressure during use.
Check and repair.When pressing any button, all symbols
appear on display.
Remote control has been irreversibly damaged. Replace with a new one.
Main switch is OFF. Switch it to ON position.
Remote control batteries are exhausted. Replace batteries.
Remote control has not been pointed correctly
to the receiver of indoor unit.
Turn remote control OFF and repeat the
operation in the correct direction.
There are obstacles (curtains, walls, etc.)
between the remote control and the indoor unit
Repeat the operation after having
removed the obstacles.
Receiver on the indoor unit or the remote
control is under intense sun radiation.
Avoid direct sun on the unit, shut curtains
or shades.
When pressing start button, unit does
not acknowledge signal with a beep.
Signal transmission is obstructed by severe
interference from an electromagnetic field.
Avoid sending signals when computers or
household appliances (Food processors,
coffee makers, etc.) are operating close
by cellular or cordless telephones may
also interfere with the control.