Panasonic Cs A18gkh Cs A24gkh Series Repair Manual

							© 2006 Panasonic HA Air-Conditioning (M) Sdn. Bhd.
(11969-T). All rights reserved. Unauthorized copying
and distribution is a violation of law.
Order No. MAC0611056C3
Air Conditioner
CS-A18GKH CU-A18GKH
CS-A24GKH CU-A24GKH
TABLE OF CONTENTS
PA G E PA G E
1 Safety Precaution------------------------------------------------2
2 Specifications-----------------------------------------------------4
2.1. CS-A18GKH  CU-A18GKH ----------------------------- 4
2.2. CS-A24GKH CU-A24GKH ------------------------------ 6
3Features-------------------------------------------------------------8
4 Location of Controls and Components-------------------9
4.1. Product Overview------------------------------------------ 9
5Dimensions--------------------------------------------------------10
5.1. Indoor Unit--------------------------------------------------10
5.2. Outdoor Unit ----------------------------------------------- 11
6 Refrigeration Cycle Diagram--------------------------------12
7 Block Diagram----------------------------------------------------13
8 Wiring Connection Diagram---------------------------------14
9 Electronic Circuit Diagram-----------------------------------15
10 Printed Circuit Board-------------------------------------------16
10.1. Indoor Unit (Main Printed Circuit Board) ------------16
10.2. Indoor Unit (Power Printed Circuit Board) ----------18
10.3. Outdoor Unit (Main Printed Circuit Board) ---------1910.4. Indicator panel -------------------------------------------- 20
11 Installation Instruction----------------------------------------21
11.1. Indoor Unit ------------------------------------------------- 22
11.2. Outdoor Unit ----------------------------------------------- 25
12 Operation and Control----------------------------------------27
12.1. Heating Operation --------------------------------------- 27
12.2. Cooling Operation---------------------------------------- 28
12.3. Soft Dry Operation --------------------------------------- 29
12.4. Automatic Operation ------------------------------------ 30
12.5. Operation Control ---------------------------------------- 31
12.6. Indoor Fan Speed Control ----------------------------- 37
12.7. Outdoor Fan Speed Control --------------------------- 39
12.8. Vertical Airflow Direction Control --------------------- 39
12.9. Horizontal Airflow Direction Control ----------------- 40
12.10. Powerful Operation -------------------------------------- 41
12.11. Quiet Operation------------------------------------------- 42
12.12. Timer Control ---------------------------------------------- 43
12.13. Random Auto Restart Control ------------------------ 44 
						

							2 12.14. Remote Control Signal Receiving Sound ---------- 44
12.15. Patrol Operation ------------------------------------------ 44
12.16. e-ion Operation ------------------------------------------- 46
13 Servicing Mode--------------------------------------------------49
13.1. Auto OFF/ON Button ------------------------------------ 49
13.2. Select Remote Control Transmission Code ------- 49
13.3. Remote Control Button --------------------------------- 50
14 Troubleshooting Guide----------------------------------------51
14.1. Refrigeration Cycle System --------------------------- 51
15 Disassembly and Assembly Instructions---------------5315.1. Indoor Electronic Controllers and Control
Board Removal Procedures -------------------------- 53
15.2. Indoor Fan Motor and Cross Flow Fan
Removal Procedures ----------------------------------- 56
16 Technical Data---------------------------------------------------58
16.1. Thermostat Characteristics---------------------------- 58
16.2. Operation Characteristics ----------------------------- 59
17 Exploded View and Replacement Parts List-----------67
17.1. Indoor Unit ------------------------------------------------- 67
17.2. Outdoor Unit ---------------------------------------------- 69
1 Safety Precaution
• Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing.
• Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and
main circuit for the model installed.
• The caution items stated here must be followed because these important contents are related to safety. The meaning of each
indication used is as below. Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage, and
the seriousness is classified by the following indications.
• The items to be followed are classified by the symbols:
• Carry out test running to confirm that no abnormality occurs after the servicing. Then, explain to user the operation, care and
maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference.
This indication shows the possibility of causing death or serious injury.
This indication shows the possibility of causing injury or damage to properties.
This symbol denotes item that is PROHIBITTED from doing.
1. Engage dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause water 
leakage, electrical shock or fire.
2. Install according to this installation instruction strictly. If installation is defective, it will cause water leakage, electrical shock or fire.
3. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, 
fire or electrical shock.
4. Install at a strong and firm location which is able to withstand the sets weight. If the strength is not enough or installation is not properly 
done, the set will drop and cause injury.
5. For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single 
outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.
6. Use the specified cable and connect tightly for indoor/outdoor connection. Connect tightly and clamp the cable so that no external force will 
be acted on the terminal. If connection or fixing is not perfect, it will cause heat-up or fire at the connection.
7. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause 
heat-up at connection point of terminal, fire or electrical shock.
8. When connecting the piping, do not allow air or any substances other than the specified refrigerant to enter the refrigeration 
cycle. Otherwise, this may lower the capacity, cause abnormally high pressure in the refrigeration cycle, and possibly result in 
explosion and injury. 
						

							3
9. It is desirable that the amount of residual oil is less than 40 mg/10 m.
10. Do not modify the length of the power supply cord or use of the extension cord, and do not share the single outlet with other 
electrical appliances. Otherwise, it will cause fire or electrical shock.
1. The equipment must be earthed. It may cause electrical shock if grounding is not perfect.
2. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of 
the unit, it may cause fire.
3. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the 
furniture.
4. Pb free solder has a higher melting point than standard solder; typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use a high 
temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).Pb free solder 
will tend to splash when heated too high (about 1100°F/600°C).
1. Selection of the installation location. Select an installation location which is rigid and strong enough to support or hold the unit, and select 
a location for easy maintenance.
2. Power supply connection to the conditioner. Connect the power supply cord of the air conditioner to the mains using one of the following 
methods.
Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency. 
In some countries, permanent connection of this room air conditioner to the power supply is prohibited.
1. Power supply connection to the receptacle using a power plug. Use an approved power plug with earth pin for the connection to the 
socket.
2. Power supply connection to a circuit breaker for the permanent connection. Use an approved circuit breaker for the permanent 
connection. It must be a double pole switch with a minimum 3.5 mm contact gap.
3. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigeration parts. Take care of 
the liquid refrigerant, it may cause frostbite.
4. Installation work. It may need two people to carry out the installation work.
5. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc. 
						

							4
2 Specifications
2.1. CS-A18GKH  CU-A18GKH
ITEM UNIT INDOOR UNIT OUTDOOR UNIT
Performance Test ConditionNEW JIS
C
O
O
L
I
N
GCapacitykW 5.4 - 5.4
BTU/h 18,400 - 18,400
EERW/W 3.21 - 3.12
BTU/hW 10.95 - 10.64
Noise Level dB (A) High 43 - 43, Low 38 - 38 High 53 - 54
H
E
A
T
I
N
GCapacitykW 5.90 - 6.00
BTU/h 20,100 - 20,500
COPW/W 3.62 - 3.53
BTU/hW 12.33 - 12.06
Noise Level dB (A) High 42 - 42, Low 38 - 38 High 54 - 55
Moisture RemovalI/h 2.9
pt/h 6.1
Lo
m
3/min (ft3/min)Cooling; 13.0 (460) - 13.0 (460)
Heating; 14.2 (500) - 14.2 (500)28.6 (1,010) - 32.4 (1,140)
Air VolumeMe
m
3/min (ft3/min)Cooling; 14.4 (510) - 14.4 (510)
Heating; 14.8 (520) - 14.8 (520)—
Hi
m
3/min (ft3/min)Cooling; 15.3 (540) - 15.3 (540)
Heating; 16.0 (560) - 16.0 (560)50.7 (1,790) - 52.7 (1,860)
SHi
m
3/min (ft3/min)Cooling 15.6 (550) - 15.6 (550)—
Refrigeration Control Device — Capillary Tube
Refrigeration Oil
cm
3—SUNISO 4GDID or ATMOS
M60 or ATMOS 56M (1,000)
Refrigerant (R22) g (oz) — 1,710 (60.4)
DimensionHeight mm (inch) 275 (10-13/16) 750 (29-17/32)
Width mm (inch) 998 (39-9/32) 875 (34-7/16)
Depth mm (inch) 230 (9-1/16) 345 (13-19/32)
Net Weight kg (lbs) 11.0 (24) 60.0 (132)
Pipe DiameterGas mm (inch) 12.7 (1/2)
Liquid mm (inch) 6.35 (1/4)
Standard Length m (ft) 5 (16.4)
Pipe Length Range m (ft) 3 (9.8) ~ 25 (82.0)
Height Difference m (ft) 20.0 (65.6)
Additional Gas Amount g/m (oz/ft) 20 (0.2)
Refrigeration Charges Less m (ft) 7.5 (24.6)
Drain HoseInner Diameter mm 16 —
Length mm 650 —
CompressorTy p e —Rotary (1 cylinder)
rolling piston type
Motor Type — Induction (2-pole)
Rated Output kW — 1.5
FanType Cross-Flow Fan Propeller Fan
Material ASHT-18 PP
Motor Type Transistor (8-poles) Induction (6-poles)
Input Power W — 116 - 127
Output Power W 30 80
Fan
SpeedLo
rpmCooling; 1,190 - 1,190
Heating; 1,270 - 1,270460 - 520
Me
rpmCooling; 1,320 - 1,320
Heating; 1,320 - 1,320—
Hi
rpmCooling; 1,400 - 1,400
Heating; 1,430 - 1,430815 - 845
Shi rpm Cooling; 1,430 - 1,430 —
Heat ExchangerFin Material Aluminium (Pre Coat) Aluminium
Fin Type Slit Fin Corrugated Fin
Row x Stage X FPI 2 x 15 x 21 2 x 28 x 16
Size (W x H x L) mm810 x 315 x 25.4 44 x 711.2 x 791
826
Air FilterMaterial Polypropelene —
Type One-Touch — 
						

							5 1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air
temperature of 35°C D.B. (95°F D.B.), 24°C D.B. (75.2°F W.B.)
2. Heating capacities are based on indoor temperature of 20°C D.B. (68°F D.B.) and outdoor air temperature of 7°C D.B. (44.6°F
D.B.), 6°C W.B. (42.8°F W.B.)
Note
• Specifications are subject to change without notice for further improvement.
ITEM UNIT
Power Source (Phase, Voltage, Cycle) ø Single
V 220 - 240
Hz 50
Input Power kW Cooling: 1.68 - 1.73
Heating: 1.63 - 1.70
Starting Current A 47
Running Current A Cooling: 7.8 - 7.5
Heating: 7.6 - 7.5
Power Factor % Cooling: 98 - 96
Heating: 97 - 94
Power factor means total figure of compressor, indoor fan motor and outdoor fan motor.
*Maximum over current protection A 10.2
Number of Core
3 (1.5mm
2)
Power Cord Length m 1.9
Thermostat—
Protection DeviceInner Protector 
						

							6
2.2. CS-A24GKH CU-A24GKH
ITEM UNIT INDOOR UNIT OUTDOOR UNIT
Performance Test ConditionNEW JIS
C
O
O
L
I
N
GCapacitykW 7.03 - 7.03
BTU/h 24,000 - 24,000
EERW/W 2.77 - 2.72
BTU/hW 9.45 - 9.30
Noise Level dB (A) High 47 - 47, Low 41 - 41 High 53 - 54
H
E
A
T
I
N
GCapacitykW 7.80 - 7.80
BTU/h 26,600 - 26,600
COPW/W 3.08 - 3.05
BTU/hW 10.51 - 10.39
Noise Level dB (A) High 46 - 46, Low 41 - 41 High 54 - 55
Moisture RemovalI/h 4.0
pt/h 8.5
Lo
m
3/min (ft3/min)Cooling; 13.7 (480) - 13.7 (480)
Heating; 14.7 (520) - 14.7 (520)28.1 (990) - 31.7 (1,120)
Air VolumeMe
m
3/min (ft3/min)Cooling; 15.8 (560) - 15.8 (560)
Heating; 15.8 (560) - 15.8 (560)—
Hi
m
3/min (ft3/min)Cooling; 16.8 (590) - 16.8 (590)
Heating; 17.6 (620) - 17.6 (620)49.7 (1,750) - 51.7 (1,830)
SHi
m
3/min (ft3/min)Cooling 17.7 (630) - 17.7 (630)—
Refrigeration Control Device — Capillary Tube
Refrigeration Oil
cm
3—SUNISO 4GDID or ATMOS
M60 or ATMOS 56M (1,130)
Refrigerant (R22) g (oz) — 2,050 (72.4)
DimensionHeight mm (inch) 275 (10-13/16) 750 (29-17/32)
Width mm (inch) 998 (39-9/32) 875 (34-7/16)
Depth mm (inch) 230 (9-1/16) 345 (13-19/32)
Net Weight kg (lbs) 11.0 (24) 63.0 (139)
Pipe DiameterGas mm (inch) 15.8 (5/8)
Liquid mm (inch) 6.35 (1/4)
Standard Length m (ft) 5 (16.4)
Pipe Length Range m (ft) 3 (9.8) ~ 25 (82.0)
Height Difference m (ft) 20.0 (65.6)
Additional Gas Amount g/m (oz/ft) 30 (0.3)
Refrigeration Charges Less m (ft) 7.5 (24.6)
Drain HoseInner Diameter mm 16 —
Length mm 650 —
CompressorTy p e —Rotary (1 cylinder)
rolling piston type
Motor Type — Induction (2-pole)
Rated Output kW — 2.0
FanType Cross-Flow Fan Propeller Fan
Material ASHT-18 PP
Motor Type Transistor (8-poles) Induction (6-poles)
Input Power W — 116 - 127
Output Power W 30 80
Fan SpeedLo
rpmCooling; 1,280 - 1,280
Heating; 1,380 - 1,380460 - 520
Me
rpmCooling; 1,480 - 1,480
Heating; 1,480 - 1,480—
Hi
rpmCooling; 1,570 - 1,570
Heating; 1,650 - 1,650815 - 845
Shi rpm Cooling; 1,650 - 1,650 —
Heat ExchangerFin Material Aluminium (Pre Coat) Aluminium
Fin Type Slit Fin Corrugated Fin
Row x Stage X FPI 2 x 15 x 21 2 x 28 x 18
Size (W x H x L) mm810 x 315 x 25.4 44 x 711.2 x 791
826
Air FilterMaterial Polypropelene —
Type One-Touch — 
						

							7 1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air
temperature of 35°C D.B. (95°F D.B.), 24°C D.B. (75.2°F W.B.)
2. Heating capacities are based on indoor temperature of 20°C D.B. (68°F D.B.) and outdoor air temperature of 7°C D.B. (44.6°F
D.B.), 6°C W.B. (42.8°F W.B.)
Note
• Specifications are subject to change without notice for further improvement.
ITEM UNIT
Power Source (Phase, Voltage, Cycle) ø Single
V 220 - 240
Hz 50
Input Power kW Cooling: 2.54 - 2.58
Heating: 2.53 - 2.56
Starting Current A 67
Running Current A Cooling: 12.3 - 12.2
Heating: 12.2 - 12.1
Power Factor % Cooling: 94 - 88
Heating: 94 - 88
Power factor means total figure of compressor, indoor fan motor and outdoor fan motor.
*Maximum over current protection A 16
Number of Core
3 (2.5mm
2)
Power Cord Length m 1.9
Thermostat—
Protection DeviceInner Protector 
						

							8
3Features
• High efficiency.
• Compact design.
• Wider range of horizontal discharge air.
• Air Filter with function to reduce dust and smoke.
• Automatic air swing and manual adjusted by Remote Control for horizontal and vertical airflow.
• Long installation piping up to 25 meter.
•Quality Improvement
- Random auto restart after power failure for safety restart operation.
- Gas leakage detection.
- Prevent Compressor reverse cycle.
- Inner protector to protect Compressor.
- Noise prevention during soft dry operation.
- Anti-dew formation control (Cooling & Soft Dry).
- Overload Protection Control (Heating).
- Outdoor Fan Control.
- Compressor High Pressure Control.
•Operation Improvement
- Quiet mode to provide quiet operation.
- Powerful mode to reach the desired room temperature quickly.
- 24-hour timer setting.
- Patrol sensor automatically detect the air quality. When the air quality is unsatisfactory, e-ion operation will start automatically.
- e-ion Air purifying System provides clean air by producing negative ions to attract dust which will then be captured at the pos-
itively charged e-ion filters.
•Serviceability Improvement
- Removable and washable Front Panel. 
						

							9
4 Location of Controls and Components
4.1. Product Overview
4.1.1. Indoor Unit
4.1.2. Outdoor Unit
4.1.3. Remote Control 
						

							10
5 Dimensions
5.1. Indoor Unit