Panasonic Cs A9dkh Cu A9dkh Cs A12dkh Cu A12dkh Repair Manual

 • The operation mode judging temperature and standard setting temperature canbe increased by 2°C permanently, by open the
circuit of JX1 at indoor electronic controller.
8.5. Operation Control
8.5.1. Restart Control (Time Delay Safety Control)
 • When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
 − Cooling/Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.
 − Soft Dry operation - the compressor stops for 6 minutes...

(For 8.5.3. to 8.5.7. information applies only to Cooling and Soft Dry Operation)
8.5.3. 7 Minutes Time Save Control
 • The compressor will startautomatically if it has stopped for 7 minutes and the intake air temperature falls between the
compressor ON temperature (A) and compressor OFF temperature (B) during the period.
 • This phenomenon is to reduce thebuilt up humidity inside a room.
8.5.4. 60 Seconds Forced Operation
 • Once the air conditioner is turned on, the compressor will not stop within 60...

(For 8.5.8. to 8.5.14. information applies only to Heating Operation)
8.5.7. Anti-Dew Formation Control
 • Purpose is to prevent dew formation on indoor unit air discharge area.
 • When room temperature is constant (±1°C) the following conditions occur for 30 minutes continuously, anti-dew formation will
activate:
 − Remote Control setting temperature is less than 25°C.
 − Compressor is on.
 − Cooling operation mode.
 − Indoor Fan motor operate at Low fan speed (CLo, Lo- or QLo).
 • This control is...

8.5.9. Compressor Overload Protection Control
Outdoor Fan Control
 • If the temperature of the indoor heat exchanger rises to 51°C, outdoor fan stops. The outdoor fan restarts when the indoor
heat exchanger temperature falls to 49°C.
Compressor high pressure protection
 • If the indoor heat exchanger becomes 65°C ormore, the compressor willstop and restart automatically.
(Time Delay Safety Control- 4 minutes waiting).
 • This is to reduce the pressure, as to reduce the indoor heat exchanger temp....

8.5.12. Hot Start Control
 • Hot Start Control is to prevent cool air discharge into the room when heating operation start.
 • When Heating operation starts, Indoor fan will not start until the indoor heat exchanger reaches 30°C as diagram shown.
 • Hot start is completed when indoor heat exchanger rises to 39°C or operation over 4 minutes.
8.5.13. Anti Cold Draft Control
 • This operation is to prevent the Cold Draft during Heating mode operation.
 • The operation will start when compressor OFF (Thermo...

8.5.14. Deicing Control
Deice starts to prevent frosting at outdoor heat exchanger.
 • Normal Deicing
Deice operations detection commences after 30 minutes of Heating operation starts or 60 minutes after previous deice
operation. If the TRS (Thermal Reed Switch) senses the outdoorpiping temperature drops to -3°C (TRS CLOSE) or less for
50 sec. continuously during compressor isin operation, deice will start.
(There is no detection during Outdoor Fan stops.)
 • Overload Deicing
During heating operation, if...

Normal Deicing Time Diagram
Overload Deicing Time Diagram
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CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 

8.6. Indoor Fan Speed Control
 • Indoor Fan Speed can be set using remote control.
8.6.1. Fan Speed Rotation Chart
Fan Speed (rpm)CS-A9DKHCS-A12DKH
SHi12701310
Hi11601280
Me9601120
HLo840960
CLo780880
Lo-750850
SLo700750
SS Lo300300
QSHi11701210
QHi10601180
QMe8601020
QHLo770890
QLo680780
8.6.2. Automatic Fan Speed Control
 • When set to Auto Fan Speed, the fan speed is adjusted between maximum and minimum setting as shown in the table.
 − Fan speed rotates in the range of Hi, Me and Lo-.
 − Deodorizing...

 • Auto Fan Speed during cooling operation:
 1. Indoor fan will rotate alternately between off and on as shown in below diagram.
 2. At the beginning of each compressor start operation,indoor fan will increase fan speed gradually for deodorizing purpose.
 3. For the first time the compressor operate, indoor fan will be switched to Hi fan speed from Lo- after 70 seconds from the
start of compressor. This cause the roomtemperature to achieve the setting temperature quickly.
 4. During compressor stop,...

(Cooling and Soft Dry Operation condition)
 • When the vertical airflow direction is set to Auto using the
remote control, the louver swings up and down as shown in
the diagram.
 • When stop operation using the remote control, the
discharge vent is reset, and stop at the closing position.
 • During Cooling operation or Soft Dry operation, indoor fan
motor may stop to rotate at certain periods. At that
condition, the louver will stop swinging and rest at the upper
limit.
 • During Anti-dew condensation...