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 (minimum) before resume operation.
 • If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation
stop, although the unit is turn on again within the period.
 • This phenomenon is to balancethe pressure inside the refrigerant cycle.
8.5.2. Compressor Reverse Rotation Protection Control
 • If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and
indoor heat exchanger is 2.5°C (cooling mode)/5°C (heating mode) orless for continuous 2 minutes,compressor will stop and
restart automatically.
 • Time Delay Safety Control isactivated before the compressor restart.
sT = Intake air temperature - Indoor heat exchanger temperature
 • This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
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							(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 seconds in a normal operation although the intake
air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.
 • The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and
return back to the outdoor unit.
8.5.5. Starting Current Control
 • When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to
operate at 1.6 second later.
 • The reason of the difference isto reduce thestarting current flow.
8.5.6. Anti-Freezing Control
 • If the temperature of the indoor heat exchanger falls below 2°C continuously for 4 minutes or more, the compressor turns off.
The fan speed setting remains the same.
 • This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form
returning to the compressor.
 • Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).
 • Restart control (Time DelaySafety Control)will be applied in this Control if the recovery time is too short.
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							(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 cancelled immediately when abovecondition is changed, or Powerful button is pressed.
 • Anti-Dew formation is control by:
 1. CLo fan is changed to HLo fan.
 2. QLo fan is changed to HLo fan.
8.5.8. 30 Minutes Time Save Control
 • The compressor will startautomatically if it has stopped for 30 minutes and the intake air temperature falls between the
compressor OFF temperature (A) and compressor ON temperature (B) during the period.
 • This is to maintain the room temperature as set. Despite of this, it is to prevent a wrong judgement of intake air temperature due
to poor installation near the sensor area.
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							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. Nevertheless, is to protect the compressor
from overload of too high temperature.
8.5.10. 4-Way Valve Control
 • 4-wayvalvealways onduring Heating operation. (except deicing operation)
 • When the unit is switched off by remote control during Heatingoperation, the 4-way valve stayat Heating position for 5 minutes.
 • This is to prevent the refrigerantflow processsound for being occur.
8.5.11. Outdoor Fan Motor Control
 • When compressor stops (reaches room temperature), outdoor fanwill operate for 30 seconds (forced operation).
 • This is to release the heat and to obtain the lowest pressure as fast as possible.
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							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 OFF) during Heating operation.
 • For the first 30 sec. from compressor OFF (Thermo OFF), Indoor fan speed will operate accordingly to the Indoor heat
exchanger temperature as shown below:
 • After 30 sec. from compressor OFF (thermo OFF),Indoor fan will run at SSLo speed only.
 • Anti Cold Draft Control will stop when:
 − Intake temperature < set temperature. (Time DelaySafety Control 4minutes waiting is valid)
 − 30 Minutes Time Save Control activates.
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							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 the outdoor Fan OFF duration (due to overload control) is accumulated up to 60 minutes and
after compressor starts for 1 minutes, deicing starts.
 • Deicing ends when
 1. 12 minutes after deicing operation starts;
 2. TRS senses the outdoor piping temperature rises to 4°C (TRS OPEN).
Deicing will not end immediately astime delay(Td) is valid as shown below.
 • Once deicing operation starts, it will not end for 60 seconds.
 • After deicing operation, compressor stops for 30 seconds and 4-wayvalve stays at cooling position for 10 seconds.
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							Normal Deicing Time Diagram
Overload Deicing Time Diagram
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							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 Control will be activated.
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							 • 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, indoor fan will operate at Lo- forthe beginning 20 seconds to prevent higher volume of refrigerant
in liquid form returning to the compressor.
 5. After the compressor at turn off condition for 3 minutes, indoor fan will start to operate at Lo- to circulate the air in the room.
This is to obtain the actual reading of the intake air temperature.
 6. When the compressor resume operation, indoor fan will operate atMe fan speed (after 70 seconds from the restart of
compressor) to provide comfort and lesser noise environment.
 • Auto Fan Speed during Soft Dry operation:
 1. Indoor fan will rotate alternately between off and Lo-.
 2. At the beginning of each compressor start operation,indoor fan will increase fan speed gradually for deodorizing purpose.
 3. When compressor at turn off condition for 6 minutes, indoor fan will start fan speed at Lo- to circulate the air in the room.
This is to obtain the actual reading of intake air temperature.
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							(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 prevention, Airflow Direction
Auto-control angle change from 0°-32° to 20°-30° under
Cooling and Soft Dry operation mode.Cooling and Soft Dry Operation
 • Auto Fan Speed during Heating operation.
 1. Indoor fan will rotate in the range of SLo→Me according to the heat exchanger temperature.
8.6.3. Manual Fan Speed Control
 • Manual fan speed adjustment can be carried out by using the Fan Speed selection button at the remote control.
 • There are 3 types of fan speed settings: Lo, Me, Hi.
8.7. Outdoor Fan Speed Control
 • There is only onespeed for outdoor fan motor.
 • When the air conditioner is turned on, the compressor and the outdoor fan will operate simultaneously.
 • Likewise, both compressor and outdoor fanwill stop at the same time if the unit is turned off.
8.8. Vertical Airflow Direction Control
8.8.1. Auto Control
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