Panasonic CS-A7DKD / CU-A7DKD / CS-A9DKD / CU-A9DKD / CS-A12DKD / CU-A12DKD Service Manual ▷ View online
−
Release the generator complete wire (green and red).
(Fig. 8)
(Fig. 8)
−
Remove 2 screws on the right and 1 screw at the left
side of the control board. (Fig. 7)
side of the control board. (Fig. 7)
−
Press down the hook on the left side of control board.
(Fig. 7)
(Fig. 7)
−
Then pull out the Control Board Complete from the unit.
(Fig. 7)
(Fig. 7)
Fig. 9
−
Remove the cross flow fan bushing from the chassis.
(Fig. 9)
(Fig. 9)
−
Loosen the fan boss screw at the cross flow fan. (Fig. 9)
Fig. 10
−
Push up the evaporator and remove cross flow fan by
pulling both cross flow fan and fan motor. (Fig. 10)
pulling both cross flow fan and fan motor. (Fig. 10)
12.4. Auto OFF/ON Button
•
The “Auto OFF/ON Button” (behind the front grille) is used to operate the air conditioner if remote control is misplaced or
mulfunctioning.
mulfunctioning.
•
Forced cooling operation is possible by pressing the “Auto OFF/ON Button” for more than 5s where “beep” sound is heard then
release the button.
release the button.
•
User able to select remote control transmission code and toggle remote control signal receiving sound under various setting
mode.
mode.
•
To enter various setting mode:
−
Press the “Auto OFF/ON Button” continuously for 5s (“beep” sound is heard) and release.
−
Within 20s, press the “Auto OFF/ON Button” continuously for 5s again (2 “beep” sound is heard) and release.
−
Various setting mode has limit up to 20s. Then return to normal operation.
12.4.1. Toggle Remote Control Signal Receiving Sound
•
Under various setting mode, press the “Auto OFF/ON Button” to toggle the remote control sound.
−
Short “beep”: Turn ON remote control signal receiving sound.
65
CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12DKD /
•
When the batteries are inserted for the first time or the
batteries are replaced, you may notice the indications at
remote control’s display screen blink continuously and not
functionable. If this condition happens, try to reset the
remote control by pushing the reset terminal with a pointing
device.
batteries are replaced, you may notice the indications at
remote control’s display screen blink continuously and not
functionable. If this condition happens, try to reset the
remote control by pushing the reset terminal with a pointing
device.
•
You may also do the reset to erase the setting at remote
control and restore back the default setting.
control and restore back the default setting.
−
Long “beep”: Turn OFF remote control signal receiving sound.
•
After “Auto OFF/ON Button” is pressed, the 20s counter for various setting mode is restarted.
12.4.2. Select Remote Control Transmission Code
•
There are 4 types of remote control transmission code could be selected and stored in EEPROM of indoor unit. The indoor unit
will only operate when received signal with same transmission code from remote control. This could prevent signal interference
when there are 2 or more indoor unit installed nearby together.
will only operate when received signal with same transmission code from remote control. This could prevent signal interference
when there are 2 or more indoor unit installed nearby together.
•
To change remote control transmission code, short or open jumpers at the remote control printed circuit board.
•
Under various setting mode, after select the transmission code combination of remote control, press any button of remote
control to transmit a signal to indoor unit. The transmission code will be stored in EEPROM.
control to transmit a signal to indoor unit. The transmission code will be stored in EEPROM.
•
After signal is received, the various setting mode is cancelled and return to normal operation.
12.5. Remote Control Reset
66
CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12DKD /
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table to the right.
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table to the right.
13 Troubleshooting Guide
13.1. Refrigeration Cycle System
67
CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12DKD /
13.2. Relationship Between The Condition Of The Air Conditioner And
Pressure And Electric Current
Cooling Mode
Heating Mode
Condition of the air
conditoner
Low Pressure
High Pressure
Electric current
during operation
Low Pressure
High Pressure
Electric current
during operation
Insufficient refrigerant
(gas leakage)
(gas leakage)
Clogged capillary tube
or Strainer
or Strainer
Short circuit in the
indoor unit
indoor unit
Heat radiation
deficiency of the
outdoor unit
deficiency of the
outdoor unit
Inefficient compression
•
Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.
13.3. Diagnosis Methods Of A Malfunction Of A Compressor And 4-way
Valve
Nature of fault
Symptom
•
Electric current during operation becomes approximately 20% lower than the normal value.
Insufficient compressing of a compressor
•
The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).
•
The difference between high pressure and low pressure becomes almost zero.
•
Electric current reaches a high level abnormally, and the value exceeds the limit of an
ammeter. In some cases, a breaker turns off.
ammeter. In some cases, a breaker turns off.
Locked compressor
•
The compressor is a humming sound.
•
Electric current during operation becomes approximately 80% lower than the normal value.
Insufficient switches of the 4-way valve
•
The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the 4-way valve becomes almost zero.
suction tube to the 4-way valve becomes almost zero.
68
CS-A7DKD CU-A7DKD / CS-A9DKD CU-A9DKD / CS-A12DKD CU-A12DKD /
Click on the first or last page to see other CS-A7DKD / CU-A7DKD / CS-A9DKD / CU-A9DKD / CS-A12DKD / CU-A12DKD service manuals if exist.