Panasonic Cs A7dkd Cs A9dkd Cs A12dkd Repair Manual

							(No refrigerant in the refrigeration cycle)
 1. Connect the vacuum pump to the charge set’s centre
hose.
 2. Evacuation for approximately one hour.
 • Confirm that the gauge needle has moved toward -0.1
MPa (-76 cmHg) [vacuum of 4 mmHg or less.]
 3. Closethe valve(Low side) on thecharge set, turn off
the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning
off the vacuum pump).
 4. Disconnect the charge hose from the vacuum pump.
 • Vacuum pump oil
If the vacuum pump oilbecomes dirtyor depleted,
replenish as needed.
11.1.5. Evacuation (Installation)
Procedure:
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							11.1.6. Gas charging
(After Evacuation)
 1. Connect the charge hose to the charging cylinder.
 • Connect the charge hose which you disconnected from
the vacuum pump to the valve at the bottom of the
cylinder.
 2. Purge the air from the charge hose.
 • Open the valve at the bottom of the cylinder and press
the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
 3. Open the valve(Low side) on thecharge set and charge
the system with liquid refrigerant.
 • If the system cannot be charged with the specified
amount of refrigerant, it can be charged with a little at a
time (approximately 150 g each time) while operating
the air conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1 minute and
then repeat the procedure. (pumping down-pin)
This is different from previous procedures. Because you are
charging with liquid refrigerantfrom the gas side, absolutely do
no attempt to charge with large amount of liquid refrigerant
while operating the air conditioner.
 4. Immediately disconnect the charge hose from the 3-
way valve’s service port.
 • Stopping partwaywill allow the refrigerant to be
discharged.
 • If the system has been charged with liquid refrigerant
while operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
 5. Mount thevalve stemcaps and the service port cap.
 • Use torque wrench to tighten the service port cap to a
torque of 18 N.m.
 • Be sure to check for gas leakage.
Procedure:
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							 • Electronic controller and Display Complete unit can be seen
by following the below removal procedures.
Fig. 1
 − Remove the 2 caps and 2 screws at the bottom of the
Front Grille. (Fig. 1)
Fig. 2
 − Remove the Front Grille Complete. (Fig. 2)
Fig. 3
 − Release the taps on top and on the right side of metal
plate cover. (Fig. 3)
 − Then remove the metal plate cover. (Fig. 3)
 − Remove the indicator complete screw, and then remove
the indicator complete. (Fig. 3)
12 Servicing Information
12.1. Distinction Of Lead Free (PbF) Printed Circuit Board
 • Printed circuit boards (manufactured) using lead free solder will have a PbF stamp on the Printed Circuit board.
CAUTION
 • Pb free solder has a higher melting pointthan standard solder;typically themelting point is 50 - 70°F (30 - 40°C) higher.
Please use a high temperature solder iron and 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).
 • If you must use Pb solder, please completely remove all of the Pb free solder on the pin or solder area before applying Pb
solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.
12.2. Indoor Electronic Controllers Removal Procedures
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							Fig. 4
 − To remove the electronic controller.
 − Release CN-FM connectors. (Fig. 4)
 − Release CN-Sonic connector. (Fig. 4)
 − Release CN-FB connector. (Fig. 4)
 − Release CN-ION connector. (Fig. 4)
 − Release CN-TH connector. (Fig. 4)
 − Release CN-STM connector. (Fig. 4)
 − Release CN-REC/DISP connector. (Fig. 4)
 • Remove Control Board Cover
Fig. 6
 − Remove the screw on the left of the unit. (Fig. 6)
 − Pull the hook to the left and lift up the evaporator.
(Fig. 6)
 − Pull down the Discharge Grille Complete. (Fig. 6)
Fig. 5
 − Press the hook to the right then take out the PCB. (Fig.
5)
 − ReleaseRy-Pwrconnector (black and brown) and Ac-
Wht connector from the PCB. (Fig. 5)
Fig. 7
Fig. 8
 − Remove indoor pipe sensor and air intake sensor from
the evaporator. (Fig. 7)
 − Remove the earth wire from the evaporator. (Fig. 7)
12.3. Indoor Fan Motor And Cross Flow Fan Removal Procedures
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							 − Release the generator complete wire (green and red).
(Fig. 8)
 − Remove 2 screws on the right and 1 screw at the left
side of the control board. (Fig. 7)
 − Press down the hook on the left side of control board.
(Fig. 7)
 − Then pull out the Control Board Complete from the unit.
(Fig. 7)
Fig. 9
 − Remove the cross flowfan bushing from the chassis.
(Fig. 9)
 − Loosen the fan boss screw at the cross flow fan. (Fig. 9)
Fig. 10
 − Push up the evaporator andremove crossflow fan by
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.
 • 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.
 • User able to select remote control transmission code and toggle remote control signal receiving sound under various setting
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.
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							 • 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.
 • You may also do the reset to erase the setting at remote
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 beselected and stored in EEPROM of indoor unit. The indoor unit
will only operatewhen received signal with same transmission code fromremote 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.
 • After signal is received, the various setting mode is cancelled and return to normal operation.
12.5. Remote Control Reset
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							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.
13 Troubleshooting Guide
13.1. Refrigeration Cycle System
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							13.2. Relationship Between The Condition Of The Air Conditioner And
Pressure And Electric Current
Cooling ModeHeating Mode
Condition of the air
conditonerLow PressureHigh PressureElectric current
during operationLow PressureHigh PressureElectric current
during operation
Insufficient refrigerant
(gas leakage)
Clogged capillary tube
or Strainer
Short circuit in the
indoor unit
Heat radiation
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 faultSymptom
 • Electric current during operation becomes approximately 20% lower than the normal value.
Insufficient compressing of a compressor • The discharge tube of the compressor becomes abnormallyhot (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.
Locked compressor
 • The compressor is a humming sound.
 • Electric current during operation becomes approximately 80% lower than the normal value.
Insufficient switchesof the4-way valve
 • The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the4-way valve becomes almost zero.
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							14 Technical Data
14.1. Thermostat Characteristics
14.1.1. CS-A7DKD / CS-A9DKD / CS-A12DKD
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							14.2. Operation Characteristics
14.2.1. CS-A7DKD CU-A7DKD
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