Panasonic Cs A9dkh Cu A9dkh Cs A12dkh Cu A12dkh Repair Manual

							DISPOSAL OFOUTDOOR UNITDRAIN WATER
 • If the drain elbow is used, the unit should be placed on a
stand which is taller than 3cm.
 • If the unit is used in an area where temperature falls below
0° C for 2 or 3 days in succession, it is recommended not to
use a drain elbow, for the drain water freezes and the fan
will not rotate.
CHECK THEDRAINAGE
 • Open front panel and remove air filters.
(Drainage checking can be carriedout without removing the
front grille.)
 • Pour a glass of water into the drain tray-styrofoam.
 • Ensure that water flows out from drain hose of the indoor
unit.
EVALUATION OF THEPERFORMANCE
 • Operate the unit at cooling operation mode for fifteen
minutes or more. • Measure the temperature of the intake and discharge air.
 • Ensure the difference between the intake temperature and
the discharge is more than 8°C.
10.6.5. CONNECT THE CABLE TO THE OUTDOOR UNIT
 1. Remove the control board cover from the unit by loosening the screw.
 2. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3 × 1.5 mm
2flexible cord,
type designation 245 IEC57 or heavier cord.
 3. Secure the cable onto the control board with the holder (clamper).
 4. Attach the control board cover back to the original position with the screw.
10.6.6. PIPE INSULATION
 1. Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram. Please wrap
the insulated piping end to prevent water from going inside the piping.
 2. If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by using POLY-E FOAM
with thickness 6 mm or above.
51
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							CHECK ITEMS
Is there any gas leakage at flare nut connections?
Has the heat insulation been carried out at flare nut
connection?
Is the connecting cable being fixed to terminal board firmly?
Is the connecting cable being clamped firmly?
Is the drainage OK?
(Refer to “Check the drainage” section)
Is the earth wire connection properly done?
Is the indoor unit properly hooked to the installation plate?
Is the power supplyvoltage complied with rated value?
Is there any abnormal sound?
Is the cooling operation normal?
Is the thermostat operation normal?
Is the remote control’s LCD operation normal?
Is the super alleru-buster filter installed?
52
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							11 2-way, 3-way Valve
2-way Valve (Liquid Side)3-way Valve (Gas Side)
WorksShaft PositionShaft PositionService Port
ShippingCloseCloseClose
(With valve cap)(With valve cap)(With cap)
EvacuationCloseCloseOpen
(Installation and(Counter-Clockwise)(Clockwise)(Push-pin)
Re-installation)
OperationOpenOpenClose
(With valve cap)(With valve cap)(With cap)
Pumping downCloseOpenOpen
(Transferring)(Clockwise)(Counter-Clockwise)(Connected manifo ld
gauge)
EvacuationOpenOpenOpen
(Servicing)With vacuumpump
Gas chargingOpenOpenOpen
(Servicing)(Withchargingcylinder)
Pressure checkOpen
(Servicing)OpenOpen(Connected manifo ld
gauge)
Gas releasingOpen
(Servicing)OpenOpen(Connected manifo ld
gauge)
53
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							Required tools: hexagonal wrench, adjustable wrench, torque
wrenches, wrench to hold the joints and gas leak detector.
The additional gas for air purging has been charged in the
outdoor unit.
However, if the flare connections have not been done correctly
and there gas leaks, a gas cylinder and the charge set will be
needed.
 1. Recheck the piping connections.
 2. Open thevalve stemof the2-wayvalvecounter-
clockwise approximately 90°, wait 10 seconds, and
then set it to closed position.
 • Be sure to use a hexagonal wrench to operate the valve
stem.
 3. Check for gas leakage.
 • Check the flare connection for gas leakage.
 4. Purge the air from the system
 • Set the 2-way valve to the open position and remove the
cap from the3-wayvalve’s service port.
 • Using the hexagonal wrench to press the valve core pin,
discharge for three seconds and then wait for one
minute.
Repeat this three times.
 5. Use torque wrench to tightenthe service port cap to a
torque of 1.8 kg.m. (18 N.m).The air in the indoor unit and in the piping must be purged. If air
remains in the refrigeration pipings, it will affect the
compressor, reduce the coolingcapacity, and could lead to a
malfunction.
 6. Set the 3-wayvalve to theopened position.
 7. Mount thevalve stemnuts to the2-way and 3-way
valves.
 8. Check for gas leakage.
 • At this time, especially check for gas leakage from the 2-
way and 3-way’s stem nuts,and from the service port
cap.
CautionIf gas leakage is discovered in step (3) above, take
the following measures:
Tighten the piping connections. If the leaks stop,
continue working from step (4).
If the gas leaks do not stop when the connections are
retightened, repair the location of the leak, discharge
all of the gas through the service port, and then
recharge with the specified amount of gas from a gas
cylinder.
11.1. Air Purging of the Piping and Indoor Unit
11.1.1. Air purging (Installation)
Service port cap
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gas
leakage from the refrigeration cycle.
Procedure:
54
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							 1. Confirm that both the 2-way and 3-wayvalves are set to
the opened position.
 • Remove the valve stem caps and confirm that the valve
stems are in the opened position.
 • Be sure to use a hexagonal wrench to operate the valve
stems.
 2. Operate the unit for 10 to 15 minutes.
 3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-wayvalve.
 • Connect the charge hose with the push pin to the Gas
service port.
 4. Air purging of the charge hose.
 • Open the low-pressure valveon the charge set slightly
to purge air from the charge hose. 5. Set the 2-wayvalve to theclose position.
 6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 1 kg/cm
2G (0.1 MPa).
 7. Immediately set the 3-way valve tothe closed position.
 • Do this quickly so that the gauge ends up indicating 3 to
5 kg/cm
2G (0.3 to 0.5 MPa).
 8. Disconnect the charge set, and mount the 2-way and 3-
way valve’s stemnuts and the service port caps.
 • Use a torque wrench to tighten the service port cap to a
torque of 1.8 kg.m (18 N.m).
 • Be sure to check for gas leakage.
11.1.2. Pumping down (Re-installation)
Procedure:
55
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							11.1.3. Re-air purging (Re-installation)
 1. Confirm that both the 2-way and 3-wayvalves are set to
the closed position.
 2. Connect the charge set and a charging cylinder to the
service port of the 3-wayvalve.
 • Leave the valve on the charging cylinder closed.
 3. Air purging.
 • Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the flare nut on
the 2-wayvalve approximately 45° for3 seconds then
closing it for 1 minute; repeat 3 times.
 • After purging the air, use a torque wrench to tighten the
flare nut onthe 2-wayvalve.
 4. Check for gas leakage.
 • Check the flare connections for gas leakage. 5. Discharge the refrigerant.
 • Close the valve on the charging cylinder and discharge
the refrigerant until the gauge indicates 3 to 5 kg/cm
2G
(0.3 to 0.5 MPa)
 6. Disconnect the charge set and the charging cylinder,
and set the 2-way and 3-wayvalves tothe open
position.
 • Be sure to use a hexagonal wrench to operate the valve
stems.
 7. Mount thevalve stemnuts and the service port cap.
 • Be sure to use a torque wrench to tighten the service
port cap to a torque 1.8 kg.m (18 N.m).
 • Be sure to check for gas leakage.
Procedure:
56
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							(Gas leakage)
 1. Confirm that both the 2-way and 3-wayvalves are set to
the open position.
 2. Connect the charge set tothe 3-way valve’s service
port.
 • Leave the valve on the charge set closed.
 • Connect the charge hose with the push pin to the
service port.
 3. Open the valves(Low side) on the charge set and
discharge the refrigerant until the gauge indicates 0.5
to 1 kg/cm
2G (0.05 to 0.1 MPa).
 • If there is no air in the refrigeration cycle [ the pressure
when the air conditioner is not running is higher than 1
kg/cm
2G (0.1 MPa) ], discharge the refrigerant until the
gauge indicates 0.5 to 1 kg/cm2G (0.05 to 0.1 MPa). If
this is the case, it will not be necessary to apply a
evacuation.
 • Discharge the refrigerant gradually; if it is discharged
too suddenly, the refrigeration oil will be discharged.
11.1.4. Balance refrigerant of the 2-way, 3-way valves
Procedure:
57
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							(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:
58
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							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 refrigerant fromthe 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:
59
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH / 
						

							 • 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
60
CS-A9DKH CU-A9DKH / CS-A12D KH CU-A12D KH /