Panasonic CS-A18DKD / CU-A18DKD / CS-A24DKD / CU-A24DKD Service Manual ▷ View online
11.1.2. Pumping down
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to
1. Confirm that both the 2-way and 3-way valves are set to
the opened position.
• Remove the valve stem caps and confirm that the valve
• 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
3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-way valve.
• Connect the charge hose with the push pin to the Gas
• Connect the charge hose with the push pin to the Gas
service port.
4. Air purging of the charge hose.
• Open the low-pressure valve on the charge set slightly
to purge air from the charge hose.
5. Set the 2-way valve to the closed position.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0 MPa (0 kg/cm
2
G).
If the unit cannot be operated at the cooling condition
(weather is rather cool), short the Pumping Down pins
on the Main Control P.C.B.
(Simply press the pumping down button if it is
equipped.)
So that the unit can be operated.
(weather is rather cool), short the Pumping Down pins
on the Main Control P.C.B.
(Simply press the pumping down button if it is
equipped.)
So that the unit can be operated.
7. Immediately set the 3-way valve to the closed position.
• Do this quickly so that the gauge ends up indicating 0.1
MPa (1 kg/cm
2
G) to 0.3 MPa (3 kg/cm
2
G).
8. Use refrigerant reclaiming equipment to collect
refrigerant from indoor unit and pipes.
9. Disconnect the charge set, and mount the 2-way and 3-
way valve’s stem caps and the service port caps.
• Use a torque wrench to tighten the service port cap to a
• Use a torque wrench to tighten the service port cap to a
torque of 18 N.m.
• Be sure to check for gas leakage.
10. Disconnect pipes from indoor unit and outdoor unit.
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CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD
11.1.3. Evacuation of Re-installation
WHEN REINSTALLING AN AIR CONDITIONER, BE SURE TO
EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES
in the following procedure.
EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES
in the following procedure.
1. Connect a charging hose with a push pin to the Low
side of a charging set and the service port of the 3-way
valve.
• Be sure to connect the end of the charging hose with the
valve.
• Be sure to connect the end of the charging hose with the
push pin to the service port.
2. Connect the centre hose of the charging set to a
vacuum pump.
3. Turn on the power switch of the vacuum pump and
make sure that the needle in the gauge moves from 0
MPa (0 cmHg) to -0.1 MPa (-76 cmHg). Then evacuate
the air for approximately ten minutes.
MPa (0 cmHg) to -0.1 MPa (-76 cmHg). Then evacuate
the air for approximately ten minutes.
4. Close the Low side valve of the charging set and turn
off the vacuum pump. Make sure that the needle in the
gauge does not move after approximately five minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS LEAKAGE.
gauge does not move after approximately five minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump.
6. Charge the pipes and indoor unit with gas refrigerant
6. Charge the pipes and indoor unit with gas refrigerant
from 3-way valve service port, and then discharge the
refrigerant until low side (gas side) gauge needle
indicates 0.3 MPa (3 kg/cm
refrigerant until low side (gas side) gauge needle
indicates 0.3 MPa (3 kg/cm
2
).
If air remain in the indoor unit and refrigeration pipes, it will
affect the compressor, reduce to cooling capacity, and could
lead to a malfunction.
affect the compressor, reduce to cooling capacity, and could
lead to a malfunction.
7. Tighten the service port cap at a torque of 18 N.m with
a torque wrench.
8. Remove the valve caps of the 2-way valve and the 3-
way valve. Position both of the valves to “open” using
a hexagonal wrench (4 mm).
a hexagonal wrench (4 mm).
9. Mount the valve caps onto the 2-way and 3-way valves.
• BE SURE TO USE REFRIGERANT RECLAIMING
EQUIPMENT
WHILE
DISCHARGING
THE
REFRIGERANT.
• Purge the air from charge set’s centre hose.
• Be sure to check for gas leakage.
• Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 MPA (0 cmHg)
to -0.1 MPa (-76 cmHg) in step (3) above, take the
following measures:
to -0.1 MPa (-76 cmHg) in step (3) above, take the
following measures:
If the leaks stop when the piping connections are
tightened further, continue working from step 3.
tightened further, continue working from step 3.
If the leaks do not stop when the connections are
retightened, repair the location of the leak.
retightened, repair the location of the leak.
Procedure:
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CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD
(Lack of refrigerant in the refrigeration cycle)
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to
1. Confirm that both the 2-way and 3-way valves are set to
the open position.
2. Connect the charge set to the 3-way valve’s service
port.
• Leave the valve on the charge set closed.
• Connect the charge hose with the push-pin to the
• Leave the valve on the charge set closed.
• Connect the charge hose with the push-pin to the
service port.
3. Connect the charge set’s centre hose to refrigerant
reclaiming equipment.
• Purge the air from charge hose.
• Purge the air from charge hose.
4. Open the valve (Low side) on the charge set and
discharge the refrigerant until the gauge indicates 0.05
MPa (0.5 kg/cm
MPa (0.5 kg/cm
2
G) to 0.1 MPa (1 kg/cm
2
G).
• If there is no air in the refrigeration cycle (the pressure
when the air conditioner is not running is higher than 0.1
MPa (1 kg/cm
MPa (1 kg/cm
2
G), discharge the refrigerant until the
gauge indicates 0.05 MPa (0.5 km/cm
2
G) to 0.1 MPa (1
kg/cm
2
G). 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 also be
discharged.
discharged.
5. Turn on refrigerant reclaiming equipment.
11.1.4. Balance refrigerant of the 2-way, 3-way valves
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CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD
(No refrigerant in the refrigeration cycle)
Procedure:
1. Connect the vacuum pump to the charge set’s centre
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. Close the valve (Low side) on the charge set, turn off
the vacuum pump, and confirm that the gauge needle
does not move (approximately 5 minutes after turning
off the vacuum pump).
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 oil becomes dirty or depleted,
replenish as needed.
replenish as needed.
11.1.5. Evacuation
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CS-A18DKD CU-A18DKD / CS-A24DKD CU-A24DKD
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