Panasonic CS-C7DKD / CU-C7DKD / CS-C9DKD / CU-C9DKD / CS-C12DKD / CU-C12DKD Service Manual ▷ View online
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
stems are in the opened position.
stems are in the opened position.
•
Be sure to use a hexagonal wrench to operate the valve
stems.
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-way valve.
•
Connect the charge hose with the push pin to the Gas
service port.
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.
to purge air from the charge hose.
5. Set the 2-way valve to the close position.
6. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 1 kg/cm
2
G (0.1 MPa).
7. Immediately set the 3-way valve to the closed position.
•
Do this quickly so that the gauge ends up indicating 3 to
5 kg/cm
5 kg/cm
2
G (0.3 to 0.5 MPa).
8. Disconnect the charge set, and mount the 2-way and 3-
way valve’s stem nuts 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).
torque of 1.8 kg.m (18 N.m).
•
Be sure to check for gas leakage.
11.2.2. Pumping down (Re-installation)
Procedure:
57
CS-C7DKD CU-C7DKD / CS-C9DKD CU-C9DKD / CS-C12DKD CU-C12DKD
11.2.3. Re-air purging (Re-installation)
1. Confirm that both the 2-way and 3-way valves are set to
the closed position.
2. Connect the charge set and a charging cylinder to the
service port of the 3-way valve.
•
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-way valve approximately 45° for 3 seconds then
closing it for 1 minute; repeat 3 times.
charge set. Purge the air by loosening the flare nut on
the 2-way valve approximately 45° for 3 seconds then
closing it for 1 minute; repeat 3 times.
•
After purging the air, use a torque wrench to tighten the
flare nut on the 2-way valve.
flare nut on the 2-way valve.
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
the refrigerant until the gauge indicates 3 to 5 kg/cm
2
G
(0.3 to 0.5 MPa)
6. Disconnect the charge set and the charging cylinder,
and set the 2-way and 3-way valves to the open
position.
position.
•
Be sure to use a hexagonal wrench to operate the valve
stems.
stems.
7. Mount the valve stem nuts 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).
port cap to a torque 1.8 kg.m (18 N.m).
•
Be sure to check for gas leakage.
Procedure:
58
CS-C7DKD CU-C7DKD / CS-C9DKD CU-C9DKD / CS-C12DKD CU-C12DKD
(Gas leakage)
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
service port.
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
to 1 kg/cm
2
G (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
when the air conditioner is not running is higher than 1
kg/cm
2
G (0.1 MPa)], discharge the refrigerant until the
gauge indicates 0.5 to 1 kg/cm
2
G (0.05 to 0.1 MPa). If
this is the case, it will not be necessary to apply a
evacuation.
evacuation.
•
Discharge the refrigerant gradually; if it is discharged
too suddenly, the refrigeration oil will be discharged.
too suddenly, the refrigeration oil will be discharged.
11.2.4. Balance refrigerant of the 2-way, 3-way valves
Procedure:
59
CS-C7DKD CU-C7DKD / CS-C9DKD CU-C9DKD / CS-C12DKD CU-C12DKD
(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.]
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.
If the vacuum pump oil becomes dirty or depleted,
replenish as needed.
11.2.5. Evacuation (Installation)
Procedure:
60
CS-C7DKD CU-C7DKD / CS-C9DKD CU-C9DKD / CS-C12DKD CU-C12DKD
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