Panasonic CS-C18CKE / CU-C18CKE / CS-C24CKE / CU-C24CKE Service Manual ▷ View online
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.
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 the valve stem of the 2-way valve counter-
clockwise approximately 90°, wait 10 seconds, and
then set it to closed position.
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 the 3-way valve’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.
minute.
Repeat this three times.
5. Use torque wrench to tighten the 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
remains
in
the
refrigeration
pipings,
it
will
affect
the
compressor, reduce the cooling capacity, and could lead to a
malfunction.
malfunction.
6. Set the 3-way valve to the opened position.
7. Mount the valve stem nuts to the 2-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.
cap.
Caution
If gas leakage is discovered in step (3) above, take
the following measures:
the following measures:
If the leaks stop when the piping connections are
tightened further, continue working from step (4).
tightened further, 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.
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.
11.2. Air Purging of the Piping and Indoor Unit
11.2.1. 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.
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:
57
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
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.
•
•
•
• 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-way valve.
•
•
•
• 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 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
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).
•
•
•
• Be sure to check for gas leakage.
11.2.2. Pumping down (Re-installation)
Procedure:
58
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
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.
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.
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
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.
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).
•
•
•
• Be sure to check for gas leakage.
Procedure:
59
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
(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.
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
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.
11.2.4. Balance refrigerant of the 2-way, 3-way valves
Procedure:
60
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
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