Panasonic CS-C18CKE / CU-C18CKE / CS-C24CKE / CU-C24CKE Service Manual ▷ View online
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.
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.
gauge does not move after approximately five minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS LEAKAGE.
AVOID GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump.
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.
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:
53
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
(Lack of refrigerant in the refrigeration cycle)
Procedure:
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. Connect the charge set’s centre hose to refrigerant
reclaiming equipment.
•
•
•
• 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.
5. Turn on refrigerant reclaiming equipment.
11.1.4. Balance refrigerant of the 2-way, 3-way valves
54
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
(No refrigerant in the refrigeration cycle)
Procedure:
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
55
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
(After Evacuation)
Procedure:
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.
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).
careful of the liquid refrigerant).
3. Open the valve (Low side) on the charge 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)
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 from the gas side, absolutely do
no attempt to charge with large amount of liquid refrigerant
while operating the air conditioner.
charging with liquid refrigerant from 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 partway will 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.
conditioner before disconnecting the hose.
5. Mount the valve stem caps 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.
11.1.6. Gas charging
56
CS-C18CKE CU-C18CKE / CS-C24CKE CU-C24CKE
Click on the first or last page to see other CS-C18CKE / CU-C18CKE / CS-C24CKE / CU-C24CKE service manuals if exist.