Panasonic CS-SA7CKP / CU-SA7CKP5 / CS-SC7CKP / CU-SC7CKP5 Service Manual ▷ View online
9.1. Evacuation of Installation
Required tools:
hexagonal wrench, adjustable wrench, torque wrench,
wrench to hold the joints, gas leak detector, charging set
and vaccuum pump
wrench to hold the joints, gas leak detector, charging set
and vaccuum pump
1. Connect a charging hose with a push pin to the Low
and High sides of a charging set and the service ports
of a 3-way valves.
of a 3-way valves.
Be sure to connect the end of the charging hose with the
push pin to the service port.
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
cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate
the air for approximately 10 minutes.
cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate
the air for approximately 10 minutes.
4. Close the valve of both the Low and High sides of the
charging set and turn off the vacuum pump. Make sure
that the needle in the gauge does not move after
approximately 5 minutes.
that the needle in the gauge does not move after
approximately 5 minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS REFRIGERANT LEAKAGE.
AVOID GAS REFRIGERANT LEAKAGE.
5. Disconnect the charging hose from the vacuum pump
and from the service ports of the 3-way valves.
The air in the indoor unit and in the piping must be purged.
If air remains in the refrigeration piping, it will affect the
compressor, reduce to cooling capacity, and could lead to a
malfunction.
If air remains in the refrigeration piping, it will affect the
compressor, reduce to cooling capacity, and could lead to a
malfunction.
6. Tighten the service port caps of both the 3-way valve
and the 2-way valve and at a torque of 18 N*m with a
torque wrench.
torque wrench.
7. Remove the valve caps of both the 3-way valves.
Position both of the valves to *open* using a hexagonal
wrench (4 mm).
wrench (4 mm).
8. Mount valve caps onto both of the 3-way valve and the
2-way valve.
Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 cmHg (0MPa) to -76
cmHg (-0.1MPa) in step (3) above, take the following
measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
cmHg (-0.1MPa) in step (3) above, take the following
measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
When installing an air conditioner, be sure to evacuate the air inside the indoor unit and pipes in the following procedutre.
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.
from the refrigeration cycle.
Procedure:
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CS-SA7CKP / CU-SA7CKP5 / CS-SC7CKP / CU-SC7CKP5
9.2. 2 Pumping down
1. Confirm that both 2-way and 3-way valves are set to open
positions.
•
•
•
• Remove the valve stem caps and confirm that the valve
stems are in the open position.
•
•
•
• Be sure using a hexagonal wrench to operate the valve
stems.
2. Operate the unit for 10-15 minutes.
3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-way valves.
•
•
•
• Connect the charge hose with the push pin to the
service port.
4. Air purging of the charge hose
•
•
•
• Open the low-pressure valve or 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 2 kg/cm
2
G (0.1Mpa).
•
•
•
• If the unit cannot be operate at the cooling mode
operation
(weather
is
rather
cool),
press
the
FORCE OPERATION
switch on the indoor unit, so
that the unit can be operated.
7. Immediately set 3-way valve to the closed position.
•
•
•
• Do this quick so that the gauge ends up indicating 1 to
3 kg/cm
2
G. (0.1 to 0.3 Mpa).
8. Disconnect the charge set, and mount the 2-way and 3-way
valve stem´s nuts and service port cap.
•
•
•
• Use torque wrench to tighten the service port cap to a
torque 1.8kg.m (18N.m).
•
•
•
• Be sure to check for gas leakage.
(For Re-installation)
Procedure
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CS-SA7CKP / CU-SA7CKP5 / CS-SC7CKP / CU-SC7CKP5
9.2.1. 2-1 Re-air purging
(Re-installation)
1. Connect a charging hose with a push pin to the Low
and High sides of a charging set and the service port of
the 3-way valve.
the 3-way valve.
Be sure to connect the end of the charging hose with the
push pin to the service port.
push pin to the service port.
2. Connect the center 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
cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate
the air for approximately 10 minutes.
cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate
the air for approximately 10 minutes.
4. Close the valve of both Low side and High side of the
charging set and turn off the vacuum pump. Make sure
that the needle in the gauge does not move after
approximately 5 minutes.
that the needle in the gauge does not move after
approximately 5 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.
Caution
If gauge needle does not move from 0 cmHg (0 MPa) to -76
cmHg (-0.1 MPa) in step (3) above, take the following
measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
cmHg (-0.1 MPa) in step (3) above, take the following
measures:
If the leaks stop when the piping connections are tightened
further, continue working from step (3).
If the leaks do not stop when the connections are retightened,
repair the location of the leak.
6. Tighten the service port caps of both the 3-way valve
and 2-way valve at a torque of 18 N *m with a torque
wrench.
wrench.
7. Remove the valve caps of both the valves. Position
both of the valves to *open* using a hexagonal wrench
(4 mm).
(4 mm).
8. Mount valve caps onto both the valves.
Procedure
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CS-SA7CKP / CU-SA7CKP5 / CS-SC7CKP / CU-SC7CKP5
9.2.2. 2-2 Balance refrigerant of the 2-way, 3-way valves
(Gas leakage)
Procedure
1. Confirm that both 2-way and 3-way valves are set to the open position.
2. Connect the charge set to the service port of the 3-way valve.
•
•
•
• 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 0.5-1kg/cm
2
G (0.05-
0.1Mpa).
•
•
•
• If there is no air in the refrigerant cycle [the pressure when the air conditioner is not running is higher than 1kg/cm
2
G
(0.1MPa)],discharge the refrigerant until the gauge indicates 0.5 to 1kg/cm
2
G (0.05 to 0.1MPa).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 refrigerant oil will also be discharged.
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CS-SA7CKP / CU-SA7CKP5 / CS-SC7CKP / CU-SC7CKP5
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