Panasonic CS-SA9CKP Service Manual page 41

9.1. Air purging (Installation)
Required tools:
hexagonal wrench, adjustable wrench, torque wrench,
wrench to hold 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 are gas leaks, a gas cylinder and the
charge set will be needed.
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 refrigerant cycle.
Procedure:
1. Recheck the piping connection.
2. Open the valve stem of the 2-way valve counter-clockwise,
wait 10 seconds and then set it to close position
• • • • Be sure to use a hexagonal wrench to operate the valve
stem.
3. Check for gas leakage.
• • • • Check the flare connections 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 hexagonal wrench to press the valve core pin,
discharge for 3 seconds and then wait for 1 minute
Repeat this for 3 times.
5. Use torque wrench to tighten the service port cap to a
torque of 1.8kg.m (18N.m)
6. Set the 3-way valve to the opened position.
The air in the indoor unit and in the piping must be purged.
If air remains in the refrigeration pipings, it will affect the
compressor, reduce the cooling capacity and could lead to
a malfunction.
7. Mount the valve's stem nuts to the 3-way and 3-way valve.
8. Check for gas leakage
• • • • At this time, especially check for the leakage from the 2-
way and 3-way valve´s stem nuts, and from the service
port cap.
If gas leakage is found in step (3) above, take the following
measure.
1. If the gas leaks stop when the piping connections are tighten
further, continue working from step (4).
2. If gas leaks does not stop when the connections are
retighten, 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.
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CS-SA9CKP CU-SA9CKP5 / CS-SA12CKP CU-SA12CKP5
Caution