Air Purging Of The Piping And Indoor Unit - Panasonic CS-C7CKP Service Manual

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11.2. Air Purging of the Piping and Indoor Unit

11.2.1. Air purging (Installation)
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.
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.
Procedure:
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.
• 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.
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 in the refrigeration pipings, it will affect the
compressor, reduce the cooling capacity, and could lead to a
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.
Caution
If gas leakage is discovered in step (3) above, take
the following measures:
If the leaks stop when the piping connections are
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.
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