Air Purging Of The Piping And Indoor Unit - Panasonic CS-C18BKP Service Manual

11.2. Air Purging of the Piping and Indoor Unit

11.2.1. Air purging
Required tools: Hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, gas leak detector, and charging
set.
Service port cap
Be sure, using a torque wrench to tighten the service port nut (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 caps and service port caps for both
3-way valves.
3. Connect the charging cylinder to the manifold gauge as
shown above.
4. Open the valve of the low pressure side of manifold
gauge counterclockwise for 10 seconds, and then close
it.
5. Check for gas leakage.
• Check the flare connections for gas leakage.
6. Purge the air from the system.
• Open the Low pressure side valve of the manifold
gauge.
• Press the service port pin with the hexagonal wrench to
purge the air for three seconds and then wait for one
minute.
Repeat this three times or more.
7. Balance the refrigerant in the pipings and the indoor
unit.
• Close the Low pressure side valve of the manifold
gauge.
• Press the service port pin with the hexagonal wrench to
release the refrigerant until the gauge indicates 0.1 to
0.3 MPa.
CS-C18BKP CU-C18BKP5 / CS-C18BKP CU-C18BKP6 / CS-C24BKP CU-C24BKP5 / CS-C24BKP CU-C24BKP6
The air in the indoor unit and in the piping must be purged. If air
remains in the refrigeration pipes, it will affect the compressor,
reduce the cooling capacity, and could lead to a malfunction.
8. Use torque wrench to tighten the service port cap to a
torque of 18 N.m.
9. Set the both 3-way valves to the open position.
10. Mount the valve caps to the 3-way valves.
11. Check for gas leakage.
• At this time, especially check for gas leakage from the
both 3-way valve's caps, and from the service port caps.
Caution
If gas leakage is discovered in step (3) above, take
the following measures:
a. Re-tighten the connecting portion with torque
wrenches.
If the leakage ceases, continue the works from
step (4).
b. Locate and repair the leak. (Gas leak detector)
Repeat the works from step (1).
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