11.1. Air purging
Required tools: Hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, gas leak detector, and charging
set.
1. Recheck the piping connections.
2. Open the valve of the low pressure side of Manifold
gauge counter-clockwise for 10 seconds, and then
close it.
3. Check for gas leakage.
• Check the flare connections for gas leakage.
4. Purge the air from the system.
• Open the Low pressure side valve of the manifold
gauge.
• Press the valve core pin with the hexaganol wrench to
purge the air for three seconds and then wait for one
minute.
Repeat this three times or more.
5. Balance the refrigerant in the pipings and the indoor
unit.
• Close the Low pressure side valve of the manifold
gauge.
• Press the valve core pin with the hexaganol wrench to
release the refrigerant until the gauge indicates.
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.
6. Use torque wrench CWHAD-9211 to tighten the service port
nut to a torque of 1.8 kg.cm.
7. Set both the 3-way valves to the open position.
8. Mount the valve stem nuts to the 3-way valves.
9. Check for gas leakage.
• At this time, especially check for gas leakage from both
the 3-way valve’s stem nuts, and from the service port
caps.
Caution
If gas leakage is discovered in step 3 above, take the
following procedures:
1. Re-tighten the connecting portion with torque
wrenches.
If the leakage ceases, continue the works from
step 4.
2. Locate and repair the leak. (Gas leak detector)
Repeat the works from step 1.
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:
48
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH
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