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ORDER NO. MAC9807010C3
CS-MC90KH
1 Air purging
Required tools: Hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, gas leak detector, and charging
set.
joints, gas leak detector, and charging
set.
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.
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce the cooling capacity, and
could lead to a malfunction.
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.
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 of the low pressure side of
Manifold gauge counterclockwise for 10 seconds,
and then close it.
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 hexagonal wrench to
purge the air for three seconds and then wait for one
minute.
Repeat this three times or more.
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 hexagonal wrench to
release the refrigerant until the gauge indicates.
release the refrigerant until the gauge indicates.
(6) Use torque wrench CWH AD-9211 to tighten the
service port nut to a torque of 1.8kg-cm.
(7) Set the both 3-way valve 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 the
both 3-way valve’s stem nuts, and from the service port
caps.
both 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:
following procedures:
1. Re-tighten the connecting portion with torque
wrenches.
If the leakage ceases, continue the works from
step (4).
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).
Open
D
Closed
Lo
Hi
Closed
(Outdoor unit)
3-way
valve
Closed
Closed
3-way
valve
(Liquid side)
(Gas side)
(Indoor unit)
Untitled-19
6/26/00, 3:41 PM
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