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CS-C18DKU CU-C18DKU / CS-C24DKU CU-C24DKU
11.1. Evacuation of Installation
When installing an air conditioner, be sure to evacuate the air inside the indoor unit and pipes in the following procedure.
Required tools : hexagonal wrench, adjustable wrench, torque
wrenches, wrench to hold the joints, gas leak detector, and
charging set.
Procedure:
1. Connect a charging hose with a push pin to the Low
side of a charging set and the service port of a 3-way
valve.
• Be sure to connect the end of the charging hose with the
push pin to the service port.
2. Connect the centre hose of the charging set to a
vacuum pump.
3. Turn on the power switch of the vacuum pump and
make sure that the needle in the gauge moves from 0
cmHg (0 PSI) to -76cmHg (-14.5PSI). Then evacuate the
air for approximately 10 minutes.
4. Close the valve of both the Low and High sides valve of
the charging set and turn off the vacuum pump. Make
sure that the needle in the gauge does not move after
approximately five minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID GAS LEAKAGE.
If air remain in the indoor unit and refrigeration pipes, it will
affect the compressor, reduce to cooling capacity, and could
lead to a malfunction.
5. Disconnect the charging hose from the vacuum pump
and from the service port of the 3-way valve.
6. Tighten the service port caps of both the 3-way valves
at a torque of 4.05lbf with a torque wrench.
7. Remove the valve caps of the 3-way valves. Position
both of the valves to "open" using a hexagonal wrench
(6/32 inch).
8. Mount the valve caps onto the 3-way valves.
• Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 cmHg(0 PSI)
to -76 cmHg in step (3) above, take the following
measures:
If the leaks stop when the piping connections are
tightened further, continue working from step (3).
If the leaks do not stop when the connections are
retightened, repair the location of the leak.
46
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