Evacuation Of Installation - Panasonic CS-A28BKP5 Service Manual

CS-A28BKP5/CU-A28BKP5

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.
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. Connect a charging hose with a push pin to the Low
and High sides of a charging set and the service ports
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 MPa) to -76 cmHg (-0.1 MPa). Then evacuate
the air for approximately 10 minutes.
4. Close the valve of both the Low and High sides of the
charging set and turn off the vacuum pump. Make sure
that the needle in the gauge does not move after
approximately 5 minutes.
BE SURE TO TAKE THIS PROCEDURE IN ORDER TO
AVOID REFRIGERANT GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump
and from the service port of the 3-way valve.
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. Tighten the service port caps of both the 3-way valves
at a torque of 18 N.m 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
(4 mm).
8. Mount the valve caps onto both of the 3-way valves.
• Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 cmHg (0 MPa)
to -76 cmHg (-0.1 MPa) 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.
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