Evacuation Of Installation - Panasonic CS-C73KE Service Manual

CS-C73KE

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.
Vacuum pump
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 MPa (0 cmHg) to –0.1 MPa (–76 cmHg). Then
evacuate the air for approximately ten minutes.
(4) Close the Low side 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.
(Indoor unit)
(Liquid side)
(Gas side)
OPEN
Lo Hi
If air remain in the indoor unit and refrigeration
pipes, it will affect the compressor, reduce to cool-
ing capacity, and could lead to a malfunction.
2-way valve
Closed
3-way valve
Closed
CLOSE
(5) Disconnect the charging hose from the vacuum
pump and from the service port of the
3-way valve.
(6) Tighten the service port cap at a torque of
18 N•m with a torque wrench.
(7) Remove the valve caps of the 2-way valve
and the 3-way valve. Position both of the valves to
"open" using a hexagonal wrench (4 mm).
(8) Mount the valve caps onto the 2-way and 3-way
valves.
Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 cmHg 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.
– 27 –
(Outdoor unit)