Panasonic CS-A73KE Service Manual page 37

3 Evacuation of Re-installation
WHEN RE-INSTALLING AN AIR CONDITIONER, BE
SURE TO EVACUATE THE AIR INSIDE THE INDOOR
UNIT AND PIPES in the following procedure.
(Indoor unit)
OPEN
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 the 3-way valve.
Be sure to connect the end of the charging hose
with the push pin to the service port.
(2) Connect the center 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.
(5) Disconnect the charging hose from the vacuum
pump .
(6) Charge the pipes and indoor unit with gas refriger-
ant from 3-way valve service port, and then dis-
charge the refrigerant until low side (gas side)
gauge needle indicates 0.3 MPa (3 kg/cm
(Liquid side)
(Gas side)
Lo Hi
CLOSE
2
)
– 36 –
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.
(Outdoor unit)
2-way valve
Closed
3-way valve
Closed
(7) Tighten the service port cap at a torque of 18N•m
with a torque wrench.
(8) 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).
(9) Mount valve caps onto the 2-way and 3-way
valves.
BE SURE TO USE REFRIGERANT RECLAIM-
ING EQUIPMENT WHILE DISCHARGING THE
REFRIGERANT.
Purge the air from charge set's centre hose.
Be sure to check for gas leakage.
Caution
If gauge needle does not move from 0 MPa
(0 cmHg) to –0.1 MPa (–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.
CS-A73KE