Panasonic CS-A181KR Service Manual page 29

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)
Vacuum pump
Procedure:
(1) Connect a charging hose with a push pin to the
Low and High sides 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 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 Low side and High side 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.
(6) Charge the pipes and indoor unit with gas
refrigerant from liquid (High) side 3-way valve
service port and then discharge the refrigerant
until gas (Low) side gauge needle indicates 3 kg/
2
cm (0.3 MPa).
(Liquid side)
(Gas side)
OPEN
Lo Hi
If air remains in the indoor unit and refrigeration
pipes, it will affect the compressor, reduce to cooling
capacity, and could lead to a malfunction.
3-way valve
3-way valve
OPEN
BE SURE TO USE REFRIGERANT RECLAIMING
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 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.
(7) Tighten the service port caps of both the 3-way
valves at a torque of 18 N•m with a torque wrench.
(8) Remove the valve caps of both the 3-way valves.
Position both of the valves to "open" using a
hexagonal wrench (4 mm).
(9) Mount valve caps onto the 3-way valves.
– 28 –
CS-A181KR
(Outdoor unit)
Close
Close