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. 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.
(Indoor unit)
(Liquid side) 3-way valve Close
(Outdoor unit)
(Gas side)
3-way valve OPEN Close Vacuum pump
Lo Hi
OPEN
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. q 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/ cm2 (0.3 MPa).
q
q q
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.
