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Evacuation and Refrigerant Charge
4. Evacuation and Refrigerant Charge
Tools and Instruments
Vacuum Pump, High Pressure Compound Gauge, Low Pressure Compound Gauge, Refrigerant Cylinder with
Sufficient R410A Refrigerant, Weighing Scale, Charging Hoses (Lead Pipes), Other General Piping Tools and
Ratchet Wrenches.
Preparation
Confirm the required amount of refrigerant, referring to the piping instruction label. Arrange piping connection work
for evacuation and refrigerant charging as shown in Figure below.
4.1 Evacuation Procedures
(1) Fully close the stop valves of the indoor unit, and release the backseat position of the liquid inlet valve.
(1) Operate the vacuum pump and ensure that the refrigeration cycle is being evacuated (V1:open, V2:closed).
(2) Continue
the
vacuum
approximately-756mmHg.
(3) Stop the vacuum pump, wait for approximately 5 minutes and confirm the vacuum pressure has not increased.
(4) Close the vacuum pump connection line (V1, V2:closed).
4.2 Refrigerant Charge
(1) Purge air from the refrigerant cylinder connection line (V1,V2:closed).
(2) Charge liquid refrigerant gas as required into the refrigeration cycle by weighing the refrigerant cylinder (V1:
closed, V2:open).
(3) Close the charging line (V1, V2:closed).
(4) After all evacuation and charging work, backseat the stop valves of the indoor unit and tighten the packing
glands and the cap nuts.
Notes：
(1) A gauge manifold or equivalent piping connected with a vacuum pump and a refrigerant cylinder is
recommended for rapid evacuation and charging work.
(2) When charging by weight is stopped due to high ambient temperature or piping arrangements, charge the gas
refrigerant from the low pressure check joint while operation the entire system at the stage of initial start-up.
Indoor Unit
pump
operation
until
Evacuation and Refrigerant Charge
- 16 -
Evacuation and Refrigerant Charge
the
pressure
indication
Outdoor Unit
of
the
gauge
shows
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