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Air purging with vacuum pump
1. Check that each tube(both liquid and gas side tubes) between the indoor and
outdoor units have been properly connected and all wiring for the test run has
been completed. Remove the service valve caps from both the gas and the
liquid side on the outdoor unit. Note that both the liquid and the gas side
service valves on the outdoor unit are kept closed at this stage.
2. When relocating the unit to another place, perform evacuation using vacuum
pump.
3. Pipe length and refrigerant amount:
Air
purging
Additional amount of
refrigerant to be charged
Connective
pipe length
Use vacuum pump.
Use vacuum pump.
the stopper. Do not try to open it further.
Air purging
Half union
Refrigerant
A
C
D
B
Packed valve
Gas
Indoor unitOutdoor unit
1. Operation of opening packed valve: Open the valve stem until it hits against
16.4'~32.8'
Less than 16.4'
2. Operation of closing packed valve: Securely tighten the valve stem with a special
tool. Then securely tighten the valve stem cap with a spanner or the like. Refer to
Flare nut
Stopper
Cap
Valve stem
Charge port
Valve body
Caution in handling the packed valve integrated in the outlets of
outdoor unit.
for valve stem cap tightening torque tightening torque table in page 17
high side outlet. The low side outlet is shown in the sketch map below.
Note: There is a charging port integrated in the low side outlet, but not in the
25
R410A: 0.71ozs/ft (Pipe length-16.4')