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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:
Connective
Air
Additional amount of
pipe length
purging
refrigerant to be charged
Less than 25'
Use vacuum pump.
25'~65.6'
25'~98.4'
Use vacuum pump.
Use vacuum pump.
R410a: 1.058ozs (Pipe length-25')
(_< 12000 Btu's)
R410a: 0.705ozs (Pipe length-25')
(=18000 Btu's)
R410a: 1.0580zs (Pipe length-25')
(=21500 Btu's)
Caution in handling
the packed valve integrated in the outlets of
outdoor
unit.
1. Operation of opening packed valve: Open the valve stem until it hits against
the stopper. Do not try to open it further.
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
tightening torque table in page ] 7 for valve stem cap tightening torque
Note: There is a charging port integrated in the low side outlet, but not in the
high side outlet. The low side outlet is shown in the sketch map below.
Flarenut
Refrigerant
Valve body
Outdoor
unit
Indoor unit
A
Gasc
o
Cap
Charge port
Packed valve
Half union
Valve
Stopper
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