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Air and moisture in the refrigerant system have
undesirable effects as indicated below:
Pressure in the system rises.
Operating current rises.
Cooling or heating efficiency drops.
Moisture in the refrigerant circuit may freeze
and block capillary tubing.
Water may lead to corrosion of parts in the
refrigeration system.
Therefore, the indoor unit and tubing between
the indoor and outdoor unit must be leak tested
and evacuated to remove any noncondensables
and moisture from the system.
Air purging with vacuum pump
Preparation
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.
Pipe length and refrigerant amount:
Connective
pipe length
Less than 5m
More than 5m Liquid side: 6.35
(Pipe length-5M)x15g
Air purging
method
Use vacuum
pump.
Use vacuum
pump.
Additional amount of
refrigerant to be charged
AIR PURGING
Air purging
12
When relocate the unit to another place,
perform evacuation using vacuum pump.
Make sure the refrigerant added into the air
conditioner is liquid form in any case (Not
applicable to the units adopt freon R22 )
Open the valve stem until it hits against the
stopper. Do not try to open it further.
Securely tighten the valve stem cap with a
spanner or the like.
Valve stem cap tightening torque
(See Tightening torque table in previous page ).
Caution in handling the packed valve
Outdoor
unit
Indoor
unit
Refrigerant
Packed valve
Half union
Gas side
Liquid side
AC
D
B
Fig.24
Flare nut
Stopper
Cap
Valve body
Valve stem
Fig.25
13


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