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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
5 10m
Liquid side: 6.35
(Pipe length-5)x30g
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 with 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 aspanner or the like.
Valve stem cap tightening torque (See Tightening torque table in previous page ).
Outdoor
unit
Indoor
unit
Refrigerant
Flare nut
Stopper
Cap
Valve body
Packed valve
Half union
Gas side
Liquid side
A
C
D
B
Valve stem
Fig.24
Fig.25
Caution in handling the packed valve
13


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