Lennox Relax series, Installation Manual

Page: 14 / 88

11 Air purging
AIR PURGING
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
Air purging
method
Additional amount of refrigerant to be charged
Less than 5m Use vacuum
pump.
___________________
5~10m Use vacuum
pump.
Liquid side:
Φ
6.35
(Pipe length-5)x30g
•
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.
Caution in handling the packed valve
•
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).