Air Purging, Air purging With Vacuum Pump

Installation

AirPurging

Air and moisture remaining 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.

AirpurgingWith VacuumPump

Preparation	• Do a leak test of all joints of the tubing(both indoor
	and outdoor) and both gas and liquid side service
• Check that each tubing(both liquid and gas side	valves.
tubes) between the indoor and outdoor units have	Bubbles indicate a leak. Be sure to wipe off the soap
been properly connected and all wiring for the test	with a clean cloth.
run has been completed. Remove the service	• After the system is found to be free of leaks, relieve
valve caps from both the gas and the liquid side	the nitrogen pressure by loosening the charge hose
on the outdoor unit. Note that both the liquid and	connector at the nitrogen cylinder. When the system
the gas side service valves on the outdoor unit are	pressure is reduced to normal, disconnect the hose
kept closed at this stage.	from the cylinder.

ENGLISH

Leak test

• Connect the manifold valve(with pressure

Indoor unit

Manifold valve

gauges) and dry nitrogen gas cylinder to this

service port with charge hoses.

CAUTION

Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The "Hi" knob of

Outdoor unit

Pressure
gauge	Lo	Hi

Charge hose

the manifold valve must always be kept close.

•Pressurize the system to no more than 150 P.S.I.G. with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P.S.I.G. Next, test for leaks with liquid soap.

CAUTION

To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom when you pressurize the system.

Usually, the cylinder is used in a vertical standing position.

Nitrogen gas cylinder(in vertical standing position)

Installation Manual 27

LS122CE specifications

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