LG MU2R17.UL0 User Manual download pdf (Page 28)

28

AIR PURGING AND EVACUATION

ENGLISH

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. Check that

both the liquid and the gas side service valves

on the outdoor unit are kept closed at this

stage.

Connect the manifold valve(with pressure

gauges) and dry nitrogen gas cylinder to this

service port with charge hoses.

CAUTION

Be sure to use a manifold valve for leakage

test. If it is not available, use a stop valve for

this purpose. The "Hi" knob of the manifold

valve must always be kept close.

- Pressurize the system to no more than

551 P.S.I.G. with dry nitrogen gas and

close the cylinder valve when the gauge

reading reached 551 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.

!

- Do a leakage test of all joints of the

tubing(both indoor and outdoor) and both gas

and liquid side service valves.

Bubbles indicate a leak. Be sure to wipe off

the soap with a clean cloth.

- After the system is found to be free of leaks,

relieve the nitrogen pressure by loosening

the charge hose connector at the nitrogen

cylinder. When the system pressure is

reduced to normal, disconnect the hose from

the cylinder.

The air and moisture remaining in the refriger-

ant system have undesirable effects as indi-

cated 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, after evacuating the system, take a

leak test for the piping and tubing between

the indoor and outdoor unit.

Checking method

Charge hose

Nitrogen gas

cylinder(in vertical

standing position)

Indoor unit

Outdoor unit

Lo Hi

Manifold valve

Pressure

gauge

Preparation

Leakage test

AIR PURGING AND EVACUATION

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