LG LSN5AP2D Bedienungsanleitung PDF herunterladen (Seite 27)

Lo Hi

Indoor unit

Outdoor unit

Manifold valve

Charge hose

Nitrogen gas

cylinder(in vertical

standing position)

Pressure

gauge

Air purging

Pressure in the system rises.

Air and moisture remaining in the refrigerant

system have undesirable effects as indicated

below.

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 non condensable

gas and moisture from the system.

Air purging with vacuum

pump

Check that each tube(both liquid and gas

side tubes) between the indoor and

o u t d o o r un i t s h a v e bee n p r o p e r l y

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.

Leak test

Connect the manifold valve(with pressure

gauges) and dry nitrogen gas cylinder to

this service port with charge hoses.

Do a leak 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.

AIR PURGING

Preparation

INSTALLATION

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.

CAUTION

Be sure to use a manifold valve for air

purging. If it is not available, use a stop valve

for this purpose. The 3-way valve must always

be kept close.

CAUTION

Pressurize the system to maximum 250

P.S.I.G.(R-22 model) or 400 P.S.I.G.

(R-410A model) with dry nitrogen gas and

close the cylinder valve when the gauge

reading reached 250 P.S.I.G. (R-22 model)

or 400 P.S.I.G. (R-410A model). Next, step

is leak test with liquid soap.

There is a risk of fire and explosion.

- Inert gas (nitrogen) should be used when you

check plumbing leaks, cleaning or repairs of

pipes etc.

If you are using combustible gases including

oxygen, product may have the risk of fires and

explosions.

CAUTION

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