Manual Daewoo dsb 181 lh (page 13 of 31) (English)

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INSTALLATION (CONTINUED)

AIR PURGING

Air and moisture remaining in the refrigerant system may create

adverse conditions as indicated below:

• pressure in the system rises

• operating current rises

• cooling efficiency drops

• moisture in the refrigerant circuit may freeze and block capil-

lary tubing

• water may lead to corrosion of parts in the refrigerant system

Therefore, the indoor unit and tubing between the indoor and

outdoor unit must be leak tested and evacuated to remove any

noncondesables and moisture from the system.

AIR PURGING WITH VACUUM PUMP

(TEST

RUN)

Confirm each tube (narrow and wide tubes) between the indoor

and outdoor units has been properly connected and all wiring

for the test run has been completed. Remove the valve caps

from the wide and narrow service valves on the outdoor unit.

Note that both narrow and wide tube service valves on the out-

door unit are kept closed at this stage (shipping position).

Leak Test

1. With the service valves on the outdoor unit remaining closed,

remove the threaded cover on the wide tube service port.

(Save for reuse.)

2. Attach a manifold valve (with pressure gauge) and dry nitro-

gen gas cylinder to this service port with charge hoses.

CAUTION:

Be sure to use a manifold valve for air purging. If it is not avail-

able, use a stop valve for this purpose. The “Hi” knob of the

manifold valve must always be kept closed.

3. 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 reaches 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 nitrogen gas cylinder must be higher

than its bottom when you pressurize the system. Usually, the cylinder is used in a vertical standing position.

4. Do a leak test of all joints of the tubing (both indoor and outdoor) and both wide and narrow service valves. Bubbles

indicate a leak. Be sure to wipe off the soap with a clean cloth.

5. 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.

Lo Hi

Pressure

Gauge

Manifold Valve

Outdoor Unit

Indoor Unit

Charge Hose

Nitrogen Gas

Cylinder

(Vertical

Position)

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Daewoo dsb 181 lh Manual

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