LG 230/208V 서비스 매뉴얼 - 페이지 15

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NOTES

— Replacement of the refrigeration cycle.

1. When replacing the refrigeration cycle, be sure to

discharge the refrigerant system using a Freon

recovery System.

If there is no valve to attach the recovery system,

install one (such as a WATCO A-1) before venting

the Freon

. Leave the valve in place after

servicing the system.

2. After discharging the unit completely, remove the

desired component, and unbraze the pinch-off

tubes.

3. Solder service valves into the pinch-off tube ports,

leaving the valves open.

4. Solder the pinch-off tubes with Service valves.

5. Evacuate as follows.

1) Connect the vacuum pump, as illustrated Fig.

16A.

2) Start the vacuum pump, slowly open manifold

valves A and B with two full turns

counterclockwise and leave the valves closed.

The vacuum pump is now pulling through valves

A and B up to valve C by means of the manifold

and entire system.

CAUTION

If high vacuum equipment is used, just crack

valves A and B for a few minutes, then open

slowly with the two full turns counterclockwise.

This will keep oil from foaming and being

drawn into the vacuum pump.

3) Operate the vacuum pump for 20 to 30 minutes,

until 600 microns of vacuum is obtained. Close

valves A and B, and observe vacuum gauge for

a few minutes. A rise in pressure would

indicate a possible leak or moisture remaining in

the system. With valves A and B closed, stop

the vacuum pump.

4) Remove the hose from the vacuum pump and

place it on the charging cylinder. See Fig. 16B.

Open valve C.

Discharge the line at the manifold connection.

5) The system is now ready for final charging.

6. Recharge as follows :

1) Refrigeration cycle systems are charged from the

High-side. If the total charge cannot be put

in the High-side, the balance will be put in the

suction line through the access valve which you

installed as the system was opened.

2) Connect the charging cylinder as shown in Fig. 16B.

With valve C open, discharge the hose at the

manifold connection.

3) Open valve A and allow the proper charge to

enter the system. Valve B is still closed.

4) If more charge is required, the high-side will not

take it. Close valve A.

5) With the unit running, open valve B and add the

balance of the charge.

a. Do not add the liquid refrigerant to the Low-

side.

b. Watch the Low-side gauge; allow pressure to

rise to 30 lbs.

c. Turn off valve B and allow pressure to drop.

d. Repeat steps B and C until the balance of the

charge is in the system.

6) When satisfied the unit is operating correctly,

use the pinch-off tool with the unit still running

and clamp on to the pinch-off tube. Using a tube

cutter, cut the pinch-off tube about 2 inches from

the pinch-off tool. Use sil-fos solder and solder

pinch-off tube closed. Turn off the unit, allow it to

set for a while, and then test the leakage of the

pinch-off connection.

—15—