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14
Copyright © 2022-2023 LG Electronics Ins.
All right reserved.Only training and service purposes.
Disassembly
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.
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 figure 18A.
2) Start the vacuum pump, slowly open manifold valves
A and B with two full turns counterclockwise
and leave the valves open .
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold
and entire system.
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 braze and braze 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.
3) Operate the vacuum pump vaccum for 20 to 30 minutes,
until 600 microns of vaccum 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 figure 18B.
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 figure 18B.
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.
NOTICE
Replacement of the refrigeration cycle.
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