LG LB-H1860HL_CL / LB-H2460HL_CL / LB-G3680HL_CL Service Manual ▷ View online
–36–
2. Evacuation
(All amount of refrigerant leaked)
• Procedure
(1) Connect the vacuum pump to the center hose
of charge set center hose
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward -76 cmHg (vacuum of 4 mmHg or less).
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
– Vacuum pump oil.
If the vacuum pump oil becomes dir ty or
depleted, replenish as needed.
depleted, replenish as needed.
Lo
Open
Open
Vacuum pump
2-Way
valve
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
valve
CLOSE
OPEN
–37–
3. Gas Charging
(After Evacuation)
• Procedure
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-
– Connect the charge hose which you dis-
connected from the vacuum pump to the valve
at the bottom of the cylinder.
at the bottom of the cylinder.
– If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can
be charged with liquid.
be charged with liquid.
(2) Purge the air from the charge hose.
– Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air. (Be careful of the liquid
refrigerant). The procedure is the same if
using a gas cylinder.
purge the air. (Be careful of the liquid
refrigerant). The procedure is the same if
using a gas cylinder.
(3) Open the valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the
– If the system can not be charged with the
specified amount of refrigerant, it can be
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure
(pumping down-pin).
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure
(pumping down-pin).
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
– Stopping par tway will allow the gas to be
– Stopping par tway will allow the gas to be
discharged.
– If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.
turn off the air conditioner before disconnecting
the hose.
(5) Mount the valve stem nuts and the service
port nut.
– Use torque wrench to tighten the service port
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
\
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
Lo
Charging
cylinder
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
OPEN
Open
Check valve
(1)
Cycle
1. Installation (Connecting the piping between indoor and outdoor unit)
–38–
• Installation
(1) Connect the piping between the indoor and
outdoor unit firmly.
– Incorrect connection may cause the leakage and
– Incorrect connection may cause the leakage and
incomplete vacuuming.
(2) Attach the charging hose (manifold gage) to the
service port.
– Charging hose is necessary to check the pressure
– Charging hose is necessary to check the pressure
and to inject R22 for leakage test.
– The valve of charging hose must be closed before
being connected.
(3) Inject the 100~300g R22 through the charging hose
opening the valve.
(4) Check the joint part using a gas detector or soapy
water for leakage.
– On checking, the service valve of main service port
– On checking, the service valve of main service port
must be closed, this test is only for checking whether
pipe connection is ok or not.
pipe connection is ok or not.
(5) If there is no leakage, discharge R22 in piping
completely into tank for retrieving.
– Complete discharge is needed for vacuuming.
– If leakage is found, please fasten the joint more
– Complete discharge is needed for vacuuming.
– If leakage is found, please fasten the joint more
tightly.
(6) After closing the valve of charging hose,
disconnect the tank and connect the vacuum pump
to charging hose and open the valve again for
vacuuming.
to charging hose and open the valve again for
vacuuming.
(7) Turn on the vacuum pump until the pressure drops
below 0kg/cm
2
.
(8) After vacuuming, disconnect the vacuum pump and
open the spindle of service port (liquid-side)
slightly for 30 sec and then open the spindle of
(gas side) with hexagonal wrench.
slightly for 30 sec and then open the spindle of
(gas side) with hexagonal wrench.
(9) Open the liquid side completely first and then the
gas side fully in order.
Lo
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
Gas cylinder
R22
2. Disconnection (on moving)
• Disconnection
(1) Attach the charging hose (manifold gage) to
the service port.
– Connect the manifold gage once to the service
– Connect the manifold gage once to the service
port not stopping. Stopping in the middle of
process may cause the leakage.
process may cause the leakage.
(2) Purge the air in hose into special device such
as retrieving tank opening the valve of
charging- hose (gas side) slightly and then
close it tightly.
charging- hose (gas side) slightly and then
close it tightly.
(3) Operate the air conditioner for 10~15 min until
cycle is stabilized.
(4) Close the spindle of service port (liquid side-
high pressure) and wait till pressure of gas
side (low pressure) drops below 0kgf/cm
side (low pressure) drops below 0kgf/cm
2
.
(5) After the needle of gage indicates below
0 kgf/cm
2
, close the valve of gas side quickly
and turn off the power.
(6) Disconnect the piping between indoor and
outdoor unit and then put on service cap to
the service port.
the service port.
Lo
Outdoor unit
Indoor unit
Liquid side
Gas side
Retrieving Tank
–39–
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