LG LB-D1861HL_CL / LB-D2461HL_CL / LB-E4881HL_CL / LB-E6081HL_CL Service Manual ▷ View online
–23–
1. Form the piping according to its routing. Avoid bend-
ing and bending back the same piping point more
than three times. (This will result in hardening the
pipe.)
than three times. (This will result in hardening the
pipe.)
2. After deforming the piping, align centers of the union
fitting of the indoor unit and the piping, and tighten
them firmly with wrenches.
them firmly with wrenches.
3. Connect pipe to the service valve or ball valve which
is located below the outdoor unit.
4. After completing the piping connection, be sure to
check if there is gas leakage in indoor and outdoor
connection.
connection.
After completing the piping connection, execute vacuum
drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out using the ser-
vice ports of both the liquid and gas side valves.
drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out using the ser-
vice ports of both the liquid and gas side valves.
Use two wrenches and tighten with regular torque.
Outdoor
unit
Liquid side
Flare connection
Flare connection
Gas side
Indoor
unit
Union
Flare nut fastening torque
Ø6.35mm
1.8kg.m
Ø9.52mm
4.0kg.m
Ø12.7mm
5.5kg.m
Ø15.88mm
6.6kg.m
Ø19.05mm
6.6kg.m
Model
Liquid side piping
Gas side piping
18K, 24K Btu/h
1/4"
5/8"
48K Btu/h
3/8"
3/4"
60K Btu/h
1/2"
3/4"
Piping Connection
Vacuum drying
CAUTION
–24–
Ceiling
CAUTION
1~3mm
Drainage hole
Drainage hole
U-Trap
B
C
A
≥
70mm
B
≥
2C
C
≥
2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10mmAq
A
A
≥
70mm
B
≥
40mm
C
≥
20mm
A
Make sure to be closed.
Unit
Drainage pipe
(Local supply)
(Local supply)
Thermal insulator
(Local supply)
Drainage hole
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
UNIT AND DRAIN PIPING
Lay the drain hose with a downware
inclination so water will drain out.
inclination so water will drain out.
Front of view
• Alway lay the drain with downward inclination
(1/50 to 1/100).
Prevent any upward flow or reverse flow in any
part.
Prevent any upward flow or reverse flow in any
part.
• 5mm or thicker formed thermal insulator shall
always be provided for the drain pipe.
1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
• The unit must be horizontal or declined to the drain hose connected when finished installation.
CORRECT
INCORRECT
• Upward routing not
allowed
Applied U-Trap Dimension
• Install the P-Trap (or U-Trap) to prevent
a water leakage caused by the blocking
of intake air filter.
of intake air filter.
INCORRECT
CORRECT
3-way Valve
1. Pumping down
• Procedure
(1) Confirm that both liquid side and gas side
valves are set to the open position.
– Remove the valve stem caps and confirm that
– Remove the valve stem caps and confirm that
the valve stems are in the raised position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(2) Operate the unit for 10 to 15 minutes.
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the 3-way valve.
– Connect the charge hose to the service port.
the 3-way valve.
– Connect the charge hose to the service port.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the liquid side valve to the closed
position.
(6) Operate the air conditioner in cooling mode
and stop it when the gaug e indicates
1kg/cm
1kg/cm
2
g.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up
– Do this quickly so that the gauge ends up
indicating 3 to 5kg/cm
2
g.
(8) Disconnect the charge set, and mount the 2-
way and 3-way valve’s stem nuts and the
service port nut.
– Use torque wrench to tighten the service port
service port nut.
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
3-Way
valve
valve
3-Way
valve
valve
CLOSE
–30–
1) Re-air purging
(Re-installation)
• Procedure
(1) Confirm that both the liquid side valve and the
gas side valve are set to the closed position.
(2) Connect the charge set and a gas cylinder to
the service port of the 3-way valve.
– Leave the valve on the gas cylinder closed.
– Leave the valve on the gas cylinder closed.
(3) Air purging.
– Open the valves on the gas cylinder and the
charge set. Purge the air by loosening the flare
nut on the liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.
nut on the liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.
– After purging the air, use a torque wrench to
tighten the flare nut on liquid side valve.
(4) Check for gas leakage.
– Check the flare connections for gas leakage.
(5) Discharge the refrigerant.
– Close the valve on the gas cylinder and
discharge the refrigerant until the gauge
indicates 3 to 5 kg/cm
indicates 3 to 5 kg/cm
2
g.
(6) Disconnect the charg e set and the gas
cylinder, and set the 2-way and 3-way valves
to the open position.
– Be sure to use a hexagonal wrench to operate
to the open position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) 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.
* CAUTION:
Do not leak the gas in the air during Air
Purging.
Purging.
Lo
Closed
OPEN
Closed
Gas cylinder
R22
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
2-Way
valve
valve
3-Way
valve
valve
–31–
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