LG LB-D1861HL_HP / LB-D1861CL_CP / LB-D2461HL_HP / LB-D2461CL_CP Service Manual ▷ View online
–29–
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"
30K Btu/h
3/8"
5/8"
36K Btu/h
3/8"
5/8"
42K Btu/h
3/8"
3/4"
48K Btu/h
3/8"
3/4"
60K Btu/h
1/2"
3/4"
Piping Connection
Vacuum drying
CAUTION
–30–
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.
700mm
(HP/CP model only)
Front of view
• Always 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
Cycle
1. Installation (Connecting the piping between indoor and outdoor unit)
–36–
• 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
–37–
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