LG LB-D1861HL_CL / LB-D2461HL_CL / LB-F3061HL / LB-F3661HL_CL / LB-F3681HL_CL / LB-F4261HL / LB-E4881HL_CL / LB-E6081HL_CL Service Manual ▷ View online
–28–
Copper
tube
90
°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
• Preparation of Piping
6. Connecting Pipes to the Indoor Unit
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
1) Cut the pipes and the cable.
■
Use the accessory piping kit or the pipes purchased
locally.
locally.
■
Measure the distance between the indoor and the out-
door unit.
door unit.
■
Cut the pipes a little longer than measured distance.
■
Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
■
Completely remove all burrs from the cut cross section
of pipe/tube.
of pipe/tube.
■
Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Putting nut on
■
Remove flare nuts attached to indoor and outdoor units,
than put them on pipe/tube having completed burr
removal.
(Not possible to put them on after flaring work)
than put them on pipe/tube having completed burr
removal.
(Not possible to put them on after flaring work)
4) Flaring work
■
Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
dimension in the table above.
5) Check
■
Compare the flared work with figure below.
■
If flare is noted to be defective, cut off the flared section
and do flaring work again.
and do flaring work again.
Outside Diameter
" A "
Gas
Liquid
Gas
Liquid
18K BTU/h
5/8"
1/4"
0.8~1.0
0~0.5
24K BTU/h
5/8"
1/4"
0.8~1.0
0~0.5
30K BTU/h
5/8"
3/8"
0.8~1.0 0.5~0.8
36K BTU/h
5/8"
3/8"
0.8~1.0 0.5~0.8
42K BTU/h
3/4"
3/8"
1.0~1.3 0.5~0.8
48K BTU/h
3/4"
3/8"
1.0~1.3 0.5~0.8
60K BTU/h
3/4"
1/2"
1.0~1.3 0.5~0.8
Capacity
–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.
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–
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