LG LT-B2860HL Service Manual ▷ View online
–29–
• 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.
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 pur-
chased locally.
chased locally.
■
Measure the distance between the indoor and
the outdoor unit.
the outdoor unit.
■
Cut the pipes a little longer than measured dis-
tance.
tance.
■
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.
section of pipe/tube.
■
Put the end of the copper tube/pipe to down-
ward direction as you remove burrs in order to
avoid to let burrs drop in the tubing.
ward direction 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 out-
door units, than put them on pipe/tube having
completed burr removal.
(Not possible to put them on after flaring work)
door units, 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.
shown below.
Firmly hold copper tube in a bar(or die) as indicat-
ed dimension in the table above.
ed 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.
section and do flaring work again.
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 =
Outside diameter
A
mm
inch
mm
Ø9.52
3/8
0.5~0.8
Ø15.88
5/8
0.8~1.0
–30–
1. Form the piping according to its routing. Avoid
bending and bending back the same piping point
more than three times. (This will result in hardening
the pipe.)
more 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.
tighten 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 vacu-
um 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.
um 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
Piping Connection
Vacuum drying
CAUTION
Flare nut fastening torque
Ø6.35mm
1.8kg.mm
Ø12.7mm
5.5kg.mm
Ø9.52mm
4.0kg.mm
Ø15.88mm
6.6kg.mm
Model
Liquid side piping
Gas side piping
24K, 28K BTU
Ø 9.52mm
Ø15.88mm
–34–
2. Tape the Pipings and Connecting cable from
bottom to top.
3. Form the pipings gathered by taping along the
exterior wall, and make the trap prevent water
from entering into the room.
from entering into the room.
4. Fix the pipings onto the wall by saddle or
equivalent.
In case of the Outdoor Unit being installed above
position of the Indoor Unit.
position of the Indoor Unit.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
1) PRECAUTIONS IN TEST RUN
• The initial power supply must provide at least 90% of the rated voltage.
Otherwise, the air conditioner should not be operated.
➀
For test run, carry out the cooling operation firstly even during heating season. If heating operation
is carried out firstly, it leads to the trouble of compressor. Then attention must be paid.
is carried out firstly, it leads to the trouble of compressor. Then attention must be paid.
➁
Carry out the test run more than 5 minutes without fail.
(Test run will be cancelled 18 minutes later automatically)
(Test run will be cancelled 18 minutes later automatically)
• The test run is started by pressing the room temperature checking button and down timer button for 3 sec-
onds at the same time.
• To cancel the test run, press any button.
• After completing work, be sure to measure and record trial run properties, and store measured data, etc.
• Measuring items are room temperature, outside temperature, suction temperature, blow out temperature,
• Measuring items are room temperature, outside temperature, suction temperature, blow out temperature,
wind velocity, wind volume, voltage, current, presence of abnormal vibration and noise, operating pressure,
piping temperature, compressive pressure.
piping temperature, compressive pressure.
• As to the structure and appearance, check following items.
CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE
Caution
❐
Is the circulation of air adequate?
❐
Is the draining smooth?
❐
Is the heat insulation complete
(refrigerant and drain piping)?
❐
Is there any leakage of refrigerant?
❐
Is the remote controller switch operated?
❐
Is there any faulty wiring?
❐
Are not terminal screws loosened?
M4......118N.cm{12kgf.cm} M5......196N.cm{20kgf.cm}
M6......245N.cm{25kgf.cm} M8......588N.cm{60kgf.cm}
M6......245N.cm{25kgf.cm} M8......588N.cm{60kgf.cm}
Test running
–35–
Thermometer
2) Connection of power supply
1. Connect the power supply cord to the inde-
pendent power supply.
• Circuit breaker is required.
2. Operate the unit for fifteen minutes or more.
3) Evaluation of the performance
1. Measure the temperature of the intake and dis-
charge air.
2. Ensure the difference between the intake tem-
perature and the discharge one is more than
8°C (Cooling) or reversely (Heating).
8°C (Cooling) or reversely (Heating).
CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power specialized for the air conditioner. As for the method of wiring,
be guided by the circuit diagram pasted on the inside of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from
vibrations to which the unit is subjected during the course of transportation. Check them and
make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out of the
wires.)
make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out of the
wires.)
4) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked
on the name plate.
7) Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
8) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the
normal function of a overload protection device.
• Proper starting power is not given to the compressor.
Teach the customer the operation and maintenance procedures, using the operation manual (air filter cleaning,
temperature control, etc.).
temperature control, etc.).
HAND OVER
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