LG LM-4460C2T Service Manual ▷ View online
–20–
• 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.
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
direction as you remove burrs in order to avoid to let
burrs drop in the tubing.
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 outdoor
units, than put them on pipe/tube having completed
burr removal.
(Not possible to put them on after flaring work)
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.
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 sec-
tion and do flaring work again.
tion 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
–21–
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 hard-
ening the pipe.)
more than three times. (This will result in hard-
ening 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.
outdoor 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
service ports of both the liquid and gas side valves.
vacuum drying for the connecting piping and the
indoor unit.
The vacuum drying must be carried out using the
service 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
Ø9.52mm
4.0kg.mm
Ø12.7mm
5.5kg.mm
Ø15.88mm
6.6kg.mm
Ø19.05mm
6.6kg.mm
–25–
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.
¤
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.
out firstly, it leads to the trouble of compressor. Then attention must be paid.
¤Ł
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 seconds 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, wind velocity,
• 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, com-
pressive pressure.
pressive 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
–26–
Thermometer
2) Connection of power supply
1. Connect the power supply cord to the inde-
pendent power supply.
• Circuit breaker is required.
• 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
discharge air.
2. Ensure the difference between the intake
temperature and the discharge one is more than
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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