LG LB-F3680HL / LB-F3680CL Service Manual ▷ View online
–22–
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
Model
Liquid side piping
Gas side piping
36K BTU
Ø 9.52mm
Ø15.88mm
Flare nut fastening torque
Ø6.35mm
1.8kg.mm
Ø12.7mm
5.5kg.mm
Ø9.52mm
4.0kg.mm
Ø15.88mm
6.6kg.mm
1. Wrap the connecting portion of indoor unit with
the Insulation material and secure it with two
Plastic Bands. (for the right pipings)
Plastic Bands. (for the right pipings)
• If you want to connect an additional drain hose,
the end of the drain-outlet should keep distance
from the ground. (Do not dip it into water, and fix
it on the wall to avoid swinging in the wind.)
from the ground. (Do not dip it into water, and fix
it on the wall to avoid swinging in the wind.)
2. Tape the Pipings, drain hose and Connecting
Cable from bottom to top.
3. Form the pipings gathered by taping along the
exterior wall and fix it onto the wall by saddle
or equivalent.
or equivalent.
–25–
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.
is carried 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 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}
Test running
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap is required to prevent water from entering
into electrical parts.
into electrical parts.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Drain hose
Taping
Pipings
Connecting
cable
cable
Power supply
cord
cord
In case of the Outdoor unit being installed
below position of the Indoor unit.
below position of the Indoor unit.
FORM THE PIPINGS
–26–
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
2) Connection of power supply
1. Connect the power supply cord to the independent 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 discharge air.
2. Ensure the difference between the intake temperature and the discharge one is more than 8°C (Cooling) or
reversely (Heating).
3-way Valve
1. Pump 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
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 gauge 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
–27–
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