LG LP-K3063ZA Service Manual ▷ View online
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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.
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 down room temperature checking button and ON/OFF button for 3 sec-
onds at the same time.
• To cancel the test run, press ON/OFF 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, wind volume, voltage, current, presence of abnormal vibration and noise, operating pressure, piping
temperature, compressive pressure.
temperature, compressive pressure.
• As to the structure and appearance, check following items.
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).
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
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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
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
– 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
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1) Re-airpurging
(Re-installation)
• Procedure
(1) Confirm that both the liquid side valve and the
gas side valve are set to the closed position.
(2) Connect the charge set and a gas cylinder to
the service port of the 3-way valve.
– Leave the valve on the gas cylinder closed.
– Leave the valve on the gas cylinder closed.
(3) Air purging.
– Open the valves on the gas cylinder and the
charge set. Purge the air by loosening the flare
nut on the liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.
nut on the liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.
– After purging the air, use a torque wrench to
tighten the flare nut on liquid side valve.
(4) Check for gas leakage.
– Check the flare connections for gas leakage.
(5) Discharge the refrigerant.
– Close the valve on the gas cylinder and
discharge the refrigerant until the gauge
indicates 3 to 5 kg/cm
indicates 3 to 5 kg/cm
2
g.
(6) Disconnect the charg e set and the gas
cylinder, and set the 2-way and 3-way valves
to the open position.
– Be sure to use a hexagonal wrench to operate
to the open position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) Mount the valve stem nuts and the service
port nut.
– Use torque wrench to tighten the service port
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage.
* CAUTION:
Do not leak the gas in the air during Air
Purging.
Purging.
Lo
Closed
OPEN
Closed
Gas cylinder
R22
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
3-Way
valve
valve
3-Way
valve
valve
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