LG MFL39754838, Installation Manual

Page: 20 / 21

TEST RUNNING
Bolt
Tubing connection
Check that all tubing and wiring have been
properly connected.
Check that the gas and liquid side service valves
are fully open. 1.
2.
Ensure the difference between the intake
temperature and the discharge is more than 8°C
(Cooling) or reversely (Heating). 3.
A
Prepare remote control
Remove the battery cover
by pulling it according to the
arrow direction.
Insert new batteries making
sure that the (+) and (–) of
battery are installed correctly.
Reattach the cover by
pushing it back into position.
NOTE:
Use 2 AAA(1.5volt) batteries. Do not use
rechargeable batteries.
Remove the batteries from the remote control if
the system is not going to be used for a long
time.
B
Settlement of outdoor unit
Anchor the outdoor unit with a bolt and nut ø10mm)
tightly and horizontally on a concrete or rigid mount.
When installing on the wall, roof or rooftop, anchor
the mounting base securely with a nail or wire
assuming the influence of wind and earthquake.
In the case when the vibration of the unit is
conveyed to the hose, secure the unit with an
anti-vibration rubber.
C
Evaluation of the performance
Operate unit for 15~20 minutes, then check the
system refrigerant charge:
Measure the pressure of the gas side service
valve.
Measure the temperature of the intake and
discharge of air. 1.
2.
For reference; the gas side pressure of optimum
condition is as below.(Cooling) 4.
Outside ambient TEMP. The pressure of the gas side service valve
35°C(95°F)
2
4~5kg/cm G(56.8~71.0 P.S.I.G.)
NOTE:
If the actual pressure are higher than shown, the
system is most likely over-charged, and charge
should be removed. If the actual pressureare
lower than shown, the system is most likely
undercharged, and charge should be added
The air conditioner is now ready for use.
PUMP DOWN
This is performed when the unit is to be
relocated or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the
outdoor unit without loss in refrigerant gas.
CAUTION:
Be sure to perform Pump Down procedure with the
unit cooling mode.
Pump Down Procedure
Connect a low-pressure gauge mainifold hose to the
charge port on the gas side service valve.
Open the gas side service valve halfway and purge
the air from the manifold hose using the refrigerant
gas.
Close the liquid side service valve(all the way in).
Turn on the unit's operating switch and start the
cooling operation.
When the low-pressure gauge reading becomes 1
2
to 0.5kg/cm G(14.2 to 7.1 P.S.I.G.), fully close the
gas side valve stem and then quickly turn off the
unit. At that time, Pump Down has been completed
and all refrigerant gas will have been collected in
the outdoor unit.
1.
2.
3.
4.
5.
Discharge
temperature
Discharge air
Intake temperature
1.
2.
3.
INSTALLATION
20