Pump Down - LG LS-J0910CL Service Manual

(7) Test running
1. Check that all tubing and wiring have been properly
connected.
2. Check that the gas and liquid side service valves are
fully open.
1. 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 sys-
tem is not going to be used for a long time.
2. Settlement of outdoor unit
Anchor the outdoor unit with a bolt and
nut(ø10mm:0.39") 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.
Bolt
Tubing connection
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3. Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge of air.
3. Ensure the difference between the intake temperature
and the discharge is more than 8°C(46˚F) (Cooling) or
reversely (Heating).
4. For reference; the gas side pressure of optimum condi-
tion is as below. (Cooling)
Discharge air
Outside ambient TEMP.
35°C(95°F)
NOTE:
• If the actual pressure are higher than shown, the system
is most likely over-charged, and charge should be
removed. If the actual pressure are 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
1. Connect a low-pressure gauge manifold hose to the charge port
on the gas side service valve.
2. Open the gas side service valve halfway and purge the air from
the manifold hose using the refrigerant gas.
3. Close the liquid side service valve(all the way in).
4. Turn on the unit's operating switch and start the cooling operation.
5. When the low-pressure gauge reading becomes 1 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.
Intake temperature
Discharge
temperature
The pressure of the gas side
service valve
4.5~5.5kg/cm 2 G
(63.9~78.1 P.S.I.G.)
2