LG UM30F Installation Manual page 52

THE INDOOR UNIT INSTALLATION
52
Pump Down
This is performed when the unit is relocated
or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant into
the outdoor unit without the loss of refrigerant.
NOTE
Be sure to perform Pump Down procedure
in the cooling mode.
WARNING
!
It may cause explosion or injury.
After pump down, power must be turned
off before removing the pipe. When
operating this product without connecting
the pipe, there will be high pressure inside
the compressor due to the entry of air,
possibly causing explosion or injury.
Pump Down Procedure
- Connect a low-pressure gauge manifold
hose to the charge port on the gas side
service valve.
- Open the gas side service valve halfway and
purge the air in the manifold hose using the
refrigerant.
- Close the liquid side service valve(all the
way).
- Turn on the unit's operating switch and start
the cooling operation.
- When the low-pressure gauge reading
becomes 1 to 0.5 kg/cm
P.S.I.G.), fully close the gas side valve and
then quickly turn off the unit. Now Pump
Down procedure is completed, and all
refrigerant is collected into the outdoor unit.
2
G(14.2 to 7.1