53
THE INDOOR UNIT INSTALLATION
ENGLISH
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.
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
2
G(14.2 to 7.1
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.
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.
Test operation
- If you press and hold the On/Off button for
3 – 5 seconds instead of 6 seconds, the unit
will switch to the test operation.
- In the test operation, the unit blows out
strong air for cooling for 18 minutes and then
returns to the factory default settings.
NOTE
If the actual pressure is 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.
Summary of Contents for UM36FH
Page 70: ...70 ENGLISH ...
Page 71: ......
