Friedrich M09YJ Manuel D'installation page 24

24
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 under-
charged, and charge should be added.
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 refrig-
erant.
CAUTION
!
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 0.5kg/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.