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Service Manual 29
Installation
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.
NOTICE
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.
CAUTION: Be sure to perform Pump Down procedure in the 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 in the manifold hose using the refrigerant.
3. Close the liquid side service valve(all the way).
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
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.