TM9-4120-400-14
Section Ill OPERATION UNDER USUAL CONDITIONS
The Model F9000H-3SA and F9000H-1SA Air Conditioners are completely assembled, self-contained units as
received. No specific operator preparation for use is required once the unit is in place.
2-6. OPERATIONAL CHECKS.
The air conditioner should be checked for operation in all modes after installation is completed and when it is to be
placed back in operation after an extended shut down period.
Do not perform the operational check in COOL mode until input power has been supplied
to the unit for at least four hours. Liquid refrigerant tends to migrate into the compressor
crankcase and cylinders during periods when the compressor heater is not operating.
Under moderate climatic conditions, the compressor heater will normally "boil" all liquid
refrigerant out within a four hour period. If the air conditioner has been exposed to below
freezing temperatures without input power, an eight hour warm up period is
recommended.
a. Unsnap and roll up the fabric cover on the back of the cabinet. Secure it in the stowed position with the two
straps.
Figure 2-3. Fabric Cover
b. Individually adjust all louvers in conditioned air supply louver assembly to the fully open (horizontal)
position.
Figure 2-4. Fresh Air Damper and Conditioned Air Louvers