Section III. OPERATION UNDER USUAL CONDITIONS

TM5-4120-347-14

Section III.

OPERATION UNDER USUAL CONDITIONS

2-5. ASSEMBLY AND PREPARATION FOR USE

The Model F9000H-3 Air Conditioner is a

completely assembled, self-contained unit as received.

Unpackaging and installation may involve some

modification of the unit itself, modification of the room or

enclosure in which it is to be installed, and/or the

fabrication and installation of ducting. Such requirements are

beyond the capabilities of operators. No specific

operator preparation for use is required once the unit is in

place.

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.

b. Individually adjust all louvers in conditioned air supply louver assembly to the fully open (horizontal)

position.

c. Using the operating levers, adjust the louvers in both sections of the return air louver assembly to the

fully open position.

d. Turn the fresh air damper control to the fully closed (up) position.

e. Check that the unit is connected to the proper power source and that power has been connected to the

unit for four hours.

f. Check to see that the CONTROL CIRCUIT BREAKER and the COMPR CIRCUIT BKR are in the ON

position.

g. Turn the mode selector switch to VENTILATE, The evaporator fan should start immediately. Use a paper

streamer or smoke to check the airflow into the return air louver and out of the conditioned air supply louver.

Check the EVAPORATOR FAN SPEED switch at both the HIGH and LOW speed settings. There should be

noticeably more airflow at the HIGH speed setting.

h. To check maximum ventilation with fresh air, first turn the fresh air damper knob to fully open (down) then

adjust the louvers in both sections of the return air louver fully closed. Check the fresh air inlet located on the

lower left corner of the back of the unit using a paper streamer or smoke to be sure that air is being drawn in.

NOTE

For maximum ventilation with fresh air, it is necessary that room or enclosure air have a means of

exit through an open door or window. If the room or enclosure is tightly closed, an overpressure will

build up and decrease the volume of fresh air drawn in.

i. Fully open the return air louvers and fully close the fresh air damper.