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TM 5-4120-393-14
Section III OPERATION UNDER USUAL CONDITIONS
2-6.  Assembly and Preparation for Use .  Organizational Maintenance personnel should be employed for original
unpacking, installation, and preparation for use. See paragraphs 4-2 through 4-12.
2-7. Initial Adjustments and Checks.
a. Inspect all covers, panels, grilles, and screens for loose mounting, obstructions, or shipping damage. Report any
deficiencies to organizational maintenance.
b. Perform the operator preventive maintenance checks and services listed in table 2-1.
2-8. Operating Procedure.
a. Before Operation.
(1) Check to see that the power cable has been connected to a source of 208 volt, 3 phase, 50/60 hertz power
and to the input power connector on the unit.
NOTE
When possible, power should be connected to the unit at least 30 minutes prior to
operating in the COOL mode. The compressor is equipped with a warm up heater
and thermostat that will not allow the compressor to operate prior to complete
warm up.
The unit will operate immediately (fans only) in the COOL mode. The refrigeration
system (compressor) will operate only when warm up is complete (less than 30
minutes). If additional cooling is required the fresh air damper can be opened.
When compressor reaches a safe operating temperature it will start automatically.
The fresh air damper and TEMPerature control thermostat can then be adjusted to
suit.
The compressor is also equipped with a heater that will keep it warm so long as
unit remains connected to the power source.
2-7

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