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TM 9-4120-389-14
(5) Access to the front and back of the cabinet for routine operation and servicing and for necessary
maintenance actions.
(6) Access to the top of the cabinet for removal of the top panel and sufficient headroom to allow
maintenance actions and internal component removal and installation through the top panel opening.
(7) A source of 208 VAC, three phase, 50/60 hertz input power rated at 50.0 amps. The power source
outlet should be located as near as possible to the installed location of the air conditioner. The power source
wiring should include a disconnect switch. However, provisions should be made to insure that power is not
disconnected during normal operation and that the disconnect is not used to turn off the air conditioner for
normal shut-down.
WARNING
The air conditioner must be grounded prior to operation. Connect one end of a
number 10 AWG (American Wire Gage) copper wire ground lead to an
underground metallic cold water piping system or a driven metal ground rod or
buried metal plate. Connect the other end of the ground lead to the grounding
bolt on the upper left front cover of the unit.
(8).
An earth ground capable of handling 50.0 amps.
(9).
Check that no source of dangerous or objectionable fumes are located near the fresh air intake.
(10). If possible make use of terrain features such as trees and buildings to provide a shaded location.
This will minimize the cooling load on the air conditioner.
(11). If possible avoid locations where the condenser and fresh air intakes will be laden with dust, dirt,
soot, smoke, or other debris.
b. Through the wall installation. Prepare an opening in the wall large enough to slide the air conditioner
through (See fig. 4.2). Consideration should be given to service of internal components. All openings around
air conditioner must be sealed air tight.
c. Inside installation. Manufacture an arrangement of ducts for the condenser intake and discharge air
openings, and the fresh air damper intake. Ducts may be made for attachment to the air conditioner cabinet
using the mounting holes for the condenser inlet guard and outlet louvers, and the fresh air screen. Prepare
appropriate openings in an exterior wall for the ducts. Ducts may be designed to use the condenser inlet guard
and outlet louvers, and the fresh air screen supplied with the air conditioner and relocated and installed on the
new duct work. Adequate replacements or some other arrangement of these items may be provided.
4-7
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