3-7. INSTALLATION SITE PREPARATION.
a. General . The air conditioner is designed so that it is adaptable to a variety of installation arrangements. Most
typical installations are made by preparing an opening in an exterior wall of the room or enclosure to be conditioned and
positioning the air conditioner so that the front of the cabinet is inside the room or enclosure and the back outside.
Alternate installations may be made with the entire cabinet either inside or outside the conditioned area. Refer to MIL-
HDBK-116, Environmental Control of Small Shelters, for additional general information. The following are minimum
requirements for all installations:
(1) A relatively level surface, capable of bearing the weight of the air conditioner, on which to set the base. To
insure proper condensate drainage, the surface should be level within 5 from front to back and side to side.
(2) An unobstructed flow of air from outside the conditioned area to the inlet and two outlets of the condenser
(3) An unobstructed flow of air from inside the conditioned area to the conditioned air intake and discharge.
(4) An unobstructed flow of air from outside the conditioned area to the fresh air damper intake.
(5) Access to the front and back of the cabinet for routine operation and servicing and for necessary
(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 if possible.
(7) A source of 208 VAC, 3 phase, 50/60/400 Hz input power rated at 45 amps. The power source outlet
should be located as near as possible to the installed location of the air conditioner. The power source
wiring must 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
(8) An earth ground (10 AWG minimum) capable of handling 45 amps.
(9) Check that no source of dangerous or objectionable fumes is 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.