TM 9-4120-388-14
4-5. 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 condi-
tioned 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 condi-
tioned area. 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.
See Figure 4-2 for installation dimensions.
(2) An unobstructed flow of air from outside the conditioned area to the inlet and outlet 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 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 volt, 3 phase, 50/60 hertz input power rated at 20.8 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 dur-
ing normal operation and that the disconnect is not used to turn off the air conditioner for normal shut-down.
(8) An earth ground capable of handling 20.8 amps.
(9) Be sure 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.
(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 Figure 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 mount-
ing holes for the condenser inlet and outlet guards, and the fresh air screen or some other arrangement may be
made. Prepare appropriate openings in an exterior wall for the ducts. Ducts may be designed to use the condens-
er inlet and outlet guards, 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.
NOTE
Easy access to fresh or return air filters must be provided. Filters may be left in position
in unit or relocated in duct work. Some installations (filters relocated in duct work) may
require different size filters.
d. Outside installation. Manufacture an arrangement of ducts for the conditioned air intake and discharge air.
Ducts may be made for attachment to the air conditioner cabinet using the mounting holes for the conditioned
air intake and discharge grilles or some other arrangement may be made. Ducts may also be made for installa-
tion of the conditioned air intake and discharge grilles on the inside ends or replacements for these items may
be used. Prepare appropriate openings in the appropriate wall for the ducts.
NOTE
Retain all items removed from unit. Store in a safe place. Parts must be reinstalled prior
to return to supply. For a list of required items, See Appendix C.
