Installation Site Preparation - TM-5-4120-393-140056

TM 5-4120-393-14

4-5. Installation Site Preparation. 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 enclosure to be

conditioned and positioning the air conditioner so that the front of the cabinet is inside the enclosure and the back outside.

Alternate installations may be made with the entire cabinet either inside or outside the conditioned area.

a. General. The following are minimum requirements for all installations.

(1) Level surface. A relatively level surface capable of bearing the weight of the air conditioner on which to set

the base. To ensure proper condensate drainage, the surface should be level within 5 from front to back and side to

side.

(2) Air flow. An unobstructed flow of air from outside the conditioned area to

(a) the inlet and outlet of the condenser;

(b) the conditioned air intake and discharge;

(3) Access, front and back. Access to the front and back of the cabinet for routine operation and servicing and

for necessary maintenance actions.

(4) Access, top. Access to the top of the cabinet for removal of the top panel and sufficient headroom to allow

maintenance and internal component removal and installation through the top panel opening.

(5) Power source. A source of 208 volt, 3 phase, 50/60 hertz input power rated at 42 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 ensure 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.

(6) Drain Trap. To ensure proper drainage of condensate water, a trapped drain line should be connected to

one or more of the drain fittings. The drain trap should have a minimum vertical trap height of 2.5 inches (6.4 cm).

(7) Ground. An earth ground capable of handling 42 amps.

(8) Fumes. Check that no source of dangerous or objectionable fumes are located near the fresh air intake.

(9) Terrain features. 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.

(10) Avoid problem areas. If possible avoid locations where the condenser and fresh air intakes will be laden

with dust, dirt, soot, smoke, and/or other debris.

b. Through the Wall Installation. Prepare an opening in the wall large enough to slide the air conditioner through.

Consideration should be given to servicing internal components. All openings around air conditioner must be sealed air

tight.

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