TM 9-4120-357-14
CAUTION
Acetone and methyl-ethyl ketone (MEK) are flammable, and their vapors can be ex-
plosive. Use in a well ventilated area, and take precautions against fire.
(2) Replace damaged or missing seal strips by scraping off the remaining material and removing residue with
acetone or methyl-ethyl ketone and a stiff brush or wooden scraper. Apply a coating of adhesive to both mating sur-
faces. Install the new gasket material. When adhesive becomes tacky but not sticky.
(3) Replace damaged turnlock fastener receptacles by
drilling out existing rivets, replacing fastener and securing
with new rivets.
(4) Replace damaged panel fastener screws by cutting off and removing damaged screw. Insert new screw in
hole, and place retaining washer over threads and shank. Stake washer to retain on screw.
(5) Replace damaged or
missing information plate by
drilling out rivets, positioning new information plate on
panel, and securing with new rivets.
d. Installation. Install the front access panel by placing the lower lip behind the front of the base panel and pushing
panel into position. Secure by tightening four panel fastener screws.
4-21. CBR cover.
The CBR cover is located in the upper right corner of the rear surface of the air conditioner. (See figure 1-3.) it cov-
ers an auxiliary opening into one plenum of the evaporator fan. It is opened and attached to a supply of specially filtered
air when necessary to use air that is chemically-biologically-radiologically (CBR) safe.
a. Removal Remove four screws and washers from the CBR cover, and remove cover.
b. Installation. Position the CBR cover on the air conditioner. Secure with four screws and washers.
4-22. Fresh Air Filters.
The fresh air filters are located behind the two rectangular access covers on the rear surface of the air conditioner.
(See figure 1-3.) Operating efficiency of the air conditioner is directly dependent upon keeping filters clean, so that air
circulation through the evaporator coil or heating elements is not obstructed. The air conditioner should never be oper-
ated without air filters. Without them, dirt would be blown directly into the evaporator coil, and would seriously reduce the
efficiency of the unit.
a. Removal. Unscrew six panel fastener screws from each air filter cover, and remove cover. Pull the filter upward
and outward to remove.
b. Inspection. Inspect the filtering medium for displacement, punctures or other damage which would permit unfil-
tered air to pass through the filter. Inspect the frame for dents or deformation. Replace filter if damaged.
WARNING
Dry cleaning solvent, P-D-680, used to clean parts, is potentially dangerous to
personnel and property. Avoid repeated and prolonged breathing of vapors and
skin contact with the liquid. Do not use near open flame or excessive heat. Flash
point of solvent is 100 to 138 (38 to 59 ).
F
F
C
C
Compressed air used for cleaning purposes will not exceed 30 psi (2.1 kg/cm2). Do not
direct compressed air against the skin. Use goggles or full face shield.
c. Servicing. Clean filter by agitating in dry cleaning solvent (FED SPEC P-D-680). Drain, and blow dry with com-
pressed air at 25-30 psi (1.75-2.1 KG/CM 2).
4-21