TM 9-4120-357-14
Section VIII. MAINTENANCE OF COVERS, GRILLES AND FILTERS
4-15. General.
This section covers the evaporator intake and discharge louvers, air filters, mist eliminator, condenser fan inlet and
discharge grilles, fresh air intake, and condenser cover. These parts must be serviced regularly or removed frequently to
gain access to other parts of the air conditioner.
4-16. Air Conditioner Cover.
The fabric air conditioner fan cover protects the condenser fan and internal refrigeration components from severe
weather when the air conditioner is used only for heating or ventilating. When not in use, the cover is rolled up and held
in place by fabric straps which are retained by turn button fasteners. In use, the cover is closed on the bottom and two
sides with a zipper.
a. Removal Remove the air conditioner cover from the air conditioner by removing 12 screws and washers from the
edges, and two turn button fasteners from the top of the cover. Carefully work the cover off the mounting flange.
b. Installation. Work the cover over the mounting flange until eyelets are aligned with threaded holes in the
mounting flange. Secure with 12 screws and washers and two turn button fasteners, finger tight. Check operation of the
zipper and retaining tapes, and adjust as required. Tighten screws.
4-17. Top Panel Assembly.
The top panel encloses the top of the air conditioner, and provides access to the mist eliminator, heating elements
and evaporator blower. The inside surface of the panel is fitted with sealing strips along the sides and around the air in-
take plenums, and the remainder of the area is insulated to minimize noise and heat transfer.
a. Removal Remove 16 screws and washers from the frame of the evaporator discharge louver. Remove the lou-
ver. Remove 22 screws and washers from the top, and nine screws and washers from the rear flange of the top panel.
Lift the panel off the casing.
b. Inspection. Inspect the panel for dents, holes or deformation. Inspect sealing strips for tears and missing
pieces, and check insulation for completeness and adherence.
CAUTION
Acetone and methyl-ethyl ketone (MEK) are flammable and their vapors can be explo-
sive. Use in a well ventilated space, and take precautions against fire.
c. Repair. Straighten deformation and patch holes in the panel, using standard sheet-metal repair methods. Re-
place damaged sealing strips and insulation as required, by scraping damaged material from inside of panel, and clean-
ing out residue with acetone or methyl-ethyl ketone and a stiff brush or wooden scraper. Apply adhesive to panel and
mating surface of sealing strip or insulation. When tacky, install carefully.
d. Installation. Position the top panel on the air conditioner, and press down until seated. Install 22 screws and
washers in top of panel, and nine screws and washers in rear flange. Position the air discharge grille on the front of the
front of the air conditioner. Secure it with 16 screws and washers through edges of the frame.
4-18. Air Discharge Grille.
The air discharge grille is located at the top front of the air conditioner. Each side of the grille is independently ad-
justable for controlling the direction of the discharged air.
a. Removal. Remove 16 screws and washers from the frame of the grille. Remove the grille.
b. Inspection. Inspect the grille for bent blades and missing or damaged gasket material. Check operation of the
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