Table 4-1. Unit Preventive Maintenance Checks and Services Quarterly Schedule (Cant.)
Not Fully Mission
Item to be
tubes and check
Fresh air inlet screen is
Remove five screws and washers
Fresh air inlet screen
from screen. Clean the wire mesh
damaged or missing.
by agitating it in detergent solution
or dry cleaning solvent (Fed Spec
P-D-680). Blow dry with
compressed air. Replace if the wire
mesh is cut or broken. Realign
wires if displaced.
Guard is broken or screen is
Inspect for damage. Replace if rods
Condenser coil guard.
torn or perforated.
are cut, broken or displaced, or if
screen is damaged. To remove,
unscrew eight screws and washers,
bottom edges. Clean by agitating in
dry cleaning solvent (Fed Spec P-
D-680). Blow dry.
Rear cover is torn, slide
Clean with detergent solution,
fastner is broken, or cover is
Inspect for tears, punctures and
damaged slide fasteners. Repair or
replace damaged cover. Lubricate
slide fastener. if necessary, with
wax stick (candle or crayon) or
Broken or deformed mesh is
Check for deformation, tears or
broken mesh. Replace if necessary.
Clean by agitating in detergent
so that bolt holes match in only one
position. Do not force or re-drill
holes to fit.
Controls are damaged or do
Connect power to air conditioner.
not operate properly.
Check controls for proper
operation. looseness or damage.
Tighten or replace as necessary.
*Service monthly or more often as required when operating in extremely dusty or sandy environments.