TM 9-4120-357-14
(7) Treating Mildewed Areas. Canvas that has mildewed can be cleaned by scrubbing with a dry brush. If it is
necessary to use water to remove dirt, it should not be used until mildew has been removed. After removing mildew,
examine fabric. Look for evidence of deterioration. If canvas has deteriorated, it should be replaced.
NOTE
If the equipment must be kept in continuous operation,
check and service only those items that can be checked and
serviced without disturbing operation. Make the complete
checks and services when the equipment can be shut down.
Table 2-2. Operator/Crew Preventive Maintenance Checks and Services
Item
Interval
Item To Be
Procedure
Not Fully Mission Capable
No
Checked Or
If:
Serviced
1
Before
Grilles
Check all grilles for obstructed
Grilles are damaged.
openings or damage.
Sight-glass broken or indi-
2
During
Sight-glass liquid
Wait at least 15 mins. after start
cates low refrigerant level
up. indicator Check sight-glass for
or moisture
damage, bubbles, milkiness or yel-
low color.
3
After
Air filters
Check for obstructions, dirt or dam-
age
.
4
After
Operating controls
Check control knobs for security
Control knobs missing or
and damage.
damaged.
5
Weekly
Air filters
Check for obstructions, dirt or dam-
age.
6
Weekly
Operating controls
Check control knobs for security
Control knobs missing or damaged.
and damage
.
7
Weekly
Fresh air damper
Check freedom of operation.
8
Monthly
Air conditioner
Check cover for tears, punctures or
cover
damaged fasteners
Section III. OPERATION UNDER USUAL CONDITIONS
2-10. Set-up and Preparation For Use.
a
Location. The air conditioner is designed to have the entire rear surface exposed to the outside of the building.
An unobstructed flow of air is necessary to permit efficient operation of the unit and to supply make-up air for ventilation
of the interior space. A shaded location should be chosen whenever possible, to minimize the cooling load on the refrig-
eration system.
b. Electrical service. The air conditioner requires electric power of 208 volts, 50/60 hertz, 3-phase AC. The main
power input receptacle is located on the lower part of the left side of the unit. However, if this location is not convenient,
alternate locations exist on the rear and right-hand panels, and in the block-off plate (Figure 4-8), which replaces the
control panel assembly when it is remotely located. The power input receptacle can be transferred to any of these loca-
tions by removing four (each) screws and nuts from both the receptacle and the cover plate at the new location. The
cover plate should always be installed in the location from which the receptacle was removed, to prevent bypass-leakage
of condensing air. The air conditioner must be grounded by connecting the grounding stud (Figure 1-3), on the rear side
motor mount bracket to a copper rod driven at least 18 inches into the earth.
2-7