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TM 5-4120-287-15
Section VII. AIR CIRCULATION SYSTEM
3-31. General
a.
Operator and Organizational Maintenance Services. Operator and organizational maintenance of the air circulation
system is limited to cleaning the evaporator and condenser assemble core fins, cleaning or replacing the evaporator and
condenser section inlet air filters, and maintaining the evaporator outlet duct assembly.
b.
Evaporator Section. The evaporator blower (fan) circulation system is integral with the evaporator recirculating air
intake and conditioned air delivery ductwork. The delivery side of the blower distributes cooled, heated, or ambient
recirculating air to the shelter area as determined by the mode in which the air conditioner is operating. The total
evaporator blower discharge (delivered) air flow passes through the evaporator inlet air filter before being conditioned and
passed on to the conditioned air duct leading into the shelter.
c.
Condenser Section. The condenser circulation fan, located in the top of the condenser section, exhausts warm air
from the condenser assembly enclosure; thus drawing outdoor ambient air through the condenser inlet filter. The
condenser inlet air filter protects the condenser and subcooler assembly core fins, and various other vapor cycle
components located in the condenser section from dirt and foreign particles.
d.
Filter Clean Indicator. The filter clean indicators measure the air flow through the air filters. When air flow through
either the condenser or evaporator section is restricted sufficiently to affect air conditioning capacity the filter clean indicator
ball rises to the SERVICE pointer. When a service condition exists the effected air filter and/or core assembly must be
serviced.
3-32. Evaporator Air Inlet Filter
a.
Removal.
(1) Remove the evaporator rear access panel assembly (para. 3-27a).
(2) Remove the three air filter retaining clip hex nut fasteners (fig. 3-5); then remove the air filter retaining clips.
(3) Remove the air filter from the evaporator section air conditioner frame assembly.
b.
Cleaning, Inspection, and Replacement.
(1) Clean the air filter with an approved cleaning solvent; and dry with compressed air.
(2) Inspect the air filter for cracks, breaks, and distortion. Replace a damaged air filter.
(3) Inspect the air filter retaining clips and hex nut fasteners for serviceability. Replace defective clips.
c.
Installation.
(1) Position the air filter in the air conditioner evaporator section (fig. 3-5).
(2) Place the three air filter retaining clips in position against the air filter and tighten the three hex nut fasteners.
(3) Install the evaporator rear access panel assembly (para. 3-27).
3-33. Condenser Air Inlet Filter
a.
Removal.
(1) Roll up and tie the condenser air inlet weather cover to provide unobstructed access to the air filter.
(2) Remove the six air filter retaining clip hex nut fasteners (fig. 3-4); then remove the air filter retaining clips.
(3) Remove the air filter from the condenser section air conditioner frame assembly.
b.
Cleaning, Inspection, and Replacement.
(1) Clean the air filter with an approved cleaning solvent; and dry with compressed air.
(2) Inspect the air filter for cracks, breaks, and distortion. Replace a damaged air filter.
(3) Inspect the air filter retaining clips and hex nut fasteners for serviceability. Replace defective clips.
c.
Installation.
(1) Position the air filter in the air conditioner condenser section (fig. 3-4).
(2) Place the six air filter retaining clips in position against the air filter and tighten the six hex nut clip fasteners.
3-17
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