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ARMY TM 9-4120.381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 4-2. Unit Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. REDUCED HEATING CAPACITY.
Step 1. Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Check to be sure that excessive cold, outside air is not being introduced through the fresh air inlet.
Cover inlet; then, if condition improves, adjust damper as required.
Step 3. Check operation of heat control thermostat (S9).
Test thermostat (para 4-85). Replace thermostat, if defective.
WARNING
Disconnect unit power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 4. Check for loose or damaged electrical connections or damaged wires in wiring harnesses (see
Figure FO-3).
Tighten or replace lugs, or repair damaged wires.
Step 5. Check individual elements of heater (EH).
Test electric heater elements (para 4-80). Replace element(s), if defective.
Step 6. Check operation of heater contactor (K11).
Test contactor (para 4-53). Replace contactor, if defective.
6. EVAPORATOR FAN MOTOR (B1) DOES NOT OPERATE.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 1. Using wiring diagram (see Figure FO-3), check electrical connections and individual wires for tightness.
Tighten or replace electrical connectors, or repair damaged wires.
Step 2. Check operation of fan motor contactor (K8).
Test contactor (para 4-51). Replace contactor, if defective.
Step 3. Check operation of evaporator fan motor (B1).
Test motor (para 4-70). Replace motor, if defective.
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