TM 9-4120-408-14
5-7. CONDENSER VANE AXIAL FAN MAINTENANCE. (Continued)
WARNING
Do not work on equipment with power connected. Electrocution hazard is present. Failure to
obey this warning may result in death or serious personal injury.
(1) Refer to wiring diagram H-2 and tag and disconnect condenser vane axial fan electrical leads and remove
and discard wire ties.
NOTE
Steps 2 and 3 apply to both condenser vane axial fans.
(2)
Remove nut (Figure 5-2, 1), lock washer (2), flat washer (3), cable clamp (4), screw (5), and wiring
harness (6) from condenser vane axial fan (7). Discard lock washer (2).
(3)
Remove seven nuts (8), lock washers (9), flat washers (10), screws (11) and condenser vane axial fan
(12) from condenser top panel (13). Discard lock washers (9).
b. Test.
CAUTION
Electrical lead mounted on terminal board, TB1, is negative. Failure to properly hookup
power supply may result in damage to equipment.
(1) Apply 28vdc to individual condenser vane axial fan assemblies (7 and 12). Condenser vane axial fans (7
and 12) should begin spinning immediately and quietly with no vibration, loud humming, wobbling or
overheating.
(2)
Check for voltage drop below 24vdc.
(3)
Replace condenser vane axial fan (7 or 12) if it does not spin, vibrates, hums loudly, wobbles, or
overheats.
c. Repair.
(1)
Inspect wiring harness on condenser vane axial fans (7 and 12) for burns or damage. Refer to Appendix
(2)
Check blades and housings of condenser vane axial fans (7 and 12) for cracks, bends, or breaks. Ensure
housings do not touch blades and that blades spin freely.
(3)
Inspect condenser top panel (13) for cracks, bends, holes, or damage.
(4)
Inspect all mounting hardware for damage.
(5)
Replace all damaged or defective components.
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