VENTILATION (SUPPLY AND EXHAUST FANS) -Cont

TM 55-1905-223-24-17

Table 2-2. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

VENTILATION (SUPPLY AND EXHAUST FANS) - CONT

STEP 6.

Check for loose mounting bolts or other attached hardware.

Secure bolts and hardware until snug.

STEP 7.

Motor or drive misalignment.

Check and adjust motor as required. (Refer to paragraph 2-25, 2-28, or 2-31.)

STEP 8.

Check to see if impeller is hitting housing.

Adjust impeller on shaft.

Replace impeller, shaft, or fan as required. (Refer to paragraph 2-25, 2-28, or 2-31.)

STEP 9.

Check impeller and sheaves for looseness.

Secure mounting hardware as required.

STEP 10.

Check for bent drive shaft

Replace fan shaft or motor as required. (Refer to paragraph 2-28, or 2-31.)

STEP 11.

Check to see if bearings need lubrication.

Lubricate bearings (PMCS Table 2-1).

STEP 12.

Check for worn or defective bearings.

Replace bearings as required (appropriate paragraph 2-25 thru 2-32).

Air flow too low.

STEP 1.

Check for dirty or clogged filter in air flow source.

Replace as required (paragraph 2-33 or 2-34).

STEP 2.

Check to see if dampers or registers are closed.

Open dampers or registers as required (TM 55-1905-223-10).

STEP 3.

Check to see if inlet or outlet screens are clogged or obstructed.

Clean screens or clear obstructions as required (TM 55-1905-223-10).

STEP 4.

Check for dirty or clogged coil in recirculation air source.

Clean as required (PMCS Table 2-1).

Air flow too high.

STEP 1.

Check air filters to ensure that they are in place in recirculation air source (A/C-1, 2, and 3).

Insert or adjust filters (paragraph 2-33 or 2-34).

2-20