Table 4-2. MODEL F10000R-6 TROUBLESHOOTING

TM 5-4110-234-14

TO 40R7-5-7-1

Table 4-2. MODEL F10000R-6 TROUBLESHOOTING (cont.)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Tighten all loose connections.

Step 8.

Check continuity of fuses F2, F3 and F4.

Replace bad fuses. See paragraph 4-38.

Step 9.

Check for defective compressor.

Report to direct support maintenance.

2. INSUFFICIENT COOLING

Step 1.

Check for closed receiver valves.

Open receiver valves.

Step 2.

Check evaporator air intake and outlet screens to make sure they are not obstructed.

Remove obstruction.

Step 3.

Test evaporator fan for defects. See paragraph 4-41.

Replace defective fan.

Step 4.

Check evaporator and condenser coil for dirt or any obstruction that would block air flow.

Clean coils.

Step 5.

Check thermostat for defects.

Replace defective thermostat.

Step 6.

With unit operating in cooling cycle check the refrigerant sight glass.

If center indicator is pink or if numerous bubbles appear contact direct support

maintenance.

Step 7.

Check for clogged filter-drier. Feel filter-drier for temperature difference. Discharge end will either

feel cooler than input end if clogged, or may be sweaty or frosty.

Report to direct support maintenance.

Step 8.

Check whether compressor is operating. Report problems to direct support maintenance.

3. EXCESSIVELY NOISY OPERATION

Step 1.

Check for low oil level in compressor. Oil not visible in compressor crankcase sight glass.

Report to direct support maintenance.

Step 2.

Check for defective compressor.

Report to direct support maintenance.

Step 3.

Check evaporator fan for looseness, vibration or interference. See paragraph 4-41.

Tighten setscrews. Look for bent or broken blades that would cause an out-of-balance

condition. Replace defective fan as necessary.

Step 4.

Check condenser fan for looseness, vibration or interference. See paragraph 4-42.

Tighten setscrews. Look for bent or broken blades that would cause an out-of-balance

condition. Replace defective fan as necessary.

Step 5.

Check if drive belt is loose or broken.

Adjust or replace (para 4-43).

Step 6.

Check for loose mounting hardware.

Tighten as needed.

4. EVAPORATOR AIR OUTPUT VOLUME INSUFFICIENT

Step 1.

Inspect screen for dirt and clogging.

Clean or replace screen (para 4-18).

4-22