TM9-4120-398-14
TABLE 4-2. UNIT TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
MOTOR/COMPRESSOR UNIT INOPERATIVE (OTHER COMPONENTS FUNCTIONING).
Step 1. Check for defective time-delay relay (K6.)
Replace relay. (See paragraph 4-28.)
Step 2. Check for defective motor starter (K3.)
Repair or replace motor stinter. (See paragraph 4-28.)
If problem still exists, refer to supervisor.
8.
EVAPORATOR BLOWER INOPERATIVE - VENT MODE OR AUTO MODE.
Step 1. Check for broken belt
Replace belt. (See paragraph 4-33.)
Step 2. Check for pulley loose on motor shaft or on blower shaft.
Tighten setscrew. (See paragraph 4--34.)
Step 3. Check for defective mode selector switch (S1).
Replace switch. (See paragraph 4-25.)
Step 4. Check for defective control relay (K4, K5.)
Replace relay. (See paragraph 4-28.)
Step 5. Check for defective motor starter (K1.)
Replace starter. (See paragraph 4-28.)
Step 6. Check for defective evaporator fan motor (B1.)
Replace motor. (See paragraph 4-31.)
If problem still exists, refer to supervisor.
9.
EVAPORATOR BLOWER INOPERATIVE - AUTO MODE ONLY,
Check for defective high temperature cutout switch.
Replace switch. (See paragraph 4-38.)
If problem still exists, refer to supervisor.
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