ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
Table 4-2. Unit Maintenance Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1. AIR CONDITIONER WILL NOT START
Disconnect input power before performing internal electrical troubleshooting. Voltages used
can KILL.
Step 1.
Check to see if input power has been disconnected.
Connect input power.
Step 2.
Make sure that power is 208 volt, 3-phase, 50/60 hertz.
Connect correct input power.
Step 3.
Check to see if circuit breaker (CB1) is tripped (paragraph 4.39).
Replace circuit breaker (CB1) (paragraph 4.39).
Step 4.
Check to see if circuit breaker (CB2) is tripped (paragraph 4.39).
Replace circuit breaker (CB2) (paragraph 4.39).
Step 5.
Check operation of circuit breakers (CB1-CB2).
Test circuit breakers (paragraph 4.39). Replace circuit breaker if defective.
Step 6.
Check operation of phase relay (K6).
Test relay (paragraph 4.35) Replace relay if defective.
Step 7.
Check terminal boards (TB1 -TB2) (paragraph 4.43).
Check all terminals and internal wiring within electric box for tightness and damage. Tighten terminals. If
wires are damaged, contact Direct Support Maintenance.
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