TM9-4120-388-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
Step 1. Check to see if input power has been disconnected.
Connect input power.
Step 2. Be sure that power is 208 volt, 3 phase, 50/60 hertz.
Connect correct input power.
Step 3. Be sure to see if compressor circuit breaker is tripped.
Slowly PULL out AND PUSH in reset knob TO RESET Circuit Breaker.
Step 4. Check for loose or damaged electrical connectors or damaged wires in wiring harnesses. (See para 4-43.)
Tighten or replace connectors, or repair damaged wires.
Step 5. Check fuses. (See para 4-52.)
Replace bad fuse(s).
Step 6. Check operation of the auxiliary switch in circuit breaker (CB1).
Test (CB1) auxiliary switch. (See para 4-51.) Replace circuit breaker if auxiliary switch is defective.
Step 7. Check operation of control power transformer (T1).
Test Transformer. Replace transformer, if defective (See para 4-50).
Step 8. Check operation of RFI Filter (FLI) and d.c. rectifier (CR1) assembly.
Test filter and rectifier. (See para 4-44 and 4-53.) Replace defective filter or rectifier.
Step 9. Check all terminals and internal wiring within junction box for tightness and damage.
Tighten terminals, or repair wiring as necessary. (See para 4-49.)
4-32
