TM 9-4120-407-14
2-7. OPERATING PROCEDURES. (Cont)
(b) Wait one minute then set circuit breaker (CB1) to the ON position.
Figure 2-7. Circuit Breaker CB1
(c) Turn the MODE selector rotary switch to the desired operating position.
(d) If the circuit breaker continues to trip, immediately shutdown the air conditioner and
disconnect power. Notify Unit Maintenance.
(2) If the motor controller draws excessively high amperage, the OVER CURRENT FAULT indicator
light will come on and the air conditioner will shutdown.
(a) Turn the MODE selector rotary switch to OFF/RESET position.
(b) Turn the MODE selector rotary switch to the desired operating position.
(c) If the OVER CURRENT FAULT indicator light continues to come on, immediately shutdown
the air conditioner and disconnect power. Notify supervisor.
(3) If the motor controller is supplied with excessively high or low voltage, the OVER/UNDER
VOLTAGE FAULT indicator light will come on and the air conditioner will shutdown.
(a) Turn the MODE selector rotary switch to OFF/RESET position.
(b) Turn the MODE selector rotary switch to the desired operating position.
(c) If the OVER/UNDER VOLTAGE FAULT indicator light continues to come on, immediately
shutdown the air conditioner and disconnect power. Notify supervisor.
(4) If the motor controller is exposed to excessively high temperatures, the HOT MOTOR
CONTROLLER FAULT indicator light will come on and the air conditioner will shutdown.
(a) Turn the MODE selector rotary switch to OFF RESET position.
(b) Turn the MODE selector rotary switch to the desired operating position.
(c) If the HOT MOTOR CONTROLLER FAULT indicator light continues to come on, immediately
shutdown the air conditioner and disconnect power. Notify supervisor.
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