Table 4-2. Unit Maintenance Troubleshooting
TEST OR INSPECTION
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
a. Test condenser fan motor relay (K7).
(See para 4-43).
b. Test condenser fan motor (B2). (See para 4-60). Contact Intermediate
Direct Support Maintenance if motor is defective.
Check to be sure there is no restriction to air flow through the condenser section.
Clean all obstructions from condenser inlet, outlets, and condenser coil.
If circuit breaker trips again soon after restart in COOL mode, do not attempt
another restart, and contact Intermediate Direct Support Maintenance for
refrigeration system troubleshooting.
5. COMPRESSOR AND CONDENSER FAN STOP DURING COOL MODE OPERATION, BUT CONDITIONED AIR
(EVAPORATOR) FAN CONTINUES TO RUN.
Check to see if high or low pressure switch is tripped.
Press then release reset button.
Wait at least two minutes before restarting in COOL mode. If either pressure
cutout switch trips soon after a restart is made, do not attempt another restart, and
contact Intermediate Direct Support Maintenance for refrigeration system