Electrical Maintenance 8-27
Defrost Components
Evaporator Coil Sensor (Units with TG-VI, MT µP-IV, µP-V, µP-VI, SR-2or SR-3)
The evaporator coil sensor is mounted in the evaporator and senses the evaporator col temperature to control defrost. If the
evaporator coil temperature is below 7 C, a Defrost cycle may be initiated by the microprocessor, air switch, or manual defrost.
Internal Defrost Timer (Units with TG-VI, MT µP-IV, µP-V, µP-VI, SR-2or SR-3)
The standard factory settings are 6 hours for in-range defrost intervals and 4 hours for pull down intervals. See the appropriate
Controller Operations and Diagnostic manual for more specific information about programmable defrost intervals.
TG-VI NOTE: The in-range defrost interval is automatically determined by the controller based on the time required to
complete the previous Defrost cycle.
NOTE: The recommended defrost interval setting is 4 hours
Temperature Compensating Thermistor
The block temperature compensating thermistor is a bolt type thermistor located in a bolt hole in the rear of the engine block.
This location is one of the bolts that holds the block temperature switch in position on the engine. It is readily identified by two
wires that appear to be coming from the center of the bolt.
Temperature Compensating Thermistor
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