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E. Safety Devices
1. Compressor External or Internal Protector
If combined temperature/amperage value is above the limit specified by the compressor
manufacturer, the compressor external or internal protector operates independently to
turn off the compressor. The compressor external or internal protector de-energizes the
compressor until the temperature/amperage value returns to an acceptable level.
• If the condenser fan motor is operating and the compressor is off, it is most likely that
the compressor external or internal protector opened. If both the compressor and
condenser fan motor are off, it is most likely the appliance is off or the high-pressure
switch has opened. For further details, see "II.B. Service Diagnosis."
• On refrigerators and 1-section freezers, the compressor protector is an internal
protector. On 2-section freezers, the compressor protector is an external protector.
2. Short-Cycle Protection
There is a 2-min. minimum off-time and on-time for the compressor.
Note: Time may vary with compressor protector or high-pressure switch activation.
3. High-Pressure Switch
If pressure on the high-side of the appliance exceeds Hoshizaki specifications, the
high-pressure switch activates and interrupts the compressor circuit, de-energizing the
compressor until the pressure returns to an acceptable level.
F. Mullion/Perimeter Heater
Freezers are equipped with perimeter and mullion heaters. The heaters are energized as
soon as the power switch is turned on.
