E. safety devices, F. mullion/perimeter heater, E. safety devices f. mullion/perimeter heater – Hoshizaki AMERICA 73183 User Manual

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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, the compressor external protector is integrated with the start relay.

On 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

Refrigerators and freezers with mullions are equipped with mullion heaters. Freezers are
also equipped with perimeter heaters. The heaters are energized as soon as the power
switch is turned on.

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