DEFROSTING
MEDIUM TEMP
GENERAL
Periodic defrosting to keep the coil free of frost is accomplished automatically by a time clock. Medium temperature cases generally
operate at temperatures that allow for off-cycle defrost. Medium temperature cases that operated at colder temperatures for fresh meat
products may use electric or hot gas defrost.
DEFROST SETTINGS AND CONTROLS
Off-Cycle Defrost
Frequency: Two off-cycle defrosts per day are recommended.
Duration: Generally defrost is terminated on time with the recommended setting of 30 minutes. If temperature termination is selected, the
termination temperature is set for 45°F for discharge air and coil temperature. Stocking or shopping activities during defrost may result in
premature defrost termination.
ELECTRIC AND HOT GAS DEFROST
Follow the setting recommendations found in the Defrosting Low Temp section.
DEFROST OPERATION
Off-Cycle
For off-cycle defrost, refrigeration to the unit is stopped either by stopping the compressor or closing the liquid line solenoid valve and
allowing the compressor to pump down. During an off-cycle defrost, the fans, lights, and anti-sweat heaters remain on.
Electric and Hot Gas
For a description of these defrost types see the Defrosting Low Temp section.
44 • Defrosting - Medium Temp
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