Part 2 Functions & Controls
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Only for training and service purposes
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4.8 Preheat
• This is operation to preheat the compressor by conducting current through motor coils of the compressor for preventing
phenomena that liquid refrigerants are income due to difference between temperature of the outside pipe and tempera-
ture of the compressor as outdoor temperature becomes low.
• Enter preheat operation of the compressor if meeting , , conditions as below at the same time.
where outdoor temperature is less than 5°C
where discharge temperature of the compressor is more than 15°C
where the compressor turns off
• Release preheat operation if meeting one or more of , , conditions.
where outdoor temperature is more than 5°C
where diacharge temperature of the compressor is more than 25°C
where the compressor turns on
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