Pre-Heat Operation - Fujitsu Airstage V series Service Manual

Multi air conditioning system for buildings

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4-5-3 Pre-heat operation

When all compressors in the unit are turned off for 30 min. and regardless of outside temperature,

crank case heater turns ON automatically.

Crank case heater turns OFF again when any kind of outside temperature or one of compressor in the unit

starts operation.

This pre-heat operation protects the start up failure by preventing the refrigerant from soaking into the oil in compressor.