Lennox XC25 – Compressor Operation, Checkout and Status / Error Codes

The compressor is a 380VAC three-phase variable-capacity scroll compressor that is approved for use with HFC­410A refri­gerant. The compressor, when connected to an inverter, is capable of operating in a running frequency range from 22 hertz up to a maximum of 70 Hertz (maximum hertz is dependent on compressor size). The compressor speed is determined by demand from the room thermostat.


When the compressor is running, the 7­segment display on the outdoor control sends the current compressor demand (as a percentage) to the room thermostat. (Example: C 5 0 – compressor is running at 50% of maximum speed.)



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