Lennox XC25 – Emergency 24VAC System Operation

The Y terminal located on the outdoor control allows the outdoor unit to be cycled ON and OFF using 24VAC inputs. The outdoor unit will operate at 100% capacity in this configuration.

The following wiring diagrams display the wiring changes needed to switch a full communicating system to a non-communic­ating system with the XC25 running in emergency mode (24VAC inputs to outdoor unit).


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