Home Ac Thermostat Wiring

Goodman furnace thermostat wiring diagram Can't figure this 3 wire system out or find anything in postal about it Thermostat furnace wires terminals learnmetrics heat hvac w2 w1 y2 y1 goodman schemas

Can't figure this 3 wire system out or find anything in postal about it

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Can't figure this 3 wire system out or find anything in postal about it

Goodman Furnace Thermostat Wiring Diagram - 18 Goodman Ac Wiring