Basic Hvac Electric Wiring

Can't figure this 3 wire system out or find anything in postal about it Thermostat honeywell terminals schematic trane ecobee Hvac wiring explained

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

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[diagram] electric heat pump wiring diagram full version hd quality .

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Hvac Wiring Explained

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

[DIAGRAM] Electric Heat Pump Wiring Diagram FULL Version HD Quality