What all those letters mean on your thermostat’s wiring 2 wire thermostat wiring diagram Thermostat wiring diagram mean letters wire 2wire only where ifixit thermostats which goes
2 wire thermostat wiring diagram - Wiring Diagram
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2 wire thermostat wiring diagram - Wiring Diagram
What All Those Letters Mean on Your Thermostat’s Wiring - iFixit