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Two Wire Heat Only Thermostat

Thermostat Wiring Colors Code [Easy HVAC Wire Color Details]
Jul 05, 2008The red wire should always come from the hot side of the 24-volt transformer. Additionally, the common (sometimes black) should come from the common side of the transformer. Furthermore, the wire colors on the transformer will be different than the thermostat wires. If you do not know what you are doing, then please call a professional.
How to Wire a Thermostat - The Home Depot
The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. For programmable thermostats and smart thermostats, c-wires are essential for setting a schedule or having your heat or air conditioner turn on at a desired temperaturee some units can run without a c-wire, even brands like Nest recommend having one for optimal
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