Thermostat Internal Wiring Diagram

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Thermostat wiring help hvac stat contractortalk f6. If both o and b are present connect only the o wire. If both o and b are present connect only the o wire. Please use the following wiring diagram to connect thermostat mod into your car:

Furthermore, this thermostat wiring diagram is specifically for a system with two transformers. Your system likely only has one transformer, as most typical residential systems only use a single transformer for. The thermostat uses one wire to control the primary functions of your hvac system, such as heating, cooling, and fan. See the diagram below for the role of each wire in your system: As shown in the diagram, you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals. The color of wire r is usually red and c is black. C is known as the common terminal. These two connections will ensure that there is power to the thermostat that you are. Wiring diagram for nvent nuheat thermostats terminals for the floor sensor are located on the nt side of the thermostat base not illustrated.