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Furnace Thermostat Wiring and Troubleshooting – HVAC How To
Nov 18, 2015If a thermostat is thought to be a problem then it can be bypassed with a jumper wire. Thermostats use a 24 volt transformer to control a furnace. The transformer steps down 120 volts to the 24 volts the thermostat needs, and sends out the 24 volts on two wires. The two 24 volt wires go to the R terminal and C terminal inside the thermostat.
Thermostat Wiring Explained - electrical-online
If you are replacing an old thermostat with a new digital thermostat, the electronics in these units may need yet another wire for a terminal labeled ‘C’. This terminal is for a common connection from the control transformer that will provide steady 24 volt power between terminal ‘R’ and ‘C’ to power the thermostat itself.Wiring a Light Switch · Electrical Online
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