How To Wire A 3 Wire Thermostat. When replacing a three-wire thermostat connect this wire to the R connector. In todays video we are taking a look at how easy and simple it is to install a WiFi Thermostat with or with out a C Wire.
Spyder New Member. In todays video we are taking a look at how easy and simple it is to install a WiFi Thermostat with or with out a C Wire. Red wire for power 24V.
This wire allows power to enter the unit.
This wire will go to the G terminal on your new thermostat. Our current one is a 4 wire stat and the new one is going to be a 3 wire stat. Red wire for power 24V. In a three-wire installation connect the red wire to the R terminal the white wire to the Y terminal and the blue wire to the W terminal.
