How can I add a "C" wire to my thermostat? - Home Improvement …
Newer thermostats that offer clocks, backlit displays, WiFi, etc. are controlled using circuit boards and integrated circuits. These new circuits require a path for electricity to return to the source, and so require an extra wire. This new wire is known as the C wire, or Common wire. How do I …
hvac - Where do I connect a C wire in an old Furnace? - Home ...
2018年8月20日 · Look for the junction of the thin white wire and the two fat yellow wires -- that's where your C is. Since you have an air conditioner in this system, we can use the wiring going off to the condenser as a clue to find your C wire -- the condenser contactor/control must be connected between Y and C as the thermostat switches R to Y to call for cooling.
heating - Where to connect my “c” wire on the boiler side. Weil …
I have 18/5 wire ran already. Just need to find out where to terminate. To the “c” terminal or do i add it in somewhere else. The red wire is connectsd to my “R” on thermostat. Which is on the “G” terminal of the transformer. And the white wire is on the “w” port of the thermostat. But on the “r” terminal on the boiler relay.
Where do I connect my C wire from my thermostat when there are …
NOTE: If this diagram is accurate, the white wire to the thermostat is R, while the red wire is W. The original wire from the transformer should be connected to the R terminal on the thermostat, while the new C wire should be connected to the C terminal on the new thermostat. This should supply power to the thermostat, and allow it to operate ...
Installing c wire in older furnace - Home Improvement Stack …
2021年7月26日 · I read where you need to connect the c wire to the secondary wire on the 24v side of the transformer. There are 2 yellow wires leaving the 24v side of the transformer. 1 wire goes up the panel and connects to a white wire (top of first pic) that is going out to the ac unit outside and the other yellow wire connects to a blue wire which is ...
thermostat c wire - Home Improvement Stack Exchange
2014年8月30日 · W white wire still goes to W-OB on the new thermostat. It will have 25 Voltage across RH/RC and C wire to power the RTH9585. It's working perfectly for my three zones thermostats. Tips: use the white C wire accessory that comes with the Honeywell RTH9585WF box, insert it on the SR-503 COM terminal, and then splice it with 3 spare green wires.
Add C wire for Thermostat to Goodman furnace
2015年2月10日 · I have read most of the posts here and have a specific question about my install. In the picture you can see the 3 blue wires coming off the 24v side of the transformer. One goes to the side and than another blue wire is connected to the metal and goes to the ac unit outside. One goes up to what I believe is the exhaust fan.
Adding a C wire to a new Honeywell WIfi Thermostat
So the white wire on C goes to one side of the relay, and the red wire on Y goes to the other side. When the thermostat calls for A/C (by connecting R and Y) it completes the circuit and supplies 24V AC to the A/C relay coil (which then switches on the 240VAC main power to the compressor).
thermostat - Adding a C Wire using a 24V AC Transformer to a 2 …
2021年12月2日 · The 24v transformer supplies power to the thermostat on the R terminal and the thermostat connects the R wire to W for heat, Y for cool and G for the fan. Whats important is that if you have voltage on the R terminal, that voltage is connected to W. The smart thermostat also uses a C wire so it can power itself (R to C is 24v).
Where to install C wire? - Home Improvement Stack Exchange
2019年5月19日 · On dual transformer systems, Nest expects the common wire to come from the cool side (Nest Pro Guide, bottom of page 20); look towards your A/C not your boiler. If there is a common terminal on your A/C control board and. 18/5 wire bundle - use one of the extra wires to connect the common terminal to your Nest; 18/3 wire bundle