How does a smart thermostat connect to a HVAC control board?
Connect the yellow wire from the Venstar device to the Y terminal on the HVAC control board. Connect the green wire from the Venstar device to the G terminal on the HVAC control board. Put the access panel back on the furnace. Turn the power for the furnace and thermostat back on at the circuit breaker.
How to find the C wire on a smart thermostat?
If there is a wire connected to the C terminal at the HVAC control board: 1 Note its color 2 Check if there are any wires tucked behind the back of the thermostat with the same color 3 If there is a matching wire, that should be your C wire.
Where does the green wire go on a thermostat?
The Green Wire The green wire underneath your thermostat connects to the fan of your furnace or air handler. It terminates at the air handler or furnace. The green wire connects to terminal G on your thermostat.
What kind of wire do I need for an AC thermostat?
18/5 wire is simply a bundle of five colored, 18 AWG wires. If you only have a heating system with no AC, you can use 18/3 wire. But, if you’re going to do the work of running new wire, might as well use 18/5 in case you install AC in the future.
Connect the yellow wire from the Venstar device to the Y terminal on the HVAC control board. Connect the green wire from the Venstar device to the G terminal on the HVAC control board. Put the access panel back on the furnace. Turn the power for the furnace and thermostat back on at the circuit breaker.
If there is a wire connected to the C terminal at the HVAC control board: 1 Note its color 2 Check if there are any wires tucked behind the back of the thermostat with the same color 3 If there is a matching wire, that should be your C wire.
What are the colors of the C thermostat wire?
These are the most common colors and the labels used for thermostat wires: 1 Blue or Black – C – The common wire 2 Red – R – 24 VAC power from the transformer in your furnace 3 Red – Rc – 24 VAC provides power to Cooling 4 Red – Rh – 24 VAC provides power to Heating 5 Green – G – Fan
18/5 wire is simply a bundle of five colored, 18 AWG wires. If you only have a heating system with no AC, you can use 18/3 wire. But, if you’re going to do the work of running new wire, might as well use 18/5 in case you install AC in the future.
