how to wire a thermostat to a furnace

This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).

How do you hook up a thermostat to a furnace blower?

Locate the “G” terminal, which controls the blower operation from the thermostat, on the board. Connect the green low voltage wire to the “G” terminal and put the access panel back on the front of the furnace. If no green wire exists you may need to pull a new thermostat wire from the furnace to the thermostat.

What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

How many wires does a thermostat need?

The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire. That’s why we only need two wires: Red wire for power (24h).

Where does blue wire go on furnace?

The Blue or “C” Wire

C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Blue wires are for heat pumps, like orange wires. This wire connects to terminal B on your thermostat.

Can I use any thermostat for heat only?

Note: To regulate a single-stage heating system, you can actually use any thermostat that supports single stage wiring. For example, Smart thermostats like Nest, Ecobee, and WiFi thermostats like Honeywell RTH9585WF, Emerson Sensi – all support single stage wiring.

What is a 2 wire thermostat?

October 8, 2021. If we put it simply, a 2 wire thermostat is one that has only 2 wires coming out of its backside. As you already know, there are different types of thermostats serving different types of heating/cooling systems.

Do I need a jumper from R to RC?

If you just have one wire, regardless if it’s labeled RC, it will go into the R terminal, and the jumper connecting terminals R and RC will be in place. Some thermostats have a jumper switch, some have a metal staple, others may have a plug, and the jumper may also just be a wire connecting the two terminals.

Which wires are which on a thermostat?

Thermostat Wiring Tips
The W wire is connected to your heating system. The Y wire is yellow and connects to your air conditioning compressor.The G wire is green and connects to the fan.Rc and Rh: The red wire(s) are the power source for your thermostat.

What is green wire on thermostat?

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 does W1 and W2 mean on a thermostat?

W/W1 and W2. In a conventional system, W/W1 controls your heating system and, where applicable, W2 controls your heating system’s second stage, which helps warm the home faster.

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