What is the white wire on my thermostat?
The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal W in industry-standard thermostats.
What is the W1 wire on a thermostat?
The W or W1 wire controls your heating system. In most systems, the Y or Y1 wire controls your cooling system. If you have a heat pump, your Y or Y1 wire controls your compressor. Your compressor is responsible for heating and cooling your home.
What is W1 and W2 on a thermostat?
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. In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster.
What color is the W1 wire on a thermostat?
White
Thermostat Wiring Color Code Chart
| Marking | Wire Color Code | Description |
|---|---|---|
| Rc | Red | Power from cooling, 24 Vac transformer |
| Rh | Red | Power from heat, 24 Vac transformer |
| C | Black/Blue | Common of 24 Vac transformer |
| W | White | Primary heat cell relay |
What are the wires on a thermostat?
Here is the industry standard thermostat wire color code used for most systems:
- White. The white wire connects to your heat.
- Yellow. The yellow wire connects to your compressor.
- Green. The green wire connects to the fan.
- Orange. This wire connects to your heat pump (if applicable).
- Red (C).
- Red (H).
- Blue.
Is W1 same as W?
W – When you see a W terminal, it just means heat. Usually, you will only see W when the control only has one stage of heat. W1 – Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool.
What is W1 O B on thermostat?
W, W1, W2: Just like the Y wire, the W wire(s) control the heating aspect of your system. O, B, O/B: These wires are responsible for switching the changeover valve in a heat pump system. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating.
What does W2 mean on a thermostat?
W2 – This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal.
What do the colors mean on thermostat wires?
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).
