How do you wire a thermostat wire to a furnace?

How do you wire a thermostat wire to a furnace?

Here’s how to wire a thermostat using the color code and, FYI, each terminal’s purpose.

1. Attach the red wire to the R terminal (Call for heating and/or cooling).
2. Attach the green wire to the G terminal (Fan).
3. Attach the white wire to the W terminal (Heat).
4. Attach the yellow wire to the Y terminal (AC).

What colors are thermostat wires?

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.

Where does red wire go on thermostat?

The red wire should be connected with the Thermostat RH terminal. You can also connect it to the RC terminal with a jumper wire between the RH and the RC. If you only have one R terminal for both heating and cooling, connect it to that.

How do I wire a 2 wire thermostat?

Most two-wire thermostats wire have a red and white wire encased in a brown insulated coating. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Connect the white wire to the “W” terminal on the furnace and thermostat.

Can you replace a 2 wire thermostat with a 4 wire thermostat?

Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.

What is the difference between 2 wire and 4 wire thermostat?

Double pole thermostats have an “off setting” and break both sides of the heater’s power line. They typically have four (4) connection wires. Single pole thermostats only have a “low” setting and no true “off” setting, and break only one side of the heater’s power line.

What happens if you wire a double pole thermostat wrong?

With a double pole (4-wire) thermostat, you’ll have either 4 wires or 4 terminal screws. If it’s terminal screws, two of them will be marked L1 and L2 or Line 1 and Line 2. These normally go to the incoming 240 volt power. If you get it wrong, you’ll trip the breaker and/or destroy the thermostat.

Can you wire a double pole thermostat as a single pole?

You can use double-pole thermostats as single pole units. Most double-pole line voltage thermostats will break only one pole when cycling on and off. Connecting the poles together in parallel as you planned will not work.

What is the difference between double pole and single pole thermostat?

A single pole thermostat operates off one circuit, and therefore cannot operate separately. Because of this the single pole thermostat cannot be turned off, but only turned down. A double pole circuit, however, has two directional currents providing a double pole thermostat the ability to turn off completely.