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What are the 5 wires in a thermostat?

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What are the 5 wires in a thermostat?

5 Wire Thermostat Wiring (Any HVAC Device – Air Conditioners, Heat Pumps, Furnaces, etc.)

  • Red wire for power (24V).
  • White wire for heating (connected to W or W1 terminal).
  • Green wire for fans.
  • Blue or yellow wire for cooling (connected to Y).
  • Black wire for “C” or “Common” wire.

What is the blue wire on a 5 wire thermostat?

The blue wire, or C-wire, is known as the common wire. It’s there to provide power to the thermostat. Older thermostats usually don’t have a C-wire because they either don’t need power or, if they do, they get it from a battery.

Are thermostat wires color coded?

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 identify thermostat wires?

Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.

What is the blue wire for a thermostat?

the Common wire
Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

Do I need to connect the blue wire on my thermostat?

The Blue or C Wire Blue wires are also called C wires because they are the Common wire. C wires are necessary for any smart thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

Where does the blue wire go on thermostat?

These wires are also called “C” wires because they’re known as the common wire. This wire allows the thermostat to connect to a power source constantly. Blue “C” wires are most common in thermostats that connect to your heat pump. This wire must connect to the B terminal on the thermostat.