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.
What is the orange wire for on thermostat?
heat pump
The Orange Wire
The orange thermostat wire links to your heat pump, if you have one. It terminates in your outdoor condenser for reversing valve operation from hot to cold. The orange wire connects to terminal O on your thermostat. The orange wire only applies to homeowners with an air-source heat pump.
What is the blue wire on Honeywell thermostat?
Quote from the video:
Quote from Youtube video: This is a honeywell pro 3000 so here's what you got let's talk about this you got a blue wire. Okay that's a common. And then you have a red wire. That's the hot this blue and red wire actually goes
Where does the blue wire go in the Nest thermostat?
C connector
A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat. If the B wire is blue, it should most likely be connected to the C connector.
What are the 5 thermostat wires?
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.
