Where do the wires from the thermostat go?

Burl Dezzutti asked, updated on May 30th, 2022; Topic: thermostat
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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.

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Conjointly, where does C wire go on furnace?

Besides, where does the black wire go on a thermostat? More often than not, the black or blue wire connected to the C terminal is found in the newer β€œsmart” thermostats. The older thermostats may not have the β€œC” wire; they function on-demand while the new ones function all the time (continuously 24/7).

Event, what kind of wire does a furnace thermostat use?

The most common thermostat cabling is 18/5 (18 gauge, 5 conductor), because 5 conductors typically offer enough functions for a modern thermostat/low voltage device.

What are S1 and S2 wires on thermostat?

L: This terminal is designated for indicator lights on the thermostat, sometimes for when auxiliary or emergency heat is turned on, or if there's a general problem with your system. ... S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.

19 Related Questions Answered

How do I know if my C wire is connected to my furnace?

If there is a wire connected to the C terminal at the HVAC control board:
  • Note its color.
  • Check if there are any wires tucked behind the back of the thermostat with the same color.
  • If there is a matching wire, that should be your C wire.
  • How do you wire a thermostat for heat only?

    Should my thermostat be on E or F?

    The thermostat fan operation switch, labeled FUEL SWITCH in the diagram below, is factory-set in the "F" position. This is the correct setting for most systems. ... The "E" setting will allow the fan to turn on immediately with the heating or cooling in a system where the G terminal is connected.

    How do you wire a thermostat?

    Why does my thermostat have 7 wires?

    Generally speaking, a thermostat that controls only heat in your home will have two wires, and one that also controls air conditioning must have at least three or four wires. If your system also includes ventilation or a heat pump, the thermostat can have as many as seven wires.

    What color is the common wire?

    Red, Black, and White are the colors of switch wiring for three-ways. Red and Black are connected to the switches if the White is used for neutral. The White is often referred to as Common, but the colored wires are also used as hot wires.

    How do you wire a Honeywell thermostat?

    What's the C wire on a thermostat?

    WHAT IS A C-WIRE? A C-wire, or a common wire, runs from your low voltage heating system (24v) and carries continuous power to your thermostat. In today's electric market, most newer heating and cooling systems have C-wires, which guarantees compatibility for the installation of all smart thermostats.

    Where does C wire go on air handler?

    What is the G wire on a thermostat?

    G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat.

    Is the common wire black or red?

    The "common" is the "neutral" or "ground" wire, depending on the type of circuit. In normal US residential wiring, you'll have a black "hot" wire, a white "neutral" or "common" wire, and a green or bare "ground" wire.

    What happens if you connect a black wire to a white wire?

    If you see both sides connected together, it means it's a switch loop. The white wire that's connected to the black wire carries power to the switch. And the black wire that's in the same cable carries back that switched power to the outlet. But keep in mind what you should do when the wires are connected.

    How do you put a common wire in a thermostat?

    How do you wire a furnace?

    Do I need a jumper from R to RC?

    (Or the Y and O/B terminal if you have a heat pump system) In addition, the G terminal is activated to turn on the fan in your home to circulate the cooler air. ... If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals.

    What is the B wire in a thermostat?

    The common wire, usually labeled C, should go in the C Terminal of the Zen Thermostat. A wire labeled O, B, or O/B is used to control whether a heat pump is in heating or cooling mode. However, on some thermostats, a wire labeled B is the common wire C. In most cases, the common wire is labeled C.

    What does R and RC mean on thermostat?

    In a thermostat, the R wire is responsible for powering the entire HVAC system (through a transformer). If you have both an Rh (Red-heat for powering the heating) and an Rc (Red-cool for powering the cooling), then the R wire can be connected to either Rh or Rc.

    Can I use the G wire for the C wire?

    What is C wire required?

    A common wire (C-Wire) provides Wi-Fi thermostats continuous power by connecting it to a heating and cooling system (e.g. furnace). C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round).