Home Improvement

How should a Honeywell thermostat be wired?

Where do the wires go on a Honeywell thermostat?

You'll tie it to the blue. You take the red wire and tie to the yellow this is something that you may not need to deal with but if I say hey go to your air handler. And look for a transformer.

How is my thermostat supposed to be wired?

Thermostat Wiring Tips



The W wire is connected to your heating system. If your thermostat controls your heat, you will have a white wire. The Y wire is yellow and connects to your air conditioning compressor. The G wire is green and connects to the fan.

How do I wire a new Honeywell thermostat?

You're going to need a little screwdriver for this unless your new thermostat has little push buttons that makes it easier you just stick it in and push push on the button.

What color wire goes where on a thermostat?

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).

What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

Why is there a jumper between R and RC?

However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat. This wire is also known as the RH wire.

How do I install my Honeywell thermostat?

With the thermostat. Cover removed you can now take a picture of the wiring layout for this thermostat. In case you ever want to install it somewhere else in your home.

How many wires does a thermostat need?

2 wires

The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire. That’s why we only need two wires: Red wire for power (24h).

How do I know if C wire is live?

Begin by putting one probe whichever probe you want on the rh wire and test every other wire with the other probe. One of the wires will show up is 24 volts and that is your c wire.

Does R go to RC or RH?

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.

What does black wire connect to thermostat?

This the Common Terminal, and usually, a blue or black wire is run to the transformer from this terminal to complete the circuit, and in some cases, provide power to the Thermostat. This terminal is found on thermostats designed to work with Heating Pumps and is used to power the defrost cycle on the heat pumps.

What are common wires?

The common wire is normally the white wire, at least in the United States, and is often called the neutral wire. It’s also called common because all circuits in the house typically have the white wires tied together, which means every circuit has that wire in common.

What are the 4 wires on a thermostat?

4 Wire Thermostat Wiring (Heat Pumps, HVAC)



Here are the wires in 4 wire thermostats with terminal codes and color codes: Red wire for power (24V). White wire for heating (connected to W or W1 terminal). Green wire for fans.

How do I install my Honeywell thermostat?

With the thermostat. Cover removed you can now take a picture of the wiring layout for this thermostat. In case you ever want to install it somewhere else in your home.

What are the 5 thermostat wires?

Here are common uses for wire colors:

  • Blue or Black – C – Common wire, may be unused by your existing thermostat. …
  • Red – R – 24VAC power from the furnace’s transformer.
  • Red – Rc – 24VAC (dedicated to heat call)
  • Red – Rc – 24VAC (dedicated to cooling call)
  • Green – G – Fan.
  • White – W – Heat.
  • Yellow – Y – Air conditioner.


What is W1 and W2 on a thermostat?

W/W1 and W2. 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.

What are S1 and S2 wires on thermostat?

S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.

Is R wire RH or RC?

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.

Is W2 and e wire the same?

W2 is generally called on based on a temperature differential between setpoint and space, outdoor temperature, or run time. W3 – This is just the next stage of heat after W2. E – Is emergency heat, usually just a way to manually drive on what would normally be the secondary form of heat without stage 1 heating.

What is E on thermostat wiring?

Some thermostats have an E connector. The E wire turns your emergency heat on or off. Emergency heat is usually used when it’s too cold outside for your regular heater to keep your home warm. Learn more about emergency heat.

What is RC on a thermostat?

RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system but not in a five-wire heating/cooling system.)

Can you jump W1 and W2?

If W1 is only wired up, it will always run in 1st stage, 2nd won’t come on unless W2 is wired to a two stage t-stat, or jumper to it.

What is G wire on thermostat?

G-wire – Fan, usually green. Y-wire – Cooling, usually yellow. W-wire – Heat, usually white.

Is G wire necessary?

As you mentioned, you don’t usually need a G wire for heating mode, but you do for cooling. In special circumstances a relay could be wired up inside of the air handler to make the fan come on with a call for cooling, but normally it’s the thermostat that makes the connection that makes the fan come in in cooling mode.

What does O and B mean on a thermostat?

The O/B terminal is for heat pump systems and is used for the reversing valve. When the “O” option/position is selected the reversing valve defaults to the heating mode. If the “B” option/position is selected the reversing valve defaults to the cooling mode.

Is the RC wire the same as C?

The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.

What color is the C wire?

Blue wires

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 do I connect the C wire on my furnace?

The common terminal is going to be right here so if you're installing. Something you would stick the wire. Into this screw terminal from the bottom.

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