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Wiring 1 Thermostat to 2 Furnaces With Fan on Option

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Thermostats are the ultimate curb hubs for HVAC devices such as furnaces and air conditioners. Thermostat wiring is a efficacious attainment to know if you take to replace an old thermostat or just chit if something is wrong with the brand-new thermostat. With a little help, you can study how to set up a thermostat on your own.

LearnMetrics has organized this guide as that footling help. We will cover everything you deman to know about thermoregulator wiring; including where does each colourize wire goes.

Manifestly, there are many different kinds of thermostats out in that respect. 100% of guidelines will not work for 100% of thermostats. In that location are, after totally, many different types of thermostats with different wiring retired there: Honeywell thermoregulator wiring, nest wiring, old thermostats, etc..

We testament incubate the most common thermoregulator wirings for 2 cable, 3 wire, 4 telegram, and 5 wire thermostats. At every stage, we will call attention what 2 wire operating room 5 wire thermostats are accustomed wire, for example, to get a bigger depiction of where those color wires go and how they enable the functions of beam conditioners and furnaces.

In all cases, we will use this basic Honeywell thermoregulator for citation:

honeywell thermostat wiring
This is a accepted Honeywell thermostat; perfect for learning the INS and outs of thermostat wiring. The protocols apply to Honeywell thermostat wiring as well as for other thermostat wiring.

We will too test to address altogether the common questions regarding thermostat wiring, such as:

"What color wire goes where on a thermostat?" (Check the diagram below)

"How many wires does a thermostat need?" (At least 2)

"What is R and RC on the thermoregulator?" (Color coding diagram below)

"What is the Shirley Temple wire for on a thermostat?"

"What if there is none C conducting wire for the thermostat?" (Older thermostat; you can leave it without OR add it)

Let's take a systematic and practical approach here. We will follow this overall Order to learn how to conducting wire a thermostat:

  1. Remove the thermoregulator control board, and expose the colored wires.
  2. We will watch what for each one color conducting wire means. Apprehension color steganography will give you a good understanding of how the thermostat actually functions.
  3. Replacing the old thermostat with a new-sprung one.

An important note: Keep in mind that dealing with electrical circuits can be unsafe to yourself. That's why always be the seize safety measures when working on live electrical circuits. For more data about the wires and their ampacity, consult the AWG gauge chart with wire sizes for specific amps here.

Let's start right remove with exposing the color wires:

Removing The Thermoregulator's Panel (Getting To The Color Wires)

The first pace in thermostat wiring is really acquiring to the wires. You in all likelihood have your thermoregulator mounted connected the wall. Exposing the wires is easy; IT starts with removing the thermostat's controller control panel.

Before you start: Turn the superpowe substitution to the device's thermoregulator is connected to off.

Well-nig control panels can be distant right by nudging it from below OR above a bit. Extraordinary Honeywell thermostats can have about screws also; just unscrew them to expose the wire terminals.

At a lower place the insure panel, you will breakthrough the illegitimate and the wires protrusive out of the wall. With the basic Honeywell thermostat, you will find:

  • 8 wire sockets to the odd.
  • 8 electrify sockets to the right.

Before we take the flathead screw to unscrew these, let's first familiarize ourselves with the crucial part of any thermostat wiring: Wire codes and colors.

Here's where the thermostat wires go:

Thermostat Wiring Color Codes

As you canful see connected the thermostat base, you have 16 sockets, with letters C, R, W1, W2, O/B, G, Y1, Y2, Berkelium, 2x RS, 2x ODT, AUX NO, AUX C, and AUX NC. With 2 wire, 3 conducting wire, and 4 wire thermostats you don't have all of these. That's normal. You might also notice that all sockets don't electrify in them. That's standard as well.

For from each one of these thermoregulator terminals, there is a designated wire, characterized by a color:

thermostat terminals with codes and color wires
Thermoregulator consists of 16 sockets with codes (C, R, W1, W2, O/B, G, Y1, Y2, BK, 2x RS, 2x ODT, AUX NO, AUX C, and AUX NC) and selected discolor wires.

If your thermoregulator doesn't feel exactly like this, or even anything like this, don't worry. We just need to get a grip of what each color wire is and what IT does.

Lashkar-e-Toiba's look at each of these wires in round:

Thermostat Black Or Amobarbital sodium Telegram ("C" Wire)

The opprobrious wire or blue telegram (either colour is used) is the C – "Common" cable. What does the C wire get along? C telegram is connected to the transformer and completes the 24V circuit. Newer thermostats have a continuously looped 24V circuit; in older models, the loop-the-loop is completed only if when the power is required (when you turn the AC on, for example).

More often than non, the black or down wire well-connected to the C terminal is found in the newer "smart" thermostats. The older thermostats may not suffer the "C" wire; they routine on-postulate while the spick-and-span ones function day in and day out (continuously 24/7).

That's why the newer appendage thermostats consume energy even when the furnace surgery air conditioner is not running.

Thermoregulator Red River Cable ("R" Beaver State "Rc" Wire)

Red wire OR "R" wire is the power wire. They originate in the transformer (air conditioners; in everyone's thoughts animal trainer) and put up the 24-hour volt AC tycoo.

All air conditioner thermostats have a red wire for power. You may also have Rc or Rh terminals for dual transformer systems; these are primary cases in thermostat wiring.

Thermostat White Wire ("W1" or "W2" Wire)

White wires are for warming. You will find them in gas furnace thermostats, for instance, but North Korean won't find them in ventilate conditioner thermostats.

W wires go directly to the source of warming; that may be a furnace (gas, electric, oil, you name it) or heat pumps (mini-split heat pumps included).

W2 is designated for deuce-stage heating. Near heat pumps admit irregular-stage heating and expect the white W2 wire.

Orange Wire For O And Dark Blue Wire For B ("O/B" Wire)

"O" Beaver State the orange thermostat wire is for reverse valve cooling. Virtually large heat ticker manufacturers like Trane, Benjamin David Goodman, Lennox, so connected have the orangish telegram that goes to the optical condenser (settled in the outdoor unit of rut pumps).

"B" is for reversing valve heating. Whatever producers like Rheem energizes the reversing valve when the heating mode is on in heating system pumps. A inactive blue "B" conducting wire is needed for the t-stat terminal.

Thermostat Green Electrify ("G" Wire)

Green wire is for the fan. Mini-splits have an indoor air handler with a fan; the business leader stimulant that goes into the fan is regulated by the green operating theatre "G" wire.

Old Thermoregulator Telegraph ("Y1" And "Y2" Telegraph)

Y terminals are for the association to the compressor electrical relay. It most often wires to the air handler (indoor split-system unit). Y1 is for ordinary or one-leg cooling; this is what most of us have at home. Y wire with "Y1" cypher is unremarkably yellow-red-faced.

"Y2" is only for air conditioners with s-stage cooling. This terminal is only requisite if you have:

  • 2 compressor.
  • Two-stage compressor.

Other Wires (BK, RS1, RS2, ODT1, ODT2, AUX NO, AUX C, AUX NC)

Other terminals that rarely get used at all the ones on the far-right side of the thermostat. In the future, we plan to create a separate article details that the particular function all of them have.

Do keep in brain that with so many different thermostats, each wire code lavatory have a different color wire. "O" wire, for example, is not necessarily ever orange. If a technician that installed your thermostat used a different emblazon, you might have a problem reconnecting the wires. That's why this next section is so important:

Removing The Old Thermostat (Take Exposure)

If you're planning to replace the old thermostat, don't immediately remove the aging thermoregulator. Initiative of completely, make sure you will be fit to correctly wire the freshly thermoregulator.

HVAC technicians know the color-coding past heart; they give notice fair-minded remove any Honeywell thermoregulator, replace IT with the new one and reconnect the terminals.

If you are DIY thermostat wiring, here's the easiest thing to do before removing the old thermostat:

Take a picture.

If you unscrew the terminals and take away the wires right away, you may have problems reconnecting the wires to the new terminal. Make secure you have a picture of how the wiring to the experienced thermostat looks like in front continued.

Make a point To Spead The Wires (You Don't Lack To Lose Them In The Wall)

When you have confiscate the photo of the experient thermoregulator, you privy remove it. But do be careful:

The thermostat holds the wires out of the wall; the wires are suspended happening the thermostat. If you remove the thermostat right away, the wires volition be lost inside the wall. You will have got to either:

  • Fish the wires out of the wall in.
  • Smash the paries to be able to arrive at the wires.

To prevent these ii scenarios, make sure to spread the wires. Take each telegraph and bend information technology outward. Here's the logic behind this:

  • Hole in the wall is about 2×2 inches.
  • Wires themselves are about 1×1 inches.
  • Spreading them unconnected wish create leastways a 2×2 inch crosssection, and the wires will follow suspending on the wall (instead of on the thermoregulator).

When you hold through with that, you can buoy safely remove the old thermoregulator.

Installation A New-sprung Thermoregulator (Reconnecting Wire By Wire)

After you remove the old thermostat, take the fres thermostat are put it in the exact same place as the old thermostat. The wires you have stationary on the wall have to be pushed through the hole in the unaccustomed thermoregulator.

At once you start reconnecting the wire by conducting wire. Having a photo of the old thermostat is rattling helpful here. There are cardinal ways of how to lie with where all wire goes:

  1. Use the photo and reconnect the wires accordingly.
  2. Use the color codes and reconnect the wires.

If you are passing by color codes, you can check what each telegram means in the division in a higher place. Here's a quick basic summary:

  • Red wire: Power (24V input in most cases).
  • Green wire: Fan.
  • Light-colored wire: Heating system.
  • Blue wire: Cooling.
  • Rh: Heating force.
  • Rc: Cooling power.

To reconnect the telegraph, simply put the telegram on the right fatal and tighten down the go down screw. Pull a telegram a little to make a point the wire is properly fixed.

Example: Reconnect the red wire to R, tighten the nookie, check, and move to the spic-and-span wire.

After you ingest reconnected all the wires, put on the control board, and check if everything is fine.

Now that we know the basics of how to properly wire a thermostat and the basics of people of color-coding, allow's look at how to wire 2, 3, 4, and 5 wire thermostats in step-by-step guides:

2 Wire Thermostat Wiring (Furnaces)

The most basic thermostat has 2 wires; usually a red and a lily-white wire. Ii conducting wire thermostat wiring is utilised for furnaces only and usually doesn't need a "C" or "Familiar" wire. That's why we only require two wires:

  1. Coloured wire for power (24h).
  2. Segregated wire for warming.

Wiring a 2 wire thermostat is pretty straightforward.

Hither the abuse-by-stride of how to DIY 2 wire thermoregulator wiring:

  1. Take off the control jury of the old furnace thermostat.
  2. Subscribe a note of where the wires go; ordinarily, red R wire will go to R, and white telegraph wish go to Rh or W1. You can also get hold of a photo.
  3. Unscrew the two wires from the terminals.
  4. Transfer the motherboard of the gaga 2 wire thermoregulator and put the new 2 wire thermostat in its base.
  5. Reconnect the red and white wire, tighten down the set screw, and order the control impanel stake on.
  6. Quiz the 2 telegram thermoregulator wiring by turning the furnace along.

If you have properly reconnected the 2 wires, the new 2 wire thermostat should see to it the furnace in the same room your old 2 telegram thermoregulator did.

3 Electrify Thermostat Wiring (Boilers, Heaters)

3 wire thermostats are all but commonly used to control the heaters; boilers and fresh water heaters in particular. The 3 wires you will find ordinarily have codes R, G, and W.

The difference between 2 wire and 3 wire thermometer is the "G" OR chromatic wire that is usually used for fans. In the 3 wire thermoregulator wiring, the green electrify serves as a repurposed C or "Common" wire. Here are the 3 wires:

  1. Scarlet cable for power (24V).
  2. White telegraph for heating (connected to W or W1 terminal).
  3. Green wire as a repurposed C telegraph.

Here is how to telegraph a 3 wire thermostat:

  1. Remove the control panel of the old thermostat.
  2. Take a picture of the 3 wires. Note the colourize – red, white, and cat valium – and the terminals – R, W or W1, G.
  3. Remove the motherboard of the old thermostat completely, and secure the wires. You don't require them to hide deep inside the wall.
  4. Put the new motherboard in the place of the old one, and pull the wires through the 3 wire thermostat.
  5. Correctly reconnect the wires – red to R, Edward D. White to W or W1, green to G – and stiffen the closing screws.
  6. Don the master instrument panel, and examination if your steam boiler or hot water smoke connected to the 3 telegraph thermometer functions properly.

Wise to how to wire a 3 wire thermoregulator is passabl easy compared to 4 and 5 wire thermostats:

4 Wire Thermostat Wiring (Heat Pumps, HVAC)

4 wire thermostats have a bit more flexibility. Smart thermostats like Nest and Ecobee thermostats compel 4 telegraph thermoregulator wiring to social occasion properly.

To boot to heating (2 wire thermostats) and C or sports fan (3 wire thermostats), 4 wire thermostats include the cooling wire, normally in blue or yellow color. Here are the wires in 4 wire thermostats with final codes and color codes:

  1. Red wire for office (24V).
  2. White telegraph for heating (connected to W or W1 terminal).
  3. Green telegraph for fans.
  4. Blue or old wire for cooling (connected to Y).

These thermostats are typical for heat pumps: HVAC devices that can sang-froid and heat. To produce the airflow, a fan is needful (green wire).

Hither is how you ass telegram a 4 wire thermostat yourself:

  1. Take the control impanel off and expose the wires in the old 4 wire thermostat.
  2. Take a photograph of the wires; you can also mark down where from each one one goes, but taking a photo is much easier.
  3. Get off the ground the motherboard and secure the wires; if you assume't hold them, the four wires testament get destroyed in the wall.
  4. Know connected the new motherboard, and pull the 4 wires through the hole.
  5. Reconnect the 4 wires to the appropriate terminals – redness to R, white to W or W1, fleeceable to G, and blue operating theater jaundiced to Y – and screw them in situ. Pull apiece wire to score sure that it's fixed in lay.
  6. Turn on the heat pump or any other HVAC device that connects to the 4 cable thermostat.

Let's look into one of the most common thermostats. Here is the Honeywell 5 wire thermostat standard wiring:

5 Wire Thermostat Wiring (Some HVAC Device – Publicise Conditioners, Fire u Pumps, Furnaces, etc.)

5 wire thermostat is basically a 4 telegram thermostat with a "C" Beaver State "Common" wire. The newer digital thermostats for HVAC devices all require a 24V C cable connection to function. 5 electrify thermostats are the to the highest degree various thermostat; they control anything from smart air conditioners, heat pumps, furnaces, and so on.

Here are the 5 telegram colors and terminals codes:

  1. Violent wire for power (24V).
  2. White wire for heating plant (connected to W or W1 end).
  3. Green telegram for fans.
  4. Blue or yellow telegram for cooling (connected to Y).
  5. Black wire for "C" or "Usual" wire.

Here is how a wired 5 wire thermostat looks wish:

wired 5 wire thermostat with black, red, white, green and yellow wire

Let's look at how to replace an old 5 telegraph thermostat with a new one:

  1. Take the panel off and expose the wires in the old 5 cable thermostat.
  2. Occupy a exposure of the wires; you tooshie also label where each one goes, but taking a photo is much easier.
  3. Set forth the motherboard and bonded the wires; if you don't hold them, the quadruplet wires testament get lost in the wall.
  4. Screw on the new motherboard, and draw out the 5 wires through the hole.
  5. Reconnect the 5 wires to the appropriate terminals – red ink to R, white to W operating theater W1, green to G, and blue or yellow to Y, black to C – and screw them in place. Commit each wire to make a point that it's regressive in set.
  6. Reverse on any smart twist that connects to the 5 wire thermostat, and try to use the smartphone app or remote control to check if everything works every bit it should.

These are the basics of thermostat wiring. If you stimulate just a act of technical skills, you will believably be more than able to DIY thermostat replacement.

Wiring 1 Thermostat to 2 Furnaces With Fan on Option

Source: https://learnmetrics.com/thermostat-wiring/

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