Can I Connecting Blue Wire From Thermostat to Blue Wire Coming Out From Hvac
Thermostats are the ultimate control hubs for HVAC devices such as furnaces and air conditioners. Thermostat wiring is a useful skill to know if you have to supervene upon an one-time thermostat or just cheque if something is wrong with the new thermostat. With a niggling help, you lot tin larn how to install a thermostat on your own.
LearnMetrics has designed this guide as that little help. Nosotros will encompass everything you demand to know nearly thermostat wiring; including where does each colour wire goes.
Obviously, there are many different kinds of thermostats out at that place. 100% of guidelines will not work for 100% of thermostats. There are, afterwards all, many dissimilar types of thermostats with dissimilar wiring out there: Honeywell thermostat wiring, nest wiring, one-time thermostats, and so on.
We will cover the nigh common thermostat wirings for 2 wire, iii wire, four wire, and v wire thermostats. At every stage, we will point out what 2 wire or 5 wire thermostats are used to wire, for case, to get a bigger picture of where those color wires get and how they enable the functions of air conditioners and furnaces.
In all cases, nosotros will employ this basic Honeywell thermostat for reference:
Nosotros volition also endeavour to accost all 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 to the lowest degree 2)
"What is R and RC on the thermostat?" (Color coding diagram below)
"What is the blackness wire for on a thermostat?"
"What if there is no C wire for the thermostat?" (Older thermostat; y'all tin leave it without or add it)
Let'southward take a systematic and applied arroyo here. We will follow this general order to larn how to wire a thermostat:
- Remove the thermostat command panel, and expose the colored wires.
- Nosotros will larn what each color wire means. Understanding color coding will requite you a skillful understanding of how the thermostat actually functions.
- Replacing the old thermostat with a new one.
An important note: Keep in heed that dealing with electric circuits can be harmful to yourself. That's why always follow the appropriate prophylactic measures when working on alive electrical circuits. For more information nigh the wires and their ampacity, consult the AWG approximate chart with wire sizes for specific amps hither.
Let's start right off with exposing the color wires:
Removing The Thermostat's Control Console (Getting To The Color Wires)
The kickoff step in thermostat wiring is actually getting to the wires. You lot probably have your thermostat mounted on the wall. Exposing the wires is easy; information technology starts with removing the thermostat'south control panel.
Before you start: Turn the ability switch to the device's thermostat is connected to off.
Most command panels can exist removed just by nudging it from beneath or above a bit. Some Honeywell thermostats tin have some screws as well; just unscrew them to expose the wire terminals.
Beneath the control panel, you will discover the base and the wires sticking out of the wall. With the bones Honeywell thermostat, you will find:
- viii wire sockets to the left.
- 8 wire sockets to the right.
Before we take the flathead spiral to unscrew these, allow'south offset familiarize ourselves with the crucial part of any thermostat wiring: Wire codes and colors.
Here'southward where the thermostat wires go:
Thermostat Wiring Color Codes
Equally you tin run into on the thermostat base, you have sixteen sockets, with letters C, R, W1, W2, O/B, Grand, Y1, Y2, BK, 2x RS, 2x ODT, AUX NO, AUX C, and AUX NC. With 2 wire, 3 wire, and 4 wire thermostats you don't accept all of these. That's normal. You might also detect that all sockets don't wire in them. That'southward standard besides.
For each of these thermostat terminals, at that place is a designated wire, characterized by a colour:
If your thermostat doesn't look exactly like this, or even anything similar this, don't worry. We just need to become a grip of what each color wire is and what information technology does.
Let'due south look at each of these wires in turn:
Thermostat Black Or Blueish Wire ("C" Wire)
The black wire or blueish wire (either color is used) is the C – "Common" wire. What does the C wire do? C wire is connected to the transformer and completes the 24V electric circuit. Newer thermostats have a continuously looped 24V circuit; in older models, the loop is completed simply when the power is required (when you lot turn the Air-conditioning on, for instance).
More than often than non, the black or blue wire connected to the C terminal is institute in the newer "smart" thermostats. The older thermostats may not take the "C" wire; they function on-need while the new ones function all the time (continuously 24/seven).
That's why the newer digital thermostats consume energy even when the furnace or air conditioner is non running.
Thermostat Red Wire ("R" or "Rc" Wire)
Red wire or "R" wire is the ability wire. They originate in the transformer (air conditioners; in the air handler) and provide the 24-hour volt Ac power.
All air conditioner thermostats have a red wire for ability. Yous may also have Rc or Rh terminals for dual transformer systems; these are special cases in thermostat wiring.
Thermostat White Wire ("W1" or "W2" Wire)
White wires are for heating. You will find them in gas furnace thermostats, for example, but won't find them in air conditioner thermostats.
W wires become directly to the source of heating; that may be a furnace (gas, electric, oil, you name it) or heat pumps (mini-split estrus pumps included).
W2 is designated for ii-stage heating. Near rut pumps include second-stage heating and require the white W2 wire.
Orange Wire For O And Nighttime Blue Wire For B ("O/B" Wire)
"O" or the orange thermostat wire is for reverse valve cooling. Most bigger estrus pump manufacturers like Trane, Goodman, Lennox, and so on accept the orangish wire that goes to the condenser (located in the outdoor unit of oestrus pumps).
"B" is for reversing valve heating. Some producers like Rheem energizes the reversing valve when the heating way is on in heat pumps. A nighttime blue "B" wire is needed for the t-stat terminal.
Thermostat Green Wire ("Chiliad" Wire)
Green wire is for the fan. Mini-splits take an indoor air handler with a fan; the ability input that goes into the fan is regulated by the green or "G" wire.
Yellow Thermostat Wire ("Y1" And "Y2" Wire)
Y terminals are for the connectedness to the compressor relay. Information technology near often wires to the air handler (indoor split-system unit). Y1 is for ordinary or i-phase cooling; this is what virtually of us have at dwelling house. Y wire with "Y1" code is usually xanthous-colored.
"Y2" is only for air conditioners with 2nd-stage cooling. This last is merely required if y'all take:
- 2 compressor.
- Ii-stage compressor.
Other Wires (BK, RS1, RS2, ODT1, ODT2, AUX NO, AUX C, AUX NC)
Some other terminals that rarely get used at all the ones on the right side of the thermostat. In the future, nosotros plan to create a separate commodity details that the specific function all of them have.
Do keep in listen that with so many different thermostats, each wire code can have a dissimilar colour wire. "O" wire, for case, is non necessarily always orangish. If a technician that installed your thermostat used a different color, you might take a problem reconnecting the wires. That's why this next section is then important:
Removing The Sometime Thermostat (Take Photo)
If you're planning to replace the old thermostat, don't immediately remove the old thermostat. Starting time of all, make sure you will be able to correctly wire the new thermostat.
HVAC technicians know the color-coding by centre; they tin simply remove whatever Honeywell thermostat, supervene upon it with the new one and reconnect the terminals.
If you are DIY thermostat wiring, hither'due south the easiest thing to do earlier removing the old thermostat:
Take a picture.
If you unscrew the terminals and remove the wires right away, you may have bug reconnecting the wires to the new terminal. Make sure you have a picture of how the wiring to the old thermostat looks like before continuing.
Make Sure To Spead The Wires (You Don't Want To Lose Them In The Wall)
When y'all accept taken the photo of the old thermostat, you can remove it. Just exercise exist conscientious:
The thermostat holds the wires out of the wall; the wires are suspended on the thermostat. If you remove the thermostat right away, the wires will be lost inside the wall. You will take to either:
- Fish the wires out of the wall.
- Boom the wall to be able to reach the wires.
To prevent these ii scenarios, make certain to spread the wires. Take each wire and bend it outwards. Here'south the logic behind this:
- Hole in the wall is nigh 2×2 inches.
- Wires themselves are about 1×1 inches.
- Spreading them apart will create at least a two×2 inch crosssection, and the wires volition be suspending on the wall (instead of on the thermostat).
When you have done that, yous can safely remove the quondam thermostat.
Installing A New Thermostat (Reconnecting Wire By Wire)
After you lot remove the old thermostat, accept the new thermostat are put information technology in the verbal same place as the old thermostat. The wires you have fixed on the wall accept to be pushed through the hole in the new thermostat.
Now you lot start reconnecting the wire by wire. Having a photograph of the onetime thermostat is very helpful hither. In that location are two ways of how to know where each wire goes:
- Use the photo and reconnect the wires appropriately.
- Utilise the color codes and reconnect the wires.
If you are going by color codes, you tin cheque what each wire means in the section to a higher place. Here's a quick basic summary:
- Blood-red wire: Power (24V input in most cases).
- Green wire: Fan.
- White wire: Heating.
- Blue wire: Cooling.
- Rh: Heating ability.
- Rc: Cooling power.
To reconnect the wire, simply put the wire on the right terminal and tighten down the set screw. Pull a wire a flake to make sure the wire is properly fixed.
Example: Reconnect the red wire to R, tighten the screw, check, and move to the new wire.
After yous take reconnected all the wires, put on the command board, and check if everything is fine.
Now that we know the basics of how to properly wire a thermostat and the nuts of color-coding, allow's look at how to wire 2, 3, four, and v wire thermostats in footstep-by-step guides:
2 Wire Thermostat Wiring (Furnaces)
The near basic thermostat has two wires; usually a ruddy and a white wire. 2 wire thermostat wiring is used for furnaces only and commonly doesn't need a "C" or "Common" wire. That'southward why we only demand two wires:
- Red wire for ability (24h).
- White wire for heating.
Wiring a two wire thermostat is pretty straightforward.
Here the step-past-footstep of how to DIY 2 wire thermostat wiring:
- Remove the control console of the old furnace thermostat.
- Take a notation of where the wires get; usually, red R wire volition go to R, and white wire will become to Rh or W1. You tin can too take a photograph.
- Unscrew the two wires from the terminals.
- Remove the motherboard of the old 2 wire thermostat and put the new 2 wire thermostat in its place.
- Reconnect the cherry-red and white wire, tighten down the gear up screw, and put the command console dorsum on.
- Test the 2 wire thermostat wiring by turning the furnace on.
If you lot have properly reconnected the 2 wires, the new 2 wire thermostat should control the furnace in the same way your old two wire thermostat did.
3 Wire Thermostat Wiring (Boilers, Heaters)
3 wire thermostats are most commonly used to control the heaters; boilers and hot water heaters in item. The 3 wires you will find commonly have codes R, Yard, and W.
The difference between 2 wire and 3 wire thermometer is the "G" or dark-green wire that is usually used for fans. In the 3 wire thermostat wiring, the green wire serves equally a repurposed C or "Common" wire. Hither are the three wires:
- Red wire for ability (24V).
- White wire for heating (continued to Westward or W1 terminal).
- Green wire as a repurposed C wire.
Hither is how to wire a 3 wire thermostat:
- Remove the command panel of the onetime thermostat.
- Take a picture of the 3 wires. Annotation the color – red, white, and dark-green – and the terminals – R, W or W1, G.
- Remove the motherboard of the old thermostat completely, and secure the wires. You don't want them to hide deep inside the wall.
- Put the new motherboard in the place of the erstwhile one, and pull the wires through the iii wire thermostat.
- Correctly reconnect the wires – cherry-red to R, white to W or W1, dark-green to One thousand – and tighten the terminal screws.
- Put on the control panel, and exam if your boiler or hot water heater continued to the iii wire thermometer functions properly.
Knowing how to wire a three wire thermostat is adequately like shooting fish in a barrel compared to four and 5 wire thermostats:
4 Wire Thermostat Wiring (Heat Pumps, HVAC)
4 wire thermostats accept a scrap more flexibility. Smart thermostats like Nest and Ecobee thermostats require 4 wire thermostat wiring to office properly.
In addition to heating (2 wire thermostats) and C or fan (iii wire thermostats), 4 wire thermostats include the cooling wire, usually in bluish or xanthous color. Here are the wires in four wire thermostats with final codes and color codes:
- Crimson wire for power (24V).
- White wire for heating (continued to W or W1 terminal).
- Greenish wire for fans.
- Blue or yellow wire for cooling (continued to Y).
These thermostats are typical for rut pumps: HVAC devices that can cool and rut. To produce the airflow, a fan is needed (green wire).
Here is how yous tin can wire a iv wire thermostat yourself:
- Accept the command console off and betrayal the wires in the old 4 wire thermostat.
- Take a photograph of the wires; y'all tin can too characterization where each one goes, but taking a photo is much easier.
- Take off the motherboard and secure the wires; if you don't hold them, the four wires will get lost in the wall.
- Screw on the new motherboard, and pull the four wires through the hole.
- Reconnect the 4 wires to the advisable terminals – cherry-red to R, white to W or W1, greenish to Thou, and blue or xanthous to Y – and screw them in place. Pull each wire to make certain that information technology's fixed in place.
- Turn on the heat pump or whatsoever other HVAC device that connects to the iv wire thermostat.
Let's await into one of the most common thermostats. Here is the Honeywell five wire thermostat standard wiring:
5 Wire Thermostat Wiring (Whatsoever HVAC Device – Air Conditioners, Rut Pumps, Furnaces, etc.)
5 wire thermostat is basically a four wire thermostat with a "C" or "Common" wire. The newer digital thermostats for HVAC devices all require a 24V C wire connexion to function. 5 wire thermostats are the about versatile thermostat; they control anything from smart air conditioners, heat pumps, furnaces, and so on.
Hither are the 5 wire colors and terminals codes:
- Red wire for ability (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellowish wire for cooling (continued to Y).
- Black wire for "C" or "Mutual" wire.
Here is how a wired 5 wire thermostat looks like:
Permit'southward await at how to replace an old 5 wire thermostat with a new i:
- Take the control panel off and expose the wires in the former five wire thermostat.
- Accept a photograph of the wires; you tin likewise characterization where each one goes, just taking a photograph is much easier.
- Accept off the motherboard and secure the wires; if you don't agree them, the four wires will get lost in the wall.
- Spiral on the new motherboard, and pull the 5 wires through the hole.
- Reconnect the five wires to the appropriate terminals – red to R, white to Westward or W1, green to K, and bluish or xanthous to Y, blackness to C – and screw them in place. Pull each wire to make certain that it's fixed in identify.
- Turn on whatsoever smart device that connects to the v wire thermostat, and try to use the smartphone app or remote command to check if everything works as it should.
These are the basics of thermostat wiring. If you have simply a bit of technical skills, y'all will probably exist more than than able to DIY thermostat replacement.
Source: https://learnmetrics.com/thermostat-wiring/
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