How to install a thermostat with 4 wires forced air, Ecobee smart thermostat, and a Thermostat Installation Guide.

A thermostat is an important part of your comfort system.Little maintenance is required for these thermostats, whichever type of thermostat you have.I find that most people don't know how to turn the thermostat on and off.Change the temperature setting.

This site is intended to help people go beyond the thermostat.We can help you learn more about their system.When they are not comfortable, a dial on the wall can be used to adjust the temperature.How to wire a thermostat.Hopefully, this page will help many people in the world of thermostats.

There are many other related articles.You can use the search feature to find other articles.

The thermostat isn't working properly is a very common complaint with service calls.Sometimes this is true, but often it is not the same as the thermostat.Some people think the only problem is with the thermostat.They purchase a brand new thermostat at the hardware store.

They get home and clean up.They change the thermostat without reading any instructions.Some people are successful at changing the thermostat.Someone may have read the instructions for the thermostat installation for you.A professional will install a new thermostat for the ones that are not successful.

If something is wrong, most people should call a professional.It can be with your thermostat or heating and cooling system.The thermostat may not be the problem.In the long run, the problem will cost more.If you have a multi-zone system, a high-efficiency heat pump or even just a heat pumps, you can also use an Apollo-based system.Call a professional.

The thermostat control circuit can be very complex and may require special sub-bases.There are different controls for heat pumps, and wires for these are multi-colored thermostat wires.These controls can be difficult to understand.The unit will not run correctly if the wire goes to the wrong terminal.

There are many different variations of this High Performance HVAC that will not be described here.If you see that you have the system described, you can proceed cautiously at your own risk.Here is a list of possible thermostat wiring combinations.

This covers most central air conditioners with an air handler or gas furnace.The wires cover red for hot, white for heat, yellow for cooling, green for the fan, and blue for common.

This is for a thermostat that is heat only or battery powered.Except for heat only, it covers the same control or color features as the 5-Wire thermostat wiring above.If you only have heat, you will have a red and blue wire, a white wire and a green wire.

This is common for a digital thermostat.It has both hot and cold wires along with the heat which is likely white.

This may be a heat only thermostat that is either digital or non-digital.The thermostat has battery power if it is digital.The wires are red for hot and white for cold.

You have control points if you have more than five wires.Refer to the heat pump wiring and thermostat wiring pages for more information.

Thermostats are equipped with heating and cooling anticipators.The heat anticipators can be adjusted in mechanical thermostats.Setting the heat anticipator is important.Only if you have a mechanical non-digital thermostat.

The control heating circuit has a draw on it.Make sure the heat anticipator is set correctly.It is in the thermostat.Proper settings make sure you get the best out of your heating system.

Selecting the right thermostat for your system is the first thing you should do when changing the thermostat.If you are retired or someone is at home during the day, you probably don't need a thermostat.If this is the case, the only benefit you will get from a thermostat is at night.You can set it in the morning so the unit comes on before you wake.

That way the house is warm when you get out of bed.The advantages of the thermostat will be described in a different section.You can proceed to the next step once you have made the thermostat selection.

If you decide to install your own thermostat, be aware of the Thermostat Wiring and Installation Advisory.There are many instances where the homeowner installed their own thermostat.The homeowner was unsuccessful in installing a new thermostat.The people that were unsuccessful wasted part of their day, ruined a thermostat and caused a malfunction in their system.

That doesn't include the fact that they called a professional to fix the problems.Problems can be caused by improper installation of a thermostat.If a professional was called first, the unsuccessful would pay three to four times what they would have paid.If there is any doubt, call a professional.The new thermostat needs to be installed by a professional.

The power should be turned off before you start installing your new thermostat.For both the boiler and the air handler.

Four wires are needed to control the heat, cooling, and blower or fan.Most air conditioning and heating systems have that.Make sure you mark the wires with masking tape if the colors don't match.There are wires that are not connected.That is not new.There are many varieties of thermostat wire.The thermostat wire bundle was used by the contractor who installed the system.They used what they had, twisted or cut off the other wires.

The power should be turned off to the air conditioning and heating unit at the circuit breaker.Any power going to the thermostat should be killed by it.To make sure the power is off, turn the thermostat to the on position.Make sure the unit isn't on by going to it.Circuit breaker labels are not always correct.

Emergency switches don't always function.Make sure you killed power to the unit.It's important to keep from blowing the transformer.I get calls from people who want to replace transformers because the homeowner changed the thermostat and didn't kill the power.Everything was hooked up correctly.During the process, they touched the wrong wires and blew the transformer, which powers the thermostat.

The thermostat has a cover on it.There should be a small tab in the center of the thermostat.That is the heat anticipator.The numbers should range from 1.5 to.1.Take note of this setting.The new thermostat should be set to the same setting.Only if you are replacing a mechanical thermostat.You might want to do this now.The digital thermostat should set itself automatically if you are replacing a mechanical thermostat.The new thermostat has instructions on how to set the anticipator.That is important.

An improper set anticipator will cause your furnace to run inefficiently.There are cooling anticipators in the thermostat.The cooling anticipators are often on the sub-base.

Attach the thermostat wires to their terminal using the color code.If they didn't match, you made color markings with masking tape.The wire is looped around the terminal screws.That isn't necessary.

The wires are attached to the terminals and they are tight.Make sure the bare wire doesn't touch anything except the terminal.You are almost done installing the thermostat once the wires are attached.The hard part is over.

There are additional answers to your questions in the thermostat category index.There are other questions about the thermostat on the website.You can use the thermostat wiring color code chart to figure out how to wire a thermostat.You can control and monitor the temperature when you are away with the help of the thermostats.You can have a smart home with these newer thermostats.They help you by saving energy.

There is a split system in this thermostat wiring diagram.The split systems include an air conditioner with a gas furnace, oil furnace or electric furnace.The wires are shown in red and white.These colors can be different.

One wire goes from the thermostat Y terminal to the condenser.The common side of the transformer is where the other wire comes from.The transformer is usually installed in the air handler.

In rare installations, the unit will have a transformer.The transformer was not installed in the condenser.The transformer was damaged in the past.The air handler was replaced in the condenser.

The colors here are typical.They can be different depending on who wired the unit.The color code is used by most HVAC technicians.There is a person who knows better than everyone else.Maybe the wiring color combination wasn't available for the new installation.

Keep in mind to properly dispose of hazardous materials.Mercury is extremely hazardous to human health and the environment, and older mechanical thermostats contain it.Most towns have a hazardous waste collection site.They will accept your old thermostat and dispose of it properly.

There are federal and state laws about properly disposing of hazardous waste.The old thermostat should not be thrown in the regular waste bin.Proper disposal of the old thermostat is important.For more information, please look at the products containing mercury and proper disposal.Products containing mercury can be found on the EPA website.

The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home is the Home Comfort Book.

You can use a UV light to kill harmful viruses in the air handler.The researchers used the UVC to kill the viruses.It requires a professional installation to turn on and off the blower fan in your air handler, but it will offer the protection you need for you and your family from any viruses.

I have an old mechanical thermostat that has only three wires, and I think my eyes are bad.There is an 11 story building where the building turns on the AC in the spring and the heat in fall.When the heat is on by the building, my heating and air conditioning system pumps out heat.I can't find a way to upgrade my thermostat.Any thoughts about this would be appreciated.

There are only two wires going to the thermostat in my furnace.I am replacing a thermostat that needs a wire.I can run an e wire bundle.I need to connect it to the old transformer.The current thermostat wires are connected to a TR connection.There is a connection point next to the TR connection.Can it be used as a wire connection?

Three thermostats are connected to a Weil-McLain boiler with 18-2 wire.I assume the transformer and switch are connected to the boilers and the circulators for the two zones.The third thermostat wire goes from the transformer to the third circulator.The new thermostats need power.The two thermostats that are connected to the relay get power from the Rh wire, whereas the third thermostat does not.The third zone gets heat when the thermostat is turned up.When the battery dies, the thermostat stops working.I don't know what I can do to get power to the third thermostat.

You need a common wire from the transformer to make work.The red and white wire is always hot.The thermostat is nothing more than a switch that opens and closes the transformer's hot leg.

I have an electric forced air furnace in my mobile home.The furnace has a switch on it.Two wires coming from the wall were replaced with a digital tstat.A/C runs constantly in the cool switch position and the new tstat unit works just fine for heat.To get the A/C to shut off, I have to replace the old tstat with a new one.Is there something I missed?

I need to look at a wiring diagram of the system.I think it has something to do with the switch and thermostat wiring.If you can't get it to work correctly, it's best to call a tech who knows control wiring.

I have an old water chilled/heated heating and cooling system with a honeywell thermostat.I want to upgrade my Tstat to a newer one.I think I need to use a 24VAC transformer (Honeywell Aube Technologies RC840T-120 Electromechanical transformer with Built In Relay from Amazon) to convert line voltage to 24v which is compatible with these newer Tstats but I am not sure how the wiring should look like.Any help would be greatly appreciated.Thank you so much!

I would love to help you, but I can't because I have to look at the system.I love doing things like this and have done many retro's for control circuits in the field, but every circuit is different with several different factors involved.You will need more than a new thermostat.You will need a few relays and basic control circuits.I would take the Ecobee over the NEST.Do you have an existing diagram for control circuits?Do you know the laws and rules of electrical and electronic circuits?In a matter like this, competency is important.If you don't have any of the experience or confidence to do it, then I would recommend calling a heating, ventilating, and air conditioning contractor.

Does the thermostat G terminal control the furnace fan?The air handler fan should run in a split system if not.

It depends on the age of the furnace.When in heat mode, modern furnaces use a control board that is based on a time increment for both the starting and stopping of the fan, while older furnaces used a mechanical type of relay to regulate the temperature in the heat exchanger.There is an explanation in this article at high

The heat is provided by heating elements in the system and it is necessary to have the fan running when the elements are not generating the heat.This can be done with a sequencer that is controlled off of the W terminal.

The fan relay is usually delayed to turn off to give the blower time to get rid of the excess heat in the heat exchanger.The electronics in the control board can be used for the delay.

I feel stupid asking, but I have replaced thermostats before and don't have a problem with diagrams.The new thermostat does not have phillips screws.You push the wire into the terminal and tighten it.You put the wire in, applied pressure to the end piece, and it was locked in.The screw needs to be loosened and tightened.

I have a problem with the 6 wires coming from the wall.They are pulled through a hole in the backplate and put into their respective terminal.It is difficult to get the wire bent at the right angle and even harder to tighten the screws.

I think I must be missing something.In one of the videos, they push the wire into the receptable with one finger.It has been hours and not done well yet.I don't know if the gauge on this wire is different.It looks like when someone uses the wrong size junction box, the wires are cramped.It is difficult to push the wires back into place so I can be sure that the connections are correct.

There is play in the wiring before the insulated cord shows from the wall.My only last ditch idea, which I am not crazy about, would be to cut a small square where the backplate goes, with the hopes that having more room to push the wire around would help.The temp is not the cause of the wiring.

If you point out something easy that I am missing, you won't hurt my feelings or ego.

Is it possible to see the little holes on the pliers?You take the insulation off the wire, stick it through the little hole, and bend it over.It makes a wire loop that goes under the screws and is more secure.

The parents house has an old gas furnace.The current control has a single push-button switch.3 heat settings can be used with gas control by a Valve Co. 3 position controller.There are four wires going to the controller: 24V direct from Xfmr, +3 wires, and one to each position terminal.The push-button switch has the same wires for each position as the gas controller.I would like to convert from the push-button switch to a thermostat, but not the digital one.Is there a way to convert this?Is it necessary for me to pick one of the gas settings and use it?Is there a thermostat that can control the gas valve?This is a gravity furnace with no fan.Thanks so much.

Three stage heating thermostats have terminals W1, W2, and W3.W1 is low, W2 is medium, and W3 is high.Different terminals have different temperature set points.When the temperature needs to turn to satisfy the set point, W1 would kick on.W2 would kick on if the temperature falls below the set point.I don't know if this would be appropriate for your situation because of how the 3 stage thermostat will work.If you have a phone number for the manufacturer of the furnace, I would call them and ask about it.It is possible that they have a solution for you.You could call a professional as a last resort.I am sure it can be done if they allow them to offer a solution.

When W2 calls, your controller may not allow that, so the staging thermostat has a problem.The same with W3.If the thermostat calls on W3 it could cause problems with the furnace controller.To make sure this won't be a problem, call the manufacturer or a professional to find a solution to the problem.

This set up won't work in a gravity furnace.I can give you a wiring diagram.

I have a wiring diagram of a push button.Before you put this type of money into this very old furnace, make sure the flue vent is working properly and the firebox is not cracked.

The website is great.I have a split system with a compressor and air hander.I have two transformers, one in the air handler and the other at the boiler.Should I use the transformer in the air handler to make a C wire?Or the transformer at the boiler?

You can find an article about 1 or 2 transformers here.The wire used for cooling and heat will be different.The hot wire should originate from the same transformer as the common.If it comes from the boiler or furnace, the common should also come from there.The common should be used if the hot wires come from the cooling system.

The off-on handle system of my gas floor heating system will need to be converted to a thermostat control system.

If it is line voltage (120+) or control voltage (24V), you need to figure that out first.A typical home thermostat will work where you wire to R and W.Purchase a line voltage thermostat and follow the instructions.Before doing any wiring, make sure you kill the power to the system and call a professional to do it for you.

I have two wires from the wall.It is only for heat.I put the same wire into R and W, but it's not marked.Do I need to find hot wire?

I have a hot water gas boiler to wires that run from it, I had the old mercury thermostat, so I am replacing it if I put the two wires together, but I run the wires to the new thermostat on red and white.

The only thing I can tell you is to make sure you have it set to heat and that the temperature set point is above the room temperature.You have a bad thermostat if it doesn't work after that.The correct terminals are R and W.

I have a thermastat that only has three wires, one black, red and white.I want to get the correct type.The base plate has copper trace lines and the front is a common round dial one with a few screws.Do I need a new one?What would I ask for?I plan to replace it with the same model.Thanks.

Is it a round thermostat?The old T-87 is the only thermostat like that that comes to mind.A newer round digital thermostat is made by Honeywell.You can't buy a mechanical thermostat if it is the old round.Mercury is illegal to sell now.You have to trace the wires to see where they go.What equipment do you have?Do you own an air conditioner with a gas furnace?Just a gas furnace?Is it a boiler with an air conditioner?Before buying a new thermostat, it is important to know all these things.It's probably best to call a pro with that combination.

I own an AC unit and a boiler.I would like to install a new thermostat that has a internet connection.The old thermostat wiring and the boiler can be sent to me.The wire running to the thermostat is not from the boiler.I need to wire the new thermostat.

If you have two different transformers in that system, you would need a thermostat with an RC/RH terminated in it.It is possible that you only have one thermostat.It depends on how the system was installed.It is difficult to say without looking at the system you have and how it was wired, so it is best to call a professional.

I bought a cool 18 seer 5 ton stright unit, but it can't run because it has 2 stage heating and cooling, can you help me?

It does not have heat if it is a 5 ton straight cool air conditioner.Straight cool means no heat.If your thermostat doesn't have a Y1 and Y2 then you can stage it.It needs two stages.It's probably best to call a contractor to wire this for you.They can identify what you have and wire it to you.

Hey.A bundle containing a C wire is required for a new digital tstat to be run.The tstat has a W and a C wire.I don't know if I need to run wire with W, R and C.Would it make sense to run a bundle with more wires if I were to install an air conditioner in the future?Thanks.

I don't know what the C stands for but it would be better to run a bundle of more wires in case you need to upgrade in the future.It sounds like that is a heat only thermostat and you either don't have air conditioning or if you do it is on a separate thermostat.If you have a central air conditioner system, I recommend combining the two thermostats into one thermostat that can handle both systems.It is easy to have both systems running at the same time, which is a waste of energy.At your local hardware store, you can pick up multiple bundled thermostat wire.

I want to know how to wire two heating units on the same thermostat.I have two heating units running in the same space.Thank you in advance.

We can't use one thermostat to control two different heating systems.

I have a room that is served by a rooftop unit.There is a thermostat in the same room that controls the thermostat on the perimeter heater.I have two T-stats in the same room.The unit is on the roof.

Unless you are an engineer or controls technician, you should call a professional to make this happen.I can't give you an answer on how to do this without being there.It is possible to control both systems with a single thermostat.

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