Even the most seasoned people who enjoy DIY may come across problems with wiring a thermostat. I will explain that in a little more detail further down this page.

How to Wire a Thermostat | Wiring Installation Instructions

What I would like you to know is the information detailed below is based on the industry standard, yet not all thermostats will work this way simply because letters and numbers are used as well as color. So, this is what you might expect to see in terms of colored wires and what they mean:. They will be happy to accept your old thermostat and dispose of it properly.

Additionally, there are state and federal laws that are explicit about properly disposing of hazardous waste including products containing mercury. Please do not throw the old thermostat in the regular waste bin. Be responsible and properly dispose of the old thermostat. See the About the Author page for information about the author of this article. Photo Uploads If you are human, leave this field blank. If you want to include a description then do so here. Upload your photos or documents here!

Drop a file here or click to upload Choose File Maximum upload size: Hello I would like to know how to wire two heating Units on a same thermostat. Becasuse i have these two heating units running on a same open space. Thank you in advance. We cannot use one thermostat to control two different heating system which were controlled by two different thermostat.

You mentioned that some older tstats may have just an R and W wire, and therefore a new digital tstat may require new wire to be run a bundle containing a C wire. My old tstat has simply a W and a C black wire. Do I need to run wire that has W, R and C?


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And if so, would it save me a headache to run a bundle with more wires in case I install an air conditioner in the future? C refers to Common in the 24 volt circuit and on the old mechanical thermostat I am not sure what the C stands for but you do need three wires and yes it would be better to run a bundle of more in case in the future you upgrade.

I typically recommend that the two thermostats be combined into one thermostat that will handle both systems if in fact you do have a central air conditioner system. With two different thermostats it is easy to have both systems running at the same time which is a waste of energy. You can pick up multiple bundled thermostat wire at your local hardware store. Ibought a new 18 seer 5 ton stright cool condensing unit and can not get it to run it has 2 stage heating and cooling can you help me thanks. If it is a 5 ton straight cool air conditioner then it does not have heat. Straight cool means no heat, just cooling.

How to Wire a Thermostat | HVAC Control

If your thermostat does not have a Y1 and a Y2 then then you can stage it. It needs a two stage themostat. Probably best to call an HVAC contractor to wire this for you. They can quickly identify what you have and wire it properly for control. I have a separate boiler and AC unit. I would like to install a new thermostat that is a WIFI unit. I can send photos of the boiler and the old thermostat wiring. The wire running to the thermostat seams to be from the AC unit not the boiler. How should I wire the new thermostat.


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  7. It is also possible you only have one thermostat. It really depends on how the system was installed and wired. Probably best to call a professional to hook this up for you as it is difficult to say without looking at the system you have and how it was wired. So, do I need to get a new one like that?

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    Since I plan to replace it with the same type model.. Only thermostat like that that comes to mind is the old Honeywell T Honeywell does make a newer round digital thermostat. If it is the old round that is a mechanical thermostat you cannot purchase them any longer.

    Any products which contain mercury are illegal to sell now. As far as the wires are concerned you will have to trace them out to see where they go.

    And it depends on what you have for equipment? Do you have an air conditioner with a gas furnace? Just a gas furnace? A boiler with an air conditioner? All these things are important to know before buying a new thermostat. With that combination you describe it is probably best to call a pro. I only have 2 wires from wall. Or do I need to test and find hot wire? The only thing I can say is to make sure you check to make sure you have it set to heat and temperature set point is turned up above the room temperature. R and W are the correct terminals.

    If it is control voltage a typical home thermostat will work where you wire to R and W on the thermostat. If it is line voltage you need to purchase a line voltage thermostat and follow the instructions. Make sure you kill the power to the system before doing any wiring and if in doubt call a professional HVAC contractor to do it for you.

    How to Wire a Thermostat

    I have a split system hydroair for heat, compressor to air hander for AC. So, I have two transformers, one in the air handler, one at the boiler. To make a C wire should I use the transformer in the air handler?

    We have an article here concerning this matter and you can find it here — 1 or 2 transformers. The wire used for heat is typically going to be different for the wire used for cooling. The common should originate from the same source transformer where the hot wire originates from. So if it comes from the boiler or furnace whatever heating system you have then the common should come from there also.

    If the hot wires comes from the cooling system then you should use that common. The current control is a single push-button switch with 2 indicator lights. The controller has 4 wires going to it: Likewise, the push-button switch has 4 wires: Is there any way to do this conversion? Or are there thermostats that can control the 3-position gas valve? There are three stage heating thermostats you can purchase that have terminals W1, W2, and W3.

    Furnace 2 wire thermostat install

    Of course W1 would be low, W2 would be medium, and W3 would be high. These different terminals have differential temperature set points. W1 would kick on when the temperature need to turn to satisfy the set point. If the temperature keeps falling below the set point then W2 would kick on and the same between W2 and W3.