Additionally, make sure the heat anticipator is set properly. Furthermore, an improperly set anticipator will cause your furnace or heater to run improperly. You can use a level to do this. If I selected "fan on" instead of "fan auto" the zone would heat up but would not shut off (hot water kept flowing even if I selected a temp below room temp). 4 If it doesn’t work after that, then you have a bad thermostat. Using the Blue Female Connector provided, attach the Yellow Wire to EITHER terminal on the Thermostat Switch. Typically, a heat pump will require more wires than any other HVAC system. This is common for a digital thermostat that controls a boiler. Question: I have a split system (hydroair for heat, compressor to air hander for AC). The thermostat may need to be configured to your heating system. Green – The green wire connects to the fan. So I have a hot water gas boiler to wires running from it the I had the old mercury thermostat so I’m replacing it out if I put the two wires together it makes the boiler function it comes on but I run the wires to the new thermostat red on red and white on white nothing happens white on red red on white Again nothing happens. I do love doing things like this and have done many retro’s for control circuits in the field but every circuit is different along with several different factors involved in the control circuit. recommended wire sizes: 8-10 ga: fan power and ground. Additionally, see the thermostat wiring color code chart to help with How to Wire a Thermostat. The furnace can do it with actual temperature sensors (furnace controls the fan) or the thermostat can do it with start-up and shut-down delays. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. This electrical wiring question came from Christie in Phoenix, Arizona. The thermostat wiring on these systems can have very similar wiring properties. I am trying to rewire a 5 wire Honeywell thermostat. Call a professional to install and wire the new thermostat. It should have the same setting as the old anticipator setting. That will help with wiring the new thermostat. All other wires, except the common wire, controls a specific relay or contactor. The bit should match the size of the wall anchors you have. Most two-wire thermostats wire have a red and white wire encased in a brown insulated coating. I can send you a wiring diagram of how this is. The rooftop unit is doing cooling and heating. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. Whether it is with your thermostat or HVAC system. With today’s programmable thermostats and Wi-Fi thermostats, wiring your own system has never been easier.However, it still requires a thorough setup. (or if they didn’t match, the color markings you made with masking tape). This article describes types of line voltage wall or floor thermostats used to control heating or heating & cooling equipment where switching of 120V or 240V devices is required. Go back up into the attic and drive a wire staple within 12 in. Some people like to loop the wire around the terminal screws. 12v switched wire to green wire at a/c clutch. Selecting the proper thermostat.If you are retired or if someone is at home during the day you likely do not need a programmable thermostat. Following the thermostat manufacturer's directions, connect the wire leads marked "line" to the wires entering the box from the service panel. Step 3 . or the transformer at the boiler? I have a fan for a greenhouse that I need to turn on at certain times to counteract the Texas heat, I was just wandering if I could just go to a garage sale and buy one then wire it to the power chord or is there a special small one that plugs into the wall socket. Is this possible? Two zones are connected to Honeywell switching relays, which I assume has a transformer and a switch, and it is connected to the boilers and the circulators for each of those zones. Insert this into the hot wire of the fan, leave the neutral return wire unbroken. All these things are important to know before buying a new thermostat. If you have more than five wires then you have more control points or you have a heat pump. The simplest setup for a heating system is a two-wire thermostat. Connect the wire leads marked "load" to the wires running to the baseboard heater. Try pulling the wires a bit to see if there is more wire behind the wall. New tstat unit works just fine for heat however in cool switch position A/C runs constantly. This commission helps us pay for the overhead of running this website. The fan can run longer than when the thermostat ends a call for heat. So, do I need to get a new one like that? With two different thermostats it is easy to have both systems running at the same time which is a waste of energy. So you would need the little furnace transformer to go with it and then a relay to switch on the fan. Connect the black wire from the fan to the red wire from the thermostat. In rare installations, the condensing unit will have the transformer. In any case, be it gas or electric, 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. Setting the heat anticipator is important for your heating system. Pull the sub-base off the wall and wrap the wires around the pencil or pen. Make sure the wires securely connect to one another. A large majority of homes today have an HVAC system containing a Furnace (Oil, Gas or Electric) and An A/C Unit. The red wire is the source hot wire from the transformer. Finally, it has 24-volt hot and 24-volt common along with the wire for the heat which is likely white. It’s just for heat. If the colors of the wires do not match the colors described here, make sure you mark the wires with masking tape. The red wire is the source hot wire from the transformer. Additionally, for heat pumps, there are different controls, and wires for these controls run into the thermostat, they are multi-colored thermostat wires. Answer Proper settings ensure you will get the best out of your heating system and your thermostats. If the thermostat calls on W3 then you would have all three energized and that may cause problems with the furnace controller. Other questions about a Honeywell thermostat, Honeywell thermostats, programmable Honeywell thermostats are found at the Honeywell Thermostat website. It's simple wiring. You probably want to do this now before you proceed further. There are many incidences where the homeowner installed their own thermostat and was successful. To wire a thermostat, you must first be aware of the type of system that you have in your home. If the bit is bigger, the wall anchor will not hold. Finally, additional information on products containing mercury can be found on the EPA website. It is mandatory to procure user consent prior to running these cookies on your website. Dave’s Reply: Thank you for your electrical wiring questions. Hold it up to the wall in the position you want it. Furthermore, most municipalities have a hazardous waste collection site. And the possibility exists that the thermostat will fall off the wall. Furthermore, what is necessary is that the wires are attached to the terminals, and they are tight. Step 5 Run an additional wire from the furnace to the terminal in the thermostat labeled G. This is … The Nest Learning Thermostat, Ecobee, Sensi, and other WiFi thermostats, including Honeywell WiFi t-stats allow remote control and monitoring so you can check or change the temperature when you are away. Step 8 Install the thermostat box cover, and use the screwdriver to set the thermostat so that the fan … So, I have 2 T-stats in the same room. Use the wire nuts to connect the wires from the thermostat to those of the fan. advisory and disclaimer for installing a new thermostat, list of tools commonly needed to install a new thermostat, step by step instructions on changing your thermostat along with hints and tips for making the job easier, lots of extra links to other articles to make sure you completely understand everything you need to know. Once the wires are attached, you are almost finished completing the task of installing the thermostat. Make sure the wires securely … Thermostats have cooling anticipators. An attic fan is an electric exhaust fan that mounts in your home's attic. These cookies do not store any personal information. These thermostats, whichever type of thermostat or thermostats you have, require little maintenance. The same with W3. Or do I need to test and find hot wire? Great website. I want to add a 5/2 programmable in line thermostat. The thermostat is nothing more than a switch that opens and closes the 24 volt hot leg off the transformer. As far as the wires are concerned you will have to trace them out to see where they go. Any trash or dust will fall into the bag and not onto the floor. Thermostats for electric-baseboard heaters operate at the same voltage as the heater—usually 240 volts. A thermostat acts as a switch... but generally not a switch that can carry a lot of current or voltage. Before seen ur site I haven’t any knowledge about package unit and about thermostat. So i want to get the ‘correct type’. Cut the wires with a wire cutter if they are attached to a defunct heating appliance. I only have 2 wires from wall. Gas Heating Troubleshooting and Repair Index, Questions You Need To Answer Before Changing the Thermostat, How to Wire a Thermostat – Selecting the Proper Tstat, Before You Begin Replacing the Old Thermostat, Steps and Procedures for Installing the new Thermostat, How to Wire a Thermostat – The Colors and Terminals, How to Wire a Thermostat – Removing Wires, The Colors and Terminals on the New Tstat, How to Wire a Thermostat – Thermostat Wiring Diagram, UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health, Successful Thermostat Installation Advice Article, Helpful Page to help you select the right thermostat, HVAC Products Containing Mercury and Proper Disposal, https://highperformancehvac.com/honeywell-furnace-fan-limit-control-temperature-switch/, Blank Display Problem – Screen Disappeared, Honeywell Heat Pump Thermostat Troubleshooting, How Can I Tell 1 or 2 Transformers for Heating Cooling System, How to Wire an Air Conditioner for Control – 5 Wires, Thermostat Wiring Instructions not Matching New, What Temperature Should I Set My Programmable To, Wiring a Programmable for Geothermal Heat Pump, the most common trouble call by service and repair HVAC companies, about thermostat wire with a resource for more information, the best advice for changing your thermostat, the most common mistakes made by DIY thermostat changers. Finally, the 5 wires likely cover Red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (common could be another color). However, we’ll delve into the world of thermostats on this page, and hopefully, this will help many people. See our detailed instructions below. If it is a 5 ton straight cool air conditioner then it does not have heat. Let's take a look at the G wire. These links will lead to you purchase a product from another company. I have an old wiring diagram of a push button set up. The thermostat will open or close (depending on the model) when a temperature is reached, allowing power to flow through the fan. Externally adjustable fan switch with an activation temperature of 150°-240° F allows you to custom set your fan activation. - Patrick - 1/20/12. They just pass 120-240v in and out. Furthermore, here is a list of possible thermostat wiring combinations beginning with the most common first: This is the most common and covers many central air conditioners with an air handler or gas furnace. Also, connect the white wire from the fan to the black wire from thermostat. In this case, you will need a thermostat that has RC and RH terminals. This is a non-grounded thermostat, so just connect the two new circuit ground wires together. How many wires do I need for a thermost? The black wire would typically be the hot wire. 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? Next, both of the black wires from the relay can be spliced together and ran to your thermostat switch. In addition, the ground wire should attach to the terminal screw in the electrical box. Furthermore, the wires going to the condensing unit are shown in red and white. I can send photos of the boiler and the old thermostat wiring. Connect the black wire from the fan to the red wire from the thermostat. The red or yellow wire operates the air conditioning. Just make double sure that you have killed power to the unit. Do I have to just pick one of the gas settings (low/medium/high) and just use that one? Problems caused by improperly installing a thermostat. It’s hard to get the wire bent at the right angle,and even tightening the screws it doesn’t feel like they are secure. But, in my cat 3 wire (required), there’s also a white neutral wire that as no place for it to be connected in the furnace. You will also need a few relays and understand basic control circuits. Connect line connection to the electric heater thermostat. In some cases, one of those wires may be your common. (Note: this is a gravity furnace – no fan). Importantly, remember to set the new thermostat to this same setting. Thanks so much,,. This means that the fan can operate without the heat or air conditioning running. If you can build it for less than $22 then you have a well stocked junk box. Or Red to the thermostat R terminal which is shared with both the heating and cooling. you need a common wire from the transformer which means you need 18-3 minimum to make work. Basic Control Circuits for HVAC Article (opens in a new window). Have to replace new tstat with old one in the summer in order to get the A/C to shut off. The first thing you should do before changing the thermostat is to select the proper thermostat for your system. Cut another piece of the 10-gauge wire long enough to go to the fan. We help you learn more about their system as a whole. If it is digital it has battery power to power the thermostat. If you are replacing a mechanical thermostat with a digital thermostat, the digital thermostat should set itself automatically. Connect the thermostat's “load” wires to the wires that run to the heater. This likely a heat only thermostat that is either digital or non-digital. The white wire connects to the W terminal, the yellow wire connects to the Y terminal and the common wire is used with digital thermostats and is usually black or blue. The other wire originates from the common side of the transformer. I have an electric fan forced air heater at 2000 watts powered by 240 volt wiring, hot/hot. Finally, the ones that are not successful end up calling a professional in to install a new thermostat. 30 (other red wire) needs constant 12-volt power from the battery. Determine if this is a zoned system? The best are all electronic, but the electromechanical work as well. However, during the process, they touched the wrong wires together and blew the transformer — finally, the transformer powers the HVAC control circuit including the thermostat. some thermostat wire diagrams at the end of the article. When you are sure that it is level, tighten the screws. Additionally, emergency switches do not always function. However, the thermostat will turn on the AC heater or fan automatically hence there’s actually no need to turn on the fan by itself. call a professional. It is possible you could have two different transformers in that system so you would need a thermostat with an RC/RH termination in the thermostat. If these systems are single-zone serving only your space then this will be less complicated. Finally, they go down to the local hardware store and purchase a brand new thermostat. Do you have an air conditioner with a gas furnace? I get calls all the time to replace transformers because the homeowner changed the thermostat and didn’t kill the power. If you do it in the way I am going to show you, you won’t have the ability to turn on the fan by itself. That way the house is at a comfortable temperature when you get out of bed. Khaled. These controls can be very complex. There are so many different variations of this High Performance HVAC will not attempt to describe them here. You can get adjustable temperature switches that operate on 120 volts at Home Depot. And for the thermostat to function properly (only if you have a mechanical non-digital thermostat). Finally, these newer thermostats allow you to have a smart home by offering precise temperature control. In the most basic system, this functionality is provided by use of a fan center relay, and the low voltage wiring to the thermostat now will require a minimum of three wires (for heat only units) and four wires (for heat / cool / fan) for control. The Black Magic electric fan measures 18x16 inches and is 41/4 inches deep, making it the largest electric fan Flex-a-lite provides. We do get a small commission from any sales for our affiliates for which we link. The red and white wire will always be the 24 volt hot through the thermostat. The white would be the neutral wire and the green would be the ground wire. The wire running to the thermostat seams to be from the AC unit not the boiler. We will describe the common type (at least for this region (mid-Atlantic) and if you see that you have the system described you can proceed cautiously at your own risk. A new or improved thermostat can help increase energy efficiency when running your furnace or air conditioner. Thanks. Four electrical wires: If the thermostat is turned all the way to the left, in the off position, it will not signal the heater to turn on. When the thermostat for the third zone is turned up the zone does get heat. This is for control of the heating. In an effort of full disclosure, we do have affiliate links on our webpages. The problem is for me – the 6 wires come from the wall, they are relatively stiff. of where the cables emerge from the top plates. These are the four wires that you need to control the heat, cooling, and the blower or fan. For use with electric baseboards, convectors and fan forced heaters, this thermostat is a practical option. What wires are for cooling on the thermostat? Units on a same thermostat. Grey wire is connected to the thermostat (sending unit) terminal with the blue ring crimp connector provided. Finally, once you have made the thermostat selection you can proceed to the next step. They are pulled through a hole in the backplate, then each is supposed to be inserted horizontally into its respective terminal. C) The fan control is a small 24vAC relay that can open and close contact       to run a pump or fan that use 120VAC. If they still won't stay in place, tape them to the wall. Insert the screws and screw them only snug tight. That is why I say call the manufacturer or a professional to make sure this won’t (or will) be a problem and find a solution to fix that problem. 3-Wire Thermostat Wiring; This is common for a digital thermostat that controls a boiler. and off at 165°F. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. Or Red to the thermostat R terminal which is shared with both the heating and cooling. Only thermostat like that that comes to mind is the old Honeywell T-87. Two wires coming from wall, replaced bi-metal type tstat with digital programmable. Sometimes you will have extra wires that are not connected. Required fields are marked *. How to wire a thermostat. Use the hammer and staples to secure the cable to the joists at 12 inch intervals. Find the feeder wires and strip about 3/4 inch of the insulation from the wires. Competency is important especially in a matter such as this. The following are the common wiring colors. Connect the black colored wire to the line side of the electric thermostat. (and more about thermostats, thermostat wire, and installing a new thermostat). A toggle switch can be wired into the system to manually override the cycling of the fan. Red – Now, there can be two separate wires for this. They hooked everything up correctly. Reply: Patrick, typically the three wire thermostat hookups would be … A line-voltage thermostat is for a simple heater or cooler, and it has only one function: to turn the device on and off. If you have a C wire, place it into the C terminal on your wall plate. In the same room, there is a perimeter heater (hot water) which is controlled by its own thermostat (the thermostat controls the modulating valve on the perimeter heater). AC split or package system with gas, oil, or electric heat. Using the color code of the thermostat wires, attach each wire to their proper terminal. Of course W1 would be low, W2 would be medium, and W3 would be high. and off at 175°F. I will describe the advantages of the programmable thermostat in full detail in a different section below. A very common occurrence with service calls is the complaint that the thermostat isn’t working properly. If any cooling, like an air conditioner, or fan control is required, more wires are needed. The wires are blue,green,white,orange and red. SINGLE STAGE ELECTRIC FAN THERMOSTAT PART # 16735 (Continues on reverse side) KIT CONTENTS QTY. This allows 3 heat settings (Low, Medium, High) with gas control by a Standard Remote control Valve Co. 3 position controller. It was 110 degrees yesterday so it’s not the temp causing the temperamental wiring. See this article for an explanation – https://highperformancehvac.com/honeywell-furnace-fan-limit-control-temperature-switch/. The cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. The problem with the staging thermostat is that W1 would still be energized when W2 calls and your controller may not allow that. How should I wire the new thermostat. The thermostat wiring on … Any products which contain mercury are illegal to sell now. Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead on fan #1. Best Answer Black wire from plug is connected to chassis ground. Sometimes the green wire may also be bare in color. It covers the same control or color features as the 5-Wire thermostat wiring above except for heat only. 87 (red wire) connects to the positive wire on the electric fan. For detailed wiring explanations, see our thermostat wiring colors chart or page. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. This is typically for a thermostat that is battery powered or a heat only digital thermostat. If you need a relay here are a bunch of them from Jameco. Necessary cookies are absolutely essential for the website to function properly. look at this image and see the little holes on the pliers? The controller has 4 wires going to it: 24V direct from Xfmr, +3 wires (one to each position terminal). That is your heat anticipator. When installing an auxiliary fan or simply wiring the factory fan so that the driver can manually turn the fan on and off, make sure the fan is turning in the right direction. Not sure without looking at a wiring diagram of the system. However, if your system doesn’t have a C-Wire, you’ll either need to use batteries, get an external wall plug to supply power or use the G (Green) wire which is usually for the fan, to supply power to the thermostat. Finally, this will keep the wires from falling back into the wall. it is different depending on the age of the furnace. Electric Fan Switch With Thermostat, Adjustable 19824 & more classic Chevy, GM, Ford, Mopar car & truck suspension, brakes, steering, & chassis parts www.performanceonline.com Refer to our pages about heat pump wiring on how to wire a heat pump thermostat or our thermostat wiring color page to see the additional control points for your thermostat. Also how would I go about instaling a thermostat in the greenhouse. Most thermostats have built-in screws, while others snap in place. I have a separate boiler and AC unit. Make sure you buy a high-voltage thermostat designed for electric baseboard heat. Run NM cable from the attic fan thermostat to the attic light. When replacing an older thermostat, you will find some standard wiring. Thermostat Wiring Color Code Table (opens in a new window)Additionally, be aware that thermostats are equipped with heating and cooling anticipators. Please do not throw the old thermostat in the regular waste bin. This is for control of the air conditioning. 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. Approximately 1/16th of an inch on the lip of the anchor will remain to stick out of the hole. If it is the old round that is a mechanical thermostat you cannot purchase them any longer. You could even attach duct work to it to vent more efficiently. Here is an interesting thought--- If you could get an old furnace that is junked you could strip it down and use the fan and the relay that is already built into it. We have many other related articles. You will need: A small straight-slot (or flat head) screwdriver, A utility knife or wire strippers (for small wire), Plastic wall anchors (sometimes provided with the thermostat) good for drywall, A drill with a bit to make the holes for the plastic wall anchors. Likely, you have two control transformers. It was replaced in the condenser rather than the air handler. Thank you in advance. It makes a perfect wire loop to go under the screws and therefore a more secure termination of the wire. A thermostat turns your furnace and air conditioner on or off depending on the temperature in the room and the setting on the thermostat. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. Also, connect the white wire from the fan to the black wire from thermostat. My only last ditch idea, which I’m not crazy about, would be to cut a small square where the backplate goes (currently the round hole is exactly the size of the cord), with the hopes that having more room to push the wire around would help???? It needs a two stage themostat. Do I need to have a C-wire, or “common” wire? Always keep in mind to properly dispose of hazardous materials responsibly. Hello http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&freeText=24%20volt%20relay&search_type=jamecoall. Hey. These split systems include an air conditioner with a gas furnace, oil furnace, or electric furnace. Connect the white wire to the load neutral wire and the green, which … As a last resort you could call a professional. If the temperature keeps falling below the set point then W2 would kick on and the same between W2 and W3. A boiler with an air conditioner? It uses a 40-Amp Electric Relay and Electric Fan Sensor. A toggle switch can be wired into the system to manually override the cycling of the fan. Your Resource for HVAC Thermostat Wiring Information – How to Wire a Thermostat, Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Next, get the new sub-base and compare it to the old one. It should kill any power going to the thermostat. Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. With that combination you describe it is probably best to call a pro. 9 years ago. What wires are for heat on the thermostat? The wire used for heat is typically going to be different for the wire used for cooling. Strip about 3/4 inch of insulation from each conducting wire from both cables in the thermostat box. Wires that fall back into the wall must be fished … Lastly, How to Wire a Thermostat. If your thermostat does not have a Y1 and a Y2 then then you can stage it. Typical colors for such wiring would be green, black and white. It's economical, yet rugged. Here's how I replaced it with a digital thermostat quickly and easily. Additionally, some thermostats do not have screws holding the thermostat to the sub-base. With electric furnaces the heat is provided by heating elements in the system and it is necessary to have the fan running when the elements are energized to dissipate the heat as the elements are producing the heat.