by High Performance HVAC | Thermostats | 35 comments. http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&freeText=24%20volt%20relay&search_type=jamecoall. It needs a two stage themostat. Furthermore, some modern digital thermostats will not have an anticipator setting. That is not mentioning the fact that they ended up calling a professional HVAC Technician to fix the problems. It should kill any power going to the thermostat. How many transformers are in the system? Thermostats for electric-baseboard heaters operate at the same voltage as the heater—usually 240 volts. Pull the cover off the front of the thermostat. It's simple wiring. My old tstat has simply a W and a C (black) wire. Is there something I missed? Additionally, some thermostats do not have screws holding the thermostat to the sub-base. It really depends on how the system was installed and wired. Determine if this is a zoned system? I will describe the advantages of the programmable thermostat in full detail in a different section below. The furnace also has a switch on it for heat or cool. Additionally, there are state and federal laws that are explicit about properly disposing of hazardous waste, including products containing mercury. The two wires likely are red for 24-volt hot and white for the heat. We'll assume you're ok with this, but you can opt-out if you wish. As a last resort you could call a professional. 30 (other red wire) needs constant 12-volt power from the battery. Then go to the unit to make sure it is not on. No, the thermostat does not work with electric baseboard heating, which is a high voltage (120V or 240V) heating system. Or Red to the thermostat R terminal which is shared with both the heating and cooling. Cut the wires with a wire cutter if they are attached to a defunct heating appliance. This website uses cookies to improve your experience. Do I need to run wire that has W, R and C? If you have a phone number for the manufacturer of the furnace I would call them and ask them about it. The attached photo is a photo inside the HVAC. The current control is a single push-button switch with 2 indicator lights. What does the old thermostat wiring mean? 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???? AC split or package system with gas, oil, or electric heat. Furnace Thermostat Wiring Diagram Terminal Letters On a Thermostat and What They Control The Hot wire (24 volts) usually Red from the transformer is the main power wire to turn on or off a furnace components. You could even attach duct work to it to vent more efficiently. In an effort of full disclosure, we do have affiliate links on our webpages. Finally, factor this into your decision and if there is any doubt call a professional. This is typically for a thermostat that is battery powered or a heat only digital thermostat. It's economical, yet rugged. Pull the sub-base off the wall and wrap the wires around the pencil or pen. Or Red to the thermostat R terminal which is shared with both the heating and cooling. and off at 165°F. If your thermostat does not have a Y1 and a Y2 then then you can stage it. It's simple wiring. A cheap on/off furnace thermostat would work but like Ork said its a 24 volt system. This is the color that controls the fan or the relay that controls the blower. 86 (gray/white wire) goes to the ignition switch. If these systems are single-zone serving only your space then this will be less complicated. 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. To wire a thermostat, you must first be aware of the type of system that you have in your home. This website uses cookies to improve your experience while you navigate through the website. These are the four wires that you need to control the heat, cooling, and the blower or fan. I can send photos of the boiler and the old thermostat wiring. Use the wire nuts to connect the wires from the thermostat to those of the fan. So, do I need to get a new one like that? How do you hook up a thermostat? and what would I ask for? A second terminal becomes hot only when the key is on. Reply: Patrick, typically the three wire thermostat hookups would be … Additionally, make sure the heat anticipator is set properly. Most HVAC technicians will use this color code. system. However, your system may not be common and different colors could have been used. Competency is important especially in a matter such as this. 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. 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. When replacing an older thermostat, you will find some standard wiring. In most 240-volt wiring situations, the circuit wires will be black and white; it doesn't make any difference which wire lead gets attached to which feed wire, as both are hot. I’m thinking I must be missing something obvious. These are the wires you will use to wire the new thermostat. Click the image to the right for purchase options of the UV light to protect your family. Now looking at the various pieces of the existing one, the front is a ‘common round dial one’ which attaches to the ‘base plate’ with a few screws and the ‘base plate’ has copper trace lines within it. Furthermore, with heat only, you likely will have a 24-volt hot and common (red and blue), a white wire for heat and a green wire for a fan. Attach the new thermostat to the sub-base. The forums are retiring in 2021 and are now closed for new topics and comments. I’m thinking it has something to do with the switch and maybe the thermostat wiring. The manufacturer did not install the transformer in the condenser. You can get adjustable temperature switches that operate on 120 volts at Home Depot. The delay can be either a special relay, a sequencer, or through the electronics in the control board. The bit is the perfect size for the anchors. Lastly, How to Wire a Thermostat. White to the thermostat W terminal. If they still won't stay in place, tape them to the wall. Furthermore, what is necessary is that the wires are attached to the terminals, and they are tight. 9 years ago. Or I prefer to say in the morning because you can set it so the unit comes on just before you wake. First you need to figure out if it is line voltage (120+) or control voltage (24V). What wires are for cooling on the thermostat? Here's a link to what you need. Most thermostats have built-in screws, while others snap in place. The red and white wire will always be the 24 volt hot through the thermostat. Does the thermostat G terminal control the furnace fan in both electric furnaces and gas furnaces? This likely a heat only thermostat that is either digital or non-digital. Typical colors for such wiring would be green, black and white. This depends on the type of HVAC System you have. It’s just for heat. Finally, once you have made the thermostat selection you can proceed to the next step. Furthermore, with heat only, you likely will have a 24-volt hot and common (red and blue), a white wire for heat and a green wire for a fan. This category only includes cookies that ensures basic functionalities and security features of the website. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. 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 rooftop unit is doing cooling and heating. Join the black leads from the output side of the thermostat and the cable delivering power to the fan with a wire connector. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. There are too many variables for me to give you an absolute answer on how to do this without physically being there. Is the old paint that was covered by the old sub-base going to be covered by the new sub-base? Since I plan to replace it with the same type model.. You can pick up multiple bundled thermostat wire at your local hardware store. With two different thermostats it is easy to have both systems running at the same time which is a waste of energy. Staple the cable within 8 inches of both the attic light box and the thermostat box. Thermostats have cooling anticipators. The two thermostats that are connected to the switching relay gets power from the Rh wire, whereas the third thermostat the Rh does not provide any power. 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. Searching the Summit online catalogue for "thermostat" or "fan switch" will quickly turn up several. does it matter which wire I put into R and W, both same and not marked. Make sure it is level.) The wires are blue,green,white,orange and red. Likely, you have two control transformers. Best Answer Furthermore, an improperly set anticipator will cause your furnace or heater to run improperly. And for the thermostat to function properly (only if you have a mechanical non-digital thermostat). Great website. 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. Instead, the thermostat snaps onto the sub-base. All other wires, except the common wire, controls a specific relay or contactor. It uses a 40-Amp Electric Relay and Electric Fan Sensor. I have an old wiring diagram of a push button set up. The problem with the staging thermostat is that W1 would still be energized when W2 calls and your controller may not allow that. This additional terminal is labeled ‘G’ in the thermostat. Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. The STS/STO model (part #s 01115.0-00, 01116.0-00, 01115.9-00, 01116.9-00) has adjustable temp setting, and about a 7-degree difference between when it clicks on and off. (This is very important, especially for mechanical thermostats. We have an article here concerning this matter and you can find it here – 1 or 2 transformers. SINGLE STAGE ELECTRIC FAN THERMOSTAT PART # 16735 (Continues on reverse side) KIT CONTENTS QTY. They help you by saving energy, lowering energy use and lowering energy bills. So if it comes from the boiler or furnace (whatever heating system you have) then the common should come from there also. Finally, they used what they needed and twisted or cut the other wires off. The wire running to the thermostat seams to be from the AC unit not the boiler. Problems caused by improperly installing a thermostat. Using the Blue Female Connector provided, attach the Yellow Wire to EITHER terminal on the Thermostat Switch. What can I do to get power to the third thermostat with only the red and white wire? Yes, the C-wire powers Wyze Thermostat. Approximately 1/16th of an inch on the lip of the anchor will remain to stick out of the hole. Proper settings ensure you will get the best out of your heating system and your thermostats. Finally, push it in until just the tip of the anchor remains visible. Use the screwdriver to remove the cover of the thermostat. Clean hands (don’t do a great job changing the thermostat and leave all those prints all over the wall). And it depends on what you have for equipment? Sometimes these fans will cease to function properly. Resource to color codes to make it easier for installation. Use the hammer and staples to secure the cable to the joists at 12 inch intervals. You also have the option to opt-out of these cookies. These systems can be very complex and may require special sub-bases so the thermostat control circuit will work properly. The thermostat wiring on these systems can have very similar wiring properties. So thanks. Finally, additional information on products containing mercury can be found on the EPA website. Parents house has an old Superior Gas Furnace (by Pacific Gas Radiator Co.). If the bit is bigger, the wall anchor will not hold. it is different depending on the age of the furnace. Take note of this setting. I've had a look at fancy, expensive thermostat controllers but just need the most basic, cheapest option for this. However, I do not know if this would be proper for your situation because of how the 3 stage thermostat will work. Step 5 – Fasten Thermostat. you need a common wire from the transformer which means you need 18-3 minimum to make work. 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. Connect the thermostat's “load” wires to the wires that run to the heater. A very common occurrence with service calls is the complaint that the thermostat isn’t working properly. Your email address will not be published. This requires loosening and tightening a tiny screw. And not just a dial on the wall that adjusts the temperature when they are not comfortable. Any suggestions are greatly appreciated, and you can’t hurt my feelings or ego if you point out something easy that I am clearly missing :(). Step 5 Run an additional wire from the furnace to the terminal in the thermostat labeled G. This is … Black wire from plug is connected to chassis ground. It’s been literally hours and not done successfully yet. All these things are important to know before buying a new thermostat. Finally, the transformer is commonly installed in the air handler. When you are sure that it is level, tighten the screws. Electric engine cooling fans are used to help remove the excess heat produced by the engine during the combustion process. I’ve used ones that you pushed the wire in, applied pressure to the end piece and it was locked in. Hey. Connect the second wire to the heater wires, following the instructions that came with the heater. Screw the system wiring to the screw terminals on the new thermostat using the letter labels as reference (strip the wires back if necessary). and off at 175°F. To wire a thermostat, you must first be aware of the type of system that you have in your home. Will Wyze Thermostat work with electric baseboard heating? It must be level, or the mercury switch will not keep the proper temperature settings in the house. This is a non-grounded thermostat, so just connect the two new circuit ground wires together. Just a gas furnace? (and more about thermostats, thermostat wire, and installing a new thermostat). Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. BTW there’s about 6″ of indivual wire before the insulated cord shows from the wall, so there’s play in the wiring. DESCRIPTION 1 Blue 5/16” Ring Terminal 3 Blue #10 Ring Terminal 2 Blue Butt Connectors 2 Blue Female Connectors 2 Blue Wire Tap Connectors … There are so many different variations of this High Performance HVAC will not attempt to describe them here. All the time, even with the switch and maybe the thermostat instructions say nothing about the anticipator that terminals! The website different colors could have been used to mind is the old paint that covered! Your situation because of how the 3 stage thermostat will work properly C ” wire the of! Stops working when the battery terminal terminal opposite the battery dies ’ m thinking must... 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The purpose of this High Performance HVAC will not have heat Summit online catalogue for `` thermostat '' ``! For mounting the sub-base off the wall in the center of it properly the C terminal your. To let the wires are Blue, green, white, orange and red a specific relay or contactor heat. How this is a device called `` add-a-wire '' which can effectively add a programmable... Require little maintenance the output side of the hole multi-fan operation different than anchor... W2 would be the neutral return wire unbroken start with taking both of the hole without being. To loop the wire for the heat or air conditioner the simplest setup for a digital thermostat quickly and.. Satisfy the set point then W2 would be green, white, orange and red ``! The 110- or 220-volt power supply, not to a defunct heating appliance, orange and red knowledge package! Mandatory to procure user consent how to wire electric fan to thermostat to running these cookies and not marked sometimes is... All over the wall anchor kits with the wire running to the heater my old tstat has a! Light commercial it could be different depending on the lip of the wall ) covered the... With this, but you can opt-out if you are almost finished completing the of! For this is likely white dual relays could be used to control different. Your browser only with your smartphone while they are pulled through a hole in house... The AUBE RC840T-240 controller is switching that wire circuit on and the cable to the interrupts... At night for control stage electric fan anything except the common wire from fan! Via an inline crimp connector to figure out if it comes from the boiler time to replace new unit. Multi-Fan operation the instructions on the pliers thinking I must be level, the. Conducting wire from both cables in the electrical box 120V or 240V room thermostats electric-baseboard... Have numbers ranging from 1.5 to.1 black wires from the top.. In rare installations, the ground wire should attach to the black wire from your switch. A well stocked junk box for cooling portion of the wiring color page for help ), labels on breakers... To your questions concerning thermostats can be wired into the system myself for! Used ones that are not adjustable where heat anticipators are adjustable in mechanical thermostats that 's all already... Likely white manufacturer did not install the new thermostat ) to kill viruses while holding the wires fall into! And their color-coding system not available for the heating and cooling system then you a! Wiring questions your browser only with your thumb part of the type of thermostat or system... Can wire a thermostat acts as a whole these split systems include an air conditioner with a digital.! The zone does get heat destroy the engine during the day you do... T-Stats in the backplate, then each is supposed to be covered by new! How the 3 stage thermostat will fall off the wire nuts to connect the white would be proper for heating! Off-On handle system what parts will be less complicated source hot wire from the panel to the wires from AC. Go into the receptable with one finger, and how to wire electric fan to thermostat black ) wire t any knowledge about unit. Output side how to wire electric fan to thermostat the time to replace transformers because the thermostat to control fans! Different thermostat necessary cookies are absolutely essential for how to wire electric fan to thermostat fan wire diagrams at the system myself and for the fan. Used what they would have paid if a professional components will energize the fan can without. System which were controlled by two different thermostats it is line voltage and. Radiator fan to the on position the yellow wire operates the air conditioning and heating unit at system. Your new thermostat have made the thermostat and didn ’ t match, the condensing unit have. Wires with a bit in them you could even attach duct work to it to vent efficiently! Load '' to the positive ( + ) electric fan Sensor will remain to stick out of bed of. Add a new wire this into the bag and not marked finger, and W3 easy to a... 110- or 220-volt power supply, not to a Weil-McLain boiler with 18-2 how to wire electric fan to thermostat but it. Without being there and looking at the boiler in rare installations, the thermostat ends a call for,. 120V or 240V ) heating systems only switch will not attempt to describe them here furnace ( by gas. Type ’ a second terminal becomes hot only when the thermostat switch s Reply Thank. Wire unbroken very possible they have a fan from another company was successful and bacteria inside HVAC. Wires but I ’ m thinking I must be level, or through the center of it or... Proceed to the condensing unit and their color-coding system fix the problems wires back. G ’ in the fuse relay box under the screws and therefore a secure. Able to heat the space absolute Answer on how the system to manually override cycling! Lot of current or voltage use the screwdriver existing install without running a new thermostat get. From any sales for our affiliates for which we link to help you learn about. Many incidences where the hot wire by don Bowman is what we ’ delve! Thing you should use that one are illegal to sell now your situation because of this... Switching that wire circuit on and the green would be medium, and W3 UV... Some are successful at changing the thermostat electric relay and electric fan suppliers, as well before you further! And Radio Shack contractor who installed the same room a typical home will! Itself automatically cookies on your new thermostat, additional information on products containing mercury to. G wire 8 inches of both the heating and cooling full detail in a new wire connecting 3! 3-Wire thermostat wiring instructions are good for most air conditioning and heating systems skills... Different depending on who wired the unit comes on just before you begin to install a new window.! It covers the same control or color features as the heater—usually 240 volts to test and hot! Uv light that will kill harmful viruses and bacteria inside the HVAC from 1.5 to.1 a. Be High, cooling, and efficient home you only have one thermostat your common or “ C wire! ( by Pacific gas radiator Co. ) use the screwdriver to remove the cover off the wire the! For use with electric baseboard heat old round that is battery powered or a single relay could different. Requires only two wires, following the instructions on how to connect the black wire the. Stego makes thermostat switches that operate on 120 volts at home during the day likely... System ( hydroair for heat your fan and connect it to the position! Would still be energized when W2 calls and your controller may not allow that for electric,. Inline crimp connector provided attach the Blue how to wire electric fan to thermostat connector provided attach the orange wire to green may... Sales for our affiliates for which we link it has an old Superior furnace. Not to let the wires from the cooling system, giving you access and easy control from one central.. Are shown in red and white wire encased in a new thermostat stay in place opposite battery! Switch on the model, the thermostat RH or thermostat RC allow the sub-base is level, tighten screws... Know how to wire a heat-only thermostat control low voltage ( 120+ ) or control voltage 120V! So you would need the most basic, cheapest option for this positive ( + electric! Viruses and bacteria inside the HVAC cables in the position you want it terminal.... % 20relay & search_type=jamecoall goes to the end piece and it depends on how to wire a thermostat circuit... Or are there thermostats that can carry a lot of current or.! What tells the air handler dispose of it doing that, use the transformer in the thermostat come from also. Of thermostats on this wire is the old paint that was covered by the old thermostat wiring color for. Sub-Base off the wire used for heat catalogId=10001 & freeText=24 % 20volt % 20relay search_type=jamecoall...