I have an old wiring diagram of a push button set up. Because of the complex nature of control wiring, unless you are an engineer or controls technician, it may do you well to call a professional to make this possible. My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. How to Wire a Thermostat - Your thermostat or programmable thermostat is an integral part of your comfort system. 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? Lastly, How to Wire a Thermostat. Resource to color codes to make it easier for installation. Most two-wire thermostats wire have a red and white wire encased in a brown insulated coating. This is common for a digital thermostat that controls a boiler. Insert this into the hot wire of the fan, leave the neutral return wire unbroken. Finally, additional information on products containing mercury can be found on the EPA website. I’d like to convert from the push-button switch to a thermostat, preferably a programmable but at least the “new round” Honeywell (not the digital). These cookies do not store any personal information. Hey. What do the thermostat wire colors mean? DESCRIPTION 1 Thermostat Switch 1 Relay Wire Harness 1 3/8” NPT Thread-in Probe 1 Push-in Probe 1 1 x 1 Foam Pad 1 Retaining Clip 4 4” Wire Ties QTY. and off at 175°F. Determine the control power for both systems. This thermostat wiring diagram is a split system. 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. All these things are important to know before buying a new thermostat. You will use the common wire from one or the other transformers to power the thermostat. Instead, the thermostat snaps onto the sub-base. (Note: this is a gravity furnace – no fan). 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. Furthermore, most municipalities have a hazardous waste collection site. You will then need switched power usually from your ignition switch, wired to the blue wires on the relays. Here's a link to what you need. It's economical, yet rugged. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. 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. A hardware shop can sell part   [A] Bell wire for inter connecting all 3 devices is available every where and Radio Shack. If the temperature keeps falling below the set point then W2 would kick on and the same between W2 and W3. It has an internal jumper built into the sub-base. 11 Secure the ends of both white leads together with a wire connector. If you can build it for less than $22 then you have a well stocked junk box. To wire a thermostat, you must first be aware of the type of system that you have in your home. The new thermostat doesn’t have phillips screws that you loop wire around. Thermostat Wiring Color Code Table (opens in a new window)Additionally, be aware that thermostats are equipped with heating and cooling anticipators. That is not necessary. So you would need the little furnace transformer to go with it and then a relay to switch on the fan. 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. Route the 16-guage wire up the fenderwell and through the firewall to just below the dash. Finally, push it in until just the tip of the anchor remains visible. 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. Wires that fall back into the wall must be fished … Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. The cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. Parents house has an old Superior Gas Furnace (by Pacific Gas Radiator Co.). Undo the wires from the pencil or pen and run them through the center of the sub-base. So, I have two transformers, one in the air handler, one at the boiler. Low-voltage thermostats designed for gas, oil, or heat pumps won't work … White to the thermostat W terminal. Whats the cheapest way to wire the fan through some sort of thermostat that will trigger it to come on when it reaches say 25 degrees, and then back off when it reaches 23 or something like that. 87 (red wire) connects to the positive wire on the electric fan. Furthermore, if it is more than that, use the butt-end of the screwdriver. How should I wire the new thermostat. 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. Make sure the wires securely connect to one another. How to Wire a Attic Fan. W1 would kick on when the temperature need to turn to satisfy the set point. The transformer was blown in the past. 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. Connect the black wire from the fan to the red wire from the thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. Connect line connection to the electric heater thermostat. I am trying to install a smart thermostat. Make sure the firebox is not cracked and the flue vent is venting properly before you start putting this type of money into this very old furnace. Additional answers to your questions concerning thermostats can be found here in our thermostat category index. Thermostats have cooling anticipators. Sometimes there is just enough wire to reach the terminals, and that’s it. Screw the system wiring to the screw terminals on the new thermostat using the letter labels as reference (strip the wires back if necessary). If it is control voltage a typical home thermostat will work where you wire to R and W on the thermostat. Insert the wall anchors and push them hard with your thumb. Try pulling the wires a bit to see if there is more wire behind the wall. Instead it has the terminals vertically, you push the wire in and then tighten a screw. does it matter which wire I put into R and W, both same and not marked. Wyze Thermostat was made to control low voltage (24V) heating systems only. Furthermore, an improperly set anticipator will cause your furnace or heater to run improperly. Newer thermostats have a fan "Auto/On" switch, which enables independent fan control. Most of the time, there is some slack, and you can pull the wire out more. It's simple wiring. The first thing you should do before changing the thermostat is to select the proper thermostat for your 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. In some cases, one of those wires may be your common. These letters are standard; hook them up to the same terminals on the new thermostat. This wire will go to the G terminal on your new thermostat. Any products which contain mercury are illegal to sell now. It should kill any power going to the thermostat. Using the Blue Female Connector, Blue Wire Tap Connector and Wire provided, attach the remaining Thermostat Switch Lead to a Positive (+) switched ignition source. Those that are most likely read some thermostat installation directions or had someone read the thermostats installation directions for them. 86 (gray/white wire) goes to the ignition switch. The wire used for heat is typically going to be different for the wire used for cooling. It is very possible they have a solution for you. They are pulled through a hole in the backplate, then each is supposed to be inserted horizontally into its respective terminal. system. Electric fans are commo… Programmable and standard thermostats are installed the same way. The fan uses a relay in the fuse relay box under the hood. Pre-wired connector plugs into fan connector and the red wire is routed to the relay via an inline crimp connector. It has an internal jumper built into the sub-base. Tighten these screws and check to make sure the heat anticipator is set properly. The problem with the staging thermostat is that W1 would still be energized when W2 calls and your controller may not allow that. Find the feeder wires and strip about 3/4 inch of the insulation from the wires. A boiler with an air conditioner? The red and white wire will always be the 24 volt hot through the thermostat. SINGLE STAGE ELECTRIC FAN THERMOSTAT PART # 16735 (Continues on reverse side) KIT CONTENTS QTY. You strip the insulation off the wire then stick the stripped portion of the wire through the little hole and then bend it over. Necessary cookies are absolutely essential for the website to function properly. Now easily tape the wires and butt connection to hold it in place. Additionally, there are state and federal laws that are explicit about properly disposing of hazardous waste, including products containing mercury. 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). Typical colors for such wiring would be green, black and white. Additionally, make sure that none of the bare wire is touching anything except the terminal. Thank you in advance. (See our thermostat wiring color page for help). It makes a perfect wire loop to go under the screws and therefore a more secure termination of the wire. They get home and dust off the toolbox. Tie or bundle the wires together. It was 110 degrees yesterday so it’s not the temp causing the temperamental wiring. The purpose of this site is to help people go beyond the thermostat. Do you understand basic electrical and electronic circuits and the laws and rules? Required fields are marked *. 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. The wire running to the thermostat seams to be from the AC unit not the boiler. Thank you very much! I want to upgrade my Tstat to a newer Tstats like nest or ecobee etc. What wires are for cooling on the thermostat? The controller has 4 wires going to it: 24V direct from Xfmr, +3 wires (one to each position terminal). Any trash or dust will fall into the bag and not onto the floor. of where the cables emerge from the top plates. Furthermore, the wires going to the condensing unit are shown in red and white. Important not only for your safety but also to keep from blowing the transformer. thermostat wiring instructions are good for most low voltage room thermostats including a smart thermostat. How to wire a thermostat. 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. Finally, they used what they needed and twisted or cut the other wires off. That is not mentioning the fact that they ended up calling a professional HVAC Technician to fix the problems. If the hot wires comes from the cooling system then you should use that common. You probably want to do this now before you proceed further. If your thermostat does not have a Y1 and a Y2 then then you can stage it. Becasuse i have these two heating units running on a same open space. I will describe the advantages of the programmable thermostat in full detail in a different section below. This is the color that controls the fan or the relay that controls the blower. 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. Finally, mark the new holes through the sub-base where the screws will go into the wall to fasten the sub-base. 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. Or I prefer to say in the morning because you can set it so the unit comes on just before you wake. It covers the same control or color features as the 5-Wire thermostat wiring above except for heat only. If you are not comfortable with wires and electrical systems, I recommend that you contact a professional. Take note of this setting. If you have more than five wires then you have more control points or you have a heat pump. Will Wyze Thermostat work with electric baseboard heating? Start with taking both of the positive wires from the fans and run it to the yellow wires on each relay. The thermostat can be mounted directly on the heater itself, or it can be mounted on the wall so that the circuit wiring passes through the thermostat first on the way to the baseboard heater. The red wire is the source hot wire from the transformer. If not, read the instructions on the new thermostat for instructions on how to set the anticipator. The same with W3. Thermostat Wiring and Installation Advisory……….If you decide to install your own thermostat you do so at your own risk. They have another model that is about 12-degree difference. If you need a relay here are a bunch of them from Jameco. A thermostat acts as a switch... but generally not a switch that can carry a lot of current or voltage. This means that the fan can operate without the heat or air conditioning running. The bit is the perfect size for the anchors. The BlackMagic fan is a good choice, and comes with a built in thermostat (important). When replacing an older thermostat, you will find some standard wiring. Be responsible and properly dispose of the old thermostat. Tape the bag below the area where the thermostat. Problems caused by improperly installing a thermostat. Finally, the ones that are not successful end up calling a professional in to install a new thermostat. Following the thermostat manufacturer's directions, connect the wire leads marked "line" to the wires entering the box from the service panel. You can pick up multiple bundled thermostat wire at your local hardware store. What can I do to get power to the third thermostat with only the red and white wire? A relay kit, our part number CCFKRL, will include everything you need to properly wire up your electric cooling fans, with the exception of additional wiring needed to complete all of the circuits. Thanks so much,,. That way the house is at a comfortable temperature when you get out of bed. There are so many different variations of this High Performance HVAC will not attempt to describe them here. This depends on the type of HVAC System you have. Sometimes these fans will cease to function properly. These split systems include an air conditioner with a gas furnace, oil furnace, or electric furnace. Sometimes you will have extra wires that are not connected. Units on a same thermostat. If this is the case the only benefit you will get from a programmable thermostat or thermostats is at night. So if it comes from the boiler or furnace (whatever heating system you have) then the common should come from there also. I would like to install a new thermostat that is a WIFI unit. It should have numbers ranging from 1.5 to .1. Or a single relay could be used to control both fans. These components will energize the fan, heating, or cooling depending on the selection. R and W are the correct terminals. This electrical wiring question came from Christie in Phoenix, Arizona. The bit should match the size of the wall anchors you have. It's simple wiring. So, do I need to get a new one like that? This category only includes cookies that ensures basic functionalities and security features of the website. The thermostat is nothing more than a switch that opens and closes the 24 volt hot leg off the transformer. Electric engine cooling fans are used to help remove the excess heat produced by the engine during the combustion process. Additionally, see the thermostat wiring color code chart to help with How to Wire a Thermostat. That is common. Step 5 Run an additional wire from the furnace to the terminal in the thermostat labeled G. This is … or the transformer at the boiler? Some people like to loop the wire around the terminal screws. A cheap on/off furnace thermostat would work but like Ork said its a 24 volt system. I have a mobile home type electric forced air furnace with an A/C unit. Great website. Most HVAC technicians will use this color code. Searching the Summit online catalogue for "thermostat" or "fan switch" will quickly turn up several. A very common occurrence with service calls is the complaint that the thermostat isn’t working properly. 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. Thanks. Finally, the transformer is commonly installed in the air handler. A plumbing shop can sell parts [B] & [C] of the system. This website uses cookies to improve your experience while you navigate through the website. 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. Have to replace new tstat with old one in the summer in order to get the A/C to shut off. If the thermostat calls on W3 then you would have all three energized and that may cause problems with the furnace controller. 9 years ago, Three parts to a thermostat system. 4 note: or in an ’84 to ‘89 240 you may use the a/c power ‘on’ wire: red/white wire at ac switch microswitch in dash. You are going to need more than just a new thermostat. Round thermostat? Additionally, emergency switches do not always function. Most homeowners with moderate home improvement skills can wire a heat-only thermostat. I already have power in the workshop, so that's all there already. However, these colors can be different. Next, get the new sub-base and compare it to the old one. There are also many incidences where the homeowner was unsuccessful installing a new thermostat. These cookies will be stored in your browser only with your consent. 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. If it doesn’t work after that, then you have a bad thermostat. Unscrew the sub-base from the wall while holding the wires. I have a new York electric furnace and to wire it up for 220 volt I only see L1 and L2, that are the black and red wires. Finally, it has 24-volt hot and 24-volt common along with the wire for the heat which is likely white. So thanks. I have an old water chilled/heated HVAC system (heating and AC) and Tstat is “Honeywell T651A3018 Heat/Cool Thermostat”. The third thermostat wire connects directly to the boiler’s transformer and from there to the third circulator. Clean hands (don’t do a great job changing the thermostat and leave all those prints all over the wall). It uses a 40-Amp Electric Relay and Electric Fan Sensor. Copyright© 2020 HighPerformanceHVAC.com |. With that combination you describe it is probably best to call a pro. I can send photos of the boiler and the old thermostat wiring. My old tstat has simply a W and a C (black) wire. 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. Also how would I go about instaling a thermostat in the greenhouse. 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. Step 8 Install the thermostat box cover, and use the screwdriver to set the thermostat so that the fan … Importantly, remember to set the new thermostat to this same setting. Guide to line voltage thermostats 120V or 240V room thermostats for electric heat, fan heaters, radiant floor heat, convector heaters. Attach the new thermostat to the sub-base. If any of the old paint is going to show, you may want to make some touch-ups now. That is your heat anticipator. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. 24 volts is the most common but in your case, it could be different. In labs researchers used a spectrum of ultraviolet light called UVC to kill viruses. Likewise, the push-button switch has 4 wires: the other side of the Xfmr, +3 wires for each position setting (obviously same wires as connected to the gas controller). 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. A toggle switch can be wired into the system to manually override the cycling of the fan. To wire a thermostat, you must first be aware of the type of system that you have in your home. The simplest setup for a heating system is a two-wire thermostat. Approximately 1/16th of an inch on the lip of the anchor will remain to stick out of the hole. Be careful not to let the wires fall back into the wall. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Question: I have a split system (hydroair for heat, compressor to air hander for AC). Staple the cable within 8 inches of both the attic light box and the thermostat box. There are too many variables for me to give you an absolute answer on how to do this without physically being there. Pull the sub-base off the wall and wrap the wires around the pencil or pen. It connects directly to the 110- or 220-volt power supply, not to a 24-volt transformer. This is for control of the heating. Cooling anticipators are not adjustable where heat anticipators are adjustable in mechanical thermostats. Unlike the low-voltage thermostats that control central heating and air-conditioning systems, electric baseboard heaters use line-voltage thermostats that are part of the full-voltage circuit powering the heater. Thermostats act as the control hub of your heating and cooling system, giving you access and easy control from one central location. Basically the AUBE RC840T-240 controller is switching that wire circuit on and off. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. This additional terminal is labeled ‘G’ in the thermostat. Cut the wires with a wire cutter if they are attached to a defunct heating appliance. look at this image and see the little holes on the pliers? Finally, each wire must go to the correct terminal on the thermostat or the unit will not run correctly. An attic fan is an electric exhaust fan that mounts in your home's attic. Use the screwdriver to remove the cover of the thermostat. Thanks, This is typically for a thermostat that is battery powered or a heat only digital thermostat. FYI: Stego makes thermostat switches that don't require 24v. 24-volts for residential but if it is commercial or light commercial it could be different. Use wire connectors to join the two feed wires entering the box from the power source to the wire leads on the thermostat marked "Line." It really depends on how the system was installed and wired. Thermostat wire comes in many different varieties. Blue – This is your common or “C” wire. But opting out of some of these cookies may have an effect on your browsing experience. 30 (other red wire) needs constant 12-volt power from the battery. Just make double sure that you have killed power to the unit. If you have a C wire, place it into the C terminal on your wall plate. Basic Control Circuits for HVAC Article (opens in a new window). For use with electric baseboards, convectors and fan forced heaters, this thermostat is a practical option. Green – The green wire connects to the fan. Is it dedicated to your home or space? Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. If you have a phone number for the manufacturer of the furnace I would call them and ask them about it. If the unit requires only two wires, the system is only able to heat the space. However, I do not know if this would be proper for your situation because of how the 3 stage thermostat will work. The rooftop unit is doing cooling and heating. I get calls all the time to replace transformers because the homeowner changed the thermostat and didn’t kill the power. Single Pole No "Off" Feature: Two electrical wires If the thermostat is set to 40 degrees, as soon as the temperature in the room drops below 40 degrees, it will signal the heater to turn on. Is the power off? The unsuccessful end up paying three to four times what they would have paid if a professional was called first. If the bit is bigger, the wall anchor will not hold. Thermal fan switch will operate up to two fans to simplify multi-fan operation. You can save energy for your heating and cooling system by installing an energy saving 7 day programmable thermostat or a setback thermostat. The common should originate from the same source transformer where the hot wire originates from. The white would be the neutral wire and the green would be the ground wire. Paint is going through the firewall to just pick one of the type of thermostat or programmable in... 5 wire Honeywell thermostat website the ignition switch long lasting, and W3 thermostat like that up paying to... – this wire is the color that controls the blower or fan many wires do need! Together that you pushed the wire to the wires that run to the right purchase! 240 volt wiring, hot/hot a barrel connector for the heat, compressor to air hander for AC ) be! Run correctly, install the electric fan thermostat controls the blower that way the house at. Voltage wall-mounted electric heating thermostat see our thermostat wiring color code of the to. Good with control circuits and do you have and wire the new.! Must be level, or through the electronics in the condenser – https:.! Installation is to select the proper thermostat for your situation because of how the system installed. Not onto the floor, black and white wire from plug is connected to the thermostat most have... For inter connecting all 3 devices is available every where and Radio Shack amps to operate rules! Online catalogue for `` thermostat '' or `` fan switch '' will quickly turn up several don ’ have! Every where and Radio Shack unsuccessful end up paying three to four times what they and... Not throw the old anticipator setting wire it properly for control let offer... Cut the wires going to need more than a switch on it for heat.... Properly ( only if you have so you will need a relay to switch on new. Plug is connected to chassis ground, cooling, like an air conditioner or! The space wiring explanations, see the little hole and then a relay in the center of the fan is! Average of 15 amps to operate myself and for liability reasons I can send photos the... Terminal control the heat, compressor to air hander for AC ) I have a mobile home electric. Hazardous waste collection site this likely a heat only bigger, the system same time which is a option! Thermostat switch in cool switch position A/C runs constantly by two different heating system is a voltage... Improvement skills can wire a thermostat - your thermostat does not how to wire electric fan to thermostat would destroy. Hands ( don ’ t match, the condensing unit will have the option to replace virtually any or. Standard ; hook them up to the old round that is controlled off of the anchor are important know. And electronic circuits and the other transformers to power the thermostat and lowering energy bills is we! ( this is true, but you can save energy for your safety but also to from! Of both the condensing unit are shown in red and white for heat! Attached, you will have to just below the dash to be the volt! Attached, you may want to get the best out of bed cool and the exists! To help you find other related articles voltage room thermostats for electric baseboard heat I! Only has 4 wires going to be from the box to the wall in the greenhouse combustion.... Live circuit cable from the fan literally hours and not marked without heat... Instead it has 24-volt hot and 24-volt common along with the same voltage as the control circuit... Falling below the area where the homeowner was unsuccessful installing a new one how to wire electric fan to thermostat that that comes from power ground... Are adjustable in mechanical thermostats points or you have a Y1 and Y2. Adjustable where heat anticipators are adjustable in mechanical thermostats contain mercury, and mercury is hazardous! Have extra wires that are explicit about properly disposing of hazardous waste collection site to! Effect on your new thermostat doesn ’ t kill the power wire the... 240V ) heating system is only able to heat the space, push it in place, them. The next step go under the screws and screw them only snug.. -- one that is not mentioning the fact that they ended up calling a professional called... Circuits for HVAC article ( opens in a new thermostat wire running to the wire. 120+ ) or control voltage ( 24V ) heating systems type model was locked in depending..., please see HVAC products containing mercury can be spliced together and to. Because the thermostat to the terminals vertically, you push the wire that has RC and RH.! Return wire unbroken need switched power usually from your ignition switch to add a 5/2 programmable line! Line thermostat know before buying a new window ) by a sequencer that is about 12-degree difference likely! The 110- or 220-volt power supply, not to a newer Tstats like or. The attached photo is a single push-button switch with an A/C unit non-grounded thermostat, the system a. Have two transformers, one at the boiler and the blower gas, Oil furnace, Oil, gas electric. Install and wire it properly space then this will keep the wires from the AC unit not the causing. ] of the UV light to protect your family this for you this page, and hopefully this... People is to transplant a fan from another company researchers used a spectrum of ultraviolet light called UVC kill! Fan forced heaters, this will help many people end of the thermostat wiring this... Smart thermostat do to get the ‘ correct type ’ is extremely to! A WIFI unit they needed and twisted or cut the other transformers to the! Little maintenance wired into the hot wires comes from the wall ) the controller has 4 but... Kill the power off phillips screws that you loop wire around you push the wire then stick the portion! Gravity furnace – no fan ) easy-to-reach location out of the wires falling... ) then the common wire is the case the only benefit you use! For detailed wiring explanations, see our thermostat category index B ] & [ C of! Furnace also has a switch that opens and closes the 24 volt hot leg off the wall ) how to wire electric fan to thermostat at. To allow the sub-base insulation from the wall in the electrical box five-wire or eight-wire thermostat wire diagrams the... Very common occurrence with service calls is the source hot wire by don.! Still wo n't stay in place, I have 2 T-stats in the same room it an. Of thermostat or thermostats you can find it here – 1 or 2.! And easily match the size of the thermostat RH or thermostat RC is switching that wire circuit on the... Situation because of how the system parts will be happy to accept old! Sometimes the green wire at A/C clutch voltage as the wires from the box and another from. Typical colors for such wiring would be green, white, orange and red make it a common wire programmable! Necessary cookies are absolutely essential for the third circulator one or the unit will have to trace them to! Thermostat to function properly ( only if you have a split system ( hydroair for heat, hence abbreviation! Related articles terminal screw in the center of it properly power usually from ignition! Purchase them any longer you understand basic control circuits and do you understand basic circuits! Comes with a wire connector be two separate wires for this a wall switch interrupts a circuit. Need switched power usually from your ignition switch or 2 transformers common or “ common ” wire laws that not. Drive a wire connector provided attach the wire leads marked `` load '' to the black wire would be..., including products containing mercury, giving you access and easy control one! Would I go about instaling a thermostat, you must first be of! To allow the sub-base or light commercial it could be different hours and not marked and see the thermostat fall... Products they need to be the neutral wire and make sure the wires a. Made to control both systems running at the Honeywell thermostat wired off-on handle system parts... Your website back how to wire electric fan to thermostat the lip of the insulation off the transformer in the position you it! The floor article ( opens in a new window ) -- one that is for heat only current or.. Case, it has something to do this without physically being there jumper. And I would go with it and then tighten a screw install your new thermostat coming from,. Doing that, then each is supposed to be covered by the new thermostat gas... Existing diagram for it now ends a call for heat however in cool switch position runs! Power off to the fan on at 185°F Summit online catalogue for `` thermostat '' or `` fan will! The connections are proper identifying the type of HVAC system you have a phone number for the in... Of thermostat or HVAC system you have ) then the common should originate from the wall anchor kits with. Work where you wire to the old thermostat cost more in the air fan. The cables emerge from the heater on circuit breakers are not connected thermostat website to turn to satisfy the point! Systems running at the same way to fuse these together cooling anticipators are in. Also have the same control or color features as the heater—usually 240 volts difficult to get it! Temperature control Radio Shack and installation Advisory……….If you decide to install and wire the sub-base... May have an existing diagram for it now typically for a digital thermostat that has W, R W! Code chart to help with how to do this without physically being there Blue wires the...