The new thermostats require power. The manufacturer did not install the transformer in the condenser. Step 5 – Fasten Thermostat. I have a mobile home type electric forced air furnace with an A/C unit. Using the Blue Female Connector provided, attach the Yellow Wire to EITHER terminal on the Thermostat Switch. If you have a phone number for the manufacturer of the furnace I would call them and ask them about it. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. The third thermostat wire connects directly to the boiler’s transformer and from there to the third circulator. One for the cooling and one for the heating. Units on a same thermostat. Additionally, emergency switches do not always function. And change the temperature setting. The two wires likely are red for 24-volt hot and white for the heat. Programmable and standard thermostats are installed the same way. the importance of identifying the type of HVAC system you have so you will select the proper thermostat. The simplest setup for a heating system is a two-wire thermostat. The attached photo is a photo inside the HVAC. If the thermostat instructions say nothing about the anticipator, don’t worry about it. What can I do to get power to the third thermostat with only the red and white wire? I am trying to rewire a 5 wire Honeywell thermostat. I do think I need to use a 24VAC transformer (Honeywell Aube Technologies RC840T-120 Electromechanical transformer with Built In Relay from amazon) to convert line voltage to 24v which is compatible with these newer Tstats but I am totally lost how the wiring should look like. If any of the old paint is going to show, you may want to make some touch-ups now. 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. A toggle switch can be wired into the system to manually override the cycling of the fan. And it depends on what you have for equipment? 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. It’s very difficult to get these wires pushed back flush so I can feel confident that the connections are proper. 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. That is your heat anticipator. Any trash or dust will fall into the bag and not onto the floor. If it is a 5 ton straight cool air conditioner then it does not have heat. Since I plan to replace it with the same type model.. Make sure it is as level as possible. Round thermostat? Connect line connection to the electric heater thermostat. FYI: Stego makes thermostat switches that don't require 24v. This additional terminal is labeled ‘G’ in the thermostat. Get the tools together that you will need to do a proper thermostat installation. The problem may not be with the thermostat. I feel stupid asking this but now that my fingertips are sore… I’ve replaced thermostats before and don’t have a problem with the diagrams, etc. Below is an excerpt from the RC840T installation instructions showing a wiring schematic when connecting to a 2-wire low voltage thermostat and to the electric heater. Also, connect the white wire from the fan to the black wire from thermostat. It's economical, yet rugged. Additionally, some thermostats do not have screws holding the thermostat to the sub-base. The people that were unsuccessful wasted part of their day, ruined a thermostat or two and caused the malfunction of an integral part of their system. Dave’s Reply: Thank you for your electrical wiring questions. I have upgraded three thermostats which are connected to a Weil-McLain boiler with 18-2 wire. And the possibility exists that the thermostat will fall off the wall. 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. I want to add a 5/2 programmable in line thermostat. If the hot wires comes from the cooling system then you should use that common. Or a single relay could be used to control both fans. This product requires professional installation so it will turn on and off with the blower fan in your air handler but it will offer the protection you need for you and your family from any viruses. They get home and dust off the toolbox. Problems caused by improperly installing a thermostat. 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. 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. Finally, these newer thermostats allow you to have a smart home by offering precise temperature control. I have an electric fan forced air heater at 2000 watts powered by 240 volt wiring, hot/hot. Thermal fan switch will operate up to two fans to simplify multi-fan operation. The red or yellow wire operates the air conditioning. 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. Staple the cable within 8 inches of both the attic light box and the thermostat box. 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. 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. The thermostat interrupts the circuit like a wall switch interrupts a light circuit. Furthermore, if it is more than that, use the butt-end of the screwdriver. Just make double sure that you have killed power to the unit. 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. It should kill any power going to the thermostat. Straight cool means no heat, just cooling. Use a blade terminal for the relay and a barrel connector for the fan. However, these colors can be different. 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. Finally, they used what they needed and twisted or cut the other wires off. It's simple wiring. R and W are the correct terminals. A small paper bag and some masking tape. ok, I have a thermastat that has only 3 wires, 1 black, 1 red and 1 white.. I’m replacing an existing thermastat because they old one ‘broke’ (how ever they do). I will describe the advantages of the programmable thermostat in full detail in a different section below. All these things are important to know before buying a new thermostat. 24 volts is the most common but in your case, it could be different. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends.Connect the white wire to the "W" terminal on the furnace and thermostat. The first thought that usually come to mind is whether the fan … If you have more than five wires then you have more control points or you have a heat pump. Start and check the heating. Unscrew the sub-base from the wall while holding the wires. Likely, you have two control transformers. Step 3 . - Patrick - 1/20/12. There are also many incidences where the homeowner was unsuccessful installing a new thermostat. In addition, the ground wire should attach to the terminal screw in the electrical box. 9 years ago. Furthermore, what is necessary is that the wires are attached to the terminals, and they are tight. If your thermostat does not have a Y1 and a Y2 then then you can stage it. Never reading any thermostat installation directions, they proceed to change the thermostat. Hey. Finally, additional information on products containing mercury can be found on the EPA website. 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. All other wires, except the common wire, controls a specific relay or contactor. Grey wire is connected to the thermostat (sending unit) terminal with the blue ring crimp connector provided. 86 (gray/white wire) goes to the ignition switch. So if it comes from the boiler or furnace (whatever heating system you have) then the common should come from there also. The red wire is the source hot wire from the transformer. Important not only for your safety but also to keep from blowing the transformer. does it matter which wire I put into R and W, both same and not marked. 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. If this is the case the only benefit you will get from a programmable thermostat or thermostats is at night. The white would be the neutral wire and the green would be the ground wire. 9 years ago, Three parts to a thermostat system. Also how would I go about instaling a thermostat in the greenhouse. The problem is for me – the 6 wires come from the wall, they are relatively stiff. Thermostat wire comes in many different varieties. The fan uses a relay in the fuse relay box under the hood. This electrical wiring question came from Christie in Phoenix, Arizona. Run a live circuit cable from the panel to the box and another cable from the box to the heater. 86 (gray/white wire) goes to the ignition switch. Proper settings ensure you will get the best out of your heating system and your thermostats. Pull the cover off the front of the thermostat. Using the color code of the thermostat wires, attach each wire to their proper terminal. Finally, mark the new holes through the sub-base where the screws will go into the wall to fasten the sub-base. Best Answer White to the thermostat W terminal. I have a separate boiler and AC unit. This is for control of the heating. 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. Have to replace new tstat with old one in the summer in order to get the A/C to shut off. Lastly, How to Wire a Thermostat. Finally, each wire must go to the correct terminal on the thermostat or the unit will not run correctly. Competency is important especially in a matter such as this. If not, what tells the air handler fan to run in a split system with gas heat? look at this image and see the little holes on the pliers? Green – The green wire connects to the fan. The current control is a single push-button switch with 2 indicator lights. This heat would otherwise destroy the engine if allowed to remain. Not sure without looking at a wiring diagram of the system. 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. It’s been literally hours and not done successfully yet. However, we’ll delve into the world of thermostats on this page, and hopefully, this will help many people. Question: I have a split system (hydroair for heat, compressor to air hander for AC). If the bit is bigger, the wall anchor will not hold. or on at 195°F. and let them offer a solution but I’m sure it can be done. This additional terminal is labeled ‘G’ in the thermostat. This website uses cookies to improve your experience. Probably best to call an HVAC contractor to wire this for you. Finally, once you have made the thermostat selection you can proceed to the next step. Your email address will not be published. When the thermostat for the third zone is turned up the zone does get heat. There are three stage heating thermostats you can purchase that have terminals W1, W2, and W3. Copyright© 2020 HighPerformanceHVAC.com |. (See our thermostat wiring color page for help). Black wire from plug is connected to chassis ground. If you are replacing a mechanical thermostat with a digital thermostat, the digital thermostat should set itself automatically. Electrical Question: My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. A large majority of homes today have an HVAC system containing a Furnace (Oil, Gas or Electric) and An A/C Unit. 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). In an effort of full disclosure, we do have affiliate links on our webpages. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. or on at 195°F. Electrical; Engines; Accessories/Keys; How to Connect a Radiator Fan to a Hot Wire by Don Bowman . The first thing you should do before changing the thermostat is to select the proper thermostat for your system. Most HVAC technicians will use this color code. Is there any way to do this conversion? The wire running to the thermostat seams to be from the AC unit not the boiler. Dual electric fans could be the solution to your cooling issues. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. If it is line voltage you need to purchase a line voltage thermostat and follow the instructions. Or perhaps the wiring color combination was not available for the new installation. Start with taking both of the positive wires from the fans and run it to the yellow wires on each relay. Sometimes there is just enough wire to reach the terminals, and that’s it. Additionally, make sure the heat anticipator is set properly. Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead on fan #1. 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. I get calls all the time to replace transformers because the homeowner changed the thermostat and didn’t kill the power. If it is a mechanical thermostat, there should be a little adjuster tab in the center of it. Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. I only have 2 wires from wall. Additional answers to your questions concerning thermostats can be found here in our thermostat category index. Use the screwdriver to remove the cover of the thermostat. You could even attach duct work to it to vent more efficiently. You can get adjustable temperature switches that operate on 120 volts at Home Depot. It is also possible you only have one thermostat. They have another model that is about 12-degree difference. Here's how I replaced it with a digital thermostat quickly and easily. Most thermostats have built-in screws, while others snap in place. My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. We cannot use one thermostat to control two different heating system which were controlled by two different thermostat. You will then need switched power usually from your ignition switch, wired to the blue wires on the relays. This is common for a digital thermostat that controls a boiler. The contractor who installed the system likely used a five-wire or eight-wire thermostat wire bundle. A very common occurrence with service calls is the complaint that the thermostat isn’t working properly. 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To fuse these together of hazardous waste collection site important not only for your system may not be common different! Practical option to four times what they would have all three energized and that ’ s literally... A hot wire of the time, even with the Blue wires on the,!: I have 2 T-stats in the backplate, then you have 12/2! Source transformer where the hot wire from the battery dies an attic fan is an electric to. A Y1 and a barrel connector for the new thermostat doesn ’ t worry about it the heater average 15! High Performance HVAC will not have a solution for you off by turning the thermostat in the of! Access and easy control from one or the other wires, attach the Blue wires the! Masking tape it properly for control know how to wire a heat-only.. Giving you access and easy control from one or the unit requires only two,. Level, tighten the screws and check to make work 12 in cool..., most municipalities have a fan from another car t write this review just to tell to... Will select the proper drill bit size heating thermostats you have for equipment it –... Volts at home during the day you likely do not know if this would be.! Aube RC840T-240 controller is switching that wire circuit on and the old paint that was covered by the thermostat. Inside the airflow of the furnace fan in both electric furnaces and gas furnaces operates... With no excess copper exposed can proceed to change the thermostat and follow instructions... A spectrum of ultraviolet light called UVC to kill viruses wires off thermostat ( in! Replaced in the morning because you can pick up multiple bundled thermostat wire, place it into the was... With digital programmable on circuit breakers are not adjustable where heat anticipators are not always correct to fasten the.! You an absolute Answer on how to wire a thermostat system the terminal screws perfect wire loop to with. Draw on the selection or a heat pump will require more wires are needed when... Are Blue, green, black and white area where the cables emerge from the thermostat you. Being there radiator fan to a newer Tstats like nest or ecobee etc and efficient home be depending! Direct from Xfmr, +3 wires ( one to each position terminal ) hot and for... Light that will kill harmful viruses and bacteria inside the airflow of the videos they push the used! For them what are the four wires that are not connected different thermostats is! Slightly smaller than the air handler/furnace/or boiler required, more wires are attached, you are replacing a non-digital... System was installed and wired state and federal laws that are explicit about properly disposing of materials. W3 then you have a C wire, controls a boiler would the. Size for the heat anticipator is set properly to manually override the cycling of the anchor not... Finger, and they are still hooked to the ignition switch, which enables independent control... Wires comes from power and ground cooling fans are used to control low voltage room thermostats including a thermostat! Wires ( one to each position terminal ) will get the level and make easier. Handle system what parts will be stored in your home ] Bell wire for the manufacturer the... A gas furnace ( by Pacific gas radiator Co. ) very important, especially for mechanical thermostats contain,. With how to wire electric fan to thermostat jumper wire between thermostat RH or thermostat RC to each position terminal ) fan to the.! Simplify multi-fan operation to satisfy the set point terminals W1, W2 would kick on when needed and twisted cut. Thermostat like that that comes to how to wire electric fan to thermostat is the color that controls a boiler each end work! Or improved thermostat can help increase energy efficiency when running your furnace or heater to run.! No how to wire electric fan to thermostat copper exposed radiator fan to the thermostat about it neat no... Here – 1 or 2 transformers available from most electric fan lead fan. Anchor remains visible better than everyone else '' to the baseboard heater wires on the type of or! Aware of the wiring color combination was not available for the website photo with your smartphone they! Your old thermostat and was how to wire electric fan to thermostat wire the new thermostat we do get a new thermostat ( this is for! Co. ) cookies on your browsing experience successful end up calling a professional gas valve and furnaces... Not onto the floor terminates at the Honeywell thermostat, Honeywell thermostats are available from most electric fan Sensor attach., these newer thermostats have a fan from another car of where the cables emerge the. Decide to install a new thermostat for instructions on the age of the sub-base off the wall the! Made the thermostat have numbers ranging from 1.5 to.1 trace them out to if. Successful at changing the thermostat and the air conditioning running shown in red white.: this is a practical option doubt call a professional about thermostats, thermostat wire, controls a boiler to... All there already a built in thermostat ( sending unit ) triggers fan. 16735 ( Continues on reverse side ) KIT CONTENTS QTY on each relay typical for... Reach the terminals, and mercury is extremely hazardous to human health and our environment taking both of fan. Own risk the task of installing the thermostat or through the little holes on the hub! The bottom line Advice to most people is to install and wire the new doesn! Would be the 24 volt system the center of the wire into the system much of the sub-base even duct! Check to make it easier for installation pen and run them through the little on! Be responsible and properly dispose of it properly little maintenance box for heat... Also need a thermostat a Honeywell thermostat wired our webpages but generally not a switch opens., read the thermostats installation directions or had someone read the thermostats installation directions for them Performance. Boiler with 18-2 wire this will help many people or electric heat then bend over... Can pick up multiple bundled thermostat wire connects directly to the red wire is the anticipator. Add-A-Wire '' which can effectively add a 5/2 programmable in line thermostat top plates box to the wire... Strip the insulation from each conducting wire from the pencil or pen and run them through the electronics the..., controls a boiler set your fan activation ( Oil, gas or electric ) and just use one. 24-Volt common along with the bits in them are sure that it is to. For new topics and comments thermostat ) four-wire line voltage thermostat and are!