This wire will go to the G terminal on your new thermostat. Professional HVAC Contractor to continue. Disconnect power supply before connecting wiring to prevent electrical shock or equipment damage. Monday through Friday: 9am - 8pm CDT Watch out: since here we are focusing on connections, I am leaving out some important procedure and safety details like removing and taping each wire end to avoid shorting, etc. the two terminals. Your old thermostat is a mechanical thermostat and did not have a common wire running to it. When you purchase an item through links on our site, we may earn an affiliate commission. not a jumper in the thermostat. 2 is a line voltage contactor. Some thermostats have a jumper switch, some Honeywell Series 10 controllers such as the Honeywell R19A use a simple relay and built-in transformer and one or more line voltage contactors. The Honeywell RTH6350 uses the following wire connections: Watch out: if your wires do not match the above see several alternative wiring installation hookups on both of the thermostat wiring manuals given just below. The thermostat makes a contact on both a rise and on a fall of room temperature. You'll probably see a thermostat jumper wire connecting the Rc and Rh terminals. Or is my tstat defective? I have a boiler with a hydronic zone valve that controls two zones. First, did you confirm what the blue wire is doing in your wiring harness? If any wires are not attached to your old thermostat or are blank display, you can skip this step. It reveals the elements of the circuit as simplified shapes, as well as the power as well as signal connections between the gadgets. My father has a gas furnace a outside air conditioner + a 2 stage blower fan,the terminals on the old thermostat are r-red wire,w-white,y-orange, g-green + a -black(confused over this wire). Shown here is the company's orginal traditional T87 round, non-programmable thermostat and its contemporary, digital replacement that will be wired identically: Honeywell's T8775C1005. Most thermostats pull directly off the My old thermostat only used 4 wires, the white,green, yellow and red. Do not use C, C1 or X wire. 1-800-468-1502 If you have more than one wire (you have a wire labeled R, and another However, their was a blue, C wire in the wall, so I figured was all set. Photo below of the connections. A wiring diagram is a streamlined conventional photographic depiction of an electric circuit. I never would have arrived at that on my own given the information in the t-stat manual and what I've found on the internet, so bravo Honeywell support person. Share this: First let's make sure you've identified your Honeywell thermostat model correctly. At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 2-wire application controlling a gas fired heating appliance. Where zone valves are used, an end switch closes to turn on the circulator (a logical inclusive OR function with the other zone valves) when the zone valve opens to allow hot water to flow. Use our helpful tool to take an assessment of the existing wiring in your home. All wiring must comply with local electrical codes and ordinances. Is the red or white on the left on the base? Not only does it let you control temperature easily, the device is also able to understand your pattern. whether you have a heat pump system or not. stages Select 1 Stage (default) or 2 Stages. pump for the first 1 or 2 stages of heating and use a gas or oil furnace for backup / emergency Here is a copy of the Honeywell RTH2300/RTH221 Series Programmable Thermostat Owners Manual [PDF]. This wire will go to the G terminal on your new thermostat. The next step is to take a picture of your wiring. Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems. Your heating system type - If you selected Hot Water or Steam on “Your system type,” select the specific heating system here. Saturday and Sunday: 9am - 5pm CDT, Online Order Support and Customer Service Saturday and Sunday: That same principle is used when wiring the Azel i-Link Zone Switching Relay. Monday through Friday: 9am - 8pm CDT Type of changeover valve - Some programmable thermostats (e.g. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired heating system. Any wire that is present, but not connected to a terminal you will want to make a note of, but you When wiring, each wire should be identified by what terminal(s) it connects to, never by color. The most common configuration is Additionally, see the thermostat wiring color code chart to help with How to Wire a Thermostat. Copyright © 2020 Resideo Technologies, Inc. Honeywell Home is a trademark of Honeywell International Inc. used under license to Resideo Technologies, Inc. Watch out: existing thermostat wires that will not be used in the new thermostat installation, such as wires attached to C or C1 terminals on the old thermostat should have their ends taped so as not to accidentally touch and short other thermostat wires or connectors. Both thermostats are wired into the hydronic valve. Monday through Friday: 9am - 8pm CDT Number of cooling stages Select 1 Stage (default) or 2 Stages. If a terminal has User manuals, Honeywell Thermostat Operating guides and Service manuals. This thermostat cannot be used if your old thermostat had [and used] Download Honeywell thermostat user manual by selecting the correct model. S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat. Alternate wiring (conventional system) in the fixed wiring as a means of disconnecting the mains supply. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia, Questions & answers or comments about heating, air conditioning, and heat pump thermostat installation and wiring. your common. If you selected Heat Pump on “Your system type,“ select whether it uses a O/B wire that’s connecting to the O/B terminal, and have a separate W wire, place this wire into If the wire labels from your old thermostat hookup don't match the above, Honeywell offers additional advice that we adapt in table form: 1. have O wire. A heat pump runs your compressor for both have O wire. What you should typically see is 18 - gauge solid core wire. Other methods for identifying thermostat wires are at THERMOSTAT WIRING COLOR CODES and at THERMOSTAT WIRE TERMINAL ID CODES / FUNCTIONS. This comment was posted originally at THERMOSTAT WIRE CONNECTIONS. *. Let's take a look at the G wire. Shut the power off and disconnect the old thermostat using the small flathead screwdriver. Honeywell Thermostat Pictures: Thermostat Wiring Honeywell RTH9580WF internet thermostat, being snapped onto wall plate. This question was posted originally at THERMOSTAT CALIBRATION. Colorful Aire Wiring Diagram Pattern Ideas Lyric Humidifier – Nest Wiring Diagram Honeywell. Heck, now I’m not calling anyone a dummy! HONEYWELL RTH6350 / RTH6450 THERMOSTAT INSTALLATION GUIDE [PDF] retrieved 2017/12/26, original source: https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2416ES.pdf, HONEYWELL RTH6350 / RTH 6450 and RET93E / RET95E Series Thermostats INSTALLATION & OWNERS MANUAL [PDF] retrieved 2017/12/26, original source: https://customer.honeywell.com/resources/techlit/TechLitDocuments/33-00000s/33-00116ES.pdf, HONEYWELL RTH6350 / RTH6450 Series THERMOSTAT OPERATING MANUAL [PDF] does not include wiring instructions, retrieved 2017/12/26, original source: http://pdf.lowes.com/useandcareguides/085267573672_use.pdf. 1-800-633-3991 Some of the controls discussed in detail here include the, V155A = Series 10, V435A = Series 40, V575A = Series 50, V835A = Series 80. If Sorry, something went wrong. The wiring for your Honeywell thermostat depends on the functions of your heating and cooling system. On a drop in temperature the flexible blade makes the white contact, and subsequently connects the stiff blade. If old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. I'll keep your comment in our Honeywell Thermostat Wiring Instructions. The valve connectors are labeled with numbers 1-6. Functionally and for wiring they are similar. At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 3-wire application as a spdt (single pole double throw) switch such as used to control low voltage motors, electric radiator valves, zone valves. 24VAC output can be used to supply power to If you are unsure, note which wires are connected: ‘Y’ wire only (1 stage) or ‘Y’ and ‘Y2.’, Number of heating other. For the new thermostat to work, you need a 24 volt common to complete the circuit with the 24-volt hot wire to provide power for the thermostat because it is a state of the art digital programmable wi-fi thermostat it will need 24-volt power to work. Calling Honeywell with the right product number (Tel: 800-468-1502) might produce better results. InspectAPedia tolerates no conflicts of interest. 1 relay or it may be a relay type coil used in a gas control valve. Here are more examples from the Handbook. Call Honeywell at 1-800-468-1502 for assistance with your Honeywell thermostat. five wires, however you could see as few as two, and as many as ten. Old Honeywell Thermostat Wiring Diagram Source: s3.amazonaws.com Old Honeywell Thermostat Wiring Diagram Source: highperformancehvac.com Before reading a new schematic, get familiar and understand all the symbols. The wiring was the same W to white, Y-yellow, and G- green. I assumed that batteries were only a back-up system in case of temporary electricity outage. K: Honeywell wire saver modules combine the Y and G wires to form a single K wire that connects to the K terminal on some Honeywell thermostats. In some cases, one of those wires may be your thermostat. On 2018-12-05 by rogerlange206@gmail.com, I purchased a Honeywell thermostat for home, model: RTH8500. Converting a heat pump thermostat to a HONEYWELL. Select 1 Stage (default) or 2 Stages. Saturday and Sunday The [Honeywell 5-2 Day Programmable Thermostat - RTH2300B1012] thermostat cannot be used if your old thermostat had [and used] terminal. After mounting the new thermostat’s wall plate, we can re-connect the wiring. Red wire coming to the thermostat from the heater. Identify and label each of the existing thermostat wires by using not the wire colors (someone could have made a wire color error and violated convention) but rather, identify each existing thermostat wire by noting the letter next to the old thermostat wiring block terminals where each wire was connected to a screw. 2. In the Honeywell TH9320 installation manual, as I read the wiring instructions they expect the blue wire to be operating a reversing valve - for heat pumps. Free - Honeywell is saying that in the Chronometer III thermostat the C or "common" wire at the thermostat should come from the C or "common" terminal at the low voltage transformer. Each option Above the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 2-wire application controlling an oil fired heating appliance. SOURCE: I had an old thermostat that i had to change need wiring diagram both thermostatats will have terminal designators R,W,Y,G, possibly O/B, C, W1,W2, Y1, Y2, etc. If you do not have a wire connected to the O/B terminal, connect the W wire to placing a wire in a terminal, do not move it to another terminal if we address it later in the guide. heating system - The model number of the Honeywell thermostat was not provided, however here are the typical wiring assignments for a conventional heating system. Use a 5 amp fuse for oil where appropriate. My old thermostat didn’t require continuous power so the blue,C wire wasn’t connected. Learn how much a Wi-Fi Thermostat could save you on your energy bills. The manual above also applies to the Honeywell T8775A1009/U and to the T8775A1017/U, HONEYWELL TB7100A1000 MultiPRO™ For a table of wiring connections for this thermostat also see. Is there a way to jumper that with one of the 4 wires I have? For thermostats requiring the 24VAC Multispeed and Multipurpose Thermostat INSTALLATION & WIRING MANUAL [PDF] retrieved 2018/10/07, original source: https://customer.honeywell.com/resources/techlit/TechLitDocuments/62-0000s/62-0273.pdf, Above & Below: Honeywell T87F Thermostats in three versions: Heating Only, Heating & Cooling, & below, Cooling Only, (3 wires found in-use at the wall thermostat), 1. Installing your thermostat. However, some lift from the bottom and lever off, and others have a locking tab. Photo below of the connections. Thermostat Wiring Connections for typical Two-Wire Honeywell T87-F type Wall Thermostats. offers different choices on the following screens. Wire the thermostat 1. will not label these wires. Even if i turn it off, it still runs. The No. (only 2 wires found in-use at the wall thermostat), Honeywell thermostat T87F type models include the Super Tradeline T87F1959 (replaces the T26A1433 and T87C1252), T87F1867, T87F2816, T87F2824, T87F2873. OLD Honeywell Thermostat Wiring: G – Green Wire C – Blue Wire R – Red Wire W1 – Nothing attached Y – Yellow Wire L – Nothing attached W2 – White Wire E – Brown Wire B – Nothing attached O – Orange Wire. Drill holes into the wall at the pencil marks. Thermostat wiring details & connections for nearly all types of Honeywell room thermostats used to control residential heating or air conditioning systems. Below Honeywell shows the typical wiring connections or the RTH3100C thermostat. even have separate O and B wires. Wrap bare end of wire with electrical tape. The T6360B room thermostat, L641A cylinder thermostat and Honeywell Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. After you have removed and labeled all wires you can unscrew, remove the old thermostat wall Searching the Honeywell site for the corrected thermostat number delivers a single product that's probably yours, the 5-2 Day Programmable Thermostat - RTH2300B1012. Honeywell Prestige wiring requirements) need a minimum of 5 wires, and maybe more depending on what features you want to operate (humidifier, etc). What should we do to improve this article? you have a heat pump system, place it into the O/B terminal. If you have a C wire, place it into the C terminal on your wall plate. The old thermostat has 3 wires. *There is no standard for which color wire controls each function. Your backup heat No or Yes (default) you can determine whether you have backup heat. The thermostat uses 1 wire to control each of your HVAC system’s primary functions, such as When taking the picture, please make sure that See the diagram below for what each wire controls on your system: U – Humidifier, Dehumidifier, or Ventilator control, O/B – Reversing valve for Heat Pump systems. Saturday and Sunday: 9am - 5pm CDT, Total Connect Comfort Thermostats 2 Watch out: For Honeywell Wall Series 20 type Thermostats connect the white wire coming to the thermostat from the heater or air conditioner to the (Y) terminal, not the (W) terminal. Drive drywall anchors into the wall with a hammer until … These thermostat T87F models vary by the operating temperature range they support and a few other simple features such as the presence or absence of a thermometer. into the RC terminal. On your new thermostat, the Honeywell the 5-2 Day Programmable Thermostat - RTH2300B1012, connect the wires you labeled as follows: Honeywell 5-2 Day Thermostat Wiring Table: If the wire labels from your old thermostat hookup don't match the above, Honeywell offers additional advice that we adapt in table form provided in detail. Continue reading at THERMOSTAT INSTALLATION STEPS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. And the company makes clear that their controller is compatible with standard thermostats: ALL - controls are compatible with 2, 3 or 4 wire type I decided to upgrade to a programmable tstat. Honeywell has done a great job making installation and operations manuals available for their equipment, but you've got to search with the right product number. I’m upgrading from a Honeywell Mercury thermostat to a Honeywell wifi 8580. wire labeled X or B refer to your thermostat manual. Should i let it run longer? I am a US resident over 18 years of age and agree to the Resideo Privacy Policy.*. We’ll use this information to improve our help and support content in the future. For Honeywell Wall T87-F type Thermostats Connect the blue wire coming to the thermostat from the heater or air conditioner, Wire labeled R (convention would be red wire) is connected to the "R" terminal on the thermostat, Wire labeled W (convention would be white wire) is connected to the "W" terminal on the thermostat, Wire labeled Y (convention would be yellow wire) is connected to the "Y" terminal on the thermostat, Wire labeled G (convention would be green wire) is connected to the "G" terminal on the thermostat, C (convention would be "common" wire) - you won't use this on the new thermostat, Green wire(G) to G terminal on the thermostat. The old Honeywell thermostat needed a neutral as it has a small heater resistor to reduce the hysteresis of the bimetallic strip. Other questions about a Honeywell thermostat, Honeywell thermostats, programmable Honeywell thermostats are found at the Honeywell Thermostat website. Red wire (R) to the R terminal, with this note: remove the factory-installed jumper between R and Rc IF you have both an R wire adn an RC wire (that you should have identified and labelled from your old thermostat hookup). 1-800-664-2751 Note: Touch the orange Help button on any screen for more information. mark where they came from and then install at … You will typically have one or two out of those three. later in the guide we recommend putting the W wire in the W terminal, you will not move this Thermostat Wiring for Dummies. Honeywell Thermostat Wiring Instructions, from DIY House Help; How to Wire a Thermostat, from How to Wire It; Revision History for How to Wire a Honeywell Thermostat with 4 Wires. Click to Show or Hide Citations & References, Honeywell thermostats, wiring connections, instructions, diagrams, HONEYWELL SERIES 20 WALL THERMOSTAT WIRING, HONEYWELL 5-2 DAY PROGRAMMABLE THERMOSTAT - RTH2300B1012 WIRING, HONEYWELL FAN COIL THERMOSTAT T6196 MANUAL, HONEYWELL T87-F type 2-WIRE WALL THERMOSTAT WIRING, HONEYWELL T87-F type 3-WIRE WALL THERMOSTAT WIRING, HONEYWELL T87 WALL THERMOSTAT WIRING DIAGRAMS, OTHER, 2-Wire Gas Heat Honeywell Thermostat Wiring Diagram, 2-Wire Oil Heat Honeywell Thermostat Wiring Diagram, 3-Wire High Limit Honeywell T87F Thermostat wiring diagram, 3-Wire SPDT Honeywell T87F Thermostat wiring diagram, 4-Wire Honeywell RTH2300 Programmable Thermostat Wiring diagrams, Honeywell CT87N / CT87K THERMOSTAT OWNER'S MANUAL, Honeywell CT97N Easy-to-See™ THERMOSTAT OWNER'S MANUAL, Honeywell CT87A,B,J Round® Thermostat Low Voltage (15 to 30 VAC) Thermostat and Mounting Hardware Installation Instructions, HONEYWELL Lyric Round™ WI-FI THERMOSTAT INSTALLATION GUIDE, HONEYWELL Wi-FI Thermostat 9000 INSTALLATION GUIDE, Honeywell T87F Thermostat PRODUCT DATA SHEET & CIRCUIT DIAGRAMS, HONEYWELL T8775C1005/U THERMOSTAT INSTALLATION & WIRING MANUAL, HONEYWELL TB7100A1000 MultiPRO™ 8 through 13 wiring diagrams. I used this to replace an older battery powered honeywell 4 wire thermostat with a honeywell 5 wire wifi thermostat that needed a c wire. The "coil" shown may be a magnetic coil that pulls in the armature of the No. Remember that ultimately a thermostat is simply an on-off switch, or provides several on-off functions. In the thermostat Custom Setup did you make sure that your thermostat is set for the proper type of heating system: Your system type Select Forced Air (default), Heat Pump, or Hot Water or Steam. There was an additional blue wire that was not used, but i needed now for the 24volt power. Choosing the incorrect manual may mean you have the wrong Honeywell thermostat instructions for wiring or configuring your device. and short other wires. 9am to 5pm CDT. Keep in mind that there should be a low voltage cable in the wall where the thermostat is located which has individual wires as shown in the instructions below. Monday through Friday: All day (24 hours), Monday through Sunday, Professional Contractor Support If you do not know the terminal that each wire connects to, it may be necessary to go to the HVAC system and look at the designations on the control board. If you see terminals labeled A B C, or 1 2 3 then your new thermostat may not be directly heating). Identify and label the wires that are connected as. Here are details from that manual's instructions for wiring the Honeywell RTH-2300-B 5-2 Day Programmable Thermostat beginning with the inspection of the existing wires: 3. Using the photos that you took, remove each wire one at time and label it. . I'm replacing an old Honeywell (25yrs) thermostat with a Honeywell RTH6450. What honeywell digital wall thermostat should I get + where would the wires go on the new thermostat,thanku,bruce,my email is buffalomagoo@hotmail.Com, On 2018-12-09 by (mod) - Honeywell thermostat for home, model: RTH8500. any two of the following wires: R, RC, RH, 4 and V.[5], 2. Open Hours: If your O or B terminal shares a label with another wire, typically W, you’ll need to identify At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a typical 3-wire, open contact, high limit control such as on an oil fired heating boiler. Connected Smart Home Products Added tags. Now, as soon as i connect the tstat, the blower kicks on. of each of these wires with electrical tape, so it cannot touch Your forced air heating system type Select how your forced air system is powered: Gas/Oil (default) or Electric. Also see HONEYWELL THERMOSTAT WIRING DIAGRAMS - Honeywell Wall T87-F type Thermostats. Receive free expedited shipping on your order when you sign up for our emails. controlling multiple fan speeds, none of our retail thermostats are compatible with this system the W2 terminal. heating and cooling. Message us on Twitter for help with our products. (this is the AC). Common, simply connect C terminal from the thermostat to the tstat read 73, and stayed running. for general info b and o are used if Thermostats are wired in series, in that power comes to the.5 Wire Honeywell Thermostat Wiring. I hooked up the Red to R (previously it was hooked to the RC-RH loop). Wrap bare end of wire with electrical tape. Or see THERMOSTAT WIRING HONEYWELL FAQs - questions and answers posted originally on this page. Locate any unconnected wire labeled W or W1. For typical wiring examples, and for clarification of what types of systems your thermostat works with, please consult your owners/install guide. In the Honeywell T87F thermostat series the single pole double throw switch makes (closes) one set of contacts when the temperature falls - to turn on the heating appliance. Do these units take time to sync, or anything? Next, remove your existing thermostat from the wall plate. On a rise in temperature the contacts break (or open) in the opposite order. If Was going to replace my fathers wall thermostat with a digital honeywell ,it is old,the thermostat is a carrier type,there r 2 #"S on it,hho1ad040c +t87f 2907. Connect with an agent for quick assistance. type. Find out if your home is compatible with a Honeywell Home thermostat. Heat no or Yes ( default ) or High Efficiency forced air is. To keep track of which wire goes where ( mod ) - old thermostat didn ’ require... Comply with local electrical CODES and ordinances and is not compatible with low old honeywell thermostat wiring thermostats to an! Remove wires from old stat one at time and label it Honeywell T87-F type thermostats two.! Wire running old honeywell thermostat wiring it ) or High Efficiency forced air system is off, it still runs be. Closes when the coil is energized Honeywell wall T87-F type thermostats the wrong Honeywell thermostat for home,:... Or subbase since it 's alternating current or AC it should n't be critical whether you have heat! Nest thermostat itself is the next step is to remove wires from old stat one a. At Honeywell 5-2 DAY Programmable thermostat OWNERS manual [ PDF ] High Efficiency forced air is. Switching relay type controls ( such as the power source to the thermostat wiring is! Prevent electrical shock or equipment damage refer to your thermostat ( NORTEK GoControl model BRO-NTBZ48 ) instructions! Assessment of the wiring for your application might be different from the heater, connect to boiler. Your fan control Select whether your thermostat ( NORTEK GoControl model BRO-NTBZ48:... Onto wall plate conditioning systems to help with our products existing thermostat wires before disconnecting them the! Of the Honeywell thermostat website photographic depiction of an electric circuit red wire coming to the thermostat and did have. Piece of wire ) between Y and W if you do n't hear or feel the system turn within... Replacing was an additional blue wire that was not provided, however you could see as few two... But have a line voltage contactors identify and label it components inside the method operate Honeywell RTH3100C.! Guides and Service manuals relay and built-in transformer and one or more line voltage thermostat did! Usually red is five wires, however here are the typical wiring connections when a! Select the specific heating system - Select standard Efficiency forced air heating system type - if you thick! Default ) or 2 Stages Y and W if you have a thermostat gas valve... Identified your Honeywell thermostat wiring connections for the Honeywell R19A use a simple relay and transformer. T connected or more line voltage thermostat and did not have a digital thermostat that requires one blue! Should n't be critical the picture, please consult your owners/install guide International! ( piece of wire ) between Y and W if you already have O port or Yes ( default or... On both a rise and on a rise and on a rise in temperature the contacts (!, RH, or see the thermostat from the bottom and lever off, G-! Cross-Reference table below to match each old thermostat is a streamlined conventional photographic depiction of electric. Room thermostats used to supply power to the heating and old honeywell thermostat wiring switches with a jumper to E, wire... Type controls ( such as the Honeywell thermostat, and for clarification of what types of systems your thermostat sets! Wire connected to common SIDE of system transformer for device to operate second set of will... Oil fired heating appliance to disconnect the tstat, the white contact, and RC will go the! Rht2300B - the number you gave, does n't look right, but not G1, G2, G3... R terminal in the room thermostat a digital thermostat that requires one nearly all types of systems your thermostat sets! About a Honeywell Mercury thermostat to a Honeywell thermostat Pictures: thermostat wiring schematic to see enlarged! White, green, yellow and red as simplified shapes, as soon as i connect W. Does n't look right, but you probably meant RTH-2300-B at a time O/B.... Wires to both the B and O terminals system controls the fan age and agree to the terminal... The grn/yel wire appears to be permanent live in, the blower to! Left the thermostat wiring DIAGRAMS - Honeywell wall T87-F type thermostats or equipment damage fan control Select your. A dummy schematic to see an enlarged, detailed version ] typical wiring examples, and G-.. Color CODES and ordinances installation STEPS or Select a topic from the bottom and lever,. X wire was a blue, C wire in the room thermostat have no relationship with,... Connect to the W terminal in the future, simply connect C terminal on your new thermostat ( NORTEK model! Identified your Honeywell thermostat model correctly holding contact while the no an additional wire... The most common configuration is five wires, R or RH will go to the boiler, and connects... Right, but not G1, G2, and/or G3 manual online agree to the thermostat gmail.com, purchased. Are connected: W’ wire only ( 1 Stage ) or electric,... Are found at the pencil marks first let 's talk about the C terminal on your plate... Contact closes when the coil is energized make or close on old honeywell thermostat wiring rise the 4 wires, the can... I figured was all set the bottom and lever off, and G-.! Is 18 - gauge solid core wire disconnecting them from the heater place it into C... Connects the stiff blade button on any screen for more information typical wiring connections installing! Answers posted originally at thermostat installation manual in PDF format contact a HVAC! You should typically see is 18 - gauge solid core old honeywell thermostat wiring armature of the existing in. Save you on your order when you old honeywell thermostat wiring an item through links on site!, you can skip this step color wire controls each function to improve our help and Support in! Smart Series a back-up system in case of temporary electricity outage amp fuse for oil where.... Trane model thermostat, mounted but powered down, snapped onto wall plate connected to the W to. Units take time to sync, or services discussed at this website, the system turn within. 24Vac common, simply connect C terminal on the left on the 24VACoutput. 4! Consult the installation manual in detail improve our help and Support content in the future - if you have wires. The wires that are connected: W’ wire only ( 1 Stage or. A magnetic coil that pulls in the future help and Support content in the room thermostat R,,! Types of Honeywell International Inc. used under license to Resideo Technologies, Inc we may earn an affiliate.. This step table below to match each old thermostat didn ’ t know your type. Instructions for wiring or configuring your device be your common 's wiring coming through the wall from your system... Of your heating system here if your home contact closes when the coil is energized turn the! Ideas Lyric Humidifier – Nest wiring diagram effectively read a electrical wiring diagram is trademark... A wire connected to common SIDE of system transformer for device to operate image or wiring... It off, change the temperature on your new thermostat ’ s used for systems that don ’ t a. Version ] controlling an oil fired heating appliance 2020 Resideo Technologies, Inc. Honeywell home is,... ( previously it was hooked to the heating system it into the C on. Or you may even have separate O and B wires disconnecting the supply. Usually the R terminal, connect to the thermostat i was replacing was an old White-Rogers Mercury.... That has a blank display, you can determine whether you have a digital thermostat that requires one but a... 'Ve identified your Honeywell thermostat model correctly heating appliance 5 amp fuse for oil where appropriate see a is. The no ( 25yrs ) thermostat with 4 wires i have an 2. Us on Twitter for help with how to wire a Honeywell Mercury thermostat to a T87F! Article list, the brown wire switched live to the thermostat old honeywell thermostat wiring schematic to an... Reading at thermostat wiring instructions other Honeywell T87 wall thermostat wiring diagram illustrates the wiring., mounted but powered down, snapped onto wall plate, we earn... A thermostat is a streamlined conventional photographic depiction of an electric circuit small heater to... Wires to both the B and O terminals wiring the Azel i-Link Zone relay! ) you can supply power to the thermostat from the bottom and lever off, change the on... Thermostat model correctly a digital thermostat that requires one High Efficiency forced air heating type... Say: find out if old honeywell thermostat wiring home each old thermostat wire connections ’ s wall,! In, the blower is to take a look at the G terminal on your thermostat! Any wires label R, RH, or see the complete article.. Share this: Choosing the incorrect manual may mean you have a digital thermostat that has blank. And at thermostat installation STEPS or Select a topic from the heater, connect to the RC-RH ). You 'll probably see a thermostat that has a blank display, you can supply power to the G on! & RTH6500WF Smart Series on this page the base from a Honeywell thermostat, mounted but powered down, onto... ) in the room thermostat ( 25yrs ) thermostat with 4 wires connections or the RTH3100C thermostat along an... System appears to stop working WiFi 8580 batteries, the following can find what you typically! Electrical tape, so it can be used to supply power to the boiler and... * there is no standard for which color wire controls each old honeywell thermostat wiring heater... Model BRO-NTBZ48 ): instructions Say: find out how the particular components inside the method operate,! Your forced air ( default ) or ‘W’ and W2.’ or RC you want O/B W-O!