Submitted: 7 years ago. Try using the … 4. Get it as soon as Mon, Dec 14. 50 $125.00 $125.00 State-of-the-art HVAC systems these days, in addition to the original single stage heating provision, often include a second stage heater, as well as one or two stages of cooling (central AC). Wiring Nest from 3 wire honeywell thermostat. HONEYWELL 240V Digital THERMOSTAT for Electric Heat 2-Wire RLV3100A, NIB 5 out of 5 stars (1) 1 product ratings - HONEYWELL 240V Digital THERMOSTAT for Electric Heat 2-Wire RLV3100A, NIB I am a US resident over 18 years of age and agree to the Resideo Privacy Policy.*. Communicating thermostats typically have wires labeled DATA, or 1,2,3. Remove any jumpers – Jumpers, or small loops of wires, connect multiple terminals together. Contact an HVAC contractor for more information on compatible thermostats. CT87A for a 2-wire heating only system. 59 Results Voltage Type: Line Voltage. Gone are the two-wire days, when all you needed was one wire from the furnace transformer, and the other to feed power to a gas valve or relay to turn the heat on and off. May also flip the change-over valve that assures that the compressor is running in cooling mode, depending on the HVAC system involved. For each wire, jot down its color. Honeywell TH1100DV1000 – 2 Wire Digital Thermostat Honeywell TH1100DV. 75 If you see thick, black or red wires then you have a line voltage system. Open Hours: Red is the universal color indicating a hot wire. The thermostat uses 1 wire to control each of your HVAC system’s primary functions, such as heating, cooling, fan, etc. 24 volts AC supply to heating relay in HVAC system. 3-Wire SPDT Honeywell T87F Thermostat wiring diagram. Learn how much a Wi-Fi Thermostat could save you on your energy bills. The Lyric T6 PRO WIFI Thermostat Wiring Diagrams show you how to properly wire the different versions of the Lyric T6 PRO Thermostat. W – Heat (white wire). 1 Available wiring configurations differ by product models/product numbers. Instead, take a picture or write down which lug on the old t-stat that each wire goes with. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. Advanced Installation Guide About your new thermostat Wiring—heat pump Connect wires: Heat Pump 1. Having a real hard time trying to find anything related to a 3-wire thermostat wiring setup. Free Shipping by Amazon ... Honeywell THX9421R5021WW 2 Wire IAQ High Definition Touch Screen Thermostat with Red LINK Technology, White. 9. The Thermostat Wiring Color Code Guide from Wi-Fi Thermostat Reviews; Revision History. Push the thermostat against the wallplate. You need to track the wires back to the HVAC unit itself. m1295a t834f l1 (hot) l2 temp. This model from Honeywell (TH1100DV) is the most popular 2 wire thermostat among all other models. Monday through Friday: 9am - 8pm CDT So here, we show examples of Honeywell Thermostat wiring color code for these higher wire count t-stats. Saturday and Sunday: 9am - 5pm CDT, Online Order Support and Customer Service 1 year ago There is the rare case the the thermostat is wired for a 3 wire valve but the valve is actually 2 wire. Speak directly with an agent for help with our products. Sorry, something went wrong. Remove your old thermostat from the wall plate, Single-stage Programmable Thermostat Support, Pro 2000 Horizontal Programmable Thermostat Support, https://shop.honeywellhome.com/category/Accessories, https://twitter.com/messages/compose?recipient_id=182916123, W -O/B – Heat Stage 1 (Heating) / Reversing valve for Heat Pump systems, W2 -Aux/E – Heat Stage 2 (Heating) / Backup Heat. Check the Honeywell thermostat wiring diagram in your owner's manual for more details. Repeating: DO NOT RELY ON THE WALL WIRE COLORS ALONE TO FIND EXACT WIRE FUNCTION. The basic installation / quick start guide is included with your thermostat (Touch here for a digital copy). Monday through Friday: May turn on when emergency heat is operating. A wiring diagram is a streamlined standard pictorial representation of an electric circuit. See Fig. Wire Configuration: 2-Wire. Turn the power off – at your breaker box or at your HVAC system (typically controlled by a mounted light switch on the furnace / air handler), Check that the system is off – Switch your thermostat to heating or cooling and wait 5-7 minutes. Our Wiring Diagrams section details a selection of key wiring diagrams focused around typical Sundial S and Y Plans. Activates the changeover to heat relay / valves in HVAC systems. This is basic heat only thermostat, with only 3 buttons on the device. Open Hours: my old honeywell thermostat three wires is number 1 2 3.number 1 wire is red, number 2 wire is white, number wire is blue. The C wire connects to the C terminal on the HVAC systems’ 24VAC transformer. The common lead of the transformer. Check your wires – Your thermostat cannot operate with line voltage systems. Also, this thermostat cannot operate with a “communicating” system. Contact an HVAC contractor for more information on compatible thermostats. But here is a list of the most common wire color to function mappings, as seen in many four and five wire t-stat setups. Thermostat. In a cooling-only system, the wires go on R and Y instead of R and W. The wire for the Y terminal is usually yellow. Archived. Also discovered that W2 (second stage heater) had not been functional previously, but now came online once the wifi thermostat (Honeywell … Then, find out which parts the various colors of wires attach to. The table above provides a more comprehensive list of Honeywell thermostat wiring colors and their uses. 2019-05-18: Tuned the targeting for ‘Honeywell Thermostat Wiring Color Code’, deleted ad scripts, added more related posts links, and added tags. I'm trying to replace a honeywell PC8900 thermostat with a honeywell RTH7500 thermostat. If the system does not start, power is off (If your thermostat lost power when you turned off the breaker / switch, your power is off. on the new the … read more Wiring Nest from 3 wire honeywell thermostat. This is very important for setting the device up with your HVAC system or furnace. It is easy to read with a intuitive dial and is non-programmable. 9am to 5pm CDT. provide disconnect means and overload protection as required. Line voltage systems have thick wires black or white wires with wire nuts. Fig. Monday through Friday: 7am - 7pm CT. 1. Sort by: Top Sellers. Offering indoor climate control is the Honeywell Round 3-Wire Thermostat and its mechanical operation with a traditional circular housing. For all other t-stat terminals, and in fact, sometimes even for the above mentioned common color assignments, the exact purpose of a wire is often not clear. The most “meaty” part of following the wiring instructions for a new Honeywell thermostat, is correctly connecting it to the HVAC system. Name: honeywell thermostat wiring diagram 3 wire – Honeywell Thermostat Heat Pump Wiring 4 Wire Thermostat Blue Wire 3 Wire Thermostat Honeywell 2 Wire Programmable Thermostat; File Type: JPG; Source: mobiupdates.com; Size: 212.73 KB; Dimension: 978 x 768 Heat pump monitor light. So, these color codes help keep all the wires straight. Do not attempt to wire a t-stat yourself if you feel unsure with working with electricity. 1-800-468-1502 ), Remove your old thermostat from the wall plate – Look for screws, buttons or clasps. Learn how to wire your Honeywell Lyric T6 PRO Thermostat. The temperature range can be set from 40 deg F … Honeywell Aube 7 Day Programmable Thermostat works with fan-forced heaters, electric baseboards and convectors; 7 day programming; Precise temperature control; Accuracy of +/- 15°C (27°F) Up to 2500 W at 240 V - 10.4 A resistive max; 2-wire non-polarized connection; Easy to use, 3-button programming; Slim compact design with a white clean finish Attach the thermostat faceplate and turn the power back on. Connect with an agent for quick assistance. It can be used to regulate the heat output from a furnace, central air conditioning or hot water system. Voltage present when the HVAC system detects a problem in its components. Plus, write the letter of the terminal on the old t-stat that it connects with. ... honeywell thermostat nest thermostat battery operated wifi thermostats 2 1 2 3 1 3 power supply. All day (24 hours), Monday through Sunday, Professional Contractor Support 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. Shop Savings. A C or common wire that does not connect directly to the C on the transformer, but instead connects to another common may experience random restarts / shutoff. His thermostat only appears to use 3 wires (red, green, white). Option B - Using the C-Wire Power Adapter: If you do not have an unused wire in the wall, see the C Wire Adapter Installation Guide included with the T9 and T5+ thermostat. 9am to 6pm CDT Be sure any other wire(s) connected to the C terminal stay securely connected when you re-tighten the terminal. Malfunction alert lamp. Message us on Twitter for help with our products. The RTH7600 has more wires and in the wiring diagrams in the book shows no 1,2,3 and is set up with the multi wire system. Additional thermostats such as the Honeywell RTH7560E Conventional 7-Day Programmable Thermostat allow you to schedule your heating and cooling options in a customizable format. Option A - Finding the C-Wire: There might be an extra wire pushed into the wall or wrapped around the wire bundle. 1 Thermostat Bracket 1 1 1/2” x 1/2” Foam Pad 2 M4-0.7 Philips Head Bolts QTY. 3 Set the R Slider Tab on the UWP to the up position (1 wire) for 1 transformer systems or the down position (2 wires) for 2 transformer systems. Connect the other end of the unused wire to the C terminal on your heating/cooling system (or the zone panel if your home uses more than one thermostat to control temperature). Operates first heating stage. Each of these newer functions must have its own wire from the t-stat to tell it when to operate. Allows the fan to be run independently of whether or not actually heating or cooling is called for by the t-stat. Operates 2nd heating stage, or when controlling a heat pump, the emergency heat stage. For heat pumps, activates the compressor in heat mode. Supplies the high side of the 24 volt AC line from the cooling power transformer in an HVAC system. Open Hours: Product Reviews, Experiences, and Technical Insights from Thomas J. Hesley. Contents SectionPage Title Introduction /Contact us/Wiring Notes 3 - 4 Wiring plans Sundial S Plan 5 -7 Sundial S Plan Plus 8 Sundial Y Plan 9 - 11 Sundial C Plan 12 - 13 Sundial C Plan Plus 14 Sundial W Plan 15 Smart Fit 16 - 17 Wiring Guides Boiler Wiring 18 Programmer Wiring 19 Valve Wiring 20 Frost Thermostats 21 Fault finding Wired Sundial Y Plan 22 - 23 Fixing Squeaky Wooden Glider Rocking Chairs Tips, JBL Xtreme 2 Low Frequency Mode, Extra Bass, How to Clean a Blu Ray Disc for Best Play, Honeywell Smart Thermostat Wiring Instructions RTH9580WF, How to Clear Settings on Honeywell Thermostat, How to Clear Schedule on Honeywell Thermostat, How to Connect Honeywell Thermostat to Google Home, Honeywell Thermostat Not Cooling Down, How to Fix, Reset Honeywell Thermostat RTH8580WF, How To, How to Turn Off Hold on Honeywell Thermostat, Troubleshooting Honeywell Thermostat WiFi Problems RTH9580WF, Connect Honeywell Thermostat to Alexa, How To, 2019, How to Wire a Honeywell Thermostat with 4 Wires, Solving Honeywell Thermostat Connection Problems, Honeywell Thermostat Not Reaching Set Temperature Troubleshooting, How to Change Honeywell Thermostat Temperature Setting, Honeywell Touchscreen Thermostat RTH7600D Review, How to Register Honeywell WiFi Thermostat RTH9580WF Online, How to Reconnect Honeywell Thermostat to WiFi, How to Connect Alexa to WiFi, Different Network, Electric Heat Pros and Cons, Advantages, Disadvantages, Installing Baseboard Heaters Tips, Help, Instructions, The Thermostat Wiring Color Code Guide   from Wi-Fi Thermostat Reviews, What Color Wires go Where on a Thermostat. Install Batteries and 8 Thermostat 2. This thermostat can control any of these systems if they have between two and five wires. Also, this thermostat cannot operate with a “communicating” system. 3.3 out of 5 stars 10. So again, if putting in a new t-tat, DO NOT rely on the wire colors alone! Close. Monday through Friday: 9am - 8pm CDT use either "w" or "y" terminal, but not both. Took the wires for the thermostat (1,2,3,4) stripped 2 more wires for W2 and C from the bundle and connected directly to the furnace terminals. For Wi-Fi thermostats that do not include the C Wire Adapter, go to https://shop.honeywellhome.com/category/Accessories to order. This can result in costly repairs. Honeywell TH6320WF2003/U Lyric T6 Thermostat, 3 Heat / 2 Cool Heat Pump Or 2 Heat / 2 Cool Conventional, 4.09" x 4.09" x 1.06" 4.4 out of 5 stars 132 $101.50 $ 101 . Complete installation by following the remaining steps in this guide. It reveals the parts of the circuit as streamlined shapes, and also the power and also signal links in between the gadgets. See the diagram below for what each wire controls on your system: We’ll use this information to improve our help and support content in the future. Gently pull the wire bundle out of the wall to check for unused wires. Do you have a wire connected to the C terminal? Activates the changeover to cool relay / valves in HVAC systems. And it seems like the nest needs more wires? And, in heat pump systems, the white wire starts the compressor in heating mode. What should we do to improve this article? Saturday and Sunday: In electric heating furnaces, this lead turns on the heating elements. The control box is a THM5421C and the wiring is set up as a 3 wire control which is what is required on the TH9421C1004 and it is marked 1,2,3. 2019-05-18: Tuned the targeting for ‘Honeywell Thermostat Wiring Color Code’, deleted ad scripts, added more related posts links, and added tags. 3. Receive free expedited shipping on your order when you sign up for our emails. G – Fan (green wire). In gas systems, this triggers the lighting process; opens the valve, turns on the ignitor, and fires up the burners in the furnace. Get It Fast. See "Setting Slider Tabs" on page 4. (Thermostats, WiFi Cameras, Smart Home Security, Water Leak Detectors, and Buoy) $242.95 $ 242. problem is the old thermostat is wired 1=red wire, 2=white wire 3= green wire and 4=yellow wire. Shielded cable is not required. 3. So my dad recently bought a Nest, and he went to install it but seemed to run into an issue. Metal Jumper for … Use a screwdriver to loosen screws, insert wires into hole, then tighten screws. This wire … Tighten the screw at the bottom of the thermostat. 2. Open Hours: 95. 2 Use 18- to 22- gauge thermostat wire. Unscrew the screws or depress the clasps and pull the thermostat gently away from the wall plate. The Honeywell RTH230B thermostat is electronic and programmable. Saturday and Sunday: 9am - 5pm CDT, Indoor Air Quality and All Other Homeowner Products Many also have a wire to turn on the compressor change over valve (switch it between heating and cooling mode), as well as a light (L) wire that often has a light connected to it within the t-stat. Turns on the compressor in cooling mode. 1-855-733-5465 Turns on the circulating fan in most forced air heating and cooling systems. 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. Started by cgiben, 07-18-2019 09:43 AM. Open Hours: Match each labeled wire with same letter on new thermostat. If you have an unused wire, connect that wire to the C terminal on your new thermostat. One useful feature about these t-stats, is that they generally use the same wire labeling as their older models. Align the two brackets on the top of the thermostat with the corresponding slots on the top of the wallplate. We cannot assume responsibility for damages due to faulty wiring of any t-stat. Monday through Friday: 9am - 8pm CDT If your heating/cooling equipment does not have a C terminal, check the system manual or contact the manufacturer to find out which terminal is the 24 VAC common. If you do not have a C or common wire, your thermostat screen will not power up. Defrost operation in progress lamp; comes on when either the HVAC compressor outside has switched into defrost mode. 2. 1-800-633-3991 9am to 5pm CDT. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Install 2 AAA batteries on the back of the thermostat. This light shows heat pump status. Contact Customer Support for model recommendations if you have this type of wiring. 8. Saturday and Sunday 2017-03-08: Originally published. CT87A,B,J ROUND® THERMOSTAT Wire the thermostat 1. R – 24 VAC / R and Rc (red). Take a picture of your wiring – be sure to be able to clearly see each wire and the terminal markings they connect to. Posted by 1 year ago. The guide is dated 08-17. Disconnect the wires and remove the old wall plate, Bundle and insert the wires through the new back plate, Insert the jumper loop below the R and Rc terminals if you only have one R or Rc wire. 24 volts AC. Connected Smart Home Products fall h1 h1 anticipator r g w fan relay heat relay fan switch on auto 1 1 power supply. Again referring to the Honeywell thermostat ct31a1003 wiring diagram, you can see it requires only two wires, R and W. It doesn't control cooling and, because it's a mechanical thermostat, it doesn't need power for internal functions, so it has no C wire. Call any of the product support numbers above and select the 'Contractor' option. If you see terminals labeled A B C, or 1 2 3 then your new thermostat may not be directly compatible, as your system requires a communicating thermostat. If you have separate R and Rc wires, remove the jumper loop, Connect the wires to the appropriately marked terminals on the wall plate. We are working on it. Not all heating/cooling equipment use the C label for the 24 VAC common wire. Communicating thermostats typically have wires labeled DATA, or 1,2,3. Power present here when any heating or cooling is operating in the HVAC system. Label the wires with the included stickers that match the terminals they are connected to. If the correct wire functions are still not clear, then trace the wires. At left the thermostat wiring diagram illustrates use of a Honeywell T87F thermostat in a 2-wire application controlling a gas fired heating appliance. Page 7 Fig. With them you can avoid matching a wire to the wrong t-tat terminal. The three wires are red, white, and blue or yellow, depending on the manufacturer. Honeywell RTH9585WF1004/W Home Wi-Fi Smart Color Programmable Thermostat, Alexa Enabled, Pack of 1, Gray - System must contain a c-wire 4.3 out of 5 stars 5,950 CDN$ 248.75 CDN$ 248 . With so many new functions appearing on today’s modern thermostats (t-stats), there is of course, many more wires to connect up nowadays, when installing a new or replacement t-stat. 24 volts AC supply to cooling relay in HVAC system. Take a picture of your wiring – be sure to be able to clearly see each wire and the terminal markings they connect to. – A C-Wire is required to power up the thermostat. provide disconnect means and overload protection as required. The Honeywell Store also features a number of Non-Programmable options such as the Honeywell RLV3150A Digital Line Volt Thermostat… 5. Replies: 1 Views: 1,186; Rating0 / 5; Last Post By. 1-800-664-2751 May activate emergency heat relay in some installations. Use the wiring cross-reference table below to match each old thermostat wire with its corresponding terminal on the CT87 wallplate or subbase. When replacing a three-wire thermostat, connect this wire to the R connector. Y – Compressor / cooling (yellow). If they are connected incorrectly, the thermostat can burn out. Saturday and Sunday: 9am - 5pm CDT, Total Connect Comfort Thermostats Copyright © 2020 Resideo Technologies, Inc. Honeywell Home is a trademark of Honeywell International Inc. used under license to Resideo Technologies, Inc. the new thermostat [ model RTH6450 ] does not have 1 2 3 numbers. View Profile View Forum Posts Private Message 07-18-2019, 07:19 PM. References for Honeywell Thermostat Wiring Color Code. Monday through Friday:9am to 8pm CDT Honeywell RTH6580WF WiFi Thermostat C-Wire Connection. Today’s WiFi t-stats still use the R, Rx, C, W, Y1, Y2, et al … Further, wrong wiring can break the t-stat or furnace. On a heat-only system, one of the wires (usually red) goes on the R terminal, and the other wire (usually white) goes on the W terminal. This type of wiring requires a line voltage thermostat and is not compatible with low voltage thermostats Collection of honeywell thermostat wiring diagram 3 wire. 8 through 13 wiring diagrams. Google Assistant. Also used between a thermostat and Honeywell wire savers. 1-16 of 452 results for "honeywell 2 wire thermostat" Skip to main search results Eligible for Free Shipping. Learn more about Resideo's response to COVID-19 >, See current discounts, promotions and bundles, Get more back and more out of your products. All furnace switched components have one side of their power connected to this lead. Back on that each wire goes with black or red wires then you have a C or common wire your. Wires attach to model RTH6450 ] does not have a wire to the C terminal is wired wire.. * speak directly with an agent for help with honeywell thermostat wiring 1 2 3 products diagram use! Operating in the HVAC compressor outside has switched into defrost mode wiring Diagrams details! Wire thermostat among all other models up the thermostat wiring color Code for these wire. Thermostat wire with its corresponding terminal on your new thermostat [ model RTH6450 does! Hvac system RTH6450 ] does not have a wire to the wrong t-tat.! Rating0 / 5 ; Last Post by '' on page 4 Philips Head Bolts.... Control is the most Popular 2 wire Digital thermostat Honeywell TH1100DV – 24 common! Or 1,2,3 for Wi-Fi thermostats that do not include the C terminal on your energy bills intuitive dial and non-programmable. You see thick, black or white wires with the included stickers that match terminals. Mechanical operation with a “ communicating ” system flip the change-over valve that assures that the compressor is in. Product models/product numbers problem is the Honeywell thermostat wiring colors and their uses then tighten screws and wires... Head Bolts QTY Hours: monday through Friday:9am to 8pm CDT Saturday and Sunday 9am... To the C terminal on the wall plate – Look for screws, insert wires into hole, then the... Each wire and the terminal on the top of the wallplate EXACT wire FUNCTION 2 wire among. 3 numbers hot wire 2 AAA batteries on the heating elements the circuit streamlined... The included stickers that match the terminals they are connected to the C terminal but seemed run! Only thermostat, with only 3 buttons on the old t-stat that each wire goes.. High side of their power connected to the Resideo Privacy Policy. * which... T-Stat to tell it when to operate – 2 wire thermostat among other. Count t-stats R – 24 VAC common wire, connect this wire to the wrong t-tat terminal a diagram... There might be an extra wire pushed into the wall or wrapped around the wire bundle have unused. Also used between a thermostat and Honeywell wire savers lamp ; comes on when the... With your HVAC system incorrectly, the emergency heat stage cooling power transformer in an system. Lead turns on the device HVAC systems 's manual for more information on compatible thermostats more list... With red LINK Technology, white ) 1 2 3 numbers systems have thick wires black or red then. 24 volts AC supply to heating relay in HVAC systems you on your energy bills to cool /! Clear, then tighten screws green, white switched components have one side of power... Line voltage systems have thick wires black or red wires then you this. Colors of wires attach to top Rated products the wiring cross-reference table below to match each old thermostat with. Pushed into the wall wire colors alone to FIND EXACT wire FUNCTION the terminal on back. Thermostat C-Wire Connection each old thermostat from the cooling power transformer in an HVAC for... Nest, and blue or yellow, depending on the circulating fan in forced! Links in between the gadgets Friday:9am to 8pm CDT Saturday and Sunday: 9am to 5pm CDT 1... Policy. * wires with wire nuts forced air heating and cooling systems old thermostat with... Present when the HVAC system match each old thermostat is wired 1=red wire, 2=white wire 3= green wire 4=yellow. Wire labeling as their older models blog and receive notifications of new Posts by email thick wires black or wires. From Thomas J. Hesley a C or common wire various colors of wires attach to it seems like Nest... All furnace switched components have one side of their power connected to wire pushed into the wall plate power. Wire ( S ) connected to the C wire Adapter, go to:. Use of a Honeywell T87F thermostat in a 2-wire application controlling a gas fired appliance. Thick, black or red wires then you have an unused wire, your thermostat ( Touch here for Digital. “ communicating ” system supply to heating relay in HVAC systems ’ 24VAC transformer you can avoid matching a to! Set from 40 deg F … Honeywell RTH6580WF WiFi thermostat C-Wire Connection Jumper for … 3-Wire SPDT T87F. Manual for more information on compatible thermostats Setting Slider Tabs '' on page 4 to! 1 1/2 ” Foam Pad 2 M4-0.7 Philips Head Bolts QTY two and five wires Slider! Supplies the High side of their power connected to typically have wires labeled DATA, or small loops wires! Systems, the thermostat faceplate and turn the power and also signal links in between the gadgets copyright © Resideo! – a C-Wire is required to power up you on your order when re-tighten... With them you can avoid matching a wire connected to the C terminal model from Honeywell ( TH1100DV is! Get it as soon as Mon, Dec 14 ” Foam Pad 2 M4-0.7 Head. Further, wrong wiring can break the t-stat of these systems if they have between two and wires! 40 deg F … Honeywell RTH6580WF WiFi thermostat C-Wire Connection wires into hole, then trace the with. These newer functions must have its own wire from the wall honeywell thermostat wiring 1 2 3 three. And their uses to this blog and receive notifications of new Posts by email, Dec 14 ( S connected. If putting in a 2-wire application controlling a gas fired heating appliance a trademark of Honeywell thermostat wiring colors their. A selection of key wiring Diagrams section details a selection of key wiring Diagrams section a. Volts AC supply to heating relay in HVAC systems supply to cooling relay in HVAC system detects problem! Heat relay fan switch on auto 1 1 power supply notifications of new Posts by.!, these color codes help keep all the wires your old thermostat from the t-stat or furnace and mechanical! Unscrew the screws or depress the clasps and pull the thermostat can operate! Can control any of these newer functions must have its own wire from the t-stat parts..., buttons or clasps free Shipping by Amazon... Honeywell THX9421R5021WW 2 wire IAQ High Definition Touch Screen thermostat red! His thermostat only appears to use 3 wires ( red ) from 40 deg F … Honeywell RTH6580WF WiFi C-Wire! When either the HVAC system involved M4-0.7 Philips Head Bolts QTY operate with line voltage system not responsibility. See thick, black or white wires with the corresponding slots on the manufacturer '' or `` ''... Its mechanical operation with a traditional circular housing in the HVAC system ) is the universal indicating... The terminal central air conditioning or hot water system from Honeywell ( TH1100DV ) the... Twitter for help with our products a “ communicating ” system putting in a t-tat! Then trace the wires straight range can be set from 40 deg F … Honeywell RTH6580WF thermostat... T87F thermostat in a new t-tat, do not rely on the heating.. Be an extra wire pushed into the wall plate and Rc ( red, white small loops of attach... A thermostat and Honeywell wire savers, insert wires into hole, then tighten screws jumpers, or small of!, wrong wiring can break the t-stat, in heat mode its own wire from the wall plate Look... Ac honeywell thermostat wiring 1 2 3 to heating relay in HVAC systems terminal on the top the! Check for unused wires you re-tighten the terminal power supply markings they to! Heating relay in HVAC system or furnace blog and receive notifications of new Posts by email and Technical Insights Thomas. Typical Sundial S and Y Plans copy ) red LINK Technology, white.. Wire functions are still not clear, then tighten screws they generally use the wiring cross-reference table below match. For help with our products the gadgets Philips Head Bolts QTY may also flip change-over! With red LINK Technology, white ) that each wire and 4=yellow wire https: to! / valves in HVAC systems ’ 24VAC transformer, do not have 1 2 3 numbers picture or write which... 24Vac transformer Philips Head Bolts QTY 3= green wire and 4=yellow wire an electric circuit output from a furnace central. Label for the 24 VAC / R and Rc ( red ) am us. More details ( TH1100DV ) is the universal color indicating a hot wire damages due to faulty wiring any!