A thorough list of diagnostic steps is at NO HEAT - BOILER, On 2020-11-19 First, did you confirm what the blue wire is doing in your wiring harness? What should we do to improve this article? 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. A second set of contacts will make or close on temperature rise. If you identified an O, B, or O/B wire connecting to the O/B terminal in the previous step and it has a separate W wire, place it into the W2 terminal.

In some cases, one of those wires is your common. See the diagram below for the role of each wire in your system: 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. I am willing to supply an additional wire to supply continuous power to the thermostat. However, some lift from the bottom and lever off, and others have a locking tab. plate. have O wire. It's informative to see how a White Rodgers thermostat would have been wired -

C / X / B - do not connect - tape off bare wire ends, Y2 wire to Y2 terminal on the thermostat wiring bus bar, Rh, 4 or V wire to R terminal, after removing factory-installed metal jumper between R and Rc, Rc or R wire to Rc terminal, after removing factory-installed metal jumper between R and Rc, the Red wire is attached to 4, on the White Rodgers Thermostat, White wire broken: thermostat cannot pull in the relay and cannot hold it open - after a momentary shorting of the W-B terminals at the relay or valve, Blue wire broken: thermostat cannot pull in the relay or valve, but once the relay is forced in (closed) the circuit can hold, Red wire broken (or a loose heater plug screw) causes short cycling on the blue contact - single point operation, White wire shorted to the blue wire: relay or valve stays "on" unless all electrical power is shut off by the limit control switch, by disconnecting a wire at the low voltage transformer, or by turning off power to the system, White wire shorted to the red wire: thermostat can start the heater's burner but can't stop it, Red wire shorted to blue wire: short cycling (single pointing) on the white contacts alone, White & blue wires swapped incorrectly: causes short cycling on the blue contact, Blue and red wires swapped: short cycling on the white contact, Red and white wires swapped: normal operation except that the heater is effective too quickly - resulting in short on-cycles and inefficient operation, [5] Honeywell Controls, the company wants you to use their contact form at this web page: http://www51.honeywell.com/honeywell/contact-support/contact-us.html, Honeywell product model numbers & instruction Manuals: see http://yourhome.honeywell.com/home/Applications/FindYourModelNumber.aspx, [12] "Heating Control Handbook for the Installer and Service Man,Oil Burner, Gas Burner and Stoker Controls", Honeywell Corporation, March 1949 [copy on file as HoneywellControlsHandbookSA1399-2-1949.pdf] . valve honeywell thermostat millivolt I am planning to install a Honeywell RTH9585WF Programable Thermostat to control a 24 volt hydronic zone valve that draws .4 amps. Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, 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 ROUND THERMOSTAT OWNERS MANUAL, 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 FocusPRO TH6110D PROGRAMMABLE THERMOSTAT INSTALLATION GUIDE, Honeywell FocusPRO TH6110D / TH6220D OPERATING MANUAL, HONEYWELL Lyric Round WI-FI THERMOSTAT INSTALLATION GUIDE, Honeywell T6 Pro PROGRAMMABLE THERMOSTAT INSTALLATION INSTRUCTIONS, Honeywell T87F Thermostat PRODUCT DATA SHEET & CIRCUIT DIAGRAMS, HONEYWELL T8775C1005/U THERMOSTAT INSTALLATION & WIRING MANUAL, HONEYWELL TB7100A1000 MultiPRO @Karl H., 1. If the boiler runs there's a problem with thermostat wiring or possibly the thermostat itself. Referring to your photo, remove and label each wire. Thermostat Wiring Connections for typical Two-Wire Honeywell T87-F type Wall Thermostats. Jerry Rob, at THERMOSTAT WIRE CONNECTIONS - 6-WIRE Red, White, Blue, Yellow, Green, Orange Wires I hooked my old source1 back up and it is fine. Do not use C, C1 or X wire. @wayne, the 8-wire link I gave describes the usual brown wire connection & purpose. Y Compressor Stage 1 (Cooling) Next, lets talk about the C or common wire. I currently have American Standard heat pumps with propane furnaces' as back up. I'd like to replace the two thermostats with one that will operate both. The Yellow wire causes the valve to close when the system is satisfied. Functionally and for wiring they are similar. Be sure that you label the wires before disconnecting them from the old thermostat, or if you are installing new equipment, identify the incoming wires from the equipment terminals and its manual. 1-800-633-3991 Thanks. On 2021-03-24 In the garage end, the R & W are connected to the furnace. R is for red and also Rc but they seem to be bridged now. To protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling.

Or see THERMOSTAT WIRING HONEYWELL FAQs - questions and answers posted originally on this page.

Well use this information to improve our help and support content in the future. Only way to turn off the blower is to disconnect the tstat or unplug the blower. @danjoefriedman, When wiring, each wire should be identified by what terminal(s) it connects to never by color. In this sketch from a 1949 Honey Heating Control Handbook the thermostat has been satisfied (both contacts are open) and the system is not calling for heat. To confirm your system is off, change the temperature on your existing thermostat, so the system starts heating or cooling. At the thermostat end, it is a Honeywell "Heat Only" CT87K, it has the R W Y connected to it.

and short other wires. The valve connectors are labeled with numbers 1-6. Honeywell Series 10 controllers such as the Honeywell R19A use a simple relay and built-in transformer and one or more line voltage contactors. @Vicki, You typically have one or two of those three. It can be W-O/B, O/B, W-O, W-B, or even separate O and B wires.

O/B Reversing valve for Heat Pump systems Wrap bare end of wire with electrical tape. The thermostat simply needs to act as a SPDT switch to supply power to the motor to open and close the valve. My thermostats have closed circuit between R (red wire) and Y (green wire) when no heat is called for. Thermostat wiring details & connections for nearly all types of Honeywell room thermostats used to control residential heating or air conditioning systems. Copyright 2022 Resideo Technologies, Inc. Honeywell Home is a trademark of Honeywell International Inc. used under license to Resideo Technologies, Inc. I have a 3 wire boiler heat system Red,White, Green but was only using red,and White I bought the honeywell RTH5160 Series do I need connect the Green wire, Forgot to mention it's a non programmable thermostat RTH5160. 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. 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. Searching the Honeywell site for the corrected thermostat number delivers a single product that's probably yours, the 5-2 Day Programmable Thermostat - RTH2300B1012. So give us the specifics of your zone valves and together we can go to our page where we have the wiring instructions for that model. Since it's alternating current or AC it shouldn't be critical. We purchased a 30 yr old home that has central AC (outside and attic), and a combo furnace/hot water on demand (garage), each with it's own thermostat. It will power open the zone valve, closing R&W, but when upper temp limit is reached, no apparent way to close R&Y. I think the best way we can sort this out is to look at the wiring diagram for the correct model zone valve. 'C terminal must be connected to common side of system transformer for device to operate'. E Emergency Heat any two of the following wires: R, RC, RH, 4 and V.[5], 2. Both thermostats are wired into the hydronic valve. Select Standard Efficiency Forced Air (default) or High Efficiency Forced Air. On a drop in temperature the flexible blade makes the white contact, and subsequently connects the stiff blade. I have a boiler with a hydronic zone valve that controls two zones. This type of wiring requires a line voltage thermostat and is not compatible with low voltage thermostats. Your new thermostat may not be directly compatible if you see terminals labeled A B C, or 1 2 3, as your system requires a communicating thermostat. The contacts in the thermostat are rated at 1 amp so that should be OK. The white wire opens the valve when the system makes a heat call. 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. there is a four strand wire ( R W Y B ) that runs from thermostat to garage. Your heating system type - If you selected Hot Water or Steam on Your system type, select the specific heating system here. This article gives a table showing the proper wire connections for Honeywell brand wall or room thermostats used to control heating or air conditioning equipment. I have 30 year old White Rogers 3 wire mercury switch thermostats running power on and power off White Rogers zone valves in a radiant heating system in Alaska, no air conditioning. Your backup heat No or Yes (default) you can determine whether you have backup heat. Below are alternative wiring connections for the Honeywell RTH3100C thermostat along with an explanation.

Here is a copy of the HONEYWELL RTH2300/RTH221 SERIES PROGRAMMABLE THERMOSTAT OWNERS MANUAL [PDF]. Sorry, something went wrong. All day (24 hours), Monday through Sunday.

Thanks Ryan, that will help other readers. Thermostats may have a jumper switch, metal staple, or plug. Make sure the terminal markings are visible. 2 is a line voltage contactor. You should typically see an 18-gauge solid core wire. I don't understand the B connected to the transformer on the one end, but loose on the other.It would seem wrong, but the system works. The Y also confuses me in that most any other system, Y would be AC, but this thermostat is advertised as "Heat Only". stages Select 1 Stage (default) or 2 Stages. 2. Thanks so much man. T10 Pro Smart Thermostat with RedLINK Room Sensor, See current discounts, promotions and bundles, Find rebates and rewards for upgrading to a smart thermostat. At left the thermostat wiring diagram illustrates the typical wiring connections when installing a Honeywell RTH2300 (or similar) programmable room thermostat. The thermostat uses one wire to control the primary functions of your HVAC system, such as heating, cooling, and fan. On 2021-03-17 [10] Domestic Central Heating Wiring Systems and Controls, 2d Ed., Raymond Ward, Newnes, ISBN-10: 0750664363, ISBN-13: 978-0750664363, Quoting from Amazon.com: Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Do not use C, C1 or X wire.

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