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3 wire white rogers zone valve operated by 2 wire thermostat any one have a wiring diagram?

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It is technically possible use a 2-wire thermostat with a 3-wire zone valve, but you need a single pole, double throw relay like a fan control relay with one normally open switch and one normally closed switch. 2-wire thermostats only have one switch that is normally open. 3-wire thermostats have two switches......one switch that is normally open, and one switch that is normally closed. The fan relay lets the 2-wire thermostat simulate a 3-wire thermostat. It's possible, but usually it's easier to just get a 3-wire thermosts.

Posted on Jan 18, 2010

  • carl tessmann Oct 17, 2012

    thank you Mel I am off to buy a relay and try it out, if it works I can stop banging my head against the wall

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Here's a link to an article I wrote about how to control a 3-wire zone valve with a 2-wire thermostat. http://www.geekwisdom.com/dyn/node/234

Posted on Jan 21, 2010

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  • edwardsn87 Nov 15, 2010

    i bought a 24v relay but mine isn't the same layout as yours can you help me wire it to a 5 prong relay. it has 30 85 86 87 and 87a on it

  • carl tessmann Oct 17, 2012

    I cant see the wiring diagram it will not open when I click on it.

  • Steve Moitozo
    Steve Moitozo Oct 18, 2012

    Sorry Carl. I've corrected the images.

  • carl tessmann Oct 20, 2012

    Thank you got it now and I appreciate your time and effort to share your knowhow.

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You need to use a three wire connection, two wire will not work.

http://www.white-rodgers.com/wrdhom/pdfs/06_Cat_pages/Cat_06_pg0298.pdf

Posted on Oct 09, 2009

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Posted on Jan 02, 2017

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SOURCE: connecting 2 wire thermostats to white-rogers type 1311 3 wire zone valves

Thank you for your interest with Emerson White Rodgers. My Name is Joselito Laxamana from technical department. Make sure to connect a thermostat that will power open and powered closed the zone valve. I pretty sure that the two wire thermostat that your going to connect will not be compatible. To better assist you with this further contact us directly at 18002842925.

Posted on Oct 16, 2012

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Wiring instruction for a White Rodgers 1F78 non-programable thermostat.


The White-Rogers 1F78 thermostat is a single stage 5/2 day programmable thermostat. Home Depot has the manuals for one model of this thermostat, 1F78-151, on the product page: https://www.homedepot.com/p/White-Rodgers-Single-Stage-Digital-5-2-Day-Programmable-Thermostat-1F78-151/202771121 . The wiring diagrams are in the Installation manual. The direct link to this manual is https://www.homedepot.com/catalog/pdfimages/f9/f955280d-67a2-4502-bb94-4975cd857c0b.pdf . Emerson Climate also has the wiring diagram here: http://www.emersonclimate.com/Documents/White-Rodgers/instruction_sheets/0037-6615.pdf .

If you have a different White-Rodgers 1F78 thermostat, check for the manual at Emerson Climate by starting at http://climate.emerson.com/en-us/products/thermostats/thermostat-manuals . Click on the Enter Model Number button and start typing in the model in the search box. I found a number of models with 1F78 listed. After selecting a specific model, I found a link to the installation guide on the left side of the page, below the search box. (Note: the manual link was above the Suggested Replacement header for the models that I checked.)

I hope this helps.

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Choose two colors of the thermostat wire, and connect them to the NO and COM and connect them to the zone control board leads for the zone intended. Almost all zone valves spring return open when deenergized. So ensure the zone valve is open with the system is off. At the base of zone valve there is a set screw that needs to engage the damper valve shaft in the open position with the motor in the spring release position. Most zone valve are 90 degree moment from full open to full shut. If you have a Carrier zone valve, they go full open to full shut in 45 degrees of motion. Your open stop need to be set so the valve stops in the full stop position.
To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
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Thank you for your interest with Emerson White Rodgers. My Name is Joselito Laxamana from technical department. Make sure to connect a thermostat that will power open and powered closed the zone valve. I pretty sure that the two wire thermostat that your going to connect will not be compatible. To better assist you with this further contact us directly at 18002842925.

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I would replace it with a White-Rodgers 1F80-0471. They are about $100, but they are a good thermostat, and they work well with the 3-wire zone valves.

Most other thermostats have the "Y" terminal that you need, but do not control the zone valve correctly.

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