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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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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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