Question about Heating & Cooling
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
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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Posted on Jan 02, 2017
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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