Replacing 3 wire mercury switch thermostats with programable 2wire thermostats used for heat only application with 3 zones in house using white-rogers zone-a-flow type1311 hydronic zone valves (3 wire).
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.
SOURCE: 3 wire white rogers zone valve operated by 2 wire
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
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