3m50 to Wood boiler

Old 01-18-13, 05:26 PM
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3m50 to Wood boiler

I have a question. I am new to this... I have a Central boiler (outdoor woodboiler) with the following wire diagram. I am try to install a 3m50 and of course don't have a "common wire" . My current wiring diagram is like this:

Can I use what I already have to get the common wire or do I need to install additional ac eqipt?

THanks for your help!

Old 01-18-13, 07:40 PM
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Do you have an extra wire in the wall?

if you do, then use that wire, and then where does the t-stat wire go to? I am guessing to the Zone valve? if so, then use that same colored wire and piggy back on the #1 screw on the valve, that is oing to C on the transformer.

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