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Viessmen 100T boiler wired within a Sunday Plan
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<blockquote data-quote="Lurch" data-source="post: 432083" data-attributes="member: 6967"><p>You cannot use a 2 port valve on a Y plan, because then it isn't a Y plan. It is a physical impossibility.</p><p></p><p>There are various ways of using the stat, which actually has 2 thermostats in one housing. TBH if you are not really familiar with heating systems in general (which it doesn't sound like you are) then it is probably best to leave these types of things to those in the know.</p><p></p><p>Without seeing the entire system I couldn't really say what you did wrong exactly, so I will not try and guess how it should have been wired.</p></blockquote><p></p>
[QUOTE="Lurch, post: 432083, member: 6967"] You cannot use a 2 port valve on a Y plan, because then it isn't a Y plan. It is a physical impossibility. There are various ways of using the stat, which actually has 2 thermostats in one housing. TBH if you are not really familiar with heating systems in general (which it doesn't sound like you are) then it is probably best to leave these types of things to those in the know. Without seeing the entire system I couldn't really say what you did wrong exactly, so I will not try and guess how it should have been wired. [/QUOTE]
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Viessmen 100T boiler wired within a Sunday Plan
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