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Central Heating & Storage Heaters Forum
Viessmen 100T boiler wired within a Sunday Plan
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<blockquote data-quote="Racricket" data-source="post: 432043" data-attributes="member: 28232"><p>Ive noticed Y plans show a return cable to the HW off on the programmer and the valve used in a y plan is a 3 port valve which doesn't have the brown cable to energise the motor..</p><p></p><p>The S plan does have the brown cable to energise the motor but doesn't show a return cable to the HW off terminal in the programmer...</p><p></p><p>So it seems the plumber has used a 2 port valve on a y plan system hence why I've not wired a 4 core to the cylinder stat </p></blockquote><p></p>
[QUOTE="Racricket, post: 432043, member: 28232"] Ive noticed Y plans show a return cable to the HW off on the programmer and the valve used in a y plan is a 3 port valve which doesn't have the brown cable to energise the motor.. The S plan does have the brown cable to energise the motor but doesn't show a return cable to the HW off terminal in the programmer... So it seems the plumber has used a 2 port valve on a y plan system hence why I've not wired a 4 core to the cylinder stat [/QUOTE]
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Viessmen 100T boiler wired within a Sunday Plan
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