lilman
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Not my strongest subject this. Got to wire the above into an existing setup. The old boiler just had a switched live and neutral input. The new one needs permanent power - I can do that bit! External controls on the new one connect across terminals 3 and 4 in the boiler. Now I'm lost. Anyone got a diagram or some guidance please. Two port, two valve system with cyl stat and room stat; Potterton timer. Thanks all.