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"I am still worried about the other upstairs room stat though. I am correct in thinking that by connecting it to No.4 as per the other one, this stat will fire up the zone valve for that floor without conflicting the otehr zone vale? I guess thats the whole idea of individual stats, but I...

Thanks, thats what I thought. So I will need to connect the programmer to the junction box. For example, using Horstmann's wiring diagram, No 4 connects to the room stat [I am looking at their No 7 example, " Fully pumped system using roomstat, clyinder stat & two [2port] motorised valve with...

I'm new to this, so don't get angry if I appear a bit dumb! Basically, I am having a new boiler fitted, but to save me some money, I am doing the wiring work myself, which will be throughly checked by a qualified person when he also replaces my fusebox for a modern one, so everything will be...