if it is the primarys need to be in 28mm, no 3 ports allowed and a bypass in 28mm, there is a diagram near the bottom of the instructions showing the bypass arrangment.
if it is the primarys need to be in 28mm, no 3 ports allowed and a bypass in 28mm, there is a diagram near the bottom of the instructions showing the bypass arrangment.
Hey Picasso thats bang on! The system is the open vented type, with cylinder stat. As I said before, I don't know about the bypass, whether its there, or a radiator is performing the same role as I can't access the flow pipes to the rads at that point. One thing is for sure though, and the first reason for the post, there isn't an expansion pipe from the heating side at all - but there is from the top of the copper cylinder, naturally. Thank you so much for this - I've been working totally blind until now
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