Frost Stat Issue - System not working when connected

[TJ Anderson]

TJ Anderson, It won't if there is an bypass fitted as I posted above. The abv will be plumbed in before the valves so that it opens when the valves close.

Sorry mate....Didn't see that you'd mentioned the bypass already

 

[rolyberkin]

Then you could end up with an unhappy customer complaining about their house being too hot. Avoid that by fitting a pipe stat on the return at the boiler in series with the frost stat.

Yes I am trying to add a a pipe stat as this is what exactly happened last Winter they couldn't understand why they couldn't turn the heating off, there is no bypass valve at the moment which I have told the customer this needs urgent attention by a plumber. This is where my problem lies as I have not got that far, there is an existing frost stat which was on the original system hard wired to the outhouse where the boiler is but when I connect it nothing works at all even my controls for the hot water system.

 

[rolyberkin]

I had wired to the orange of the valve not the brown, all working now! Doh!