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I have a Heatmiser UH1 – with the volt free contacts, this also controls all the room temps, a Danfoss HP22 zone valve (four wire) and an adjustable cylinder stat of far eastern origin. Sounds simple when I put it like this!

Yeah, yeah, next you will be telling us there is a differeince between plumbers and heating engineers!!!

Yes, I understand that’s why I put it to a simple system as I was not happy with what had been done. i.e. not working correctly. If it’s a simple system it suits simple people like me! I have experience of domestic and light commercial wiring but have not ventured in to heating controls. The...

Awesome, cheers doitall This will give 240v across the volt free contacts then? It was just going to be an expensive mistake to make if it was wrong. It was wired in to a Honeywell wiring centre with the zone valve and the cylinder stat. But it did not seem to work correctly, the zone...

Morning, Yeah, I gathered that from the rather vague WB instructions, but for the room heating controls I only have a volt free contact to wire back to the boiler and as Lr and Ls come bridged when you buy the boiler I was presuming that I wire back the volt free to here so the boiler will...

Evening all, I am just after a little help with my Worc 30 CDI conventional boiler. I am wanting to wire in a two port valve, cylinder stat to open the zone valve and start the boiler and a volt free 'boiler enable' contact on my UFH control panel. Am I correct in assuming that if you connect...

Evening all, I am just after a little help with my Worc 30 CDI conventional boiler. I am wanting to wire in a two port valve, cylinder stat to open the zone valve and start the boiler and a volt free 'boiler enable' contact on my UFH control panel. Am I correct in assuming that if you connect...