S plan system with 2x under floor heating zones

[egginyourface]

Ahhhh yes. That's another thing. Doesn't the boiler need a 230v switch Feed from the ufh box?

 

[D Skelton]

Yes, it will

 

[egginyourface]

Thanks all for the advice and pointers

 

[egginyourface]

Hello again everyone

The system has now been connected and working. Used the 2 channel programmer for ch and dhw and 2 programmable thermostats for the ufh.

There's one thing I don't understand, is it ok that the hot water and ch heating pump runs when the ufh heating is on only?

The ufh has its own pump

thansk

 

[D Skelton]

No, you've missed out some relays, if HW and CH valves are closed and the pump is running, without a bypass valve you'll blow it.

 

[egginyourface]

There is a bypass valve.

 

[D Skelton]

Then you shouldn't have a problem however I stand by what I say, you have missed out a couple of relays at the boiler connection to prevent both pumps firing up at the same time. There is the potential for the manifold pump to fire up when the HW/CH pump fires up depending on what control system is in place and the manifold almost certainly won't have a bypass valve.

 

[egginyourface]

Thanks for that, I will have to check if the ufh pump fires up when only the dhw and ch are on