UFH added to y plan

nohoper7 · 23 Sep 2011

My plumber has added ufh to my small extension and having done some research before hand was wondering whether this would work, in terms of controlling ufh seperate from ch. the ufh has its own room stat and my controller is 3 channel. have attached a sketch of how he did it.
I hope you can all help

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nohoper7
23 Sep 2011
1

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Agile · 23 Sep 2011

Well I am surprised that you are asking here when all you need to do is to try it ! Does it work?

Its unusual to operate UFH on an OV system but I dont see any reason why it should not work based on your diagram.

Tony

nohoper7 · 23 Sep 2011

Sorry haven't worded the question well. I have read alot about "backfeed" and that i should convert to s plan system otherwise when ufh calls for heat it will also call at the mid position.
The system isn't OV by the way. just had wrong diagram.

Agile · 23 Sep 2011

We can only assess your situation from the imformation which you provide to us. That was as OV !

But back to my main point, DOES it work ?

Tony

nohoper7 · 23 Sep 2011

As it has no baring on my question i was not expecting such a pedantic reply as to the OV! As for just trying it, it would be stupid to assume something electrical would just work without coming up with some facts first. Surely and decent plumber would have seen this set up before and would know instantly whether it would work. Just trying to save myself some time rather than going around the houses.

Thanks anyway

DeltaT2 · 23 Sep 2011

nohoper7 said:
My plumber has added ufh to my small extension and having done some research before hand was wondering whether this would work, in terms of controlling ufh seperate from ch. the ufh has its own room stat and my controller is 3 channel. have attached a sketch of how he did it.
I hope you can all help

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nohoper7

23 Sep 2011

1

[/img]

Where does the UFH Return connect to the Common Return?
The UFH pump will normally just circulate through the loops, depending on the size of the UFH system of course, and if the UFH system is on, on it's own, how you going to get circulation from the boiler to the UFH manifold?? Lastly, there's a danger of uncontrolled circulation through the open port on mid-poss valve(HW) when it's at rest. A circulation pump will circulate to anywhere if there's no valve in it's way & the resistance in not too big for the pump head.

spraggo · 23 Sep 2011

Not a good design, one pump could pull against the other when both on. this would cuase cavitation and if it was an OV system it would cuase water to be pulled down from the expansion tank and would cause pumping over via the expansion pipe, what size are the primary flow and retun pipes?.

adamsheating · 23 Sep 2011

nohoper7 said:
As it has no baring on my question i was not expecting such a pedantic reply as to the OV!

An uninformative response, but you are surely mixing the words pedantic and accurate up in this sentence. If you want an ACCURATE answer, put an ACCURATE picture on when asking about a specialised topic.

Or get your engineer back to explain it to you, instead of second guessing him.

monoxide62 · 23 Sep 2011

It aint gonna work.............is this a condensing boiler? , if not i can see trouble ahead.

picasso · 23 Sep 2011

You wont be able to have the ufh on its own as the three port valve always has one port open, so you will either have the rads on with the ufh or the hot water cylinder with the ufh, perhaps your "plumber" should have another go.

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picasso
23 Sep 2011
2

DeltaT2 · 23 Sep 2011

picasso said:
You wont be able to have the ufh on its own as the three port valve always has one port open, so you will either have the rads on with the ufh or the hot water cylinder with the ufh, perhaps your "plumber" should have another go.

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picasso

23 Sep 2011

2

A work of art Pizzcasso!!

DeltaT2 · 24 Sep 2011

picasso said:
You wont be able to have the ufh on its own as the three port valve always has one port open, so you will either have the rads on with the ufh or the hot water cylinder with the ufh, perhaps your "plumber" should have another go.

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picasso

23 Sep 2011

2

Can anyone stop the mistakes in this schematic picasso posted up??

picasso · 24 Sep 2011

I would have put the cylinder return as the last connection to the boiler other than that ?? (the cylinder isint showing as unvented)

DeltaT2 · 24 Sep 2011

picasso said:
I would have put the cylinder return as the last connection to the boiler other than that ?? (the cylinder isint showing as unvented)

The more I look at it mate, the more I'm seeing!!! But that's a good one for starters.

There's a major prize for getting them all!!

spraggo · 24 Sep 2011

OK o wise one, spill the beans

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UFH added to y plan

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