thermal store

[SimonH2]

Originally the OP had something similar to pumping over. I agree it shouldn't be too bad now, but if he can find and cure the problem then it will be less water movement.

 

[hosegood]

Thanks for all your thoughts and suggestions, I will play around with whats been said. At least now its works and can heat up the building. Good to know I not too much of a dumbo
Cheers
Laurie

 

[SimonH2]

While it's deviating from your original query, I'd suggest you give consideration to fitting a modulating pump (such as the Grundfoss Alpha). By having the thermal store you have decoupled the CH flow requirements from the boiler requirements and so don't have any minimum flow to keep up.

Fit a modulating pump, TRV on every rad, no bypass loop - it'll be efficient and virtually silent. No room stat (so no worries about where to put it), just a time clock for the pump, and the TRVs set individual room temperatures.

 

[hosegood]

I will look into that as I am not over keen on this Wilo pump
Thanks again for your help
Laurel

 

[rainman]

Please can someone help on this one? Did you resolve your issue?

I have the exact same issue with a Gledhill open vented thermal store.

My setup is almost identical apart from my heating circuit is underfloor and I don't have a wood burner

When the pump starts water is drawn in from the header and expelled through the vent when it switches off.

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[SimonH2]

I think we came to the conclusion that the rad had a lot of air in it even after bleeding - but the OP doesn't seem to have come back with any update.

Is your layout the same as the OPs ? If not, can you upload a diagram ?

 

[rainman]

Very similar layout,

Both underfloor manifolds have been pumped to clear any air, I can only think its air in the pipe between the house and garage.

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[rainman]

Untitled

• rainman
• 20 Nov 2014
• 1

 

[rainman]

Any suggestions?

 

[SimonH2]

I can't see how any air is going to stay in that system unless you've got some quite large bore pipe between house and garage and it undulates a bit.

Normally, any air will travel round the pipes and settle out anywhere where the flow rate drops - such as in radiators, or in this case, the store.

Out of interest, what happens if you disconnect or switch off the pump on the return leg ? In principle, it shouldn't be needed as the UFH loop pumps should move the water round as required.

 

[rainman]

the pipe between the house and garage is 22mm and probably undulates a bit.

I did try without the pump running but it didn't really get hot (perhaps i wasn't patient enough)

 

[SimonH2]

Without the pump shown, the UFH pumps should pull hot water round the loop - but only as much as the loop TMV demands. If the manifold is col at startup thrn the TMV will demand 100% hot but it will reduce as the loop warms up.