Underfloor Heating Pump Controls

[Skids]

Hi All,



Need a bit of advice, I have a underfloor heating system going in, the set up is: heat is coming from a thermal store cylinder (open vented/ no pressure), UFH side is pressurized (due to high top floor). It needs a pump on the primary side (un pressured) to supply a ‘heat exchanger in the middle, which supplies the UFH side (pressurized).



Now, when I wire up the zone pump (of which there are 4) to come on when heat is called for, how do I wire up the primary pump to come on the feed the heat exchanger?



If there was only one pump either side it would be no probs, however with 4 manifolds each with a pump this is proving difficult. I need to start the primary pump independently form any of the 4 zone areas, otherwise all 4 zone pumps would run.



Anyone got a solution, apart from run away.



Regards



Skids

 

[ProDave]

Each manifold will have it's own manifold controller to take care of the manifold circulation pump and the individual zone actuators.

Each manifold controller normally has a volt free "call for heat" contact that closes when any of that manifold's zones calls for heat.

That contact needs to energise a 2 port valve feeding just that manifold.

So 4 manifolds, 4 manifold controllers and 4 2 port valves.

The feedback contact from all 4 2 port valves (the orange and the white) are connected in parallel and feed the primary pump that circulates head from the thermal store.

 

[Skids]

Hi Pro Dave,



Looks like the answer. Thanks for your time on this one.



Did not think about the zone valve terminal in regards to supply



Regards

Skids

 

[philbas]

Hi Pro Dave,

Looks like the answer. Thanks for your time on this one.

Did not think about the zone valve terminal in regards to supply

Regards

Skids

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