Underfloor heating pump

Mrm1982 · Aug 14, 2021

Hi guys just in the process of wiring up a 3 zone Drayton jb with 3 zone wireless heating controls.
My question is as it stands at the moment which ever zone is on ie rads, hot water and underfloor heating the pump on the underfloor heating will start running, now I’ve not done a lot with domestic systems as I’m a industrial sparks this is for my own house I’m renovating.
So what are you guys doing letting it run or is there some kind of relay mod I can do so the pump only pumps with the underfloor heating zone?
Any advice would be great thanks

[ElectriciansForums.net] Underfloor heating pump

UNG · Aug 14, 2021

Without knowing how your system is set up it is difficult to advise on the best solution to solve the problem
Does each zone have it's own zone valve and is each zone separately pumped or is it a single pump for the other zones controlled by the boiler or zone valves

Can you post up a diagram of how it is currently wired it may help to identify a simple solution

Mrm1982 · Aug 14, 2021

UNG said:
Without knowing how your system is set up it is difficult to advise on the best solution to solve the problem
Does each zone have it's own zone valve and is each zone separately pumped or is it a single pump for the other zones controlled by the boiler or zone valves

Can you post up a diagram of how it is currently wired it may help to identify a simple solution

hi bottom set up thanks

UNG · Aug 15, 2021

And the rest of the answer is........

UNG said:
Without knowing how your system is set up it is difficult to advise on the best solution to solve the problem
Does each zone have it's own zone valve and is each zone separately pumped or is it a single pump for the other zones controlled by the boiler or zone valves

Does the main pump have to run with the UFH pump for heat to the UFH?, are you using a low loss header?, a layout sketch of how the system is plumbed (boiler, pumps, valves etc )would help as you are looking at something beyond a standard wiring diagram.
I'm assuming the boiler has / needs a pump overrun to dispate heat when the system shuts down

bigspark17 · Aug 15, 2021

Put the ufh pump live into the brown wire of the motorised valve of the ufh system.

jackhammerJIM · Aug 16, 2021

bigspark17 said:
Put the ufh pump live into the brown wire of the motorised valve of the ufh system.

If the valve fails to open say goodbye to the pump

jackhammerJIM · Aug 16, 2021

If there are 2 pumps on the system a contactor/relay should be used ,

Resu · Aug 16, 2021

Most UFH wiring centres have two sets of relay controlled terminals, one for boiler call and one for UFH pump.

AJshep · Oct 4, 2021

Funny enough I've had to look at a job today, the customer wants me to remove all his Heatmiser RF stats and install Nest everywhere. I'm going to have to remove the relay box as their is no trigger input for each zone.( RF trigger only).

There's only 2 zones on the UFH and the customer is happy to combine them,
I'm not happy triggering the UFH pump from the brown of the valve so I'll pop in a 8 pin octagonal relay.

Sorry about the dodgy diagram.

Leesparkykent · Oct 4, 2021

I would just wire the ufh pump with the brown of the ufh valve. If the valve failed to open and the UFH pump was running then the blending valve would act as a bypass.

AJshep · Oct 4, 2021

Leesparkykent said:
I would just wire the ufh pump with the brown of the ufh valve. If the valve failed to open and the UFH pump was running then the blending valve would act as a bypass.

Good point, saves messing about with a relay then.

Underfloor heating pump

Mrm1982

UNG

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Mrm1982

UNG

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bigspark17

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jackhammerJIM

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jackhammerJIM

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Resu

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AJshep

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