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UFH wiring - no terminals for valve

Discussion in 'Plumbing and Central Heating' started by d90n4c, 3 Dec 2020.

  1. d90n4c

    d90n4c

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    Evening all. Looking for some advice on a wet UFH install. I have a SCU209LED-TM wiring centre, which helpfully has no terminals for a 2 port valve (which is installed on the flow to the manifold). Link here:

    https://underfloorheatingexpress.com/amfile/file/download/file/6/product/277/

    Note that the system has programmable room stats only, so no Timer connections and due to it being part of a bigger system there is no connection back to the boiler (its effectively always on due to design of the system), its just the pump wired in to S1. Any advice much appreciated.
     
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  3. EFLImpudence

    EFLImpudence

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    I've asked for you to be moved to the Plumbing and Central Heating department.

    Meanwhile - I don't know the answer but is this any help?

    upload_2020-12-4_1-26-12.png
     
  4. d90n4c

    d90n4c

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    Thanks. I am not sure whether this remains valid if there is no boiler attached to G1 terminals?
     
  5. EFLImpudence

    EFLImpudence

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    Bump. I'm interested. :)
     
  6. ianmcd

    ianmcd

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    Why is there no boiler ? what is going to heat the UFH ?
     
  7. wannocks

    wannocks

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    One option is to wire the valve to the L1 terminal and use the end switch in the valve to power the pump.
    It does need a connection to the boiler to switch the boiler on when heat is demanded. (Leaving the boiler on at other controls is not a good idea)
     
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    DIYnot Local

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