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Connecting a Volt Free link to the boiler

Discussion in 'Plumbing and Central Heating' started by Rickoniz, 14 Sep 2021.

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  1. Rickoniz

    Rickoniz

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    Hi,

    Please could someone help me resolve which connection should be made from my Under Floor Heating control centre which calls for heat using a volt free switch.

    I have an ideal boiler which has opentherm which has been currently looped, also it has L and L2 connections please see attached.

    Im not sure which to connect to?

    Ive posted instructions of the control centre and boiler

    Thank you

    Rick
     

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  3. DP

    DP

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    SL1 is connected as volt free ATM ( check by what is connected other end of grey and black pair). Almost certain SL2 is same but I would be checking for confirmation. While again not saying this with confidence ( would confirm first) Logic may allow you to set the UF heating to lower run temperature and cylinder to higher depending on what is calling for boiler to run
     
  4. Rickoniz

    Rickoniz

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    Hi DP

    Thank you for reply.

    I suspect the same but not 100% sure. We do have UFH in thr existing proprety, the grey and black wire suggests its from the control centre.

    The new UFH installed recently has a control centre which calls for heat. I suspect most setups are similar.

    Its the Volt free switch on the Control centre needs to be wired to the boiler to call for heat. The diagram depcits this as ornage and grey wire inc earth.

    Does the orange or grey need to be connext to L and the other to SL2? I suppose the colour wire doesnt matter as long as it returns back to the boiler as a switch.

    Thanks

    Rick
     
  5. DP

    DP

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    Hi Rick
    Look at page 38 of the manual
    SL-1 is axillary live connection ie boiler electronics will make terminal 5 live
    CH and HW motorised valves grey will connect to terminal 5
    CH orange will go to 4 and HW to terminal 6

    on some boilers, as I said earlier, one is able to set max temperature depending on which terminal is getting bridged by grey and orange wires.

    Voltage free tag often plays havoc with installers thinking.
    All it means is the switch pair will act as a loop across say terminal 4 and 5 instead of source mains voltage from elsewhere ( even different fused source) to put mains demand on terminal 4 like shown in picture 3 to run the boiler.

    If you have a mix of radiators and UF heating plus cylinder, I would connect the volt free to run UF motorised valve and the MV grey and orange of three motorised valves would ultimately link up to terminals 4 and 5 of boiler to run the boiler to any Motorised valve opening to demand
     
  6. Rickoniz

    Rickoniz

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    Terminal 4 on the boiker is PL pump live.

    Surely i dont connect to this?

    I onky have two zone UFH control centre. No radiators.

    The Heat Enable connection on the control centre Volt Free connects to terminals 2 and 3 on the boiler right?
     
  7. Rickoniz

    Rickoniz

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    I attached the UFH diagram in the original post
     
  8. DP

    DP

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    Is the boiler a system or heat only
    Diagram refers to heat only boiler
    CFED6D1C-5AA1-4307-BEFD-E36BA1CE818C.png
     
  9. DP

    DP

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    How do you heat water for hot taps
     
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  11. Rickoniz

    Rickoniz

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    Hi,

    We have a cyclinder which the boiler connets to and this heats up the water for taps etc

    Please see attached images of both the boiler diagram and Control Centre.
     

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  12. flameport

    flameport

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    The UFH controller connects to the rest of the control wiring, which is where the zone valves for the HW, other heating, cylinder thermostat and whatever other controls you have are already connected.

    It does not connect directly to the boiler.
     
  13. Rickoniz

    Rickoniz

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    Hi Flameport,

    Yes the control centre has all the therms, valve, pump and power source already wired into it. There also needs to be a wire switch connection to the boiler which calls for heat.

    Everythint is in the diagram attached in the original post.
     
  14. Rickoniz

    Rickoniz

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    Hi DP,

    Thank you for your help today. Its greatly appriciated.

    All im after is someone to advise where i connect the volt free LS and LR switch cable on the Ideal boiler. This is to simply call for heat when the control centre asks...


    Can anyone exprienced please help?

    Kind regards

    Rick
     
  15. flameport

    flameport

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    The control centre for the rest of the heating system, where the cylinder valve, cylinder thermostat, programmer/timer and whatever else are connected.
    Most likely found at the end of the 5 core flex that's currently connected to the boiler.

    NOT the new UFH controller.
     
  16. CBW

    CBW

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    DP is experienced o_O (as is flameport).
     
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