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Oso unvented cylinder mystery

Discussion in 'Plumbing and Central Heating' started by lostinthelight, 25 Mar 2019.

  1. lostinthelight

    lostinthelight

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  3. JohnD

    JohnD

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    I didn't understand that.

    it looks like your vid showed, after an initial delay when first powered up, that the iBoost fed a small amount of power to the heater, regulated presumably by the solar available; and then, when you pressed the timed boost, it seemed to feed power for the limited period.

    Have I missed something?
     
  4. lostinthelight

    lostinthelight

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    I dont believe so, fist off solar via the switch was supplying power then when manual boost is activated solar is replaced by power is taken from the mains which if the panels are generating, are still supplementing the supply
     
  5. JohnD

    JohnD

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    I don't see anything wrong with that.

    In the second state, is it 230v (or thereabouts) AC?
     
  6. lostinthelight

    lostinthelight

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    Yes probably because the fancy circuitry is bypassed, its just the DC stage thats firing the boiler, thats if you believe its capable of supplying Dc to the IH
     
    Last edited: 21 Feb 2020
  7. picasso

    picasso

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    Sorry haven't read the whole thread but try changing the electronic cylinder stat for a "mechanical" stat, I reckon the stat is suffering from the inductance on the 230vac immersion cable.
     
  8. JohnD

    JohnD

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    Might also be worth changing the flex for shielded, heatproof cable.

    I don't know if there is a supplier of small quantities of screening mesh.

    I have a Steinel tester that identifies AC or DC. No doubt there's a cheap way of checking it or damping the switch-on pulse.
     
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  10. lostinthelight

    lostinthelight

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    FWIW some time ago I’d actually pulled the thermostat and its probes well away from the tank and the problem still existed, how far do you think the field inductance would cover?
     
  11. picasso

    picasso

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    Are the cables for the stat and immersion heater run along side each other ?
     
  12. lostinthelight

    lostinthelight

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    They come from different sides of the tank but the thermostat probe would be very close to the IH wire when its in its pocket . When I moved thermostat to conduct the test it would at least half a meter away
     
  13. picasso

    picasso

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  14. lostinthelight

    lostinthelight

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    Thanks I’ll look into it but reluctant to change yet as its still under guarantee..I must say Oso have been less than helpful
     
  15. lostinthelight

    lostinthelight

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    Thanks for that, have a look at my post and could you please tell me if your controls are the same and how far from the cyl is the iboost.Oh, is it an iboost or iboost+
     
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