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Double Insulated, yet....

AncientMariner
A few years ago I fitted a Cistermiser in the mens toilets of our village hall. For fitting simplicity I chose the 4 x AA battery option for power, although they do have an inbuilt 240v ac psu.  Today, intending to change the batteries, found that due battery leakage, one of the battery contact strips had corroded away.


Currently my intention is to fashion a new contact strip and thus repair it, but using the inbuilt 240v option also occurred to me.


So why, when this device is double insulated, have the instruction that if pipe minted, then can only be powered by batteries, but if I split the unit and have a cable from the unit to the water valve, I can use either 4 x AA batteries or 240v ac?  As it says on page 10 of https://www.cistermiser.co.uk/wp-content/uploads/2019/01/Infrared-Control-Valve-IRC%C2%AE-Installation-Guide.pdf  in Section 5.Power  "Do not mount a valve with Mains power directly onto pipework." "When fitted directly onto pipework, only use Battery power."


Seems strange.


Clive






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  • 0
    The model I had fitted was the old square version, whereas the pdf I linked to is more rounded.

    Anyway, I telephoned their Tech Support line and turns out that the requirement is on the basis that electricity and water do not mix.


    The new model certainly appears more susceptible to water ingress, but the old square version less so, I think. In reply to Brian, to get to the valve for anything more serious than setting the trickle flow, you have to remove the "box" from the solenoid.  The rear of the "box" having a standard 3-pin solenoid valve connector.


    If there is a live loop-in terminal at the nearby ceiling rose, I can go for the split installation method, with the additional, if I can fish through the low voltage cable to the valve...

    Clive

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  • 0
    The model I had fitted was the old square version, whereas the pdf I linked to is more rounded.

    Anyway, I telephoned their Tech Support line and turns out that the requirement is on the basis that electricity and water do not mix.


    The new model certainly appears more susceptible to water ingress, but the old square version less so, I think. In reply to Brian, to get to the valve for anything more serious than setting the trickle flow, you have to remove the "box" from the solenoid.  The rear of the "box" having a standard 3-pin solenoid valve connector.


    If there is a live loop-in terminal at the nearby ceiling rose, I can go for the split installation method, with the additional, if I can fish through the low voltage cable to the valve...

    Clive

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