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Immersion Heater Wiring.

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A customer has an economy 7 immersion heater to heat water in a copper cylinder. That is all she has to heat the water, one element.

She needs a boost function. Easy I thought. Just install a boost timer control.

But the existing immersion heater is supplied from a non R.C.D. protected off peak board. The booster switch will need to be fed from a 24 hour on peak board. All the on peak boards are R.C.D. protected via one R.C.D.

 

So, what is the easiest way to switch from off peak to on peak boost whilst not getting the neutrals interconnected, and with an automatic default back to off peak after the boost period?

 

I was thinking about a double pole changeover contactor. Is there another way?

 

Z.

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    Several possibilities;

    Connect the water heater to the 24 hour supply, via a local time switch such that it is energised during the off peak hours every night, but with manual operation at other times when required.

    Fit a 2 pole changeover switch such that the immersion heater is normally connected to the off peak supply but can be manually switched to the 24 hour supply when needed.

    Fit a 2 pole changeover relay but operated by a “run back” timer, this gives the same functionality as the 2 pole changeover switch, but prevents forgetting about it and leaving the water heater on the peak supply for an extended period.

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  • 0

    Several possibilities;

    Connect the water heater to the 24 hour supply, via a local time switch such that it is energised during the off peak hours every night, but with manual operation at other times when required.

    Fit a 2 pole changeover switch such that the immersion heater is normally connected to the off peak supply but can be manually switched to the 24 hour supply when needed.

    Fit a 2 pole changeover relay but operated by a “run back” timer, this gives the same functionality as the 2 pole changeover switch, but prevents forgetting about it and leaving the water heater on the peak supply for an extended period.

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