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Immersion heater - economy 7 timer wiring

Former Community Member
Former Community Member
Hello,


I have a honeywell st6400c controller and an immersion heater. 

My heater has 2 switches, off and on peak. My concern is that the heating works only with both switches on. Even if its set to trigger at off peak time only, which it does, both switches light up and if I switch off the onpeak one, the heating stops even tho the offpeak is still lit (testing this at off peak hours ofc). Is this correct ? does this not use much more electricity? I was monitoring this and Im sure it goes against the "night" hours, but my worry is that it uses much more power than it should.

Thank you for your advice

Tom
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    Sparkingchip:


    I cannot imagine what the ST6400c is doing, unless someone has made up a homespun control unit using relays or it is severely overloaded it cannot be controlling the immersion heaters.


    Andy B.


    So it sounds like someone has made up a homespun control unit using relays.


    It could be that someone may have tried to set it up so that one of the immersion heaters will come on during daylight hours to use the electric from the solar panels, I really would not want to try and guess how it is set up or if it is even works and saves you money.


    Best of luck!


    Andy B.


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  • 0
    Sparkingchip:


    I cannot imagine what the ST6400c is doing, unless someone has made up a homespun control unit using relays or it is severely overloaded it cannot be controlling the immersion heaters.


    Andy B.


    So it sounds like someone has made up a homespun control unit using relays.


    It could be that someone may have tried to set it up so that one of the immersion heaters will come on during daylight hours to use the electric from the solar panels, I really would not want to try and guess how it is set up or if it is even works and saves you money.


    Best of luck!


    Andy B.


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