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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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    I can't vouch for the terminal ordering/position, but the wires to the timeswitch look to be about what I've seen before around here. Meter output goes to a DP Henley, from there L comes back to the timeswitch where it's SP switched to provide the off-peak supply - which goes past the side of the henley up to the CU, N to the CU comes straight from the Henley. I'd expect another L (and probably N) to the CU direct from the henley to provide the 24h supply,  but can't quite see that in the photos (possibly be hidden behind the off-peal tails). The smaller wires are fused down to provide power to the clock and a switched N to prompt the meter to switch recoding between the peak and off-peak registers.


    It might make more sense if we could see the CU(s) and this st6400c - together with any associated equipment e.g. any contactors/relays.

       - Andy.
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  • 0
    I can't vouch for the terminal ordering/position, but the wires to the timeswitch look to be about what I've seen before around here. Meter output goes to a DP Henley, from there L comes back to the timeswitch where it's SP switched to provide the off-peak supply - which goes past the side of the henley up to the CU, N to the CU comes straight from the Henley. I'd expect another L (and probably N) to the CU direct from the henley to provide the 24h supply,  but can't quite see that in the photos (possibly be hidden behind the off-peal tails). The smaller wires are fused down to provide power to the clock and a switched N to prompt the meter to switch recoding between the peak and off-peak registers.


    It might make more sense if we could see the CU(s) and this st6400c - together with any associated equipment e.g. any contactors/relays.

       - Andy.
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