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Help needed! Hive heating and hot water

Discussion in 'Plumbing and Central Heating' started by Nathan Wicks, 26 Feb 2021.

  1. Nathan Wicks

    Nathan Wicks

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    Hi all,

    After many google searches I’ve come across this forum, I’m just about at my wits end!

    My current switch master SM300 has finally died and I’ve decided to buy a Hive heating and hot water earlier on today and have been trying to set up all evening/ night!

    I’m abit of a novice with wiring however I was told it was fairly easy to do!

    I tried to copy like for like with the wiring however it’s blowing the fuse every time and after trying different wiring setups, I’ve just about had enough!

    My setup:
    Potterton Kingfisher II
    Switch master SM300 with timed/ off/ constant switch
    Horstmann Centuarstat 7 in hallway
    Hot water cylinder in upstairs airing cupboard

    Can someone please assist where I’m going wrong and maybe help with wiring up new hive?

    I’ve currently taken it apart and put old SM300 on as I can still use the functions on constant.

    Any help is much appreciated
     

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  3. ianmcd

    ianmcd

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    The switch master SM300 is a single channel time switch not a programmer, so you will need a bit of rewiring the Dual channel hive wont just accomodat the wires in there, we need to know what system you have, I think it will be gravity HW a pic of your HW cyl should show it
     
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  4. Nathan Wicks

    Nathan Wicks

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    Hi Ian

    Cylinder in airing cupboard and fed via tank in loft

    potterton kingfisher II in kitchen has pump for CH if this helps?

    Thanks
     

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  5. ianmcd

    ianmcd

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    Yes you have a gravity HW system, you can wire the hive to work with this, but you wont get individual control of the CH you will only be able to have HW on its own, or CH+HW at the same time
     
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  6. Nathan Wicks

    Nathan Wicks

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    That’s ok. How do I go about that?

    I have the heating and hot water hive, should I return and get the single heating hive?
     
  7. ericmark

    ericmark

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    You have a boiler and a pump, and the Hive supplies each independently, so when you want central heating boiler and pump is supplied, but for domestic hot water only the boiler is supplied. Since you don't need access to the Hive base it can be fitted close to boiler.

    I did same in my house with Nest, the base (heat link) is in the annex with boiler but thermostat head is in the hall in main house. I used old cables but wired from scratch.
     
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  8. ianmcd

    ianmcd

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    no you need the twin channel which you have, is there a wiring diagram on the back of the cover of the SM300 ? can you post a pic if there is, you have wires in 1&2 I would have expected it to be 1&3 but cant find a diagram for the SM300
     
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  9. Nathan Wicks

    Nathan Wicks

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    Hi Ian

    appreciate the help, uploaded a few pics.
     

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  11. Nathan Wicks

    Nathan Wicks

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    N and 2 are linked
    L and 4 are linked
     
  12. ianmcd

    ianmcd

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    You would be better totally ripping that lot out and start from scratch, LN&E are constants (the hive doent need an E but the boiler and pump do).

    3 on Hive to Boiler L
    4 on Hive to Pump live
    No links anywhere

    Totally discard everything else and set Hive to Gravity HW
     
    Last edited: 26 Feb 2021
  13. Nathan Wicks

    Nathan Wicks

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    How do you mean ripping out?

    Unless I rip out the walls I can’t trace the wiring?


    How do I know what’s the boiler L and the pump L?
     
  14. ianmcd

    ianmcd

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    you will just have to follow them, I use a multi meter to ping them , but sorry no easy way with your pics to tell you what is where, just dont go by colours they mean nothing
     
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  15. ianmcd

    ianmcd

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    I have alerted @stem for you , he has a lot more patience than me , he might be able to help you
     
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  16. Nathan Wicks

    Nathan Wicks

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    Yeah I understand! Thank you for your help so far
     
  17. Nathan Wicks

    Nathan Wicks

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    Just a question to ask.

    Do I need to link the N or L to any other terminals? Or is that just for the timer motor on the old SM300?

    Or will I need to link to power the system boiler pumps?
     
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