Replacing cylinder stat with CS92 - confused by old connection

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  • therealfronty
    Automated Home Guru
    • May 2021
    • 140

    Replacing cylinder stat with CS92 - confused by old connection

    I was having a look in my wiring centre today to take a look at how the old cylinder stat was wired up (an L641A). I was thinking I could just replace these connections with the switched relay connections from a BDR91 bound for DHW control, but I'm a little confused by the wiring, anyone have any idea why the earth wire is connected to "C" in this pic...?

    20210619_114717.jpg

    Image 027.jpg

    Also on this wiring centre I don't know which terminals are normally open or closed - I assume the BDR91 can be wired across "C" and either "1" or "2", but the current wiring has me completely confused as it looks like the live/neutral is wired across "1" and "2", which I would have thought is the normally open and closed contacts, so how is the current flowing - is it flowing via the earth wire through "C"??? I think I might have to take the L641A apart because the manual says there is no earth, so I wonder what it's connected to?
    Last edited by therealfronty; 19 June 2021, 09:13 PM.
  • therealfronty
    Automated Home Guru
    • May 2021
    • 140

    #2
    Oh I think I have answered my own question, good grief, the earth is wired up to the common terminal.

    20210619_212120.jpg

    Image 028.jpg

    Comment

    • bruce_miranda
      Automated Home Legend
      • Jul 2014
      • 2307

      #3
      I was just going to say, looks like someone just used a 3 core flex. Ignore all normal colour coding

      Comment

      • therealfronty
        Automated Home Guru
        • May 2021
        • 140

        #4
        Originally posted by bruce_miranda View Post
        I was just going to say, looks like someone just used a 3 core flex. Ignore all normal colour coding
        Yeah I ended up doing the same when I wired in a BDR91. 🙂

        Comment

        • bruce_miranda
          Automated Home Legend
          • Jul 2014
          • 2307

          #5
          The do sell coloured sleeves for a reason :-)

          Comment

          • therealfronty
            Automated Home Guru
            • May 2021
            • 140

            #6
            The wife wonders why I never throw anything out, "Ooooh I think I've got an old bit of wire in the garage that'll do that.... voila!"

            Comment

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