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Thread: Replacing cylinder stat with CS92 - confused by old connection

  1. #1
    Automated Home Jr Member
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    Question 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; 19th June 2021 at 09:13 PM.

  2. #2
    Automated Home Jr Member
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    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

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

  4. #4
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    Quote 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. 🙂

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

  6. #6
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    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!"

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