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Siemens RWB9 + unvented megaflo/ heating questions

Discussion in 'Plumbing and Central Heating' started by stu550, 15 Feb 2013.

  1. stu550

    stu550

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    I am buying a flat that I am hoping to move into soon. It is was built in about 2004 so hopefully its not a bodge plumbing/ wiring job.

    It has a Siemens RSB9 that is controlling both the Heatrae Megaflo (Model DD170) and various electric heaters in each room of that flat. I can see no other timer or time clocks.

    I had assumed given it has the above immersion that they are using off peak electricity but I can see no other timer and assuming both elements are wired in I am not sure how it can work? Unless there is a manual switch in the cupboard for one the elements that would seem odd?!

    Also, in the user manual for the Siemens RSB9 it says at the top 'not suitable for control of immersion heaters'?

    I am also concerned it is controlling 5 electric heaters around the flat?!

    The manual says:
    Contact rating 6A (resistive) 2A (inductive). Total switching 10 amps

    Hope some of you can help me out on this!

    Thanks

    Stuart
     
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  3. bolshy

    bolshy

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    Perhaps the sparky forum (electrics) can help you better, not sure this is the best place for your post. As to your cylinder, there's nothing stopping you from installing independent timed control for the immersion heaters. Have you checked everything works?
     
  4. stu550

    stu550

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    Not moved in yet but assume everything works!

    I have looked again though and only the bottom element of the unvented tank is wired in - I presume to the Siemens RSB9.

    On the manual for the timer though it says not suitable for control of immersion heaters?
     
  5. matt1e

    matt1e

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    Its not suitable for direct control, but it may be switching a contactor
    some photos of the set up would be useful

    Matt
     
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  7. stu550

    stu550

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    Here is a photo... probably doesn't tell you much.

    How is a contactor wired in? It does make a clunk when the heating/ hot water is turned on...

     
  8. matt1e

    matt1e

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    That'll be the contactor switching in ;)
     
  9. stu550

    stu550

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    Buried behind the wall somewhere? Or could it be what looks like that fused spur thingy?!
     
  10. matt1e

    matt1e

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    It won't be buried in the wall
    It's more than likely fitted in the what looks like a consumer unit at the top of your pic

    Matt
     
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