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Replacing Danfoss RX-1 with Honeywell BDR91 to Worcester Bosch Greenstar

Discussion in 'Plumbing and Central Heating' started by dee-aye-why, 25 Apr 2017.

  1. dee-aye-why

    dee-aye-why

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    Hi folks,

    Thanks for taking a look here.

    We have a Worcester Bosch Greenstar 30CDi Combi boiler, and a Danfoss RX-1 unit as relay to it.

    Existing Wiring:

    Existing Wiring.png

    From what I can work out from the wiring guides for the Honeywell BDR91 and the Greenstar, I need to do the following:
    New Wiring.png
    I believe I've got that right, however unsure what to do with the earth wire(s) - these are currently connected to a terminal in the corner of the RX-1's mounting plate, do I:

    a) Connect them each to their own separate terminal block to terminate;

    b) Connect them to the same terminal block, joining them;

    c) Fit a back box for the BDR-91 that has a terminal connection for earth, and connect them to that;

    d) None of the above (please advise!)

    Any glaring errors? I'd be really glad of your help.


    Docs:

    RX-1 Wiring Diagram - http://assistyou.danfoss.co.uk/PCMPDF/RX1.pdf

    Greenstar Wiring Diagram to controller is page 49 of https://www.worcester-bosch.co.uk/files/troubleshoot/gas_wiring-guide_smaller_3.pdf

    BDR91 Wiring Diagram is page 4 of http://www.honeywelluk.com/Documents/Installation-Guide/pdf/bdr91-instal-50034510-uk07r1009.pdf

    Thanks!
     
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  3. Dan Robinson

    Dan Robinson

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    It's fine.
     
  4. dee-aye-why

    dee-aye-why

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    Thanks - any thoughts on the earth wires?
     
  5. Dan Robinson

    Dan Robinson

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    All cables need to be earthed even if the appliance at the end is double insulated.
     
  6. dee-aye-why

    dee-aye-why

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    Sure. Call me thick, but which of the options in my post should I be using to do that? Connect the earths together, or to a back box, or?
     
  7. Dan Robinson

    Dan Robinson

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    Tricky from your drawing, but assuming the bdr is betwixt boiler and fcu, the just join the earth's with a butt connector in the bdr.
     
  8. dee-aye-why

    dee-aye-why

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    Thanks, appreciate it. I'll choc block them together in the back box.
     
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  10. Dan Robinson

    Dan Robinson

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    Do not use a metal back box.
     
  11. dee-aye-why

    dee-aye-why

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    Roger that. Plastic all the way. Gonna use a faceplate for a neater mount like this geezer too.
     
  12. Dan Robinson

    Dan Robinson

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    Hhhmmmm. Some at Honeywell have had many giggles over that person's video.

    A text book example of how not to install honeywell products.

    I am confident his last comment is a direct result of Honeywell contacting him. ;)
     
  13. dee-aye-why

    dee-aye-why

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    Heh. You reckon it would fit reasonably flush to the existing pattress then?

    2017-04-12 08.44.06.jpg
     
  14. Dan Robinson

    Dan Robinson

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    Should be OK, although, tbf using those cover plates does help if you do have an annoying gap.
     
  15. Tony Sand

    Tony Sand

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    Hi,

    Did you get Honeywell evohome up and working with your Worcester Bosch Greenstar boiler? I am looking at doing something similar but I am reading that they might not be compatible and that Opentherm wouldn't work.

    Any guidance is much appreciated!

    Cheers,
    Tony
     
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