1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

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

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    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!
     
  2. Sponsored Links
  3. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    It's fine.
     
  4. dee-aye-why

    dee-aye-why

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks - any thoughts on the earth wires?
     
  5. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    All cables need to be earthed even if the appliance at the end is double insulated.
     
  6. dee-aye-why

    dee-aye-why

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    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

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    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

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks, appreciate it. I'll choc block them together in the back box.
     
  9. Sponsored Links
  10. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Do not use a metal back box.
     
  11. dee-aye-why

    dee-aye-why

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    Roger that. Plastic all the way. Gonna use a faceplate for a neater mount like this geezer too.
     
  12. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    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

    Joined:
    25 Apr 2017
    Messages:
    8
    Thanks Received:
    0
    Country:
    United Kingdom
    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

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,424
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Should be OK, although, tbf using those cover plates does help if you do have an annoying gap.
     
  15. Tony Sand

    Tony Sand

    Joined:
    28 Oct 2019
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    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
     
  16. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Sponsored Links
Loading...

Share This Page