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Thread: Evohome and OpenTherm Compatibility with Glow Worm Boiler

  1. #1
    Automated Home Lurker
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    Default Evohome and OpenTherm Compatibility with Glow Worm Boiler

    The following was posted in another thread but I suspect may have been lost in the noise.

    I am considering buying the OT bridge for my Evohome system, however I need assistance in determining if my boiler will be a goer. I have a Glow Worm Flexicom 30 SX. The following states that the boiler is unofficially compatible when using the correct VR33 module:

    https://myboiler.com/opentherm/opent...pable-boilers/

    Further reading from the below article suggests that the compatible module will be a AWB OPENTHERM MODULE 0020036768.

    https://myboiler.com/opentherm/vaillant-opentherm/

    Can anyone confirm either way from the below images of the boiler's PCB if the module is definitely compatible?

    20190616_182808.jpg

    20190616_182914.jpg

    20190616_182816.jpg

  2. #2
    Automated Home Guru
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    Default

    Hi,

    I have the Glow Worm Ultracom2 30SXI and I decided to try to upgrade to Opentherm based upon the fact that it appears to be an identical boiler to the AWB ThermoElegance 4 and the AWB 0020036768 Opentherm module is designed for the ThermoElegance 3 and 4 range of boilers. I'd seen the information on the myboiler.com site and this had triggered my interest so I took a look at the manuals for the AWB boilers and the Opentherm module. I purchased the AWB Opentherm module and it turned out to be a very simple job to install the card as all I needed to do was remove the plastic mounting frame that came attached to it as the card slid perfectly in a dedicated vertical slot for the card within 24V the controls section! The connections were simple; one plug pushes onto the X40 contacts on the control board and then the 24V connection is made to your Opentherm controller (I'm using the Evohome OT Bridge). Although your Flexicom boiler doesn't resemble either of the AWB ThermoElegance models, it does look like you have the necessary X40 port on your control board. I don't have any pictures of my installation, but I do recall that I had to remember to add the RT link (the 24V one I think) to get the system to work. Oh, and it's all working perfectly!

    Here's the installation manual for the AWB Opentherm module (yes, just 1 page ):
    AWB 0020036768 - 3.jpg

    Hope this helps.

    Dan
    Last edited by DanD; 17th June 2019 at 10:11 PM. Reason: Added attachment

  3. #3
    Automated Home Lurker
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    Default

    Quote Originally Posted by DanD View Post
    Hi,

    I have the Glow Worm Ultracom2 30SXI and I decided to try to upgrade to Opentherm based upon the fact that it appears to be an identical boiler to the AWB ThermoElegance 4 and the AWB 0020036768 Opentherm module is designed for the ThermoElegance 3 and 4 range of boilers. I'd seen the information on the myboiler.com site and this had triggered my interest so I took a look at the manuals for the AWB boilers and the Opentherm module. I purchased the AWB Opentherm module and it turned out to be a very simple job to install the card as all I needed to do was remove the plastic mounting frame that came attached to it as the card slid perfectly in a dedicated vertical slot for the card within 24V the controls section! The connections were simple; one plug pushes onto the X40 contacts on the control board and then the 24V connection is made to your Opentherm controller (I'm using the Evohome OT Bridge). Although your Flexicom boiler doesn't resemble either of the AWB ThermoElegance models, it does look like you have the necessary X40 port on your control board. I don't have any pictures of my installation, but I do recall that I had to remember to add the RT link (the 24V one I think) to get the system to work. Oh, and it's all working perfectly!

    Here's the installation manual for the AWB Opentherm module (yes, just 1 page ):
    AWB 0020036768 - 3.jpg

    Hope this helps.

    Dan
    Many thanks Dan. Very useful.

    I tried to look for an equivalent AWB boiler but it seems the Thermo Elegance is the only system boiler they produce, no versions of which seem to resemble my Flexicom. Unless anyone else can definitively confirm either way, I'm going to leave this for the time being as the refund policy for the VR33 module doesn't allow for it to be returned.

    TM

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