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26th May 2022, 08:19 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

I've confirmed it's working correctly now. Sending the STATUS message with ch_enable set to 1 is what it needed. The demand control into terminal 4...

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26th May 2022, 07:32 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

I've just spotted an error in my code. I was sending the SLAVE_CONFIG message instead of STATUS. I'll give it another try later and hopefully that...

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54 replies | 6313 view(s)
26th May 2022, 07:13 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

Do you think I need to do anything with terminals 7-8-9 on my boiler? At the moment there is nothing connected but I wondered if I need to loop any...

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25th May 2022, 09:59 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

Just to be clear that's the 'terminal 4' demand signal.

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25th May 2022, 09:55 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

I've been trying this out but I'm having some problems. Whilst the loop is applied to the VR33 OT connections then the boiler works fine in response...

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54 replies | 6313 view(s)
20th May 2022, 09:22 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

No I'm using it to generate OT messages into the boiler (VR33 interface) e.g. set feed temperature and also to query data e.g. feed and return...

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54 replies | 6313 view(s)
20th May 2022, 08:06 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

I'm just using the circuit shown here https://ihormelnyk.com/Content/Pages/opentherm_adapter/opentherm_adapter_schematic_o.png and also the same here...

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54 replies | 6313 view(s)
6th May 2022, 10:42 AM

Vikings replied to a thread OpenTherm VR33 and Vaillant ecoTEC plus 428 in Heating Control

I've built up my own revised board now with the 'correct' optocouplers and it now works perfectly!! I can set the boiler temperature and read back...

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54 replies | 6313 view(s)

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Vikings
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Vikings
Automated Home Jr Member