Vikings
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Join Date: 25th January 2021

Last Activity: 20th May 2022 09:22 AM

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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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48 replies | 6055 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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48 replies | 6055 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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48 replies | 6055 view(s)
26th April 2022, 08:24 AM

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

Unfortunately it turns out he is in Ukraine and unable to supply these at present for obvious reasons. He was kind enough to refund my payment right...

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48 replies | 6055 view(s)

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Last Activity: 20th May 2022 09:22 AM

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