You are a good human !
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Heard back sounds like an engineer visit to see what is wrong. They suspect it’s a firmware issue, but in what bit they could’ve say Appreciate the help here. I did take delivery of the myVaillant Gateway and the VRA42 adapter board. I wonder if it is worth installing or get the service engineer to do it while he/she is here given how mch this is going to potentially cost.
Is there a thread here on installing the gateway, not clear where i should mount the VRA42
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The VRA42 power supply board is not compatible with your Arotherm Plus, just return it.
The gateway must be powered via a 5V DC adapter, or USB to DC barrel cable.
Thanks. It’s confusing as reading around i was led to believe i needed it. I have the gateway, DC power adaprer and cabl. They aren’t clear on hooking it up.
Not sure what the cable in your photo is for; it may be a way of powering the device via a 5V header inside the VWZ AI controller or VR 71 wiring centre? I’ve not seen one before.
My gateway is connected to an ebus header in my wiring centre using standard 2-core 1.5mm cable, with the gateway end terminated using the small green connector in your photo.
I understand now, this is what came with. What i need is where to buy the correct cable to connect the gateway to the bus connector. I’m finding vaillant really frustrating in this regard not making it easy to get the correct parts. Speaking to Vaillant tech support i need a cable that connects into the bus connector on the VWZ AI, and takes the bus input from the heatpump, and that connects to the gateway.
Going into the bus connector I have 2 off 2 core cables, 2 cores into positive, two cores into the negative. To connect my gateway i can just wire in my additional cores from the gateway cable into that? I don’t like doubling up on terminals, i think the tech support guy was suggesting there’s a splitter cable available to plug in from the gateway and the heatpump.
That photo is maybe old, but it shows VF1 still connected… (unless you have reconnected prior to engineer visit)
Old photo VF1 is disconnected now. So is it just a case of connecting the gateway cable cores into the same terminal block connected to ebus?
Yes, just connect it to the ebus terminal. I have a junction box on the wall where all units ebus cables are joined together. Polarity does not matter.
Sorry for double checking! Yes ebus line can be conntected anywhere you have ebus, either existing terminals or an external junction box
Cool, Wagos it is then. They will fit in the interface unit. Appreciated
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Just to check, this is how I’m going to wire it up.
Once my junction box and wagos arrive. Also will update after the Vaillant engineer has been in case anyone else has similar issues
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Looking good!
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One more (daft) question. It’s ok to do the rewiring while the power is on. I assume i will get error messages as soon as i disconnect the bus connector, but once I’ve rewired it and reconnected the bus connector just hit reset, same as when i disconnected VF1?
I’d power down, just to be on the safe side.
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Just the heat pump interface module or also the outdoor unit with the main isolator?
Shut the system down via the Sensocomfort controller menus, then power everything down via switches and isolators.
Update as to what was happening having had the engineer out. Since I don’t use Time control. Just the setback temperature, in the control menu Zone 1 i had set it to off instead of manual. Now both my sensocomfort and the heatpump interface module agree on the target flow temperature and everything is running much more gently with no massive overshoot. Thanks for the advice, learned a lot.
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