Vaillant ecoTEC settings for use with vSmart and VR66 wiring centre?

[Matthew Butt]

We have a new Vaillant ecoTEC 624 boiler (installed in November), operating as a system boiler. It wasn't getting on well with our Honeywell thermostat, so we decided to get the vSmart thermostat and VR66 wiring control centre, which should work better with it.
One thing that seems to be missing from the installation instructions is the settings we need on the boiler once the VR66 and vSmart are up and running.
Should we set the boiler to the default settings or something specific? Or are the boiler's internal settings simply overridden by the VR66? It would be really useful to know.
Thanks!

 

[ShaunCorbs]

Wasn’t it set up when the vr was installed?

@king of pipes

 

[Matthew Butt]

The (Vaillant-approved) installer hadn't installed a VR66 before, and had been unable to find the information anywhere. He just reset the boiler to its defaults. We've actually had a Vaillant engineer out too, as the first VR66 was faulty (high-pitched noise like a cat deterrent, and not operating the valves correctly). He didn't have a clue about the boiler settings either. It's strange that Vaillant's own people don't have access to this kind of information either.
We've got the Vaillant engineer back tomorrow with the replacement VR66, so we'll ask again. I just hoped I'd get some info before he came in case he needs to get into the installer area of the boiler software where I can't go.

 

[ShaunCorbs]

I would say it needs to be set up but not 100% as I don’t fit that many king does so tagged him in

 

[king of pipes]

Your valliant engineer should be trained in these controls they can be tricky to configure

 

[Matthew Butt]

Your valliant engineer should be trained in these controls they can be tricky to configure

View attachment 36513

You'd think so, but apparently not. I think he might be able to phone their tech support people for instructions. Fingers crossed, and thanks.

 

[Matthew Butt]

Your valliant engineer should be trained in these controls they can be tricky to configure

View attachment 36513

Thanks, by the way, for the wiring diagram. It's the same as the one in the installer's manual. Interestingly, our installer contacted the Vaillant installer support team to check a couple of things, and they said the eBus connections should be combined at the boiler, not at the VR66 as shown in the diagram.

 

[Matthew Butt]

I've just had a reply from Vaillant technical:

"Both hot water and heating settings on the boiler should be set to maximum, as the vSMART is a weather compensator it will aotomatically adjust the boiler target flow temperature depending on the outside temperature."

I feel I've got somewhere, and it backs up what ShaunCorbs thought. Thanks for the input to both of you.

 

[fezster]

The vSmart thermostat uses ebus commands to control the flow temperature on the boiler, though you can limit the max flow temperature by adjusting the "radiator" dial on the front.

As Vaillant have said, your weather compensating thermostat will control the flow temp for heating. For the HW cylinder - it will force the boiler to 80 degrees during the HW cycle.

There is still some setup required to get the weather compensation working correctly, as there are a number of curves to select from depending on your home's profile.

 

[Matthew Butt]

There is still some setup required to get the weather compensation working correctly, as there are a number of curves to select from depending on your home's profile.

Thanks fezster.
How do we determine our home's profile for curve selection? Is it just a matter of what kind of heating, i.e. radiators? I notice in the Advanced Settings section of the vSmart app it's set our heating curve to 2.6 automatically.
Our vSmart is still in its "learning" phase for heating prediction.