On 13/01/2019 20:47, Harry Bloomfield wrote:
John Rumm explained :
The quick look I gave it appeared to suggest that. What I am not sure
of is how you would set the various parameters without also having
some kind of controller in there... What timer/programmer have you
currently got?

Just a basic electronic one, with battery backup, with an override until
next action, on for one hour when off on both CH and HW.

If it will work, the intelligence for setting it has to be in the boiler
itself, so it must signal the HW demand back to the boiler, via the
ebus. The boiler does have ebus terminals. It also has terminals for the
NTC outdoor sensor - Do you happen to know whether the NTC is a 10K or
100K?

I *think* its 10K, but I am by no means sure.

The manual for the boiler is here -
https://www.vaillant.co.uk/downloads...ual-876622.pdf


It has rather a lot of settings in there, monitoring options and fault
codes. Unfortunately I cannot find any mention of suitable extra
controls and options at all. As you suggested, there is no 'big picture'.

On mine all those kids of things can be set from the VR470, but I could
not do it from the boiler's internal display / interface alone. Hence
the suspicion that you would also need something like the VR350 to give
you the access to the settings...

(alternatively there is I believe PC software available to talk to the
eBus for configuration and reading current state etc - so you could
possibly "configure and forget" it that way).


--
Cheers,

John.

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