On 13/01/2019 10:01, Harry Bloomfield wrote:
on 12/01/2019, John Rumm supposed :
Not sure you can really call it a limitation of the design - at least
they provide the facility in the first place, unlike many.

.All it would need to enable a split temperature, is 2x call inputs for
heat instead of the single one it has at the moment. Plus the two
temperature settings in the software, to replace the single temperature.
A fairly simple fix at the design stage.

Oddly the older version of the 400 series had the separate temperature
knobs on the front, although I also have vague memories of there being
reported problems using weather compensation on those. So perhaps they
"fixed" it by going to the system used on the 600 series.

Needless to say that precludes the system running Y plan with the valve
in mid position, and so favours modern fast recovery cylinders. (if
you program CH and DHW to be active at the same time, it squeezes
reheats of the DHW in between periods where the CH is satisfied
(perhaps with priority to the DHW)

That would not usually be an issue here. The DHW is usually brought up
to temperature in less than 20 minutes. 20 minutes with no CH input
would not be noticed.


--
Cheers,

John.

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