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Dhw is on the left...That would be my guess as the water on the whole buildibg side of the plate will be at a temp that best suits heating which will be way too hot for dhw so I would assume it is a blending valve.
Looking at it without prior knowledge It is not obvious to me which parts serve which side ch or dhw but both appear to have temperature blending much like the units fitted on some underfloor manifolds.
On the page in my link in earlier post. But it doesnt tell you wgat the numbers are. Was about yo do a reverse google image search to see if I can find original image source thst might have that info.
Its not clear what is doing what or going where in the images as the pipework is stacked.
Not sure its a flow switch its on the building primary. I doubt tge dhw needs a flow switch in this set up as no instruction to fire or pump or divert required.
