Okay, I think I've got the jist.

Can I got back to a question that nobody has conclusivley answered.

Should my pump have any other way of tripping off/on other than the timer ?
Like I keep saying, the pump is running all the time the system is switched
on, and in either water-only & heat&water modes. I thought that in summer,
if I selected water-only then the pump need not run.

And finally my question about zone valve quadrant operational movement of
30°. Is that enough ?