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Sorry - I got the clockwise and anti-clockwise the wrong way round. It meets an end stop when I turn it anti-clockwise. Is this setting "1"? The numbers increase when you turn it clockwise

I recently had a Honeywell DU145 bypass valve fitted, with the factory setting of 2 Using data from my boiler and my pump, I calculated that it needs to be set at 3.5. I loosened the locking screw as per instructions and was surprised that the black dial moves with the red control - not very...