Setting auto bypass

[scoobydo123]

Hi,

The boiler vaillant 428 I believe requires 1200L hr, pump is grundfos 15/60 on setting 3. Auto bypass is I believe a honeywell DU145 cannot find marking but has settings from 1-6. Have just switched on boiler and could feel both sides of the bypass warming up. Bypass was set to .1 but think the calculation it should be nearer .43? Anyway proceeded to adjust undoing screw on front didnt take notice and the cap came off and the indice so now I dont know where I am at! How can this be reset to the correct place for the reading? Have screwed in both directions but dont seem to come across a stop. When screwing clockwise after multiple turns I do feel what is like a spring but nothing more noticeable. Even if this is a stop where does the indice go?

Picture of set up attached

 

[scoobydo123]

Ha ha look what google found assume this is correct info?

//www.diynot.com/diy/threads/du145-bypass-valve-how-to-reset-the-dial.267969/

 

[fezster]

I had a faulty ABV (was passing way too much water regardless of setting), and I found it didnt stop regardless of how much I turned it in either direction. This may have been because it was faulty, but when I had a new one installed, I made sure I made minimal adjustments to it, as it seemed to be a very unintuitive and very sensitive piece of equipment!