zone valve - how to hook open (honeywell and Drayton 2 port valves)

[@tonyjarvis4970]

Thank you for posting this, it saved me a lot of effort. I fiddled with the Drayton valve for ages and could not get it to operate. The manual is not clear. Your video was quick, clear and to the point. Perfect. Cheers

[@da_great_mogul]

Is the hook open function only a temp measure? In keeping it hooked into place I suppose there's no way the motorised valve could be told to turn off the radiator circuit by the programmer at say 22:00 hrs?

[@thornhillplumbing]

Yes it's temporary fix to manually hold open the valve