The Pegler Automatic Bypass Valve has a dial going from 0 (fully off) to 5 (fully on). What does it mean to have it set to 0 and then set it to 5, when it's connected to the usual flow and return pipes of a Combi boiler.
It lets water through when the pressure, marked in Metres ( or 0.1 bar) head, is across the valve. A htg engr will work out what to set it at for your boiler/system.
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