Automatic bypass valve circuit

29 Jan 2006
Reaction score
United Kingdom
Can anyone advise me please? I'm installing my own open-vented, Y-plan CH pipework and have just discovered I need to incorporate an automatic bypass valve circuit. As far as I understand it, it is just an ABV on 22mm tube at some point between the flow and return from the boiler. For convenience, I would like to put it after the pump between the mid-position valve inlet and the return from the cylinder. Would that be OK? If it is placed at the highest point, will I need to include an air vent in addition to the one on the 28mm cylinder inlet?
All help gratefully received.
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SOunds ok but follow your boiler mfrs instructions which vary.
You need an air vent if the pump, or gravity, wouldn't push air through to the highest point.
Thanks Chris - Boiler instructions just say bypass must be at least 1.5m away. Cheers

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