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abv

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    Tower ABV (ABBV1)

    Hi, I have a Worcester Bosch Greenstar 32 CDi Natural Gas boiler. The system is fitted with an external Tower Automatic Bypass Valve (ABBV1). I need to work out what setting (1-6) to adjust the external automatic bypass valve to. I can't find the minimum flow rate for the central heating...
  2. W

    Auto Bypass Valve - Use top of indirect cylinder coil as the return?

    I need to add an ABV but there is no easy access to a return pipe, is it acceptable to bypass to the top of the coil (indirect cylinder) creating the bypass loop via the cylinder coil to the return?
  3. S

    ABV always flowing, Smart valves and overheating boiler

    Just in case anyone has some ideas to point me in the right direction! The system: Vaillant EcoTec 418 system boiler with unvented tank. S-plan (2 zone, CH and HW). Grundfos 3-speed pump (set to 2). Recently added smart valves (Drayton Wiser) to 5 out of 9 rads, so boiler load is reduced (all...
  4. W

    Vaillant internal ABV question - broken?

    Hi, First post so please forgive me where I go wrong. Wondering if anybody has some detailed knowledge about a suspected bypass valve that is not working as I expect it to. To elaborate: I have a Vaillant Ecotec 637 boiler, with an S-plan layout. Large 5 bed, 3 bath detached, decent...
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