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Discuss Vaillant 630 bypass question in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Frog67

    Frog67 GSR

    Evening all i have a technical question i hope you can help me with.
    I've been asked to quote to fit a Vaillant 630 system boiler on an S plan with 3 seperate zones, 2 x CH and 1 x HW

    The system comprises of 14 rads and a 42 x 18 indirect cylinder
    8 rads on ground floor (1st zone)
    6 rads on first floor (2nd zone)
    Total rads output = 24kw
    The 630 has a built in bypass but should i still fit an external one?.
    I'm concerned about an additional bypass causing circulation / cycling problems if the built in one opens as'well as an external one.
    Thanks
     
  2. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

  3. Last Plumber

    Last Plumber Plumber GSR

    I definitely would do yes.
     
  4. Last Plumber

    Last Plumber Plumber GSR

    The one in the Boiler is not big enough in my opinion.
    Not for an S plan anyway.
     
  5. Frog67

    Frog67 GSR

    Thanks, i must admit that not fitting one on an S plan doesn't seem right but the MI's state that an external one isn't required
     
  6. Last Plumber

    Last Plumber Plumber GSR

    I know but I think it's best practice.
     
  7. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    You wouldn’t get told off for it but for the sake of £30.00 and no call backs.
     
    • Agree Agree x 1
  8. Frog67

    Frog67 GSR

    Thanks fellas I'll go with your advice
     
    • Like Like x 1
  9. chris watkins

    chris watkins Plumber Top Contributor!!

    Can any one tell me why you need an external bypass with an S plan with a 630?
     
  10. Last Plumber

    Last Plumber Plumber GSR

     
    Last edited: Nov 15, 2018
  11. chris watkins

    chris watkins Plumber Top Contributor!!

    edit request
     
    • Like Like x 1
    Last edited: Nov 15, 2018
  12. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    I always fit em . Kop
     
    • Agree Agree x 1
  13. Last Plumber

    Last Plumber Plumber GSR

    I just deleted that message Chris. I was writing something different.
    Do me a favour and get rid of it so I can rewrite it will you.
     
  14. Last Plumber

    Last Plumber Plumber GSR

    Thank you Chris.
     
  15. Last Plumber

    Last Plumber Plumber GSR

    Sorry Chris, I'm not ignoring your question. I got distracted and then Question Time started.
    I'm busy today but I will come back to you soon.
     
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