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Viessmann 4 way bypass

Paul Pollets
Paul Pollets Member Posts: 3,656
Converting this home from gravity to circulation...we used a 4way mixing valve with a globe valve bypass, per Viessmann instructions. The water content of the system is 160gal with 15 radiators and 3" mains. I've never done a bypass on a 4way, but with all the issues surrounding condensation, the boiler is protected from thermal shock.

We're using a Vitogas100-35 for the heating plant.

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Comments

  • Constantin
    Constantin Member Posts: 3,796
    Fascinating...

    ... However, I'm surprised they opted for a VitoGas instead of a Vitodens given todays gas prices...

    Nice, neat work, as usual. Now that you've plumbed it this well, you'll never need to access it again in the future! :-P
  • Cosmo_3
    Cosmo_3 Member Posts: 845
    check,,,mate

    That is one expensive bacflow preventer you used. Just wondering, couldn't you get away with a Watts #9D, is that a Watts #6 you have? Do your local inspectors require that backflow preventer?

    Do not take that as a critisism, because yuo do very nice, clean work.


    Cosmo Valavanis

    Dependable P.H.C. Inc.
  • Paul Pollets
    Paul Pollets Member Posts: 3,656
    Options

    The owner's were happy with the cast iron option. I prefer mating a low mass cast iron boiler when coupled to existing cast iron radiators. There are no radiant zones attached to the boiler. Considering the cost of the renovation, there were certainly some budgetary restraints. Hence the VitoGas. This home has high DHW usage...the Vitotronic 200 and separate dedicated pump, will give very fast DHWTank recovery. The Vitodens would be significantly slower in this regard.

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  • Paul Pollets
    Paul Pollets Member Posts: 3,656
    That's

    a Wilkins...usually I use a Watts 009. RPZ's are code required in the state of WA on boiler feeds. We've built a bypass around the Caleffi PRV/fill valve to fill quickly.

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