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thermal boiler shock

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DKH
DKH Member Posts: 15
in THE MAIN WALL
I would appreciate comments and suggestions on the prevention of boiler shock when using multiple water temperature zones and the use of mixing valves on the radiant zones.Is a bypass from supply to return before(or after?) all the zone supplies adequate. thank you

Comments

  • Jeff Krawic
    Jeff Krawic Member Posts: 58
    Boiler shock

    I can speak for "Smith Boilers" and their recommendation for prevention of thermal shock. Use a "blend pump" as you suggest from the supply to the return and allow it to run as long as the boiler is active. Smith recommends a pump at 25% of the full ump rate. (Ex; 1 gpm per 10,00 btu input) Hope this helps.
  • Boonierat
    Boonierat Member Posts: 58
    Thermal Shock

    One of the best defenses I can recommend against thermal shock is "primary-secondary piping".
    It's just too natural a way to ignore. Protects the consumers investment.

    There was an error rendering this rich post.

  • Terry
    Terry Member Posts: 186


    Blend Pump idea is good. But rather than run cont. A Setpoint control could be used (i.e. Tekmar#150) to run blend pump when return temps fall to prespecified temp.

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