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  1. #1
    Join Date
    May 2002
    Posts
    9,564

    Grundfos Alpha Pump

    Sort of restricted on this site so I have to put this here...
    On this DP variable pump how does the piping look for mixed zones?
    Currently I've got radiant on a modulating three-way valve and a reverse return radiators.

    With the new boiler it's decoupled and the Supply House said go with the variable DP pump but what I think I can get away with piping doesn't look right...

    EDIT-- the second drawing with the multiple pumps is "right" to me.
    Last edited by sysint; 09-14-2011 at 11:16 AM.

  2. #2
    Join Date
    Feb 2009
    Location
    british columbia
    Posts
    94
    i would go with drawing on the right

  3. #3
    Join Date
    Feb 2009
    Location
    british columbia
    Posts
    94
    but we usually pipe dhw tank after decoupler

  4. #4
    Join Date
    May 2002
    Posts
    9,564
    The DHW is in the future--- However, are you aware this is a Variable Speed pump with internal differential pressure control?

  5. #5
    Neither one is optimum.

  6. #6
    The first one the wild rads will make the pump control impossible for the rest of the loop. Why not just Tee the rad returns back with the floors zones return and call it good?

  7. #7
    Join Date
    May 2002
    Posts
    9,564
    This is how I did it (originally from the old boiler) --- The difference is the baseboard was R/R. I could see making the baseboard pump the Alpha with R/R and ZV's on all the radiators doing whatever.
    Last edited by sysint; 09-14-2011 at 11:16 AM.

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