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Master Circ pump + one for each zone?

pickncrew Member Posts: 13
I am a little confused by this video showing circulator pump replacement. Each zone has a circulator, so why is there one master circ pump in-line here? I thought you would only have one master circ pump if you were using zone valves but that doesn't appear to be the case here. Thanks...

<a href="https://www.youtube.com/watch?v=RFou8--DOWU">https://www.youtube.com/watch?v=RFou8--DOWU</a>


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
    edited February 2014
    It appears...

    The black circ is on the boiler loop. It circulates water thru the boiler when any zone calls for heat.
  • pickncrew
    pickncrew Member Posts: 13

    It seems redundant… haven't seen too many like this have you?
  • icesailor
    icesailor Member Posts: 7,265
    I/O Manuals:

    Do ya' think that is piped like the Weil-McLain manual calls for in a Primary Secondary piping scheme?

    Looks like another variation on that "Closely Spaced Tee's" theory.

    IE: Close is that it is in the boiler room. NOT 4 to 6 pipe diameters apart.