Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Circulator pump location

Options
Temple89
Temple89 Member Posts: 4
in THE MAIN WALL
I got called out on a no heat call today. Turns out a couple zones need to be purged. These are two boiler piped together and it seems like one boiler is constantly on and doing all the work. The other reaches hi limit and doesn't seem as if its circulating. I think one circulator is in the wrong location and should be before the "Tee" joins the feed piping of the second boiler.I'm posting some pictures please let me know what you guys think.

Comments

  • SWEI
    SWEI Member Posts: 7,356
    Options
    Missing items

    at first glance:  Isolation valves, check valves, primary secondary piping/pumping, and probably staging controls.



    It looks like the factory-provided boiler circulators (at least one of them) are still on the return, with the two Taco pumps (presumably pushing into the distribution loop) then acting in series with the boiler circs.  Got a sketch?
  • Unknown
    Unknown
    Options
    patheic

    Of course the new boiler won't fire up..
  • Unknown
    Unknown
    Options
    patheic

    Of course the new boiler won't fire up..
  • hot_rod
    hot_rod Member Posts: 22,200
    Options
    parallel pipe

    is fairly simple. If they are connected to radiant or high mass rads, return protection may be needed. Fin tube or air handlers could be piped direct.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Temple89
    Temple89 Member Posts: 4
    Options
    Diagram

    Here's a sketch of the circulator locations. Zones go to fan coils and 3 small radiant loops. Boiler one constantly runs while boiler two reaches high limit and water doesnt circulate through. If I move the circulator on the feed of boiler one. And move it to the return of boiler two it should solve that problem? Also need to add spirovent and isolation valves.Let me know what you think thanks
  • Temple89
    Temple89 Member Posts: 4
    edited December 2013
    Options
    Diagram

    ..
  • Unknown
    Unknown
    Options
    nope

    Nope... did you really piped this system??? The pipe is undersized for the system..
  • Temple89
    Temple89 Member Posts: 4
    Options
    No

    Rjb, I was called there to purge a few zones. I'm trying to get him to fix this problem. You seem very knowledgable. What would you do?
  • RobG
    RobG Member Posts: 1,850
    Options
    Don't Know

    I don't know if it makes a difference with individual boiler pumps, but with multiple boilers and a single pump, I was taught to pipe in reverse return, so that's how I pipe all multiple boiler installations. That said, do it just like Hot Rod's diagram, but maybe in reverse return? (don't listen to rjb, he only seems to be able to offer criticism, not help).



    Rob
  • SWEI
    SWEI Member Posts: 7,356
    Options
    There are three pumps

    and two boilers, apparently of different sizes, and no hydraulic separation.  Time for a re-think IMO.
  • Unknown
    Unknown
    Options
    correct, SWEI

    Correct... pipes are undersized to begin with.. imo.. the larger boiler is large enough to handles the load.. don't need the improper piped secondary boiler.. homeowers here can't handle my criticism because they know so much more than me.
  • RobG
    RobG Member Posts: 1,850
    Options
    System

    I don't believe the OP is a homeowner, but a fellow tradesman looking for advice.The day you stop learning something is the day it's time to find a new career.

    Rob
This discussion has been closed.

Categories