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circulation problem

Markus Member Posts: 9
could somebody help me with my circulation problem.
The black pump at the bottom center of the heating board doesnt circulate. She is running but not circulating any fluid. She also will get pretty warm after a while because there is no cooling from water.
This is the circulator for my back up propane boiler, main heat comes from Outdoor woodboiler. (Pump to the far right.)
I'm running 4 loops of baseboard convectionheaters (Haydon Supr Heat 1000)each loop around 25-30'000 btuh, and a DHW loop.

BTW good to see that Gary UK is now Gary US.
all the best from the NorthWest.....


  • Steamhead
    Steamhead Member Posts: 16,901
    This might sound elementary

    but do those circulator flanges have ball valves built into them? If so, are they open?

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  • John@Reliable
    John@Reliable Member Posts: 379

    Take plug out of pump center you should see it spinning.
    If that is moving pump is air bound, purge system.Looks like you should have some purge valves on system somewhere.
    Another quick way is to close one side to pump and loosen flange bolts to purge pump of air. Hope this helps!PS if pump is not moving I would replace w/new. Also being back up you should run it monthly just for this reason.
  • Markus
    Markus Member Posts: 9
    thank you, problem solved

    well would you believe that......???
    yes they do have ball valves and yes i was stupid enough not to notice. Many many many thanks...........

    all the best from the north west......
  • heatboy
    heatboy Member Posts: 1,468

    Pump on the right is wood boiler/HX pump. Next pump over is an injection pump from the HX to the system. The pump you are having issues with is the injection pump from your back-up boiler. Very clean piping (I check that kinda' stuff!). Is this purchased panel?

    1 - Is this a new installation? If it is, air may be your problem, although it looks self venting.

    2 - Are the zone valves open? Does the pump start from end switches off the valves or some other source? I ask since there is no control evident.

    3 - These are Grundfos isolating flanges on the pump. Be sure the slot runs parallel with the piping. I have seen this more than once.


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  • Markus
    Markus Member Posts: 9

    Thanks for your help too Heatboy. The problem was with the flanges and ballvalves, since i wasnt aware of them. as you can tell i am not a proffesional just a homeowner that wanted a real heating system.
    The panel was made by Tamas Hydronic in Calgary Canada. I think it is a real beauty and love to show it off. The pumps are controlled by a Tekmar 363. I wanted the system running for last winter but do to many delays with parts and stuff it didnt get that way. But it will now be ready for the coming winter.
    I would like to thank all the people on this site that helped me with choosing the right products and system. And hopefully next winter will be a little warmer in our Log home.
  • Mark Hunt
    Mark Hunt Member Posts: 4,909
This discussion has been closed.