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.

pump reversal

bob young
bob young Member Posts: 2,177
looked at a job done by the local . ut ility [keyspan ] . small gas residential boiler 3 zone valves on supply connection . circulator on return. replacement pump installed pushing out of boiler return connection against zone valves in reverse direction. besides not working will it damage zone valves. installed about 3 weeks ago.


  • Big Ed
    Big Ed Member Posts: 1,117

    On the circulator water way there is a arrow to show flow direction.

    When one the zonevalves closes while another is calling ,it will create a hammer noise if the flow is incorrect......Damage no.
  • Weezbo
    Weezbo Member Posts: 6,232
    Also took a peek at a boiler with lots of pumps on header

    for some reason no heat into the field.Why not? well,you need to wire it so it turns the boiler pump off and on...Duh....:) my buddy put an extention on the header connected the two headers with a ball valve ,wired the boiler pump so it would actually go ,pulled all the other pumps out and made it happen for the guy.the sad part was the diy kept adding more and more pumps ??????????!heck if one dont work 4 's Gotta :))) sorry...i digress,oops.*~/:) um...i find your question interesting however pumping the water out of the return to the field isnt a really normal plan on oil or gas ,some electric can be done that way however for the most part it really has certain earmarks of creativity that needs to be discouraged. spot some one, who isnt going to create awe and wonderment how the thing Ever worked,a few dollars.
  • Another Problem

    with reverse flow through boilers is that the aquastat is situated in the flow of the supply outlet of the boiler. In reverse flow situations the cooler return water will continue to give the aquastat a false reading thus keeping the gas train on. The result will be operating temperatures in far excess of 200° F. Hope this helps.

    Glenn Stanton

    Manager of Training

    Burnham Hydronics

  • Dale
    Dale Member Posts: 1,317
    Edwards Boiler

    Just for grins make sure this isn't an Edwards Brand boiler, the pump is at the bottom but pumps away from the boiler, nice old boiler too, just gets you thinking.
This discussion has been closed.