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Problems with shared return on new oil heating installation

melromelro Posts: 2Member
I'm really hoping someone can offer some advice. I recently had installed a new oil heating system. Its a large installation with 3 zones and water. All the zones have a shared return due to lack of space for individual returns for each zone, therefore a shared return for all zones has been installed. It now seems that when an individual zone is on that the water returning from the heated zone migrates through the return to the other zones which are off, causing the radiators in the zones that are switched off to heat up. My question is how can this be resolved?

Comments

  • Robert O'BrienRobert O'Brien Posts: 2,989Member
    Flow check on return
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  • Jamie HallJamie Hall Posts: 8,223Member

    Flow check on return

    before they join together to create the shared return. Slightly less effective, but will also work, is a flow check on the feed.
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • SteamheadSteamhead Posts: 12,040Member

    Flow check on return

    This.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
  • Big EdBig Ed Posts: 1,057Member
    You have a missed place return pipe . The zone that is split needs to be rejoined back to single pipe before its connected to the mutual boiler return ... Or throw in checks
    I have enough experience to know , that I dont know it all
  • Mike_SheppardMike_Sheppard Posts: 145Member
    edited April 17
    @Big Ed is right. If you split one zone the returns need to connect back together before entering the common return. Otherwise you will need check valves. But eventually check valves will fail.

    Two pictures attached from B&G system design manual.
  • melromelro Posts: 2Member
    Thanks very much for all your helpful replies. I would be interested to know why you think the check values will eventually fail?
  • Jamie HallJamie Hall Posts: 8,223Member
    sad experience..
    Jamie



    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.



    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • Mike_SheppardMike_Sheppard Posts: 145Member
    > @melro said:
    > Thanks very much for all your helpful replies. I would be interested to know why you think the check values will eventually fail?

    Because time is cruel and eventually everything fails. I’m sure they’d last a good long while though.
  • Big EdBig Ed Posts: 1,057Member
    edited April 19
    Adding a more complicated device to correct a simple solution just increases the odds of failure ....
    I have enough experience to know , that I dont know it all
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