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2 line system for 2 furnaces

Dukeofoil Member Posts: 1
Can anyone help with a diagram of  how a dual furnace system with return lines should be plumbed. Check valve location...


  • mattmia2
    mattmia2 Member Posts: 9,734
    I assume you mean hydronic boiler? Primary-secondary or with a hydraulic isolator is by far the best way to do it.
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    I think he means oil lines.
    If so, no check valves by code. You can look in the Suntec manual for proper procedure.
    Better would be a competent tech who knows the proper way (code), has the tools and fittings.

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