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Maniflow system

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Spag74
Spag74 Member Posts: 16
My friend just separated a one pipe maniflow tee system bc radiant heat was causing uneven heat issues. So he decided to divide the maniflow system into 2 separate zones. Is it wise that he ran a maniflow tee for second floor in 3/4” HeatFlex PERT tubing that’s supplying 5 cast iron radiator's? If not what would the heating forum recommend or give opinions 

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  • neilc
    neilc Member Posts: 2,716
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    monoflow ?

    friend devided one zone system into a 2 zone system ?

    how is controlling zones? valves or 2nd circ?

    what's not working?
    known to beat dead horses
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,169
    edited December 2022
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    Dead men did a ton of mathematics to figure out how to get a one pipe monoflo system to be balanced and heat evenly. Pipe size, Branch size, Pressure drop and some other factors. So by cutting that into pieces, your friend needs to understand the whole picture and all the math that goes into it, then recalculate that math to the new design. If that was not considered, then it probably won't work. But he may get lucky :):):):):):):) HA HA HA

    Recommendation is to make the second floor a separate zone with separate supply and return back to the boiler room. Perhaps a parallel direct return system or a reverse return design.

    Leave the MonoFlo design alone just cap off the unused branches and hope for the best. If you are capping off 5 branches (10 pipes total) then you may need to add bypass pipes on at least 3 of them.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,169
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    Is this the same friend as the customer with this problem? https://forum.heatinghelp.com/discussion/186771/divert-or-not-to-divert#

    If this is 2 different people, there must be a ton of MonoFlo systems in your area, or you are just too lucky to get two systems with the same problem. You will be the diverter tee go to guy in your town.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • Spag74
    Spag74 Member Posts: 16
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    Yes 1 & 2 floors each are on a monoflow tee with separate supplies,returns back to the boiler and recirculating pumps for each floor 
    Will the 3/4” pert pipe get the 2nd floor heated as good as copper or black pipe
  • Spag74
    Spag74 Member Posts: 16
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    Ed 
    Its the same one, he just finally did it on his own and I was just checking to see if he did it correctly bc the return temp was only at 130* should be at 160*
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,169
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    So, Is this still one thermostat?

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • Spag74
    Spag74 Member Posts: 16
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    No each floor has own T-stat
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,169
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    I guess the better question, "Is the problem solved?"

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • Spag74
    Spag74 Member Posts: 16
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    I guess in a way but temp gauge says it’s only 120-130* for 2nd floor return water back to boiler
    Any ideas?
  • mattmia2
    mattmia2 Member Posts: 9,963
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    Are the emitters heating? Does the thermostat get satisfied as the return water temp is still climbing? If so it is working but you need to protect the boiler from the low return water temp.