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Hydronic Floor hot spot 110F surface

Terl22
Terl22 Member Posts: 5
in Radiant Heating
Just purchased a house this summer with hydronic radiant heating on the main floor. It seems to be working fine but I’m still trying to make sense of it. Tonight I noticed a hot spot in one area with surface temp of ~110 with the rest of the floor around 85-90F. Attached are some pictures of the setup. Any advice or guidance is greatly appreciated 


Comments

  • HVACNUT
    HVACNUT Member Posts: 6,324
    Pretty weird if they're all coming off the same tempered loop. Show the boiler piping. 
  • Terl22
    Terl22 Member Posts: 5
    Pictures attached. From what I understand. Anything without a zone valve on the manifold will heat whenever the indoor sensor is not at set point and the others will open based on the wall thermostats
  • Jamie Hall
    Jamie Hall Member Posts: 24,819
    You find A hot spot? Do you have an autofill on that system? I'm suspicious of a leak.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Terl22
    Terl22 Member Posts: 5
    Yes there is an autofill. I checked the basement below the hot spot and no sign of moisture
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    Possibly tube bunching where they eminate from. Looks like someone tried to do a quasi European design (constant circ, outdoor reset). Without seeing an IR picture, its hard to say. Got FLIR?

    There was an error rendering this rich post.

  • hot_rod
    hot_rod Member Posts: 23,367
    Any DHW lines in that area?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Terl22
    Terl22 Member Posts: 5
    hot_rod said:

    Any DHW lines in that area?

    Nope, this is in the middle of the room
  • Terl22
    Terl22 Member Posts: 5
    Mark Eatherton said:

    Possibly tube bunching where they eminate from. Looks like someone tried to do a quasi European design (constant circ, outdoor reset). Without seeing an IR picture, its hard to say. Got FLIR?

    If you look at the first picture, there are zones labeled Great Room #1 and Great room #2. Under this setup will Great room #1 get constant flow based on the indoor sensor?

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