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Heat stops working except 2 rooms.

danitheplumber
danitheplumber Member Posts: 87
in THE MAIN WALL
Have a customer who has 2 zone hydronic heating, 1st floor and basement. Basment has a leak so they isolated but now 1st floor will stop heating except for two rooms closes to the boiler and after bleeding system will heat all rooms for a week and then stop except for those two rooms near the boiler. It has 2 supply but three returns. Any suggestion?

Comments

  • danitheplumber
    danitheplumber Member Posts: 87
    It's baseboard heat 3/4".
  • bmwpowere36m3
    bmwpowere36m3 Member Posts: 512
    Sounds like the zone with the "leak" is not isolated from the other if bleeding cures the problem...
  • danitheplumber
    danitheplumber Member Posts: 87
    Yes but then why wouldn't it continue to leak?
  • Jamie Hall
    Jamie Hall Member Posts: 25,668
    One would think it would -- but is it possible that it is piped in such a way that the side with the incomplete shutoff is slightly below atmospheric pressure?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    danitheplumber
  • Paul48
    Paul48 Member Posts: 4,469
    edited January 2016
    What means of air removal do you have? How is the split loop balanced? It still leaves you to figure out how the air is getting into the system.
  • danitheplumber
    danitheplumber Member Posts: 87
    The first floor had 1 feed and two returns so it must tee off somewhere up satirs. Someone disconnected one of the two returns and connected to the unused third zone with a shyt off and boiler drain so they could force bleed it with city pressure.

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