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Condensate and condensation pump

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matt74
matt74 Member Posts: 9
edited April 2019 in THE MAIN WALL
I have 1 pipe system in a 15 unit apartment that was built in 1878 in St Paul MN and I have a issue with over condensation that will overfill the boiler and the boiler will shut off I have replacing steam vents inside the and traps and it still over condensate

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  • Steamhead
    Steamhead Member Posts: 16,904
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    What pressure are you running?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • matt74
    matt74 Member Posts: 9
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    Limit it set at 2 1/4 operation is set at 2 1/2
  • Jamie Hall
    Jamie Hall Member Posts: 23,452
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    Pressure is too high, but not hopelessly outrageous. The system will probably run just fine cutting out at 1.5 psi.

    That said, condensate pumps are an invention of the Devil, intended to annoy and upset people managing steam boilers. You need to modify the system, so that the pump, which will now be a boiler feed pump, is controlled by the level of water in the boiler, not the level in the condensate receiver. Then the level of water in the condensate receiver will control an automatic water feeder, but you will need to have an overflow line on the condensate tank to a handy drain somewhere.

    You also need to find out which safety is shutting the boiler off on an overfill. It's a good idea to do that, but it might be nice to know what is doing it.

    You may also have problems with slow condensate return. If you can, flushing any wet returns might prove helpful.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • JUGHNE
    JUGHNE Member Posts: 11,077
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    Your fresh water auto fill could be passing water thru or over reacting when the water level drops before water returns.

    As said above, your return lines could be slow causing the auto fill valve to respond.

    Your pump is controlled only by it's own float....not by the boiler??
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
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    Get a low pressure (0-3 psi), gauge from Valworx, and verify the pressuretrol is cutting out at setpoint.
    2.5 psi can push the water level in the wet returns up 70 inches, temporarily starving the boiler of water, causing any auto feed to activate, and blocking the air from escaping. If you ever have to replace the boiler, consider reconfiguring the returns to gravity.—NBC
    HVACNUT
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,633
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    Check that any water make up valve (manual or automatic) is not leaking by. If the boiler has a tankless domestic hot water coil check that as well. Check the simple stuff first
    matt74
  • retiredguy
    retiredguy Member Posts: 915
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    Did this problem happen after a boiler replacement or has it developed over time? What system updates have been done to this system?
  • matt74
    matt74 Member Posts: 9
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    Ever since they cut out the old gravity lead and added the condensation pump
  • matt74
    matt74 Member Posts: 9
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    Old school Weil mclain
  • Jamie Hall
    Jamie Hall Member Posts: 23,452
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    matt74 said:

    Ever since they cut out the old gravity lead and added the condensation pump

    This is not a coincidence...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • JUGHNE
    JUGHNE Member Posts: 11,077
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    Does anyone know why the pump was added; what problem was trying to be solved?

    Perhaps slow returns then. Maybe the thought was the extra reservoir/accumulator would put more water into the system as it boiled away.

    This boiler looks to be shorter than the original. Lower water line might have made some wet returns dry?
  • SeanBeans
    SeanBeans Member Posts: 520
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    LOL.. almost every steamer I see in Denver had a condensate pump on it