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monoflo tees

D.ROSCHELLI
D.ROSCHELLI Member Posts: 4
in THE MAIN WALL
yes it is a large system with other buildings on it and has worked for years the way it is today.

Comments

  • D.ROSCHELLI
    D.ROSCHELLI Member Posts: 4
    old monoflo tees in heating system

    I have a building with a one pipe heating system and monoflo tees. The system has hot water in the mains but some of the radiators don't heat well and the colder it is the less heat. I think the tees are worn to the point that they don't work as well as they should. The system was installed in the 30's. The building is a two story school house but is now office space. Most of the tees are 1 1/2" to 2" any easy way to repair this.
  • ta finnegan
    ta finnegan Member Posts: 121
    Mono-flow

    Is the system piping arranged to pump away from the boiler?

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  • Zeb_2
    Zeb_2 Member Posts: 2
    AIR?

    Have you tried to bleed air from the rads. that are not heating?
  • D.ROSCHELLI
    D.ROSCHELLI Member Posts: 4


    The air is out of the system.
  • Steamhead
    Steamhead Member Posts: 17,344
    It might look that way

    but if the circulator is on the return, pumping toward the boiler and expansion tank, it may actually get in the way of the bleeding operation by inflating the little air bubbles remaining in the system.

    The sure cure is to repipe the circ so it pumps away from the air separator/tank connection, and out toward the system. This arrangement drives the bubbles back into solution and flushes them back to the separator.

    Get Dan's "Pumping Away" book for a more detailed explanation. Order it on the Books and More page of this site.

    I doubt the Monoflo tees are worn out. Unless lots of fresh water has been added over the years, there should be no rust or corrosion in there.

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  • Art Pittaway
    Art Pittaway Member Posts: 230
    Has the pump been changed?

    To often a pump with more head and less flow will wind up on these systems. See if you can check back on what the head and flow of the original pump was. If the pump runs out of poop it won't heat the whole building no matter where you put it. All the monoflows have to recieve sufficient flow to divert enough to each radiator.
    Good luck,
    Art
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