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no air vents

ryan
ryan Member Posts: 23
in THE MAIN WALL
I worked on a system today that we have been taking care of for ten years. The unit has a header with 8-1/2" lines going out to baseboard registers and no bleeders, no manual or automatic bleeders. As far as i can tell there is no way to bled system. Has a steel expansion tank. Homeowner has been there 40 years and never had a problem. Its very quiet with no air. How does it work?

Comments

  • rich_6
    rich_6 Member Posts: 10
    give me more

    give some more info on what the boiler looks like? what is the name and is there zone valves and what is the return line sized at
  • kevin
    kevin Member Posts: 420
    the steel...

    expansion tank is the clue. It serves as the air removal tool. If set up right and no auto vents added it will be great.kpc
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