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STEVEGREENE
STEVEGREENE Member Posts: 3
in THE MAIN WALL
Just installed new hot water boiler. Can't get fins bled on 2 sections. 1 1/4" steel fin. 1 3' piece comming off 1 1/4" main 3/4" branch diverter tee. Other fed by 1" in and out. Not new to this. In trade 40 years. There are bleeders on the fin tube. Have bled several times. Got some air initially but still can't get fin to heat. My pump is on supply side and I have purge valves on returns. Have tried all the tricks at the boiler. Raise pressure , shut pump off and purge, etc. Opened to suggestions.

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  • Ironman
    Ironman Member Posts: 7,377
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    Put about 1/2 cup of Dawn dish washing liquid in the system.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    STEVEGREENEMark Eatherton
  • STEVEGREENE
    STEVEGREENE Member Posts: 3
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    Thanks. Does that break the surface tension ?
  • Ironman
    Ironman Member Posts: 7,377
    edited December 2016
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    Exactly.

    Monoflo systems can extremely difficult to purge.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.

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