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high efficiency with multiple problems long flue

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jdfinch
jdfinch Member Posts: 1
in Gas Heating

i have a high efficiency that was installed. constantly goes through pressure switches. and does kick on till there is a 20 degree differential. flue comes out end 2" for 12in 90's 12in then adapts up to 4 inches. travels 30 feet 90's travels 15 feet 90's travels 5 ft 90's up and out of the building. i did add a saddle on the 4" about a foot from the transition. it has 1"1/2 pipe down about 16 inches to a trap and empties into a bucket. just trying to stop the condensate from flooding the furnace and taking out the pressure switch. i need advice short of calling a company and having it replaced.

Comments

  • pecmsg
    pecmsg Member Posts: 6,856

    The IOM will have specific ways of running that vent and how to drain.

  • Ironman
    Ironman Member Posts: 7,884

    Unless that’s a 400k btu appliance, a 4” pipe is too large and will cause excessive condensation and venting issues.

    What size boiler do you have?

    How about posting some pics of the boiler and venting?

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    Mad Dog_2
  • hot_rod
    hot_rod Member Posts: 26,989

    The installation manual should have the venting sizing table. Lengths, fitting equivalents etc.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    GGross

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