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Harmonic Noise from TT PE110

Paul Pollets
Paul Pollets Member Posts: 3,661
in THE MAIN WALL
We installed a new PE110 2 months ago and have recently replaced the defective MCBA board. Now the boiler is making a harmonic sound intermittently that is disturbing to the homeowner. Attached is a recording of the sound. Any ideas? The boiler is vented with 2" Centrotherm with less than 14 feet of sidewall venting.

Comments

  • Paul Pollets
    Paul Pollets Member Posts: 3,661
    Noise file

    Not sure this site will accept the sound file...
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,170
    Harmonics

    When does it make the sound? In DHW mode or CH?  Is it piped primary-secondary?  What size piping?
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Paul Pollets
    Paul Pollets Member Posts: 3,661
    Setup

    The boiler makes the sound during both DHW and heat modes. 1" P/S with Alpha pump on the secondary. 2" Centrotherm vent sidewall vented, about 12 feet.
  • Paul Pollets
    Paul Pollets Member Posts: 3,661
    The Fix

    TT just got back to me and said the fuel mixture needs to be adjusted, and gave me the fix and parameters for adjustment. Apparently the groaning sound is caused by a lean fuel mixture. TT wants to see a CO2 reading of 9.3% on high fire and 9.0-9.6% on low fire.
This discussion has been closed.

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