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Lochinvar Induction Fan Puzzle

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ced48
ced48 Member Posts: 469
I have a 5 year old Lochinvar WH55 that has developed an interesting habit. When the outlet temperature reaches 150 degrees on a DHW call, or running in service mode, and hitting that temperature, the induction fan begins to do a little whistling, and slight air rushing sound-Increasing the pump speed, thus lowering delta-t, stops it, as does covering the side air intake. Any ideas on this one?

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  • DZoro
    DZoro Member Posts: 1,048
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    What do you have for gas piping? Is your domestic water outlet set for 150*?
  • ced48
    ced48 Member Posts: 469
    edited February 2018
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    Black-I don't understand what you mean by my domestic hot water outlet. My tank is set at 125 degrees.
    Dennis said:

    What do you have for gas piping? Is your domestic water outlet set for 150*?<

  • DZoro
    DZoro Member Posts: 1,048
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    Sorry my bad, what is your max temp for the boiler set at?
  • Ironman
    Ironman Member Posts: 7,379
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    How long since cleaning and maintenance was done?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ced48
    ced48 Member Posts: 469
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    I just cleaned the heat exchanger, burner, and checked combustion levels. I also replaced the fan gaskets. The boiler was more or less clean, little bit of debris.
    Max boiler 180-
  • DZoro
    DZoro Member Posts: 1,048
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    Was it doing it before you did the maintenance? Double check all the bolts make sure everything is tight.
  • ced48
    ced48 Member Posts: 469
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    Yes, that why I did the maintenance-
  • delta T
    delta T Member Posts: 884
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    is this a new problem, or has it been doing for a long time? Seems to me you need a combustion analyzer to tune the combustion a bit. After 5 years, even if it was set up perfectly on install, it most likely needs a little tweek on the combustion settings. Do you have steel pipe for the gas supply all the way to the unit, or is it connected with a short flexible gas supply?
  • ced48
    ced48 Member Posts: 469
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    Newish problem, it's minor-I have an analyzer. Propane- Co2 10.6 Co 75 high fire. Low fire Co2 10.6 Co 22-Steel pipe, no flexible connector-
  • Ironman
    Ironman Member Posts: 7,379
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    Did you clean the water side? If not, I'd get some Fernox boiler cleaner and run it through and flush the system.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ced48
    ced48 Member Posts: 469
    edited February 2018
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    No, only the fireside-Is this difficult to do?
  • Ironman
    Ironman Member Posts: 7,379
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    No, just follow the pictorial instructions on the can. Obviously, you have to put it in the system with no pressure on it.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ced48
    ced48 Member Posts: 469
    edited February 2018
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    Bob-I just got the water some quality numbers from our town water department. To me, they look real good. Chloride 23ppm, pH 8, Chlorine .68 ppm, TDS 56-74 , and hardness 35.7ppm
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,629
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    Is not the Co2 of 10.6 pushing it for propane? Seems high
  • ced48
    ced48 Member Posts: 469
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    10 .0 to 11.0-
  • Henry
    Henry Member Posts: 998
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    BTW you need 140F in your tank to prevent legionella!