2 day old Lennox SLP98 - slight buzz/whine from blower? normal?
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  1. #1

    2 day old Lennox SLP98 - slight buzz/whine from blower? normal?

    Hi there - we just had a 90k btu Lennox SLP98 with Icomfort Wifi installed. Very impressed thus far bit have a question about noise. Previous luxaire furnace was single speed and we ran blower all time. It was pretty loud but a low frequency white noise you get used to.

    We keep the Lennox fan set to on and it blows a slow steady 600 cfm. Everything is so quiet in the house at this speed but the motor,makes a slight buzz/whine that I did not expect. It is faint but definitely noticeable since it isn't low freq. It seems to ramp up as the blower ramps up (I tried adjusting recirc cfm to 700 and 800 in comfort).

    wondering if these high end motors do make some sound or should it be virtually silent?

  2. #2
    I should add the sound has a slight oscillation to it which is what makes it noticeable. If it were a steady sound it would be unnoticeable (kind of like old furnace).

    appreciate any advice on this. I will have contractor back but i am fairly certain they will try to tell me this is 100% normal.

  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    If it is a SL98UH090V036C, make sure they removed the shipping bolt and washer from the rigid leg of the motor mount.
    If more government is the answer, then it's a really stupid question.

  4. #4
    Thanks - I will have another look at that when I get home. I presume the install manual would tell me where to look?

    I did remove filter and observe blower shutting down and ramping up. Definitely coming from blower area. I did see what appeared to be a counter weight on one of the blower wheel fins. I could see the wheel moving very very slightly and almost like the oscillation coming from that counterweight spinning around. Didn't want to touch it as I assume it is factory balanced like a tire/rim would be?

  5. #5
    Quote Originally Posted by tommytuna View Post
    Thanks - I will have another look at that when I get home. I presume the install manual would tell me where to look?

    I did remove filter and observe blower shutting down and ramping up. Definitely coming from blower area. I did see what appeared to be a counter weight on one of the blower wheel fins. I could see the wheel moving very very slightly and almost like the oscillation coming from that counterweight spinning around. Didn't want to touch it as I assume it is factory balanced like a tire/rim would be?
    Just verified that shipping bolt was removed.

    Here are some links to video/audio I just took:

    http://sdrv.ms/YM7CWJ
    http://sdrv.ms/YM7ExW
    http://sdrv.ms/YM7FBY
    http://sdrv.ms/YM7J4J

  6. #6
    Join Date
    Jun 2011
    Location
    New Braunfels, TX
    Posts
    87
    The video show a 4th leg on the motor which I believe is the "shipping" bolt connection. I would get the installer back out there to verify that it was removed properly. Don't do it your self. Warranty issues will ensue if you do Your contractor should be able to tell you if the sound is normal or not (hard to hear from the video). One of the biggest problems on these new systems is that they are too quiet, ie you are hearing things that are normally masked by louder airflow, noisier motors, ect...
    Ask your installer is about the best solution we've got for you.

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