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?
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.
If it is a SL98UH090V036C, make sure they removed the shipping bolt and washer from the rigid leg of the motor mount.
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.
Originally Posted by tommytuna
Here are some links to video/audio I just took:
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.