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Old 03-24-2020, 01:08 PM   #1
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Rumbling sound on Carrier AC start-up ?


Hello to all,

My brother had 2 carrier units [5 ton/flr 1 & 3 ton/flr 2] for both Heat & AC installed in Sept 2019. Both are single speed compressors and everything from heater [NG], evap coil, air handler, plenum/etc were all replaced. The unit in questions is the 3-ton that services the upstairs

Over the last 7-10 days, upon turning on the upstairs AC, he has heard a loud rumbling sound for about 15 secs from start-up, then it seems to dissipate and smooth out. His son's room is right under the unit and he was over w his kids Saturday. When he turned on the unit, he said the wall kind of vibrated while the 15 second rumbling took place. My brother has heard it 3 times in 7-10 days, but he has to be in the vicinity of area to hear it.

Does anyone have any thoughts on what this could be or what he can do to determine the cause? He is VERY mechanically inclined. He called the company that installed the units, but his wife did not want anyone coming into the house due to the obvious virus issues.

If you have any questions, pls let me know and I will ask him.

thanks
tstex
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Old 03-24-2020, 05:18 PM   #2
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Re: Rumbling sound on Carrier AC start-up ?


Correction, My brother "has" 2 carrier units....
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Old 03-24-2020, 08:12 PM   #3
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Re: Rumbling sound on Carrier AC start-up ?


It could be the ducting expanding as it gets pressurized. That's normally a problem from day one but could be aggravated by using a different filter than usual or a plugged one needing replacement. Sometimes a filter gets pulled into the return air and causes things like this (where filers are in the RA grills).

Have him check by using the fan switch on the thermostat to start the fan while the system isn't calling for anything, just to see if starting the fan creates the noise. Might be a bad bearing on the blower. Or something got sucked into the blower and it's out of balance but smoothing out at higher speeds. Blower fan cage may be loose. Lots of possibilities.

Worse case is a scroll compressor getting ready to fail but that noise would be coming from outside.

Last edited by surferdude2; 03-24-2020 at 08:27 PM.
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Old 03-24-2020, 08:52 PM   #4
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Re: Rumbling sound on Carrier AC start-up ?


See my response to your post on that other forum.
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