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Old 04-08-2014, 11:27 AM   #1
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Noisy compressor


In one bedroom where it is right next to the air conditioner compressor which sits outside on a concrete pad, I can hear the compressor hum pretty loudly even with all the windows shut.

I don't remember if this has always been the case. It's a guest bedroom I honestly don't remember it being this loud but I rarely use that room so can't say for sure.

I know my units are old and may be time for replacement, but it works and cools just fine.

Here are the model & serial numbers, and not sure how old. It was installed by a previous owner.

HANDLER: LENNOX Model CB30M-31-1P Serial 5899K 5321

COMPRESSOR: LENNOX Model HS27-030-1P Serial 5899L 61774

Are these old? Is the noise due to old age, or I need to find a way to insulate the sound? What can I test or try to figure out which way to go?

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Old 04-08-2014, 01:08 PM   #2
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Noisy compressor


Made in 1999 so they are not young or real old. Those don't usually get louder with age but it should be checked by a Pro. Freon level needs checking etc. Usually I sit them on some rubber to absorb the vibes. If it is low on Freon the compressor can get damaged and your cooling goes down and elec goes up.

15 yrs use in Miami is LOTS and you should budget for new ones but some of those Lennox units can easily go more than 20 yrs. Get it properly checked and it may last another 5 yrs.

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Old 04-08-2014, 02:26 PM   #3
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Usually load hum or buzz is coming from the contactor.
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Old 04-08-2014, 09:48 PM   #4
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Thanks so it's 1999, 15 years.

Is there some lubricant or something I can apply to the fan to make it better?

I also read about a blanket. Is that worth a try?

Seems to me the noise is the fan humming from the top side of the compressor.
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Old 04-09-2014, 10:01 AM   #5
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At 15 yrs old the fan motor is worn and in your climate has several yrs more wear than the average unit. Probably needs a new motor and most of them are sealed and non lubricateable. Post a video on U Tube with the sound of it. Don't know about the blanket.
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Old 04-09-2014, 09:49 PM   #6
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About the blanket:
I've got a 13 SEER Goodman with Copeland scroll and a cheap stamped fan. With a Rheem 68-23427-26 blanket on it (fits 1.5-3 ton Copeland) I can barely hear the compressor because the fan is louder than the compressor. I'm not sure what it would be like if I had a quieter fan, but my compressor is no longer a factor in outdoor noise.

Also, make sure it's the outdoor unit you hear and not the lineset transferring vibration to the house.
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Old 04-10-2014, 10:40 AM   #7
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Quote:
Originally Posted by yuri View Post
At 15 yrs old the fan motor is worn and in your climate has several yrs more wear than the average unit. Probably needs a new motor and most of them are sealed and non lubricateable. Post a video on U Tube with the sound of it. Don't know about the blanket.
OK I will record a video and see if I can get it up to youtube.

Thanks.
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Old 04-11-2014, 12:08 AM   #8
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yuri,

here are two youtube videos.

the first one is the noise I hear when standing inside the room looking at the compressor outside.



the next one is the noise made by the compressor outside. I deliberately move around the unit, up and down, so you can hear the difference. You can also see the concrete pad the unit sits on is not touching the building structure.



To me it sounds like the fan on top is the most noisy.

Any advice or comments would be greatly appreciated.
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Old 04-11-2014, 10:09 AM   #9
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That does sound like the fan bearings.
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Old 04-11-2014, 10:17 AM   #10
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Does that mean a sound blanket would not work?

Any other thing I can try? Lubricate some parts?
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Old 04-11-2014, 10:38 AM   #11
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You will need to replace the motor.
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Old 04-11-2014, 01:26 PM   #12
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hmmm...if I need to replace the motor, should I simply replace the entire compressor? It looks like the compressor is essentially 90% the motor?
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Old 04-11-2014, 04:35 PM   #13
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Miamicuse:

The entire outside unit is called a condenser. Inside it sits the compressor and on top is the condenser fan motor. What exactly is the problem? From the looks of it, just the condenser fan motor is the problem. Those are around $100-$200 and an easy DIY swap. Are you saying the compressor inside is making the noise?

Replacing the entire outside unit will also mean replacing the evaporator inside your home. You are looking at many, many thousands to replace the entire thing.
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Old 04-12-2014, 10:29 AM   #14
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wheelsup I got my terms mixed up.

I meant the condenser unit outside the house, not the inside air handler unit. The inside unit is fine when it runs all I hear is the air being sucked in and if I close the closet door it's fine.

The outside unit is one that when I am in one room even with windows closed I thought it was a plane flying over.

So I just need to look up the make & model of the fan motor and replace it? No need for any sound blanket or dampening feet etc?
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Old 04-14-2014, 10:30 AM   #15
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Hi after searching online I found a place that carries the motor.

I think it is this one:

http://www.acfurnaceparts.com/search...se&category=24

68J97 Lennox - Fan Motor

Your Price: $276.40

Is this right? Do I need anything else? Do I need to change out the capacitor too at the same time?

Thanks for all the comments and suggestions so far!

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