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kirwinjd 02-08-2013 06:42 PM

Customer hates noisy new furnace
 
Just installed a new goodman 80k furnace in customers house.
Customer called today complaining about how noisy the new furnace is compared to her old Gaffers and Sattler. The furnace is in the standard closet location in the hallway and apparently the noise is just the standard jet noise from the burners which I explained is inherent in all the 80% furnaces.
Her hardwood floors are not helping either.
Can anyone recommend some type of material to line the closet walls to insulate the noise?
Thanks a lot

TarheelTerp 02-08-2013 06:47 PM

Quote:

Originally Posted by kirwinjd (Post 1112696)
Customer called today complaining about how noisy the new furnace is compared to her old Gaffers and Sattler.

"They all do that ma'am"

Is the bill paid?

jagans 02-08-2013 07:08 PM

Foam Rubber...............Earplugs :thumbsup:

concretemasonry 02-08-2013 07:18 PM

Could be a bad install with vibrating sheet metal.

Have looked and felt everything? - Vibrations can be cured as long as you understand the harmonics of tin.

Dick

beenthere 02-08-2013 07:31 PM

Where does the combustion air come from.

ben's plumbing 02-08-2013 07:52 PM

what is the gas pressure..some times installing a regulator setting manifold pressure to 3.2 will quiet the inshot burnners down for closet installation...ben sr

kirwinjd 02-08-2013 08:43 PM

Quote:

Originally Posted by concretemasonry
Could be a bad install with vibrating sheet metal.

Have looked and felt everything? - Vibrations can be cured as long as you understand the harmonics of tin.

Dick

It's not a bad install but thanks anyways. Everything is tight. It's a brand new furnace and its running as smoothly as the other 25 + I installed last year. Everyone is different and most people are ok with it. I do get the 10% of customers who are noise sensitive and it may not even be the level of noise but a different noise. People are so used to the old furnace for 30 years, they no longer hear it

concretemasonry 02-08-2013 08:55 PM

Just because everything is tight does not make it good. Vibration and harmonics can get complicated and frustrating. Often, it can cause noises and in some cases some isolation can reduce the noise from everything attached to the furnace unless you want do do ductwork modifications. I had a rock solid professional furnace installation and discovered the noise were from the ductwork vibrations of the ducts. - I eliminated much of the noise with a bungee cord tight around a major duct and tied it up to a joist to change the harmonics and the cord was a spare and was uded in my utility room.

Dick

kirwinjd 02-08-2013 09:03 PM

Quote:

Originally Posted by concretemasonry
Just because everything is tight does not make it good. Vibration and harmonics can get complicated and frustrating. Often, it can cause noises and in some cases some isolation can reduce the noise from everything attached to the furnace unless you want do do ductwork modifications. I had a rock solid professional furnace installation and discovered the noise were from the ductwork vibrations of the ducts. - I eliminated much of the noise with a bungee cord tight around a major duct and tied it up to a joist to change the harmonics and the cord was a spare and was uded in my utility room.

Dick

Thanks again and your absolutely right about the issue of harmonics. It can be complex. What the customer is complaining about is the sound of the flames being jetted into the burners vs the old ribbon style burners.

kirwinjd 02-08-2013 09:08 PM

Quote:

Originally Posted by ben's plumbing
what is the gas pressure..some times installing a regulator setting manifold pressure to 3.2 will quiet the inshot burnners down for closet installation...ben sr

Thanks for the advice. Sounds like a good idea. I'll check it.

kirwinjd 02-08-2013 09:11 PM

Quote:

Originally Posted by beenthere
Where does the combustion air come from.

Combustion air coming from attic screen above.

bobelectric 02-08-2013 09:19 PM

I hear Nothing!

kirwinjd 02-08-2013 09:27 PM

Quote:

Originally Posted by bobelectric
I hear Nothing!

I wish lol But with that attitude, I'll also not hear my phone ring from customers who don't call contractors with a bad reputation

beenthere 02-09-2013 04:57 AM

Quote:

Originally Posted by kirwinjd (Post 1112827)
Combustion air coming from attic screen above.

1 inch duct board glued to the walls and door, or 1 inch thick duct wrap glued to the walls will reduce the amount of noise.

Foil side toward furnace.

yuri 02-09-2013 08:46 AM

Quote:

Originally Posted by kirwinjd (Post 1112825)
Thanks for the advice. Sounds like a good idea. I'll check it.

Dropping the manifold pressure to 3.2

Personally I would never do that as you risk the chance of delayed ignition. inlet pressure can vary but outlet pressure should always be 3.5. dropping the pressure reduces the velocity/speed of the gas and may change the timing of how fast the crossovers work or even the angle of the gas hitting the igniter. carrier and rheem have some issues with velocity thru the burner box and ignition patterns so I would not go there. problem may occur when new and probably will occur a few years from now when the burners get dirty or rust/corrosion on the ends of them which is unavoidable.

Duct insulation attached to the door and walls of the closet would be my choice. Check the manifold pressure anyway as it may be above 3.5 and overfired. seen that happen a lot.


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