Natural Gas furnace... whoomp when igniting...

Posted by Jennyfer on November 25, 2007, 2:24 pm

I have a natural gas furnace and most times, when it lights, it lets off an
increasingly loud 'whoomp'...

I checked the pilot light and it is up pretty high...

Knowing some basic physics, it is obvious that the gas is filling the
chamber and then when the fuel-air mixture hits the right spot, it lights...

I wouldn't really care, but it didn't used to do this...

Jenns

Posted by on November 25, 2007, 2:29 pm

Jennyfer wrote:

> I have a natural gas furnace and most times, when it lights, it lets off an
> increasingly loud 'whoomp'...
>
> I checked the pilot light and it is up pretty high...
>
> Knowing some basic physics, it is obvious that the gas is filling the
> chamber and then when the fuel-air mixture hits the right spot, it lights...
>
> I wouldn't really care, but it didn't used to do this...
>
>
>
> Jenns
>
>

How old is this furnace. No matter.
My guess is that the burners are dirty. Call a repairman to diagnose the
problem and probably remove and clean or replace the burners. If you
leave it like this you could crack the heat exchanger, or worse.

Posted by Bubba on November 25, 2007, 2:31 pm

wrote:

>I have a natural gas furnace and most times, when it lights, it lets off an
>increasingly loud 'whoomp'...
>I checked the pilot light and it is up pretty high...
>Knowing some basic physics, it is obvious that the gas is filling the
>chamber and then when the fuel-air mixture hits the right spot, it lights...
>I wouldn't really care, but it didn't used to do this...
>Jenns

Good thing you know physics. Do you know the one where you hear a loud
noise and look down finding yourself 20 ft in the air?
Have you thought of having a "tune-em-up, clean-em-up" done to your
furnace?
Bubba

Posted by Megatron on November 25, 2007, 3:32 pm

>I have a natural gas furnace and most times, when it lights, it lets off an
>increasingly loud 'whoomp'...
> I checked the pilot light and it is up pretty high...
> Knowing some basic physics, it is obvious that the gas is filling the
> chamber and then when the fuel-air mixture hits the right spot, it
> lights...

The industry term for this is "delayed ignition".

It's a euphemism for a fucking EXPLOSION.

Posted by Tony on November 25, 2007, 4:25 pm

As some of guys told you, you need proper cleaning in and around the
furnace but also check that your location of furnace is not on vacuum
in other words if you have clothes dryer in same are make sure your dryer
is not creating vacuum in the area or you are having some type of blockage
in smoke stack, the items above can spell disaster.
Tony

>I have a natural gas furnace and most times, when it lights, it lets off an
>increasingly loud 'whoomp'...
> I checked the pilot light and it is up pretty high...
> Knowing some basic physics, it is obvious that the gas is filling the
> chamber and then when the fuel-air mixture hits the right spot, it
> lights...
> I wouldn't really care, but it didn't used to do this...
> Jenns
>

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