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Posted by Peetie Wheatstraw on January 14, 2009, 8:28 pm
I belong to a little brick bungalow in the midwest US built in 1954. Original
forced-air (galvanized ductwork) heating, 2-yr-old Heil 80% furnace.
Lying in bed, very quiet, furnace begins heat cycle. About 15 seconds after
the burners fire, I hear a big POP. Very consistently. Every night.
I know that the furnace heat makes the sheet metal expand, and a certain
amount of noise (creaks, squeaks, etc) is to be expected, but this one sounds
too loud.
Walked the length of the ductwork, tapped each joint with a mallet, inspected
everything. No apparent problem.
Still I get the big POP.
Anything with 50-year-old galvanized ductwork that I should be looking for?
Thx,
Peetie
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Posted by hibb on January 14, 2009, 10:14 pm
wrote:
> I belong to a little brick bungalow in the midwest US built in 1954. Original
> forced-air (galvanized ductwork) heating, 2-yr-old Heil 80% furnace.
> Lying in bed, very quiet, furnace begins heat cycle. About 15 seconds after
> the burners fire, I hear a big POP. Very consistently. Every night.
> I know that the furnace heat makes the sheet metal expand, and a certain
> amount of noise (creaks, squeaks, etc) is to be expected, but this one sounds
> too loud.
> Walked the length of the ductwork, tapped each joint with a mallet, inspected
> everything. No apparent problem.
> Still I get the big POP.
> Anything with 50-year-old galvanized ductwork that I should be looking for?
> Thx,
> Peetie
Not sure if it is the sound you are talking about but some forced air
furnaces will cause the sheet metal to suddenly shift out when the fan
starts. Similar to what a balloon does when you blow air into it but
just enough to make a "Whoomp" sound when the sudden air pressure is
turned on.
In that case, it is usually the larger pieces of sheet metal near the
furnace that connects the furnace to the cold air return that make
that sound.
David
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Posted by Peetie Wheatstraw on January 15, 2009, 2:39 pm
>Not sure if it is the sound you are talking about but some forced air
>furnaces will cause the sheet metal to suddenly shift out when the fan
>starts. Similar to what a balloon does when you blow air into it but
>just enough to make a "Whoomp" sound when the sudden air pressure is
>turned on.
Just from the force of the air ...
>In that case, it is usually the larger pieces of sheet metal near the
>furnace that connects the furnace to the cold air return that make
>that sound.
I don't think that's it.
Mea Culpa: I did a poor job of describing it yesterday.
I measured again last nite. The burners fire, the blower kicks in,
and about 40 seconds later, I get the big POP!
I 'm pretty sure it has to do with increasing temp in the supply
(not return) ducts.
Thx,
Peetie
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Posted by C.D on January 16, 2009, 9:08 am
>>Not sure if it is the sound you are talking about but some forced air
>>furnaces will cause the sheet metal to suddenly shift out when the fan
>>starts. Similar to what a balloon does when you blow air into it but
>>just enough to make a "Whoomp" sound when the sudden air pressure is
>>turned on.
> Just from the force of the air ...
>>In that case, it is usually the larger pieces of sheet metal near the
>>furnace that connects the furnace to the cold air return that make
>>that sound.
> I don't think that's it.
> Mea Culpa: I did a poor job of describing it yesterday.
> I measured again last nite. The burners fire, the blower kicks in,
> and about 40 seconds later, I get the big POP!
> I 'm pretty sure it has to do with increasing temp in the supply
> (not return) ducts.
> Thx,
> Peetie
my furnace does the opposite. i get the loud POP when the blower shuts off.
--
C.D
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Posted by Peetie Wheatstraw on January 16, 2009, 1:28 pm
>> I measured again last nite. The burners fire, the blower kicks in,
>> and about 40 seconds later, I get the big POP!
>> I 'm pretty sure it has to do with increasing temp in the supply
>> (not return) ducts.
>> Thx,
>> Peetie
>my furnace does the opposite. i get the loud POP when the blower shuts off.
Immediatly? Before it's had any time to cool off?
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> forced-air (galvanized ductwork) heating, 2-yr-old Heil 80% furnace.
> Lying in bed, very quiet, furnace begins heat cycle. About 15 seconds after
> the burners fire, I hear a big POP. Very consistently. Every night.
> I know that the furnace heat makes the sheet metal expand, and a certain
> amount of noise (creaks, squeaks, etc) is to be expected, but this one sounds
> too loud.
> Walked the length of the ductwork, tapped each joint with a mallet, inspected
> everything. No apparent problem.
> Still I get the big POP.
> Anything with 50-year-old galvanized ductwork that I should be looking for?
> Thx,
> Peetie