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Posted by on October 20, 2008, 7:24 pm
> wrote:
>>>>kjpro @ news .com wrote:
>>>>>> Hi All... my neighbor's carbon monoxide alarm goes off, she shuts
>>>>>> down her 1996 Carrier Weathermaker 58TUA hi-efficiency furnace,
>>>>>> calls in Frank the HVAC guy, and after a peek inside (from the top),
>>>>>> Frank concludes that the heat exchanger is cracked and a whole new
>>>>>> furnace is needed.
>>>>>> Is this possible? Common?
>>>>>> How can you tell if it's cracked (it looks like new haha)?
>>>>>> What else might be the matter?
>>>>>> Carrier had a 20yr warranty on those things back then... shouldn't a
>>>>>> suggestion be made to use it?
>>>>>> This was an expensive furnace... wt*?
>>>>>> Thanks for all of your help,
>>>>>>> Dan
>>>>> It's just the normal shit that Frank pulls on a daily basis.
>>>>> Now tell your friend to call someone that's competent this time!
>>>>You should [listen to kjpro]. Get a second opinion. Find a service
>>>>company
>>>>with a "Gas Analyzer" to check for CO coming from the appliance. They
>>>>can
>>>>also check for a crack by checking the CO level before, during, and
>>>>after
>>>>the furnace is in operation in the flu.
>>> Zyp,
>>> Just a slight correction. A CO detector will NOT always find a crack
>>> in a heat exchanger. Many furnaces with cracks support proper
>>> combustion just fine. I wouldnt want that furnace in my home but a
>>> crack in a heat exchanger doesnt always burn "dirty" and cause carbon
>>> monoxide.
>>> Im just restating that but Im sure thats what you meant. :-)
>>> Bubba
>>You know the HX is cracked when the furnace cycles off and the pilot gets
>>blown out by the fan, or it trips the roll-out switch(s)
> hehe.
> Im just sayin.....I had a Tempstar a few years back (90%er) that I got
> a call on no heat. It was the main limit (the little camstat POS) that
> failed open. I finally looked in and the plastic collector on the side
> of the secondary had a hole in the top of it big enough to put a
> tennis ball in. The burner roll out never did trip. His CO detectors
> never went off (most of them wont though but thats a whole nother
> story). Ive had many Tempstars and Janitrols that I found popped rings
> on that were burning just fine. Its a bit harder to condem someone's
> furnace when they call for a "tune-up" and you have to give them the
> "good" news about their working defective furnace.
> Bubba
Yep, most will continue to use them till they DO trip the rollouts.
<rolleyes>
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Posted by on October 20, 2008, 7:20 pm
>>>kjpro @ news .com wrote:
>>>>> Hi All... my neighbor's carbon monoxide alarm goes off, she shuts
>>>>> down her 1996 Carrier Weathermaker 58TUA hi-efficiency furnace,
>>>>> calls in Frank the HVAC guy, and after a peek inside (from the top),
>>>>> Frank concludes that the heat exchanger is cracked and a whole new
>>>>> furnace is needed.
>>>>> Is this possible? Common?
>>>>> How can you tell if it's cracked (it looks like new haha)?
>>>>> What else might be the matter?
>>>>> Carrier had a 20yr warranty on those things back then... shouldn't a
>>>>> suggestion be made to use it?
>>>>> This was an expensive furnace... wt*?
>>>>> Thanks for all of your help,
>>>>>> Dan
>>>> It's just the normal shit that Frank pulls on a daily basis.
>>>> Now tell your friend to call someone that's competent this time!
>>>You should [listen to kjpro]. Get a second opinion. Find a service
>>>company
>>>with a "Gas Analyzer" to check for CO coming from the appliance. They
>>>can
>>>also check for a crack by checking the CO level before, during, and after
>>>the furnace is in operation in the flu.
>> Zyp,
>> Just a slight correction. A CO detector will NOT always find a crack
>> in a heat exchanger. Many furnaces with cracks support proper
>> combustion just fine. I wouldnt want that furnace in my home but a
>> crack in a heat exchanger doesnt always burn "dirty" and cause carbon
>> monoxide.
>> Im just restating that but Im sure thats what you meant. :-)
>> Bubba
> You know the HX is cracked when the furnace cycles off and the pilot gets
> blown out by the fan, or it trips the roll-out switch(s)
Not exactly true...
Tripped rollouts on a unit with no vent pressure switch.
Problem? (it had a perfect heat exchanger)
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Posted by geothermaljones on October 20, 2008, 8:27 pm
It's a 12 yr old Carrier...
They had more than their fair share of lousy heat exchangers...
I'd look into that 20yr warranty, although being prorated...
geothermaljones
>>>>kjpro @ news .com wrote:
>>>>>> Hi All... my neighbor's carbon monoxide alarm goes off, she shuts
>>>>>> down her 1996 Carrier Weathermaker 58TUA hi-efficiency furnace,
>>>>>> calls in Frank the HVAC guy, and after a peek inside (from the top),
>>>>>> Frank concludes that the heat exchanger is cracked and a whole new
>>>>>> furnace is needed.
>>>>>> Is this possible? Common?
>>>>>> How can you tell if it's cracked (it looks like new haha)?
>>>>>> What else might be the matter?
>>>>>> Carrier had a 20yr warranty on those things back then... shouldn't a
>>>>>> suggestion be made to use it?
>>>>>> This was an expensive furnace... wt*?
>>>>>> Thanks for all of your help,
>>>>>>> Dan
>>>>> It's just the normal shit that Frank pulls on a daily basis.
>>>>> Now tell your friend to call someone that's competent this time!
>>>>You should [listen to kjpro]. Get a second opinion. Find a service
>>>>company
>>>>with a "Gas Analyzer" to check for CO coming from the appliance. They
>>>>can
>>>>also check for a crack by checking the CO level before, during, and
>>>>after
>>>>the furnace is in operation in the flu.
>>> Zyp,
>>> Just a slight correction. A CO detector will NOT always find a crack
>>> in a heat exchanger. Many furnaces with cracks support proper
>>> combustion just fine. I wouldnt want that furnace in my home but a
>>> crack in a heat exchanger doesnt always burn "dirty" and cause carbon
>>> monoxide.
>>> Im just restating that but Im sure thats what you meant. :-)
>>> Bubba
>> You know the HX is cracked when the furnace cycles off and the pilot gets
>> blown out by the fan, or it trips the roll-out switch(s)
> Not exactly true...
> Tripped rollouts on a unit with no vent pressure switch.
> Problem? (it had a perfect heat exchanger)
>
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Posted by on October 21, 2008, 12:32 am
>>>>>kjpro @ news .com wrote:
>>>>>>> Hi All... my neighbor's carbon monoxide alarm goes off, she shuts
>>>>>>> down her 1996 Carrier Weathermaker 58TUA hi-efficiency furnace,
>>>>>>> calls in Frank the HVAC guy, and after a peek inside (from the top),
>>>>>>> Frank concludes that the heat exchanger is cracked and a whole new
>>>>>>> furnace is needed.
>>>>>>> Is this possible? Common?
>>>>>>> How can you tell if it's cracked (it looks like new haha)?
>>>>>>> What else might be the matter?
>>>>>>> Carrier had a 20yr warranty on those things back then... shouldn't a
>>>>>>> suggestion be made to use it?
>>>>>>> This was an expensive furnace... wt*?
>>>>>>> Thanks for all of your help,
>>>>>>>> Dan
>>>>>> It's just the normal shit that Frank pulls on a daily basis.
>>>>>> Now tell your friend to call someone that's competent this time!
>>>>>You should [listen to kjpro]. Get a second opinion. Find a service
>>>>>company
>>>>>with a "Gas Analyzer" to check for CO coming from the appliance. They
>>>>>can
>>>>>also check for a crack by checking the CO level before, during, and
>>>>>after
>>>>>the furnace is in operation in the flu.
>>>> Zyp,
>>>> Just a slight correction. A CO detector will NOT always find a crack
>>>> in a heat exchanger. Many furnaces with cracks support proper
>>>> combustion just fine. I wouldnt want that furnace in my home but a
>>>> crack in a heat exchanger doesnt always burn "dirty" and cause carbon
>>>> monoxide.
>>>> Im just restating that but Im sure thats what you meant. :-)
>>>> Bubba
>>> You know the HX is cracked when the furnace cycles off and the pilot
>>> gets blown out by the fan, or it trips the roll-out switch(s)
>> Not exactly true...
>> Tripped rollouts on a unit with no vent pressure switch.
>> Problem? (it had a perfect heat exchanger)
> It's a 12 yr old Carrier...
> They had more than their fair share of lousy heat exchangers...
> I'd look into that 20yr warranty, although being prorated...
> geothermaljones
Nope, Lennox and the heat exchanger is fine...
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Posted by Zyp on October 21, 2008, 11:10 pm
kjpro @ news .com wrote:
>>>>> wrote:
>>>>>> kjpro @ news .com wrote:
>>>>>>>> Hi All... my neighbor's carbon monoxide alarm goes off, she
>>>>>>>> shuts down her 1996 Carrier Weathermaker 58TUA hi-efficiency
>>>>>>>> furnace, calls in Frank the HVAC guy, and after a peek inside
>>>>>>>> (from the top), Frank concludes that the heat exchanger is
>>>>>>>> cracked and a whole new furnace is needed.
>>>>>>>> Is this possible? Common?
>>>>>>>> How can you tell if it's cracked (it looks like new haha)?
>>>>>>>> What else might be the matter?
>>>>>>>> Carrier had a 20yr warranty on those things back then...
>>>>>>>> shouldn't a suggestion be made to use it?
>>>>>>>> This was an expensive furnace... wt*?
>>>>>>>> Thanks for all of your help,
>>>>>>>>> Dan
>>>>>>> It's just the normal shit that Frank pulls on a daily basis.
>>>>>>> Now tell your friend to call someone that's competent this time!
>>>>>> You should [listen to kjpro]. Get a second opinion. Find a
>>>>>> service company
>>>>>> with a "Gas Analyzer" to check for CO coming from the appliance.
>>>>>> They can
>>>>>> also check for a crack by checking the CO level before, during,
>>>>>> and after
>>>>>> the furnace is in operation in the flu.
>>>>> Zyp,
>>>>> Just a slight correction. A CO detector will NOT always find a
>>>>> crack in a heat exchanger. Many furnaces with cracks support
>>>>> proper combustion just fine. I wouldnt want that furnace in my
>>>>> home but a crack in a heat exchanger doesnt always burn "dirty"
>>>>> and cause carbon monoxide.
>>>>> Im just restating that but Im sure thats what you meant. :-)
>>>>> Bubba
>>>> You know the HX is cracked when the furnace cycles off and the
>>>> pilot gets blown out by the fan, or it trips the roll-out switch(s)
>>> Not exactly true...
>>> Tripped rollouts on a unit with no vent pressure switch.
>>> Problem? (it had a perfect heat exchanger)
>> It's a 12 yr old Carrier...
>> They had more than their fair share of lousy heat exchangers...
>> I'd look into that 20yr warranty, although being prorated...
>> geothermaljones
> Nope, Lennox and the heat exchanger is fine...
Using a CO gas analyzer can measure the CO from the flu. Generally
something less than 18 ppm for most gas fired furnaces. When the indoor
blower comes on and forces positive pressure into the heat exchanger [a
rupture] will in most cases show the CO going down. [An increase in
unburned gases [air] getting into the firebox will show a decrease in CO
because of dilution.] When you see this condition, it warrants pulling to
blower and / or burners for further investigation.
The Carrier of a 1996 vintage will have an aluminized heat exchanger, albeit
it's installed correctly would have a good life span, but if there's
insufficient air... well you know. :)
--
Zyp
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