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Posted by Bubba on October 20, 2008, 7:49 am
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
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>> blown out by the fan, or it trips the roll-out switch(s)