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Posted by Don Ocean on October 23, 2008, 12:01 am
kjpro @ news .com wrote:
>> kjpro @ news .com wrote:
>>>> kjpro @ news .com wrote:
>>>>>> 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
>>>>> Ok, here's a clue for everyone...
>>>>> What problem can exist from a unit with no pressure switch (and no
>>>>> other fault sensed), yet it trips the rollout?
>>>> Vent plugged? And/or other things.. Lights with a bang?
>>> Very good grasshopper....
>>> Mud nest in the outlet of the combustion blower.
>>> Lit with a bang... enough to bow the cabinet door.
>> Which of course cuts labor costs as it is already partially disassembled.
>> ;-p
>
>
> Don't forget the charge for sheet metal work. :-)
Its a great deal. That bent panel can also double as a Ford Hubcap.
>
>
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