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Old 03-22-2012, 08:36 PM   #16
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Rheem white powder near exhaust vent?


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Originally Posted by how View Post
The lack of any signs of scorch marks and the fact that the roll out switches (in the picture) have not tripped make backdrafting an unlikely diagnosis. A badly cracked exchanger could help cool down the vent gases but once again neither the PS or the roll out sw have been affected.
I would recommend that the tech check out the exchanger problem possibility
BUT...
If that B vent is only 5" then his furnace vent would have to be half that size which is not possible. It's more likely that he has an oversized vent, with an long lateral run, 30% less btus with the HWT change, all in a cool garage, hense the condensate powder vent production.
Let us know what your tech finds>
Just got home and was able to double check the labels on the vent its a 5 inch vent.
It a Rheem Criterion II 75K BTU

found the specsheet here http://www.rheem.com/documents/rgph-...ication-sheets


Last edited by mikebau; 03-22-2012 at 08:45 PM.
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Old 03-22-2012, 09:01 PM   #17
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Rheem white powder near exhaust vent?


Get a tech to run a combustion analyzer on the furnace to help identify the issue. may be underfired or could need a post purge circuit. A good tech will be able to figure it out in no time
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Old 03-22-2012, 09:49 PM   #18
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Rheem white powder near exhaust vent?


You didn't see the staining in the furnace vestibule?

And if you look close he has a B-vent connector.


If a furnace does not vent properly the products of combustion linger and flow out the burner opening and stain the exterior. It won't usually trip the roll out because the fumes are too cool.

Last edited by hvac5646; 03-22-2012 at 09:53 PM.
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Old 03-23-2012, 12:05 AM   #19
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Rheem white powder near exhaust vent?


Hey HVAC5646
Didn't see water staining but it also doesn't look like a unit that was serviced yearly.. I'll look again.

Changed my C- vent -B vent queston after he posted his pictures. The sequences were strange because the op would add later pic's and additions to his posts.

HVAV quote
If a furnace does not vent properly the products of combustion linger and flow out the burner opening and stain the exterior. It won't usually trip the roll out because the fumes are too cool.
Spilling flue gases at the burner mouth of an 80% that are too cool to trip the spill switch is beyond my experience. Are you talking talking about fumes that are part way up the vent that reverse after the ID shuts off?

Last edited by how; 03-23-2012 at 12:11 AM.
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Old 03-23-2012, 07:37 AM   #20
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Rheem white powder near exhaust vent?


Yeah....I had three different situation ...bird in the connector....two partially plugged flues....never tripped the roll out. Flames were lazy but stayed inside.
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Old 03-29-2012, 06:35 PM   #21
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Rheem white powder near exhaust vent?


So here is what the guy came out and noticed. Air filters were dirty which I guess caused the heater to cycle more often. Says the heat exchanger has some loose tubes I dont really know what that means.

I have AC on this house and he says the cooling coil is also dirty.

This house was a forclosure that I purchased so I have no idea what the prior state of repairs was.

I assume the heat exchanger will need to be replaced sometime in the future. Where can parts be purchased for this? Now the AC coil he is telling me he needs to drain the AC pull out the coil to clean it. That sounds a little over the top to me.
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Old 03-29-2012, 07:35 PM   #22
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Rheem white powder near exhaust vent?


So..
Did he have nothing to say about the precipitate inside the furnace or was he saying that loose exchanger tubes were the cause of it??

Did you see how he determined that you have loose exchanger tubes and a dirty ac coil?

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