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State College, PA
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State College, PA
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 New Furnace and Flue with corrosion after 2 weeks
[#2] Posted: 01/05/2012 - 4:25:22 PM |  |  |
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State: PA & NJ
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New Furnace and Flue with corrosion after 2 weeks
[#3] Posted: 01/05/2012 - 4:31:47 PM | | |
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Pictures usually don't appear because of spaces in the file name.
The white deposits are probably from condensation. It's a sign that combustion byproducts are cooling in the vent connector or in the vertical chimney flue too soon. It can be from a number of reasons. One possibility is that the new furnace output is cooler than the previous, requiring a smaller chimney flue so that the exhaust rises to the top of the chimney before cooling.
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| Bill Kibbel, Historic & Commercial Building Inspections - Old House Resources |
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State College, PA
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State College, PA
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Gaston, Oregon
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State College, PA
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New Furnace and Flue with corrosion after 2 weeks
[#8] Posted: 01/05/2012 - 5:43:59 PM | | |
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What would you guys suggest I do?
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Northville, New York
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New Furnace and Flue with corrosion after 2 weeks
[#9] Posted: 01/05/2012 - 7:32:28 PM | | |
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I'll bet that:
1. not only is the furnace more efficient but, the firing rate is less.
2. the chimney is located on the exterior of the building.
As has been stated, condensation is occurring inside the flue. The flue will need to be made smaller and easier to heat. This will involve the installation of a properly sized stainless steel liner inside the masonry chimney.
As Jim Katen mentioned, make sure that the furnace is not short cycling.
Tom Corrigan, Ret.
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Lansdale, pa
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New Furnace and Flue with corrosion after 2 weeks
[#10] Posted: 01/05/2012 - 8:23:53 PM | | |
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Another thing to look at is whether the chimney flue extends below the flue connector. That allows some condensation to collect at the bottom and evaporate when the flue is hot. Sometimes that space gets filled with soot or debris.
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louisville, ne
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New Furnace and Flue with corrosion after 2 weeks
[#11] Posted: 01/05/2012 - 9:08:57 PM | | |
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How about a picture of the rest of the install,including where flue attaches to furnace?
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State College, PA
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State: PA & NJ
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New Furnace and Flue with corrosion after 2 weeks
[#13] Posted: 01/06/2012 - 7:51:27 PM | | |
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The vent connector is very long with several elbows. Combine that with the increase in it's dimension, prior to the termination at the vertical chimney flue, is likely the primary cause of the condensation. (Do the horizontal sections slope the right way?)
They probably put the sealant and tape on the joints of the vent connector because combustion byproducts, having already cooled before rising up the chimney, were spilling out. A properly installed natural-draft vent system needs nothing added to the joints and nothing leaks out.
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| Bill Kibbel, Historic & Commercial Building Inspections - Old House Resources |
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louisville, ne
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Northville, New York
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New Furnace and Flue with corrosion after 2 weeks
[#15] Posted: 01/07/2012 - 08:55:52 AM | | |
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Here I go agreeing with a contractor but,
Note also that the minimum required clearance between the single wall smoke pipe and the plastic condensate drain, the plastic plumbing waste pipe and (if the code guy is on his game) the combustible refrigerant tube insulation is required to be at least 18"!
You will need to install a type L smoke pipe and/or change to non-combustible pipes and insulation.
Tom Corrigan
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State College, PA
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Crystal Lake, IL
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Dallas, TX
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New Furnace and Flue with corrosion after 2 weeks
[#18] Posted: 01/07/2012 - 2:57:03 PM | | |
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Quote: Originally posted by Jerry SimonQuote: Originally posted by Tom Corrigan
Here I go agreeing with a contractor but,
Tom Corrigan
Uhm, where are your bouncing smiley-faces?
When you reply click on the "Show Entire Smile List"
I just tried it as I didn't know where they were either.
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Cheers,
Nolan E. Kienitz
Nolan's Inspections, LLC
Dallas Home Inspections
http://www.NolansInspections.com
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Ridgewood, NJ
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New Cumberland, PA
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New Furnace and Flue with corrosion after 2 weeks
[#20] Posted: 01/11/2012 - 11:37:51 AM | | |
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Why does the floor appear wet?
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louisville, ne
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New Furnace and Flue with corrosion after 2 weeks
[#21] Posted: 01/11/2012 - 11:53:06 AM | | |
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Probably all the water leaking past the red rtv hes got slopped all over the joints on the single wall fittings! 
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Alexandria, Virginia
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New Furnace and Flue with corrosion after 2 weeks
[#22] Posted: 03/14/2012 - 11:36:45 PM | | |
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First things first guys, this is an oil furnace which requires tuning to set the air fuel mix and dial in the stack temp to ensure condensation doesnt occur in chimney. The first thing that should be done is a combustion analisys by an oil tech and make sure the burner is set up properly. Oil is not like a gas unit ( plug and play) it must be tuned up annually. One can make many adjustments from O2 levels, oil pressure, and oil flow rate, all of which affect stack temps therefore the potential for condensation. I wont touch an oil burner without performing combustion analisys.
Or could be rain water infiltration
Install notes; the exhaust/ flue piping MUST always have a positive pitch, yours does not and this is a major concern! around here its against code to add sealant or tape to metal flue piping as its not needed therefore is used to conceal a problem.. Get a good oil tech out to inspect/correct installation.
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