smoky smell with slant/fin direct vent and riello bf5 combo

MW1212

I have a 3 year old slant/fin direct vent furnace with a riello burner. oil fired. It has a smoke smell that seems to come from the boiler when running. The smell is not a gas like smell, but more of a burnt smell. I have tried two carbon monoxide detectors and neither register on the LCD, so I believe it is not exhaust.







My furnace technician has cleaned the furnace yearly, has resealed with

high temp silicone the hood each year, and this year put on a post purge

blower, but it still smells. It is a 3 year old furnace.







The technician recommends we convert from direct vent to a chimney with flu. Will this really fix the problem. Are there other options?

MW1212

smelly slant/fin model ...

This is a slant/fin TR-DV-30PT, riello BF5



The direct vent is on the north side of the house (I"m told this is the worst place, but the only place it could go due to code and the window /deck on the other 2 walls.



The furnace is cleaned yearly before the winter season starts.  The cleaning helps the issue, but it gets progressively worse as the season goes on,  but even after cleaning it smells to what you would not want or expect.



The test results were:



c/o b/v 85x70W, 1-A-30, SSC126G, S-OK OSMOKE 11.5x500Degrees=81.5% EFF

MW1212

test results

Looking again at the results I see what you wanted now (Not that I understand these):  I gave you a bunch of filter and nozzle numbers before in addition to the below.



2009:  11.8% CO2 @500 degrees, 0 smoke, 81.7% efficiency

2010:  11.5% CO2 @500 degrees, 0 smoke, 81.5% efficiency

billtwocase

Also

What is your post purge time? Less than 3-4 min, no good

MW1212

Post purge time

Is 2mins right now

MW1212

Unfortunately im told relocating is ...

Not a possibility due to the deck on the west side and farmers porch on the east, then the attached garage takes the south side? I'm limited with options.