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Permalink Reply by randy tolowski on January 28, 2012 at 12:23am

Is there anyone out there? or is this another do nothing site like most of these discussons

Permalink Reply by Evan Mills on January 28, 2012 at 11:59pm

Randy,

Very few people can see this post as membership in this group is still quite small.

Feel free to repost on the main Forum page, where all members will see.

Permalink Reply by Christopher Morin on April 10, 2012 at 5:48pm

Hi Randy,

  Very often when completing combustion analysis on 90+ AFUE furnaces, I tend to get a Steady State Efficiencies that are higher than the rated AFUE!  This is because of the likely test location, being at the flue terminal outdoors.  Due to the loss in flue temp, this drives the SSE up.  If you have significantly low SSE start looking for incomplete combustion (too much excess air, too much gas, etc).  I once tested an 80% AFUE furnace that had so much excess air that the SSE was 68%.  When I ripped the furnace out, there was a huge hole in the back of the heat exchanger that I couldn't see with the scope!  Combustion Analysis not only sold the new unit - but maybe saved the homeowner's life!

Good Luck!

Chris