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Old 01-25-2012, 04:15 AM   #1
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Modulating Furnaces


As I understand there are different versions of modulation ie flame valve burners vs just variable blower speeds. Given the complexities of these, I would expect the repair and maintenance costs would be quite high when they fail, what would be the most proven design today?

Somebody here posted that Ruud has had their modulating unit out longer 12+ years than the others ie lennox, trane Bryant etc for 3-5 yrs. If I go modulating, I may go with Ruud for this reason

Any advice pls?

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Old 01-25-2012, 06:37 AM   #2
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Modulating Furnaces


it is wickedly complicated and uses a very expensive tstat. one of the very few furnaces I won't work on. needs a specially trained Rheem tech.

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Old 01-25-2012, 08:47 AM   #3
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Modulating Furnaces


And that tech brings a two hundred and fifty page factory reference manual...

i went to a RSES seminar on the Rheem mod. By the time the Speaker was done talking I had a head ache.
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Old 01-25-2012, 09:14 AM   #4
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Quote:
Originally Posted by hvac5646 View Post
And that tech brings a two hundred and fifty page factory reference manual...
I'm in the market right now for a new system.

After a lot of back and forth with the latest in whiz bang furnace options...
I'm leaning toward a simple controls 80% gas furnace to back up a heat pump.

That it is an inexpensive alternative suits me right down to the ground.

Last edited by TarheelTerp; 01-25-2012 at 09:33 AM.
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Old 01-25-2012, 11:01 AM   #5
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Modulating Furnaces


buy one with a constant torque ecm motor. they save a lot of electricity $$ and maintain a constant torque and airflow as the filter plugs and have ball bearings instead of cheap sleeve bearings.

http://www.lennox.com/products/furnaces/ML180E/

other brands may have them too. not the same as a variable speed ecm motor but cost 50% less and do almost the same job.
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Last edited by yuri; 01-25-2012 at 11:04 AM.
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Old 01-25-2012, 01:08 PM   #6
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Modulating Furnaces


What are the hi end mod furnace brand features should look for please and how would I compare them?

The info on the ball bearing is very helpful

Thank you

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