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Old 10-28-2010, 04:44 PM   #1
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Armstrong down to up conversion?


Got a furnace in exchange for plumbing work done, unfortunately for me, it's an upflow style. My existing 1960's Airco furnace is a downflow, as my house is a rancher with all the ductwork in the crawlspace. I don't have enough room in my teeny mech. room to have an elbow off the top and run behind the furnace to the crawlspace plenum. The furnace is an Armstrong Air Ultra V Enhanced 80.
Can you do anything with the squirell cage fan to make it blow down, not up? Then cover up the side return hole and move the filter rack to the top of the furnace? Is it as easy as spinning the fan and motor 180 degrees?
Some advice from a pro would be sweet. I'm tired of sending 60% of my gas up the chimney with my old piece of crap furnace.

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Old 10-28-2010, 04:58 PM   #2
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Armstrong down to up conversion?


Not possible unfortunately. The limit safety controls are designed for upflow use and not allowed to be used any other way. Air has to cross the exchanger in proper direction or it will overheat/fail etc. Would void any UL and CGA approvals and void your fire ins. Can only buy high efficiency furnaces in Canada as of Jan1 this yr. There are downflow/counterflow versions of high efficiency furnaces but not all manufacturers make them. Lennox G51 is a good reliable basic meat and potatoes furnace and can be used both ways.

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Old 10-28-2010, 05:02 PM   #3
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Armstrong down to up conversion?


Thanks, Yuri! Wanna buy a used furnace?
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Old 10-28-2010, 05:32 PM   #4
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Armstrong down to up conversion?


Nyet. Nope. Nada.
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Old 10-28-2010, 05:50 PM   #5
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Hey, come on! $200 for the furnace, shippings $200 to Winterpeg, you could slog it off to some poor sucker for $450, $500. Badda bing, ya got 50, maybe 100 bucks in yer pocket!
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Old 10-28-2010, 05:57 PM   #6
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Armstrong down to up conversion?


What, and ruin my perfect "Maytag guy" sterling reputation. My clients are package customers, furnace, A/C air cleaner and start at $12,000 and up sales.

Funny thing, ole Yuri has a basic G51 in his house.
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Old 10-29-2010, 02:47 AM   #7
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Armstrong down to up conversion?


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What, and ruin my perfect "Maytag guy" sterling reputation. My clients are package customers, furnace, A/C air cleaner and start at $12,000 and up sales.

Funny thing, ole Yuri has a basic G51 in his house.
Whoa!!!! Hold yer horses there guys Yuri is a Lennox guy and I am a Maytag guy.

Let's not get a minor border war going over intellectual properties!
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Old 10-29-2010, 03:09 AM   #8
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Armstrong down to up conversion?


Picture this: Dave Lennox runs from Maytag man.

Maytag draws a .357 Magnum , spreads his legs and crouches in pistol firing stance.

Three shots are heard....Dave Lennox's right elbow explodes in a bloody mist. The second shot breaks Dave's thigh bone and he goes down.
Before hitting the ground the third shot enters Dave's head just behind his left ear.

Dave;s face explodes out ward throwing his work cap across the room in a splatter of gore.

Lennox international is absorbed by Nordyne
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Old 10-29-2010, 04:39 AM   #9
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Armstrong down to up conversion?


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Thanks, Yuri! Wanna buy a used furnace?
Before you buy another furnace.
Might want to do a load calc. So you know what size you need.

Most likely your duct work is undersized for a high efficiency furnace of the same BTU input as your old oversized furnace.

Newer furnaces need to move a lot more air then the older ones did.
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Old 10-29-2010, 07:01 AM   #10
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Been thinking about that. Likely the whole she-bang'll have to go. And it's asbestos duct sealer....
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Old 10-29-2010, 05:21 PM   #11
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Gotta love those Sixties !!

Is it just a small amount of thin tape on the joints or is it wrapped in sheets?

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Last edited by beenthere; 10-29-2010 at 05:48 PM. Reason: Removed pic
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