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Thread: conjoined furnaces
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12-15-2009, 11:16 AM #1
conjoined furnaces
I've seen houses with two or three furnaces, but they were always separate. These two are joined together. Any illuminating comments would be appreciated.
Similar Threads:"There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
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12-15-2009, 11:43 AM #2
Re: conjoined furnaces
My first thought is be that it's not going to be possible to balance both sides, and if there is a HE failure...
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12-15-2009, 11:58 AM #3
Re: conjoined furnaces
So long as air flow, gas, venting is planned and executed properly, I don't see a problem. Very common practice in churches, etc. Some manufacturers used to provide conversion kits. There should be a common relay to ensure all blowers operate simultaneously to prevent counter flow back through an idle unit.
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12-15-2009, 12:07 PM #4
Re: conjoined furnaces
"There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
www.ArnoldHomeInspections.com
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12-15-2009, 01:21 PM #5
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12-15-2009, 01:30 PM #6
Re: conjoined furnaces
"There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
www.ArnoldHomeInspections.com
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12-15-2009, 08:53 PM #7
Re: conjoined furnaces
I would think that without that center dividing panel, each blower is going to be sucking from the other blower ... install that panel and each blower will operate in the manner in which it was designed.
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12-16-2009, 05:02 AM #8
Re: conjoined furnaces
I would think that without that center dividing panel, each blower is going to be sucking from the other blower ... install that panel and each blower will operate in the manner in which it was designed.
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Furnaces can be twinned to operate at the same time,,Staged to operate as needed with a zone damper to prevent air from bieng sucked back from idle unit. Either way the return is common to each unit.
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12-16-2009, 08:37 AM #9
Re: conjoined furnaces
Bryant 394-B - Installation Instructions - Tandem Gas-Fired Forced-Air Furnace.
A quick read (for example the separate return air openings in figure 3 and the note below installation step 1-5) suggests to me that these may not be intended to be installed with a cross-connected blower compartment.
Last edited by Michael Thomas; 12-16-2009 at 08:48 AM.
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12-16-2009, 11:28 AM #10
Re: conjoined furnaces
A quick read (for example the separate return air openings in figure 3 and the note below installation step 1-5) suggests to me that these may not be intended to be installed with a cross-connected blower compartment.
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Michael Thomas
Paragon Property Services Inc., Chicago
That particular instruction booklet is from 1974, a few things have changed since then.
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12-16-2009, 06:55 PM #11
Re: conjoined furnaces
However, air still flows under the same laws of physics as it did back in 1820, with some revisions on the written understanding of those laws - nature did not change, only the human understanding of what happens and why changes.
- Installation
- - 2. Apply proper seal around return air openings to prevent air leakage. Apply sponge tape from accessory package to right side of base of control furnace. This provides an air seal between furnaces.
- - etc.
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12-16-2009, 07:02 PM #12
Re: conjoined furnaces
Did I mention that there was "oil canning" noise when the fans started up?
"There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
www.ArnoldHomeInspections.com
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12-17-2009, 06:27 AM #13
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12-17-2009, 06:33 AM #14
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12-17-2009, 04:32 PM #15
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