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Old 12-16-2008, 06:52 PM   #1
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Trane XR 90 [ Very Noisy]


I have a Trane XR 90 with two (2) 3" PVC pipes leading to the exterior. One for exhaust & one for fresh outside air induction. The intake is VERY noisy, & sounds like a loud vacumn cleaner or turbine.. My questions are:

1) Do I really need outside air induction?
2) Will inside (basement) air induction quiet down the unit?
3) If changed to indoor air induction, will furnace BTUs or efficiency be negatively affected?

Thanks, Mike

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Old 12-17-2008, 12:25 PM   #2
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Trane XR 90 [ Very Noisy]


One issue when drawing indoor air is you can create a negative pressure in the house depending on how tight your home is. Because of this I'm not a huge fan of drawing indoor air, but Trane does allow for this, so call them and find out. Have read in some locales you need 50 CF of volume for every 1000 BTUs, so its good to check with your codes office just in case. Mine loves to say 'whatever the manufacturer says'.

In my area one Trane installer adds a T on your intake pipe to draw both indoor and outdoor air because drifting snow has been known to block some setups. This might be an option but could cause cold drafts when the furnace is idle.

Last XR90 I saw that used indoor air had larger than a 3" intake pipe, maybe a large pipe adapted somewhere along the way will reduce velocity and noise.

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Old 12-17-2008, 04:24 PM   #3
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Trane XR 90 [ Very Noisy]


You'll just have that loud noise in your basement if you swtich to inside air.
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Old 12-17-2008, 06:48 PM   #4
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Trane XR 90 [ Very Noisy]


Appreciate the reponse.. But are these units usually loud? Find it hard to believe that the air return ducts aren't sufficient to feed the unit with enough make-up air.. Mike
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Old 12-18-2008, 05:35 AM   #5
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Trane XR 90 [ Very Noisy]


They aren't real quit.

You can try it with the intake pipe removed, and see if its quiter.
Just disconnect it, plug up the pipe for the day and night, and see if its quiter. If it is, remove teh pipe from the wall.
If its too loud in the basement, hook it back up.
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