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Old 11-26-2014, 01:08 PM   #1
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Aprilaire 500a install


So I'm installing a new aprilaire on my furnace and the tiny install sheet makes a passing note to install the bypass past the ac coil...however due to my low ceiling and duct work, the ac coil is as high up as it goes. The question is if I install the bypass before the ac coil will it cause any problems? The ac coil gets wet anyhow so I'm having a hard time seeing what problem this could cause.

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Old 11-26-2014, 01:10 PM   #2
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Aprilaire 500a install


Planned install
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Old 11-26-2014, 03:14 PM   #3
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Aprilaire 500a install


Put it below. No Problema. I did mine that way.

Not sure why they mention that. However you do not want to leave the bypass damper wide open as there is LOTS of pressure there and it could blow the water off the pad. I throttle mine 1/2 closed. Just need enough air to cross the pad and have enough time to pickup the moisture.
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Old 11-26-2014, 06:15 PM   #4
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Aprilaire 500a install


They usually tell you above. So you don't mount it level with the coil, and drill a hole in the coil in the process.

Below the coil is fine.
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Old 11-26-2014, 06:34 PM   #5
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Aprilaire 500a install


Was there myself. Had a customer drill a hole in his coil and blow all the Freon out. Had to patch it and recharge. Not a cheap job.

Must of scared the heck out of him when it blew.
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Old 11-26-2014, 06:53 PM   #6
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Aprilaire 500a install


Well.....you can't fix stupid....seems like common sense would be to check what's behind where you're drilling.
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Old 11-26-2014, 07:54 PM   #7
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Murphy's law is more common then "Common sense".

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