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Old 07-22-2015, 02:45 AM   #1
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Air conditioner ducting

My question is how the ducting is connected. When only my rear A/C is running I'm getting cool air out of my front return vents. Awhile back I had both units running and according to the thermostats it only got down to about 82. It was 95 outside and very humid. Dealer stated that he hasn't heard from other customers of units not cooling down more. He thinks that below the A/C unit is a plenum that splits the intake and supply and that it may be misaligned. Anyone in the past have this.
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Old 07-22-2015, 04:16 AM   #2
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I can't speak for the plenum but air conditioners use the same ducts so yes, regardless of which air unit you are using, it comes out of all your ceiling vents. I have heard others complain that there is some blockage where the vents go into the ducts.
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Old 07-22-2015, 04:57 AM   #3
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Sounds like the divider between the return air and the output air on one or both of the AC units has come loose. There was a post on that here on the forum but I can't remember what it was labeled. The giveaway is that you have air flow FROM your returns. If the return air and output air mixes it would seriously cut down flow.

Not a huge job but involves getting on roof and taking covers and shrouds off unit.
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Old 07-22-2015, 03:19 PM   #4
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Here's the thread

http://www.redwoodowners.com/forums/...tion-2609.html
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Old 07-22-2015, 03:43 PM   #5
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Quote:
Originally Posted by atom ant View Post
Good find! Thank You, this is something everyone should take the time to check. Like is said in the thread it would affect heat pump operation too.
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Old 07-24-2015, 03:58 AM   #6
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Just had this same problem fixed. Dealer said that there is inadequate return lines and added another to help unit breathe. Haven't been back out yet, but fixin' to move into it full time in a week or two. At least until Feb. when new house is finished.
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Old 07-25-2015, 02:02 PM   #7
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Please let us see your new modifications on the returns. Was toying with that idea but not brave enough to make holes in the ceiling.
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Old 07-25-2015, 05:45 PM   #8
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Cleaning the return filters is also important. Depending on where you are staying, they can get dirty fast.
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Old 07-25-2015, 05:59 PM   #9
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Will post pics when we get the trailer back next week (hopefully). They have been waiting on new door replacement, then have to paint it after install...we'll see how that goes. If nothing else, I have learned to lower my expectations as to RW and dealer service!
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Old 07-25-2015, 08:44 PM   #10
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Quote:
Originally Posted by piper guy View Post
Sounds like the divider between the return air and the output air on one or both of the AC units has come loose. There was a post on that here on the forum but I can't remember what it was labeled. The giveaway is that you have air flow FROM your returns. If the return air and output air mixes it would seriously cut down flow.

Not a huge job but involves getting on roof and taking covers and shrouds off unit.
I replaced an LED fixture and when I pulled it out I had cold air blowing out of the roof. Checked air returns and the same thing.
went up on the roof today and found that the foam on the front air conditioner had come out between the intake and exhaust. I reinstalled it and completely covered up all gaps in the entire enclosure with aluminum duct tape. Now it works like it should. The main air conditioner was fine
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