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Old 07-23-2013, 11:39 AM   #1
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Loud AC '12 Apex

We have a new 2012 Apex. It has the loudest AC I've ever heard. It's quiet on the outside, but when your inside and the AC kicks on it's so loud you have to really raise your voice to have a conversation, or if we're watching TV you have turn the volume up. Anyone else have this problem and is there a fix I can do? It's still under warranty, but just wondering if this is normal for a new AC or if I can fix it?
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Old 07-23-2013, 02:22 PM   #2
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trebord

Funny, we had the same problem all this week. I finally looked at the owners manual, and found the fan was on hi, not auto. At the thermostat, we changed it to "auto" and what a difference.
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Old 07-23-2013, 05:00 PM   #3
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Checked that and it is on auto. Doesn't run all the time just so damn loud when it does.
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Old 07-23-2013, 05:09 PM   #4
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We had that problem on our previous RV, a Thor ACE. Our current unit, a Thor Challenger, is much quieter. In our case I think it has to do with the thickness of the roof and the amount of insulation. The ACE roof was about 3 inches thick, the Challenger is more like 5 inches. Not much you can do to change it. One other thing I've heard can cause excessive noise is if the mounting bolts are overtightened. The inner and outer units are held together with usually 4 bolts and there is a foam seal sitting on the roof. If the bolts are overtightened the foam will be compressed so the unit is riding hard on the roof. There should be a torque spec for the bolts, you'll have to check the AC manufacturer's web site for that. The seal may need to be replaced if it has been squashed flat.
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Old 07-24-2013, 03:28 AM   #5
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Old 07-26-2013, 06:55 PM   #6
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Quote:
Originally Posted by bdickson View Post
The inner and outer units are held together with usually 4 bolts and there is a foam seal sitting on the roof. If the bolts are overtightened the foam will be compressed so the unit is riding hard on the roof. There should be a torque spec for the bolts, you'll have to check the AC manufacturer's web site for that.
The industry standard is to tighten the 4 bolts until you compress the gasket by 50%. They are usually about 1" think so you pull the unit down until it's 1/2" from the roof. A lot of AC units have little plastic indicators on them to guide us RV techs. You tighten the bolts until the plastic hits the roof.
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