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Old 07-26-2016, 08:48 PM   #1
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Salem Hemisphere 368rlbh extremely loud a/c

We have whatever roof a/c that came stock on our unit. It seems to run extremely loud all the time when it is on. It's so loud that you can't even sit inside and have a conversation without yelling at each other. Is this normal? Any input would be greatly appreciated
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Old 07-27-2016, 07:49 AM   #2
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That is not normal. If it is new, I would take it back to dealer and have them listen to it. You could also listen to others with a similar unit. It should not be that loud.
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Old 07-27-2016, 07:53 AM   #3
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Might be a silly question, but is the air dump open? I know ours are super loud with the dumps open.
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Old 07-27-2016, 08:50 AM   #4
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What brand is the thermostat? That will tell us what brand the A/C is.

There have been several complaints of the Coleman Mach 8 units being loud.

As dwayneb236 said, they're all kinda loud if you have the air dump open.
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Old 07-27-2016, 10:16 AM   #5
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It has a dometic digital thermostat. And I'm referring to using the ducts and not dump
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Old 07-27-2016, 11:10 AM   #6
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Yes they are loud. That is the biggest complaint I have with our AC unit. The airflow is just to loud.


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Old 07-27-2016, 12:35 PM   #7
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While the Dometic 15k units are loud, they shouldn't be as loud as you described.

Is it a constant drone, or does it sound like something out of balance?
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Old 07-27-2016, 12:42 PM   #8
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Inside shroud

I would start by removing the inside shroud and watch the fan turn and see if it has a bent blade. With the inside shroud removed you will be able to tell if it is inside or outside. If the inside fan is not making the noise then you may have to climb on the roof and take the outside shroud off and have some one turn the a/c on and see if the noise is the outside fan. look also at the bolts holding the compressor to the unit.
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Old 07-27-2016, 05:12 PM   #9
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Originally Posted by Cooperville View Post
We have whatever roof a/c that came stock on our unit. It seems to run extremely loud all the time when it is on. It's so loud that you can't even sit inside and have a conversation without yelling at each other. Is this normal? Any input would be greatly appreciated
my coleman/mack 13.5 is loud as well. we can have a conversation though but it's louder than i would like.
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Old 07-27-2016, 06:14 PM   #10
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Our 15k is loud enough that you have to double the volume on the TV when the AC is on. Our old 13.5k AC was just a tad quieter.
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Old 07-28-2016, 12:33 AM   #11
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Quote:
Originally Posted by Cooperville View Post
We have whatever roof a/c that came stock on our unit. It seems to run extremely loud all the time when it is on. It's so loud that you can't even sit inside and have a conversation without yelling at each other. Is this normal? Any input would be greatly appreciated
When shopping for a trailer make sure the A/C is ducted. Our previous trailer, a Rockwood Mini-Lite didn't have ducted A/C and it was LOUD. Our Wildwood's A/C is ducted into the ceiling and in comparison to the Mini-Lite is quiet. Not quite as quiet as our home A/C but not a lot noisier either. It's worth the few dollars more to get it.
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Old 08-01-2016, 02:41 PM   #12
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Yes it's a constant drone. Doesn't sound like anything is wrong with the fan. Just overall a loud running unit. I have a couple of follow up questions for you all. What temperature should the air coming out of the unit be? So I can get an idea if it is operating properly. Also, understanding the construction of campers, is it normal for the unit to almost never shut off when the outdoor temperature reaches around 80? Is this just the way it is with a camper due to the lack of insulation or should I get a bigger or second unit to gain better efficiency? Keeping in mind the unit is parked in full sun.
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Old 08-01-2016, 06:17 PM   #13
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The delta-T (difference between intake and return) should be about 15ºF or so.

It's normal for the A/C to run full time once the outside temp gets above 80ºF.

Adding a second A/C will certinly help, especially since you're in full sun.
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Old 08-01-2016, 07:06 PM   #14
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Thank you for the replies
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Old 08-13-2016, 08:31 PM   #15
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We have the same A/C in our 282RK and you definitely have to have the TV volume up when it is running. I just figured this was normal.
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Old 08-23-2016, 05:57 AM   #16
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We have the same A/C in our 282RK and you definitely have to have the TV volume up when it is running. I just figured this was normal.
"Ditto" in our similar Hemi 272, louder than the 15K in our Heartland. But hey, it will keep it cool, but does run constantly when temps are in high 80s.
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