2017 Dometic AC fan is quite loud. - Escape Trailer Owners Community

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Old 04-15-2017, 05:52 PM   #1
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Question 2017 Dometic AC fan is quite loud.

Hi all

First time we have used the AC to cool our new 21' escape.

Stock Donetic unit.

It pumps out a lot of cold air but the fan is on high, and quite loud.

It is way way louder than the AC was in our 2011 casita.

I can't find an obvious way to throttle down the unit. So it is less loud.

I don't think It is defective. Just over achieving.

;-)

We have the fan to AUTO.

Plus when it has reached 72 degrees (what the wall thermostat is set to) in here it does not make less noise.

Just keeps cooling. And blowing.

Fan does not slow down.

So maybe something is amiss ?

Probably 68 degrees in here now. Still cold air coming. (Tho not as cold)

Thanks for any tips and thoughts.

John.
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Old 04-15-2017, 06:16 PM   #2
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Quote:
Originally Posted by Losangeles View Post
Hi all

First time we have used the AC to cool our new 21' escape.

Stock Donetic unit.

It pumps out a lot of cold air but the fan is on high, and quite loud.

It is way way louder than the AC was in our 2011 casita.

I can't find an obvious way to throttle down the unit. So it is less loud.

I don't think It is defective. Just over achieving.

;-)

Plus when it has reached 72 degrees (what the wall thermostat is set to) in here it does not make less noise.

Just keeps cooling. And blowing.

So maybe something is amiss ?

Probably 68 degrees in here now. Still cold air coming. (Tho not as cold)

Thanks for any tips and thoughts.

John.
Is the fan set to high or is it set to auto. Go to the fan position on the thermostat and make sure it is on auto.
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Old 04-15-2017, 06:16 PM   #3
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Tap the control until you see the fan icon and select low. That is a little bit better.

Edit, we had ours on auto and after 30 minutes of it roaring looked in the manual and selected low.
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Old 04-15-2017, 06:38 PM   #4
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Don't know where the thermostat is on a 21, but on our 5.0TA it's around the corner from the A/C facing the loft. If I check the location of the thermostat with an instant read, it cools down a lot slower then the dinette/kitchen area. We can get the dinette area down to 60 with the thermostat still at more then 70. An indoor/outdoor thermometer mounted on the wall over the fridge would get down into the 50's, one of the side vents blows right on it.

Fix for us is to adjust the vent baffles, open the side facing the loft, close the 2 side vents, just crack the side towards the dinette and the bottom vent. Cools much more evenly this way.

Occasionally, our A/C compressor shuts down momentarily shortly after first starting the unit, it then kicks back on. Experience shows when this happens I know it's going to never stop cooling. When I catch it I turn off the A/C via the thermostat, when it shuts down I just restart it and it runs just fine afterwards.

Talked to a local Dometic tech, he tells me I can pull off the inside cover and tighten all the connections on the control board, which is supposed to be right there. That's what he would do on your first service visit. Being an intermittent problem, you may have it in multiple times. I have yet to do so.
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Old 04-15-2017, 07:06 PM   #5
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Quote:
Originally Posted by wetzk View Post
Tap the control until you see the fan icon and select low. That is a little bit better.

Edit, we had ours on auto and after 30 minutes of it roaring looked in the manual and selected low.
I had it on auto.

I remember being advised at orientation that auto is best. I forget why.

Tho I can switch the fan from high to low to auto.

In low it is a bit quieter, but still pretty loud.

Hmmmmmm.

John.
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Old 04-15-2017, 07:45 PM   #6
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If your 2011 Casita was fairly quiet, you were lucky. I follow the CasitaForum and everyone over there is $%^& about the new Mach 8. They're all trying to order the older model.

Sorry I have nothing to offer, I don't have A/C... just pre-wired.
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Old 04-15-2017, 07:51 PM   #7
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Ours is set to auto when we use it and when it reaches temp it pretty much shuts down. It is fairly loud when compressor kicks in and it's cooling but pretty quiet when reaching temp, so I'd go with something is amiss.
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Old 04-15-2017, 08:13 PM   #8
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I know nobody wants to hear to rip their overhead A/C off their new trailer, but I will say it. Rip that obnoxiously loud white box with antiquated HVAC technology off your roof. If I lived in the southern US I'd probably be installing mini-split heat pumps for other trailer owners and working with a manufacturer on a horizontal condenser that could be roof mounted. I know it costs some money and won't work with every trailer configuration, but being able to hold a conversation and sleep peacefully in the trailer with the A/C on....priceless.

I spend countless hours working with designers on proper acoustics for commercial HVAC systems. It bothers me that RV air conditioner manufacturers have not improved their products and that trailer manufacturers have not demanded better for their customers. The technology already exists. Customers are complaining. It just needs to be packaged and executed properly.

Custom Air Conditioning Retrofit

https://m.youtube.com/channel/UCRqH4W-MD1R4nHj84Exw_iw
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Old 04-15-2017, 08:26 PM   #9
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Padlin, ours must have the same problem when in auto. It will shut off and instantly start back up with the compressor running. In low it does not do that but the fan stays on all the time. Still working on bugs. So far if it is damp or raining the grey water sensor screws up and the display reads 2/3rds full when empty. And the door handle takes a lot of force to open the latch if the trailer is moved. It's fine after the initial opening. I greased it and no luck. I guess I'll try checking the connections in the thermostat.
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Old 04-15-2017, 08:50 PM   #10
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The fan will shut off completely for a few seconds when it changes from high fan to low fan as it gets within a few degrees of setpoint if the fan is set in the auto position. This is normal. The thermostat may take a while to settle down if the trailer was hot and over cool the areas closer to the unit. Close the vents that blow down and in the areas that are cold and make sure the one blowing air toward the thermostat is wide open.

They are noisy no matter what even on low speed. I do find the Dometic to be quiter than the Coleman we had in the Casita.
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