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07-23-2020, 08:25 AM
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#1
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Junior Member
Join Date: Sep 2018
Location: Central PA, Pennsylvania
Trailer: 2019 Escape 19
Posts: 14
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Dometic AC dissection for Noise reduction
Apologies up front as I realize this topic has been well covered but I hope to perhaps add a twist.
QUESTION: Has anyone dismantled the standard air conditioning units to see why they are so loud?
I am amazed at how loud the fan is without the compressor running which leads me to believe that a different fan/set of blades could be quieter. I suspect the fan was specified not for the noise signature but for some other reason like cost, simplicity, durability etc. In general, the fan doesn't seem to have a problem with moving enough volume of air and perhaps moves a bit much for the smaller trailers. My hope is that perhaps a replacement fan disc could be found that significantly reduces the noise signature without significantly degrading performance while being a fairly simple modification. Thoughts?
Cheers
Rob
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07-23-2020, 08:59 AM
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#2
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Senior Member
Join Date: May 2018
Location: Atlanta, Georgia
Trailer: 2018 21
Posts: 252
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I installed sound absorbing sheets on the interior and exterior housings along with some silicone vibration absorbers on the compressor mounts.
Still looking for mounts for the fan to reduce it's vibration.
Everything is much quieter than stock.
I'll post pix next week when we get home if anyone is interested.
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07-23-2020, 09:39 AM
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#3
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Senior Member
Join Date: Oct 2008
Location: St. Thomas not BVI., Ontario
Trailer: 2014 Escape 5.0TA / 2016 Ram Eco Diesel 4X4
Posts: 8,035
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What annoys a noise?
Hi: All... We had to resort to the A/C one evening this past driveway camping trip. For sound deadning I simply stuffed my earplugs in and slumbered away in cool comfort. My big bugaboo now is that I have "Swimmers ear" and can't hear what's being said about me. Sometimes it opens and WOW the world is N O I S Y!!! Alf
escape artist N.S. of Lake Erie
__________________
Quote Bugs Bunny..."Don't take life too seriously, none of us get out of it ALIVE"!!!
'16 Ram Eco D. 4X4 Laramie Longhorn CC & '14 Escape 5.0TA
St.Thomas (Not the Virgin Islands) Ontario
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07-23-2020, 12:48 PM
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#4
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Senior Member
Join Date: Sep 2013
Location: Ventura County, California
Trailer: 2013 19 Escape
Posts: 7,204
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Quote:
Originally Posted by rotorbudd
I installed sound absorbing sheets on the interior and exterior housings along with some silicone vibration absorbers on the compressor mounts.
Still looking for mounts for the fan to reduce it's vibration.
Everything is much quieter than stock.
I'll post pix next week when we get home if anyone is interested.
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Would love some pictures ! Pat
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07-23-2020, 01:17 PM
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#5
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Senior Member
Join Date: Nov 2012
Location: Little Rock, Arkansas
Trailer: 2014 Escape 19' and 2016 GMC Yukon SLT SUV.
Posts: 499
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I would love ideas and instructions on how to reduce A/C noise. Thanks.
Tonny LR
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07-23-2020, 01:29 PM
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#6
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Senior Member
Join Date: Jun 2010
Location: Central, Pennsylvania
Trailer: Escape#5 2022 E19
Posts: 26,268
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There is a fan control switch on the thermostat for a lower speed setting.
__________________
Jim
Sometime life gets in the way of living.......
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07-23-2020, 01:42 PM
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#7
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Senior Member
Join Date: Mar 2016
Location: Burlington Twp., New Jersey
Trailer: 2010 Escape 19
Posts: 7,126
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To get a rooftop A/C quiet you need to start with some of the engineering that Houghton Belaire does. One of the big differences is there is a separate evaporator and condenser fan. Dometic uses a single dual shaft motor to run both fans. Sound deadening with acoustic treatments and vibration isolation is also helpful. Messing with the Dometic is putting lipstick on a pig.
https://www.escapeforum.org/forums/f...tml#post271225
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07-23-2020, 01:54 PM
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#8
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Senior Member
Join Date: Mar 2013
Location: North of Danbury, Wisconsin
Trailer: 2018 Escape 21C
Posts: 3,033
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Check the Casita forum . Several people there changed out the fan blade to a different style and reduced the fan noise considerably .
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07-23-2020, 03:53 PM
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#9
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Senior Member
Join Date: Apr 2017
Location: DFW, Texas
Trailer: 2018 21 Sept 7 2018
Posts: 1,073
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Quote:
Originally Posted by steve dunham
Check the Casita forum . Several people there changed out the fan blade to a different style and reduced the fan noise considerably .
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Steve I for one do not want to subscribe to a new forum. If possible can you post what replacement blade they used.
Tks
David
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07-23-2020, 04:05 PM
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#10
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Senior Member
Join Date: Mar 2013
Location: North of Danbury, Wisconsin
Trailer: 2018 Escape 21C
Posts: 3,033
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I would like to help you but you have to be a member of the Casita forum to access the forum and I am no longer a member
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07-23-2020, 04:05 PM
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#11
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Senior Member
Join Date: Nov 2015
Location: Baytown, Texas
Trailer: 2017 21' Escape - upgraded version
Posts: 2,697
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Quote:
Originally Posted by Oldtimer
Steve I for one do not want to subscribe to a new forum. If possible can you post what replacement blade they used.
Tks
David
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It wouldn't matter - the A/C Casita forum is working on is the Coleman Mach 8 which has different fan blades than the Dometic. If you wish to see it - here are some links:
Mach 8 hush kits
Mach 8 Hush Kit – The Handy Camper
BTW, the Dometic is much quieter than the Mach 8 - the Mach 8 sounds like a jet engine taking off.
__________________
Normal people believe that if it ain't broke, don't fix it.
Engineers believe in fixing it so that it never breaks.
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07-23-2020, 04:13 PM
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#12
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Senior Member
Join Date: Apr 2017
Location: DFW, Texas
Trailer: 2018 21 Sept 7 2018
Posts: 1,073
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Ok then won’t worry about tks
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07-23-2020, 09:05 PM
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#13
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Senior Member
Join Date: Mar 2016
Location: Sharpsburg, Georgia
Trailer: 2005 Scamp 16 SD (sold), 2020 Escape 19
Posts: 261
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Quote:
Originally Posted by tdf-texas
It wouldn't matter - the A/C Casita forum is working on is the Coleman Mach 8 which has different fan blades than the Dometic. If you wish to see it - here are some links:
Mach 8 hush kits
Mach 8 Hush Kit – The Handy Camper
BTW, the Dometic is much quieter than the Mach 8 - the Mach 8 sounds like a jet engine taking off.
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First time I heard that new Mach 8 was a few years ago at the Bluebonnet Casita rally, and we were about 3 rows over!
__________________
Dave and Marilyn
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07-24-2020, 07:12 AM
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#14
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Senior Member
Join Date: May 2018
Location: Atlanta, Georgia
Trailer: 2018 21
Posts: 252
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Quote:
Originally Posted by rubicon327
To get a rooftop A/C quiet you need to start with some of the engineering that Houghton Belaire does. One of the big differences is there is a separate evaporator and condenser fan. Dometic uses a single dual shaft motor to run both fans. Sound deadening with acoustic treatments and vibration isolation is also helpful. Messing with the Dometic is putting lipstick on a pig.
https://www.escapeforum.org/forums/f...tml#post271225
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I agree it's kind of a pig. But it's the only pig I've got!
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07-24-2020, 11:37 AM
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#15
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Senior Member
Join Date: Apr 2016
Location: Austin, Texas
Trailer: 2017 5.0 TA
Posts: 146
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Quote:
Originally Posted by rotorbudd
I'll post pix next week when we get home if anyone is interested.
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Yes, yes, yes, please!
__________________
Thomas G.
2017 5.0 TA
2017 F-150, 5.0L, SuperCrew, 6.5' bed, 4x2, 6-speed, 1:3.55 rear axle; B&W Turnover Ball; Andersen Ultimate Aluminum Gooseneck; Fold-a-cover w/caddy
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07-26-2020, 08:33 AM
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#16
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Senior Member
Join Date: Nov 2016
Location: Williamson County, Tennessee
Trailer: 2019 Escape-21C toad by 2017 Titan XD Crew Cab V8 4x4
Posts: 450
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Quote:
Originally Posted by cpaharley2008
There is a fan control switch on the thermostat for a lower speed setting.
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On our new E21C “High” is 747 on takeoff and “low” is like a 737 on takeoff. It seems like a simple thing the factory could offer wd be an optional third, lower speed . IMHO THESE SMALLER TRAILERS WD BE SRRVED JUST FINE W A LOWER SPEED OPTION
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07-26-2020, 08:38 AM
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#17
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Senior Member
Join Date: Jun 2010
Location: Central, Pennsylvania
Trailer: Escape#5 2022 E19
Posts: 26,268
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I'm surprise none of the electrical engineers have not come up with a "dimmer" type rheostat that could slow down the fan speed and make it variable.......
__________________
Jim
Sometime life gets in the way of living.......
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07-26-2020, 09:40 AM
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#18
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Senior Member
Join Date: Feb 2010
Location: Oswego, New York
Trailer: 2017 Escape 21C, 2018 Ford F150
Posts: 5,363
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Quote:
Originally Posted by cpaharley2008
I'm surprise none of the electrical engineers have not come up with a "dimmer" type rheostat that could slow down the fan speed and make it variable.......
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If the fan runs too slow, the AC will ice. There is a balance between the amount of BTUs produced & the air flow getting them out of the AC.
There are quieter solutions such as the mini splits some have installed. There are ACs designed for the boating industry that are quiet, but are not roof mounted.
I rarely use mine, and almost always shut it off at night, but have had the good luck to be in locations where it cools enough at night to use the Maxx Fan.
I did add a Micro Air Easy Start to my 2017 21's Dometic AC even though it has the Dometic idea of soft start (separate fan & compressor starts). I don't have an amp meter capable of reading start up current, but it definitely has gone down. No more loud thump or temporary voltage drop when the compressor starts. It starts fine on my 2200 watt Sportsman generator (a 276' above sea level) running on propane, although it also started before the Easy Start addition.
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07-26-2020, 12:09 PM
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#19
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Senior Member
Join Date: Feb 2009
Location: Madison area, Wisconsin
Trailer: 2016 Escape 19 Chevy 2012 Express 3500 Van
Posts: 1,734
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What model Dometic AC?
I have a 2016 19' "classic". No manuals came with this used rig. What is the model of AC installed at that time?
Thnaks
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07-26-2020, 12:44 PM
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#20
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Senior Member
Join Date: Jun 2010
Location: Central, Pennsylvania
Trailer: Escape#5 2022 E19
Posts: 26,268
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My 2016 E19 and 2019 E21 have the same a/c and thermostat
__________________
Jim
Sometime life gets in the way of living.......
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