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Old 09-26-2013, 08:38 PM   #51
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Anyone tried slowing down the AC fan speed with a resistor or rheostat switch?
I would think you could find a balance between freezing the coil and less internal fan noise.
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Old 09-28-2013, 02:37 PM   #52
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The Dometic fan motor draws 2.6 amps at 120v, or a 312 watt load. A rheostat (or resistor) in series with the fan will drop 1/4 the wattage of the load at the worst voltage (60V at the motor & 60 volts at the rheostat). That means you need a 78 watt resistor or rheostat which is fairly large, and could be radiating a fair amount of heat. If you're using non variable resistors to drop lower voltages, you could get away with less wattage, but it is still going to be large.

While I would be concerned with icing as Dave noted since even a 9600BTU AC is often overkill for small fiberglass trailers, if you want to slow down the fan motor, a motor speed control would probably be a better idea, although you need to shop carefully - many of them specifically state they are not for capacitor start or run motors.

Another possibility would be an autotransformer (a Variac, not the RV Autoformer) that can be used to vary AC voltages, however that may cause a starting problem. Of course you would not need the case that is part of the Variac I linked to...
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Old 02-11-2016, 07:49 AM   #53
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Mach 8 hush kits

If anyone is still needing to quieten a Coleman Mach 8 A/C you may be interested in a solution that the Casita folks asked us to develop. Full details here: Mach 8 hush kits

Cheers,
Jim
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Old 02-11-2016, 12:45 PM   #54
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Looking through this thread I can remember this discussion. We ended up with the Polar Cub -- even though it was discontinued -- because Escape had a few left over. I think it was about $300 more and actually one inch higher than Dometic. It worked out really well -- the noise is not an issue and it has cooled down the trailer when we needed it. I wonder if Escape still has some in stock.
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Old 02-11-2016, 01:32 PM   #55
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Quote:
Originally Posted by Ruthe View Post
Well, it looks like discussion of Polar Cub is moot since the tech guy just told me it's been completely discontinued and has been replaced with the Mach 8, which someone mentioned, but I couldn't find the comment. The tech guy says it's about the same decibel level inside as the Polar Cub, but it's noisier on the outside.
Casita is using MAX 8 (9,000 BTU, low profile) now with an option for a MAX 1 PS (11,000 BTU, higher profile) on request. MAX 8 being louder outside and quieter inside..the opposite of the MAX 1 PS. With the MAX 8 noise issue for some users/buyers, Casita has tried to substitute the Dometic Penquin II but for whatever reason it does not work in the Casita...just a guess but it might be a mechanical issue like roof profile/size/mounting issue.
The Dometic Penquin II low profile is supposed to be quieter than the previous Penquin and requires less current to run.
Another guess, but as AC units go low profile with redesigned air flow/compressors and refrigerant change (higher pressure)...maybe all AC units are going to get nosier on the outside of the trailer....so eventually when all trailers in campground have the new units the whole place will be noisy and you will not be able to identify the trailer with the newest AC unit Or BRAND by its noise level.
just an opinion and a guess....more technical info or facts would be welcome.
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Old 02-11-2016, 01:50 PM   #56
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Originally Posted by widgetwizard View Post
If anyone is still needing to quieten a Coleman Mach 8 A/C you may be interested in a solution that the Casita folks asked us to develop. Full details here: Mach 8 hush kits

Cheers,
Jim
MAX 8 noise issue is a mess. While that MAX 8 Hush kit is interesting when considering a Casita , it shows the tough place Casita finds themselves if they cannot use the Dometic Penquin II (which supposedly is quieter) as a substitute. So a new Casita buyer has to pay more to fix a brand new factory MAX 8? Maybe someday Coleman will engineer a better new MAX 9!
Oliver switched from Coleman MAX 8 to Dometic Penquin II too.
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