dometic rml 8555 6.7 liter fridge - Page 2 - Escape Trailer Owners Community

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Old 06-22-2014, 09:38 AM   #11
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The absorption refer needs some contrast in temperature to operate, something that is hard to do in real cold regions. or hot regions!!
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Old 06-22-2014, 10:26 AM   #12
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They need SOME difference - but we had absorption in Africa and it worked fine at 90+ degrees and 100% humidity.

I believe that the RML8555 (large, and maybe the small one, too) fridge have much less cooling capacity than older Dometic fridges. The one we had in the Casita did fine in the full summer heat and sun here in Phoenix. The new one is at best marginal (I would say inadequate) even with fans, improved ducting, etc.
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Old 06-22-2014, 12:58 PM   #13
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Quote:
Originally Posted by cpaharley2008 View Post
Brian,
The purpose of the cover is to keep the combustion area warmer, not to prevent snow intrusion. The absorption refer needs some contrast in temperature to operate, something that is hard to do in real cold regions.
If the cover were only over the burner housing that would make more sense, to allow the burner to get the working fluid high enough for the cycle to work. Airflow through the coils on the back of the refrigerator is required because that part needs to be cooler (that difference in temperature), and at the very least air intake and exhaust is needed for the burner if running on propane. All of the images that come up in a Google search for "Dometic winter cover" show covers that block the vents.

A Dometic catalog confirms that they cover the vents, says that they are for low-temperature operation... and provides no indication of how the exhaust is handled. It appears that they have small openings lined up with the burner intake and exhaust which are just sufficient.
Quote:
Winter sets for single- and double-door models:
WA 120 / 130 are available as replacement covers. EWS 300
enhances your fridge’s insulation values and ensures
maximum performance even at ambient temperatures
reaching –30°C.
I have found in low temperatures (-10 C and lower) - with a larger and different-brand trailer - that the refrigerator section stays at the desired temperature but the freezer isn't cold enough. The cooling action required to keep the refrigerator at 4 C (40 F) isn't enough to keep the freezer well below freezing.

Thousands of people in North America use their RVs with this type of refrigerator in sub-freezing temperatures every year. If the covers work, and are not offered here, it suggests to me that Dometic has had difficulty with some sort of regulatory approval.

This has been educational!
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Old 06-22-2014, 03:24 PM   #14
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So what kind of performance have people had using the large fridge at freezing temperatures ?
BTW, after running the furnace and hot water tank, I still could not get the pilot to light.
Finally traced the problem to an unconnected wire at the propane valve control. duh.
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Old 06-22-2014, 04:27 PM   #15
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Seems to me if the freezer does not cool adequately at temperatures below freezing, just store the item outside. As long as the beer is cold enough, I'm a happy camper!!
Seriously though, I had no issue last winter the few times I managed to shovel out the camper. Hoping this winter is a cold but dry season. I'm a winter camper by choice, dislike the hot sun and a/c crowds, like the brisk and fire season with deserted campgrounds.
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Old 06-22-2014, 05:21 PM   #16
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Originally Posted by cpaharley2008 View Post
Seems to me if the freezer does not cool adequately at temperatures below freezing, just store the item outside. As long as the beer is cold enough, I'm a happy camper!!
Funny guy. Unfortunately, a freezer should be at about -18 C, so if the outside temperature gets higher than that the great outdoors is not an alternative.

I'm currently not all that concerned about keeping an RV properly functioning well below freezing, but the problem illustrates the problems with typical absorption-type RV refrigerators. It is very good that they can run on propane (the only reason they are the RV standard), and they're quiet, but everything else about them is undesirable.
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Old 06-22-2014, 07:08 PM   #17
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Yes, I understand. Perhaps the 12v compressor models maybe a better choice. I had dual 12v units in my T@da, I think they were 1.7c/f each. They would hum while operating.
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Old 06-22-2014, 08:23 PM   #18
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Quote:
Originally Posted by Brian B-P;
great outdoors is not an alternative.

.

Nvm. Edit
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