Dometic RMD8555 Frustration - Page 13 - Escape Trailer Owners Community

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Old 08-05-2016, 01:24 PM   #121
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Appliances designed to work with low pressure (11"wc pressure) work best when the pressure is in that range. When I installed the MEGR -253H I measured the pressure at 12. That was in the acceptable range so I didn't adjust it. The stock regulator measured 10, but it fluctuated a bit. The new one did not. Perhaps that's the difference.
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Old 08-05-2016, 02:04 PM   #122
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I beleive you are right. Its the variation thats the killer, not the level. A larger header hose would help but those are frowned upon.

We have spent 25 days in our 19 so far this summer. We have 320 watts of solar (theoretical max) in two fixed panels on the roof. We have an RMD 8555 fridge.
We travelled with the fridge on 12V (solar), including rest, lunch and gas stops. Throughout all that our fridge kept at 7C with three bars and 5C with four bars. The solar had no problem maintaining the fridge. Some days we would draw down the batteries a little and others we would maintain and even gain. We found its best to minimize fridge door open times. Ambient temps were from 11C to 30C.

Prior to trying the solar stress test we ran the fridge on propane and at elevations from seal level in Prince Rupert BC to 7600 ft at the kootenay skyway. We live at 3600 ft ASL. The propane never failed to light first time every time.

So all in all we are fairly happy with our fridge performance.

John
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Old 08-05-2016, 02:17 PM   #123
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Quote:
Originally Posted by rbryan4 View Post
Appliances designed to work with low pressure (11"wc pressure) work best when the pressure is in that range. When I installed the MEGR -253H I measured the pressure at 12. That was in the acceptable range so I didn't adjust it. The stock regulator measured 10, but it fluctuated a bit. The new one did not. Perhaps that's the difference.
Smoother is better! Changed ours out to same as yours so we'll see. Thanks

Which device did you use to measure? I see tube with dye and pure electronic.
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Old 08-05-2016, 03:21 PM   #124
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Quote:
Originally Posted by rbryan4 View Post
... The stock regulator measured 10, but it fluctuated a bit. The new one did not. Perhaps that's the difference.
Bingo.
Ideally any regulator would put out a constant pressure, but in reality that doesn't happen, ever. Even though RV propane regulators are two-stage (so they should be more consistent than the single-stage regs used for grills), the output pressure still varies with input pressure (which way depending on regulator design and operating conditions), and with flow (higher flow causes less output pressure).

A high-flow regulator will likely drop less from the desired pressure as flow increases than the standard regulator.
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Old 08-05-2016, 07:04 PM   #125
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Which device did you use to measure? I see tube with dye and pure electronic.
I just use a cheap Dwyer tube manometer like this one. But you can easily make your own with some plastic tubing.

http://m.rverscorner.com/?url=http%3...referrer=#2684
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Old 08-05-2016, 07:17 PM   #126
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This one is a little more money but is easier to use.

https://www.amazon.com/Yellow-Jacket...ssure+test+kit
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Old 08-05-2016, 08:22 PM   #127
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Cost me $2 for 5' of 5/16 ID tube and about an hour to make one.
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Old 08-05-2016, 08:53 PM   #128
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Cost me $2 for 5' of 5/16 ID tube and about an hour to make one.
I use it several times a week in my business so a $2 price of tubing don't cut it. Need something that stays in the truck box.
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Old 08-06-2016, 08:37 AM   #129
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Dangling Thermistor

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Originally Posted by Drumstick63 View Post
Another Update On Replacement RMD8555
I originally started this post last fall and gave an update earlier this summer on our replacement RMD8555. I thought I might give a new update as my wife and I just spent seven nights at Topsail Hill State Park in Florida with some pretty hot weather (heat index over 100 some days).

The only thing that I have changed since our earlier trips was to move the Thermistor off of the fins and move the External Fan Thermostat right next to the water tray. I moved the External Fan Thermostat down the pipe and right next to the water tray as the location were it was originally placed seldom got hot enough to turn the fans on. This new location is closer to the heat source and seems to get hotter. Keep in mind that we freeze water bottles before our trips and place in both the fridge and freezer.

From the time we left until we returned home, the fridge temperature ranged from 27F to 35F. The 35F reading came while traveling with the unit on battery. We saw 34F one time while camping when we loaded some items from the grocery store. For 98% of the trip, the temperature ranged from 28F to 32F, with the temperature staying 30F to 31F most of the time.

This might be a little on the cold side as grapes were covered in a thin layer of ice when removing them from the fridge. We even had water bottles still frozen solid in the fridge after seven days. We are still happy with our replacement RMD8555. Hopefully this performance will continue.

Thanks,
Mark
We have been camping in 100 + during the month of July and have been pleased with our refrigerator temperatures. The dangling thermistor "fix" is all we had done.
Big change from our trip home from ETI in March! The outside air temperature was cooler than the refrigerator!
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Old 08-10-2016, 02:18 PM   #130
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Hi All, Just a little feedback on our RMD 8555 performance this past week-end.
At our home we pre-cooled the fridge on propane for 24 hours, then switched to battery for travel. Everything we put in the fridge was pre-cooled at home. We camped in Red Bluff, Ca., Thursday-Monday and had full hook-ups at about 1100 ft. elev. We switched to shore power for the four days of camping. Fridge settings were on 3 DOTS at all times. Daytime temperatures were 100* F. Nights were high 60's-70*. We were in full sun exposure, with no shade except for awning. We did not put water in the cup, and have never done so.
The freezer and fridge remained ice-cold the entire time. An ice block in the freezer remained frozen, beer and all fridge contents remained ice cold the entire time.

We have the stock RMD 8555 and have made no alterations since pick-up in April '16. We couldn't be happier with the performance. We have no experience with the previous single-door model, or the newer Americana model, but so far we have no complaints with the RMD.
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