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Old 08-13-2016, 06:23 PM   #1
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Temperature mismatch

Our 2013 FC Dometic refrigerator is acting weird. The temperature on the thermostat has been slowly steadily rising the past few days and is now up to 47 despite the fact that the freezer and fridge compartments remain nicely cold and both even have ice in them! Confession: the AS was parked at somewhat of a steep angle for 2 days. Any advice?
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Old 08-13-2016, 06:40 PM   #2
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Fridge works best when relatively level.
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Old 08-14-2016, 09:55 AM   #3
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Since your ammonia/absorption fridge relies on gravity to perform much of the internal refrigerant circulation, your unit should be relatively level.

Prior to 1995 or so, the makers of RV fridges required the unit to be 'bubble level' and many folks used a level on the freezer floor to determine the level state of the unit.

Newer units only require a relaxed state of leveling, defined as having the RV 'comfortable to walk in'

While exact, precise leveling is no a requirement, damage to your cooling unit can occur by repeated or lengthy operation in an 'off level' state.


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Old 08-16-2016, 08:00 AM   #4
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Quote:
Originally Posted by cdfriend View Post
Our 2013 FC Dometic refrigerator is acting weird. The temperature on the thermostat has been slowly steadily rising the past few days and is now up to 47 despite the fact that the freezer and fridge compartments remain nicely cold and both even have ice in them! Confession: the AS was parked at somewhat of a steep angle for 2 days. Any advice?
Your owners manual should have a section on this.
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Old 08-16-2016, 08:52 AM   #5
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In over 25 years I have never been able to get a Dometic frig to work to satisfaction.

The problem you describe, warming over time, is the problem I have been plagued with. The frig will drop to 34 degrees, while empty, the day before we go out. Each day after that the temperature creeps up until after 5 days in in the mid 40s. Some will come back and say the frequency that the door is opened will effect it and yes that will. The problem is there is minimal recovery over night.

I have rebuilt the area behind the frig, with sheet metal, to achieve the clearance Dometic suggests. I have installed pillow insulation between the side walls of the frig and the trailer walls. I have installed several different configurations of fans behind the frig. I have installed a fan inside the frig. And I have read Onna Lee Ford's bible on RV frig operation to no avail.

Yes the freezer keep ice cream, the standard of proof for operation, through out our stays.

Having managed commercial air conditioning all my career so I have some ideas of cause and effect. It usually only takes me a year or 2 to redesign my TVs for the operation I want. But 25+ with no results you can't imagine my frustration
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Old 08-17-2016, 09:24 PM   #6
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The old saying. "You can't make a silk purse out of a sows ear" applies here.
I believe the Danfos units will eventually replace the absorption refers.
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Old 08-18-2016, 08:33 AM   #7
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Originally Posted by TG Twinkie View Post
I believe the Danfos units will eventually replace the absorption refers.

I agree. I can see that being started by insurance companies requiring there use is the higher priced motor home or no insurance covering fire damage.

Wait till the environmentalists realize that ammonia is used in the absorption units and is harmful to pregnant woman.
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Old 08-18-2016, 08:53 AM   #8
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I have recently seen several SOBs advertising using Danfoss type fridge units in their newer trailers. RV technology is still about 20 years behind the marine industry but slowly catching up. Airstream might take another 10 to even come close.
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