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Topic ClosedDead Dometic RM8501

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spydie View Drop Down
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Direct Link To This Post Topic: Dead Dometic RM8501
    Posted: 20 Aug 2017 at 4:31pm
I installed a 3" computer fan at the top vent and it significantly helped with the cooling.  So I took out that stupid 3" fan Dometic or FR put on the bottom of the coils that only turns on when it's way past time you should have some cooling help, and I then mounted it next to my first 3" fan.  Not sure two fans do much more than 1 fan, but I figured, "why not?".  each fan draws about 0.15-0.16 amps so I have better cooling for about 3/10s of an amp and I put a switch on them so I can manually turn it off in colder weather when I don't need the help.  Forest River has never replied to the dealer's complaint yet.  It's still several degrees more efficient on electricity than it is on LP but I guess I'll just have to live with that.  I'm able to keep it under 42 degrees now (just barely) in 99 degree weather in the middle of the day.  It gets down to 32-34 degrees at night (depending whether it's on electricity or LP).
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Direct Link To This Post Posted: 17 Aug 2017 at 10:57pm
I predict that within 5 years we'll be using Thermal Electric Generators (TEGs) to produce the 12 volts we need to run our swing-compressor refrigerators and the power will be produced by an LP flame that we now use for our absorption refrigerators.  We've had TEGs in the military and commercial world for decades and they are just now starting to get to be more efficient and cost affordable.  I think those would be the salvation for the obsolete absorption refrigerator.  And they might even be able to extend dry camping times if we can get enough out of them to run the refrigerators and keep the batteries charged.  Kinda like a solar panel that runs on an LP flame.  But of course then we'll have to carry more LP! LOL . Nothing is free
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Direct Link To This Post Posted: 17 Aug 2017 at 10:23pm
Ha ha. Yes. I just tested my Engel chest freezer/refer on an 80 watt solar panel and 75 amp/hr deep cycle battery and it can easily keep up. The Engel draws only about 30-40 watts or about 1.7 average amps per hour. Swing compressors draw little current. I used a built in one in my last RV for almost four years on about 200 amp/hr of batteries (three 12 v batteries ) and we dry camped all the time. Spent six weeks going to Alaska and only spent three nights in campgrounds. It's possible to run a 12 v compressor refrigerator in place of the dometic with only slightly more battery power and a solar panel really helps.
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Direct Link To This Post Posted: 17 Aug 2017 at 10:13pm
Originally posted by spydie

In my opinion, which isn't worth much, I think the absorption refrigerator is antiquated and needs to be abolished.  They've never been efficient in an RV if you travel in warm/hot weather.  They were developed for household use and I'm sure they are fine in that capacity, but even then they were replaced with more efficient compressor refrigerators.  So what did we do?  We took something that was replaced with something better for the household, and tried to put them into RVs where the OAT has a major affect on them.
With you there ;)  But is there anything on the horizon that is capable of replacing the absorption fridge?  Ie., a refrigerator that runs with minimal to no electric power?  Something that does not use electrical power for the cooling process itself?  Something that does not require 200-400W of solar and golf cart batteries?  

Paul
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Direct Link To This Post Posted: 17 Aug 2017 at 9:19pm
At 80-85 degrees it may work ok. We are talking 95-100 temps here in the great SW. Dometic will only accept temperature measurements via water test. A glass of water measured with a bulb thermometer. My temps were carefully measured the only acceptable way and monitored by dometic. 34-36 degrees at night when it's less than 70s degrees outside and climbs into high 50s and low 60s during the day in 95-100 degree heat . That's totally unacceptable for camping. 42 degrees is the least acceptable for dairy products.
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Direct Link To This Post Posted: 17 Aug 2017 at 9:10pm
Sooo, after all this...

What is the consensus for "proper" or "adequate" cooling? Speaking for myself and measuring carefully with "normally" full freezer and refrigerator areas, I have no problem maintaining 31-36 degrees in fridge and 10-20 in freezer. Using digital (Accurite), analog and Thermopen, I've been doing some testing the last few days in my driveway. Full sun and 80-85 degrees, no AC running (so it's 90+ in pod). I have tested both AC and propane. To simulate normal packing, I have several prefrozen freezer packs in freezer portion and two six-packs of 16 oz. soda in fridge.

BTW, an evaporator (fin) fan is a total waste of money in the fridge. I'll write more about that later. Suffice to say fan motors give off more heat than the benefit of moving air *in* the fridge.

Just curious if anyone has any one else has carefully measured fridge/freezer temps in their rPod?

fred




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Direct Link To This Post Posted: 17 Aug 2017 at 5:21pm
Just picked up my Rpod at the dealer.  Dometic says it's not mounted properly and it's all Forest Rivers fault.  It doesn't have enough space around it so it can breathe and cool properly (the insulation is packed way too tight and the sides of the Dometic get hot).  Dometic looked at 15 pictures the dealer sent them of the installation and they said there's no way it can cool properly in there, there's no space around it.  All the information has been sent by the dealer to Forest River to see what their reaction is.  Probably won't hear from them, but if we do, they won't take any blame with "we've been building them like that for years and nobody else has complained."  (yah, right!).  Buyer beware.  Anybody want to buy a real nice 2018 rpod 176?  Cheap!  NEVER USED FOR CAMPING.  LOL
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Direct Link To This Post Posted: 17 Aug 2017 at 3:35pm
In my opinion, which isn't worth much, I think the absorption refrigerator is antiquated and needs to be abolished.  They've never been efficient in an RV if you travel in warm/hot weather.  They were developed for household use and I'm sure they are fine in that capacity, but even then they were replaced with more efficient compressor refrigerators.  So what did we do?  We took something that was replaced with something better for the household, and tried to put them into RVs where the OAT has a major affect on them.

I have heard from a lot of people on different forums about the lack of the Dometic working properly in the Rpod, and there's no correlation between which models it's in.  There's a small chance that Forest River needs to re-design the mounting area.  The only people that aren't complaining much are the ones that live in cooler climates than the HOT southwest and never travel to hot climates in the summer, so they don't really know how bad an absorption refrigerator is.  Other people just give up and carry an ice chest or, like me, a real compressor chest/freezer along for the campouts.  Of course the Rpods are built in Indiana and Washington... they don't know what hot weather is and have never researched it so they have no idea that their design, if improved, could solve the problem of the inefficient Dometic.  And they don't care.
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Direct Link To This Post Posted: 17 Aug 2017 at 3:26pm
Originally posted by spydie

They told me that when they had it on the bench they took the jet out and cleaned it in alcohol.
Well, so much for my best shot ;)  If the jet is clean and the pressure is within spec, not sure what else it could be.  

Do we know for sure that simply swishing it in alcohol is sufficient?  When I cleaned mine it was alcohol in an ultrasonic cleaner, which might have been more thorough.  

Mounted it incorrectly?  How is that even possible?  That said, when I was talking to Dometic, they raised the possibility it was not level in the trailer.  Again, not sure how THAT is possible either so I guess they are just taking pot shots.  

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Direct Link To This Post Posted: 17 Aug 2017 at 3:15pm
OK, just got back from the RV dealer.  They've been working with Dometic for the last week (again) and Dometic now says it's a Forest River problem.  Forest River did not mount the Dometic correctly.  He is now working with Forest River (sent them 15 pictures) and waiting to hear from them.  We all know that FR isn't going to take ownership of the problem any more than Dometic will unless there's a class-action lawsuit that forces them to recall the R-pods and mount the Dometic differently.  So I'm pretty sure that after the dealer has it another week, they'll tell me it's my problem because nobody wants to fix it.  My options at that point are 1. only camp in colder weather so the refer works OK or 2. replace the Dometic with a real refrigerator like the Engel I built into my last RV or 3. trade it off for another brand that may or many not work better.

By the way, they pressure tested the LP both in the Rpod and on the bench to make sure it was OK in both settings.
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