Dometic RM 1282 cooling issues

Topic: Dometic RM 1282 cooling issues (Read 2992 times) previous topic - next topic

Re: Dometic RM 1282 cooling issues

Reply #50 – July 17, 2021, 03:35:51 pm

Is there any cooling component behind the aluminum plates below the ice maker area that should have there conductive paste replaced? Area around icemaker with fridge doors removed operates at -25 degree just amazing little Freon cooling unit. Wish the ammonia cooling unit worked this well. Hopefully new one will work better than old.

Re: Dometic RM 1282 cooling issues

Reply #51 – July 17, 2021, 07:07:49 pm

Removed bottom panel and exposed this line that attaches to cooling unit with conductive paste and bottom plate. Will replace conductive paste and reinstall. Not going to disturb Freon system for fear of damaging it. Is this just to transfer cooling in freezer from top to bottom?
Scott

Re: Dometic RM 1282 cooling issues

Reply #52 – July 20, 2021, 10:15:11 am

Was notified new cooling unit would be delivered yesterday by end of day. At 2:08 was notified of a emergency reschedule. Today was notified cooling unit is now back in Grand junction Colorado. Kinda must of missed a turn. Only a 500 mile mistake. Hopefully will get this week.
Scott

Re: Dometic RM 1282 cooling issues

Reply #53 – July 20, 2021, 12:06:35 pm

Quote from: dsd – July 20, 2021, 10:15:11 am

Was notified new cooling unit would be delivered yesterday by end of day. At 2:08 was notified of a emergency reschedule. Today was notified cooling unit is now back in Grand junction Colorado. Kinda must of missed a turn. Only a 500 mile mistake. Hopefully will get this week.
Scott

Mine came to post Falls from Montana, then went back to Montana, then to Spokane. It's a mess.
Chris

Re: Dometic RM 1282 cooling issues

Reply #54 – July 21, 2021, 10:56:24 pm

So received Amish cooling unit. I ran both cooling units side by side and the Amish is about 15 degrees cooler hanging on a similar rope. Both leveled. Great idea to run both and was nice to be able to compare apples to apples. Not my idea. Quite interesting that they start up and don't do anything till they actually basically seem to start all at once. Quite interesting to me anyway. So when I removed the heating elements on the old unit they both were corroded (red iron dust not yellow) would it be acceptable to use heat conductive grease IE; Dow 340? Quote ; DOW 340 resists changes in consistency at temperatures up to approximately 350ÂºF (177ÂºC) and has a maximum operating temperature of 392ÂºF (200ÂºC).
Scott

Dow Corning 1446622 Silicone Heat Sink Compound Lubricant Grease, 5 oz, 140...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Dometic RM 1282 cooling issues

Reply #55 – July 22, 2021, 06:51:51 am

Scott, what's the purpose of the dielectric grease? Recounting old heat coil?

Glad new unit is colder.

Re: Dometic RM 1282 cooling issues

Reply #56 – July 22, 2021, 07:39:12 am

Correction, silicone heat transfer paste. If its the white looking heavy, hard to smear grease, we use it all the time here at work on extruders (500+) heating sections to ensure proper heat transfer. Not sure about the brand though. Ive used it for anything that requires good heat sinking or heat transfer for over 40 years. A little goes a looooong way.

Re: Dometic RM 1282 cooling issues

Reply #57 – July 22, 2021, 09:15:57 am

Zinc oxide and Polydimethylsiloxane. Yes it's a white paste. Should eliminate corrosion and improve electric heater conduction. And yes a little goes a long way.
Scott

Re: Dometic RM 1282 cooling issues

Reply #58 – July 22, 2021, 10:44:49 am

Yep, zink oxide was the word I was searching for....great for heat transfer, never seen it degrade or get hard well into the 5-600f range.

Re: Dometic RM 1282 cooling issues

Reply #59 – July 23, 2021, 02:45:34 pm

So after all the additional insulation and seals reinstalled. Fridge with new cooling unit installed. Pretty tight going in four days off (Jiim) came down with lift and I used my jack to side into place past new seals. Probably not a approved installation procedure but since there is no book I don't know any better. It's in place, Ali lack is finishing.
Scott

Re: Dometic RM 1282 cooling issues

Reply #60 – July 25, 2021, 12:01:16 am

All I lack is finishing. That was a understatement. Just finished 1/2 hour ago. The great cooler beat down. So after I had it in last night and before I started reinstalling everything just for some self gratification I turned it on to see it cool. Well it overtemped and shut down. I reset power and it started up and ran perfect. Cooling fans turned on after about five minutes and freezer coil temperature dropped to -20. All good. Boiler 167c. I shut it down and finished with all the removed panels inside. Fired it up again and went to overtemp at 220C every time I tried. I was never able to get it to restart again I fooled with till fairly late last night and finally walked away beaten. Badly. Today was a new day of getting whooped. I have double check level on everything. I took coach out into the driveway and and pitched it to the left then to the right, nose up tail up. No joy will not restart. What the heck? Sent out some requests for help and bounced ideas of several people. Decided to disconnect ARP fridge Defend and hot wired controller and pulled insulation back to expose boiler tube. Got my pyrometer out and fired it up. Temperature was similar for both ARP and pyrometer so at 220C there was nothing happening and upper boiler tube hadn't raised 2 degrees. The temperature held at 220 then all of a sudden the upper tube temperature climbed 50+ degrees and the bubble pump was finally moving fluid. Almost immediately boiler temp dropped to 212C and continued to cool down to were it's at right now, 167C. Fans came on after five minutes and I noticed that they were cycling. I did reconnect ARP controller, it is doing its job and will run overnight. I'm hoping what ever was causing the resistance to start will be resolved after it runs a few hours. The freezer was freezing and the fridge was cooling. Jim and Chris thanks for the needed help. It almost won that battle.
Scott

Re: Dometic RM 1282 cooling issues

Reply #61 – July 25, 2021, 12:44:18 am

Persistence. Glad it's going.Glad I could be some help, but I think your the man.
Cheers
Chris

Re: Dometic RM 1282 cooling issues

Reply #62 – July 25, 2021, 09:08:45 am

Scott are you running the ARP that you ran on your original dometic unit? The older ARP units will NOT work with JC refrigeration's units. AS told by ARP, the Amish units have a high temperature spike when they start up. Like to drove me nuts before I figured it out. Call ARP he will give the details, it's also in their instructions if you can find it. I don't remember what the version has to be to work.

Re: Dometic RM 1282 cooling issues

Reply #63 – July 25, 2021, 10:21:22 am

Quote from: bbeane – July 25, 2021, 09:08:45 am

Scott are you running the ARP that you ran on your original dometic unit? The older ARP units will NOT work with JC refrigeration's units. AS told by ARP, the Amish units have a high temperature spike when they start up. Like to drive me nuts before I figured it out. Call ARP he will give the details, it's also in their instructions if you can find it.

Well I regret not posting earlier. That explains exactly my problem exactly. I just couldn't understand why something so simple as a coffee pot wouldn't percolate. I'll reach out to Paul at ARP. Hopefully there is a work around to address the spike. I really like the idea of managing the fridge from overheat due to out of level. This morning Boiler temperature was 166c. Temps this morning were 0F and 30F and while I was walking out heard the ice maker drop the second group of ice with the Freon chiller off/disconnected from the ice maker (with a additional switch) it getting threw one start cycle really confused me to why it wouldn't participate after. Jim asked me last night if we ever feel like we are creating our own problems. Lol.

Scott

Re: Dometic RM 1282 cooling issues

Reply #64 – July 25, 2021, 10:45:53 am

If you have an older ARP unit you will need to upgrade it to a newer unit.

Re: Dometic RM 1282 cooling issues

Reply #65 – July 25, 2021, 11:00:10 am

Quote from: bbeane – July 25, 2021, 10:45:53 am

If you have an older ARP unit you will need to upgrade it to a newer unit.

Yup, reach out to Paul with ARP.

Re: Dometic RM 1282 cooling issues

Reply #66 – July 28, 2021, 12:34:41 pm

Prior to this had noticed a 5 degree split between theft ant right cooling fins inside of fridge. Left being colder. Removed right and verified good layer of conductive paste. Added a complete layer to tubes and mount and reinstalled. Now have a one degree split between the two?
So 24 hour average and have been opening and closing fridge using ice also. Real happy with it so far. Thermistor set to warmest temperature and timer set to three
Scott

Re: Dometic RM 1282 cooling issues

Reply #67 – July 28, 2021, 01:18:04 pm

Not to hijack but have 1 question. PO installed a new Dometic in my coach 10 years ago and I have no idea if arp was changed. I installed a JC Refrigeration unit last year and I didn't change arp but the unit works as it should. Should I have any concern over existing arp?

Re: Dometic RM 1282 cooling issues

Reply #68 – July 28, 2021, 01:31:39 pm

Dub,

Call Paul at ARP.

Re: Dometic RM 1282 cooling issues

Reply #69 – July 28, 2021, 02:00:34 pm

Quote from: Dub – July 28, 2021, 01:18:04 pm

Not to hijack but have 1 question. PO installed a new Dometic in my coach 10 years ago and I have no idea if arp was changed. I installed a JC Refrigeration unit last year and I didn't change arp but the unit works as it should. Should I have any concern over existing arp?

Jim fourdaysoff installed Amish unit and never had to adjust his. Same unit as mine. Paul would know but from what I know if it's not going into overheat I personally wouldn't worry about it.. mine trips at 220C and starts at 225C

Re: Dometic RM 1282 cooling issues

Reply #70 – July 28, 2021, 02:04:38 pm

10/4 will call Paul. Want no issues.

Re: Dometic RM 1282 cooling issues

Reply #71 – June 27, 2024, 12:54:56 pm

Hey just a follow up on my cooling unit. Coach was heat soaked yesterday at 97 degrees. Pretrip I started the fridge and turned on its icemaker. Within a hour it dumped its first tray of ice cubes. Fridge was at 70 deg. Today I dump a full container of cubes. Coach was set to 86 degrees and dropped it down to 82 for today. Fridge is empty but running at 33 and 0. With outside temps reaching like 109 today. It is in the shade but working great IMO. Glad I replaced the cooling unit.

Re: Dometic RM 1282 cooling issues

Reply #72 – June 27, 2024, 01:16:56 pm

You might consider putting one gallon of water in the freezer and two gallons in the fridge so there is something to absorb the cold air besides just air

Re: Dometic RM 1282 cooling issues

Reply #73 – June 27, 2024, 01:39:44 pm

Or better yes, those gallon jugs frozen from home freezer.

Re: Dometic RM 1282 cooling issues

Reply #74 – June 27, 2024, 03:37:09 pm

Oh it will be filled before we leave. Everything acts as a flywheel. Just nice to see the numbers about were they should be. I had separated power for the ice maker and the Freon chiller for the freezer. Allows the ice maker to work separately so if the freezer is cold enough it will make ice. Just not as fast.

Affiliate Notice