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06-08-2005, 03:28 PM
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#1
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Rivet Master
1994 30' Excella
Currently Looking...
Milwaukee
, Wisconsin
Join Date: May 2004
Posts: 1,935
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Fridge While Driving
Just when I thought I had everything figured out, I opened my owner's manual and started reading. Right there on page 26 it says to to use the 12V setting on the Fridge while driving. Does anyone do this? Would it really keep the Miller Lite cold? What are the draw backs?
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Chaplain Kent
Forest River Forester 2501TS
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06-08-2005, 03:39 PM
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#2
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Rivet Master
2012 25' FB Eddie Bauer
Vintage Kin Owner
Virginia Beach
, Virginia
Join Date: Sep 2004
Posts: 7,801
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Wanna Three Way?
Now That's a question I never thought I'd ask a chaplain!
Congratulations, you have a three way refrigerator. My new trailer only has a two way, 120 v and propane. I'm opposed to running with my propane tanks open because of the risks of fire and explosion. On a moho where the 12 volt can run directly off the engine's alternator and battery, why not do it? ENJOY.
Isn't it fun when you discover an added benefit on something you've already paid for? Keep reading those manuals, who knows what else you'll find.
Some of the older trailers also have three way refrigerators, but they cost a bit more than the 2 ways and with more and more full hookups so they are only offered as an upgrade now.
Tin Lizzie
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06-08-2005, 03:40 PM
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#3
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Contributing Member
2018 Interstate Grand Tour Ext
Austin (Hays County)
, Texas
Join Date: Jun 2002
Posts: 7,164
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Quote:
Originally Posted by Chaplain Kent
Just when I thought I had everything figured out, I opened my owner's manual and started reading. Right there on page 26 it says to to use the 12V setting on the Fridge while driving. Does anyone do this? Would it really keep the Miller Lite cold? What are the draw backs?
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I had a 3-way refrigerator in my Scamp. It would hold the temperature of the contentss while driving, but I had to remember to turn it off when stopping for more than a few minutes to prevent draining the battery.
I don't miss the DC mode and wouldn't spend anything more to get a 3-way.
__________________
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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06-08-2005, 03:44 PM
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#4
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Rivet Master
1978 31' Sovereign
Texas Airstream Harbor
, Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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Quote:
Originally Posted by Chaplain Kent
..... What are the draw backs?
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CK;
Remember, there are TWO 12 volt system hookups to a "modern" (memory board type) 3 way ammonia refrigerator.
The first, a very low, but constant, draw actually controls the unit - 12 volt/gas/110/thermostat control.
The second 12 volt system is the heating unit for the boiler - a very heavy amperage draw designed to be used only when the engine is running.
I would recommend an actual run analysis of your entire system under the worst case conditions (night, AC on, normal charge to the batteries) and then determine if your alternator is stout enough to handle the entire load. AirStream went to a 105 amp alternator for the MoHos in the mid 80's.
You may well have an alternator of insufficient size to handle the load of fridge heating element.
As an alternative, a 20 pound bag of ice (usually a couple of bucks) split between the freezer section and the cooler section of the refrigerator lasts a long time and will keep things cold for longer than I care to drive.
As stated earlier, the 12 volt boiler element does not work as well as either the gas or the 110 heat sources - at least that is the way it works on my almost 20 year old unit.
I also consider running any gas fired burner while underway an unnecessary risk....I have found that I really do not need to run any propane device while underway.
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Dennis
"Suck it up, spend the bucks, do it right the first time."
WBCCI # 1113
AirForums #1737
Trailer '78 31' Sovereign
Living Large at an Airstream Park on the Largest Lake Totally Contained in Texas
Texas Airstream Harbor, Inc.
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06-08-2005, 03:44 PM
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#5
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Aluminut
2004 25' Safari
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, Illinois
Join Date: Feb 2003
Posts: 10,477
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I contacted Dometic a few months ago when this subject came up. I asked them if it was safe to run the fridge on LP when in transit.
Their answer was that it was perfectly safe, but that some states have laws against doing it.
That said, when in transit, we've always had the fridge on and on LP. One nice feature of the new models is that they are all electronic. They shut down the flame automatically when the fridge gets to temp, so you don't actually have the flame on 24x7 like in the older days.
Feel free to go to the Dometic website and shoot their tech folks the same question. I got a response back in about 30 minutes.
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06-08-2005, 09:49 PM
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#6
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Rivet Master
2004 30' Classic
Johnson City
, Texas
Join Date: Jun 2003
Posts: 591
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We run ours on LP while traveling.
We had to put a filter in the frig outside vent to keep it from blowing out when moving. Will be putting in the metal deflector panel shortly.
73/gus
__________________
Gus - KR4K : Mary - K5MCL
2004 30ft. Classic
2017 Infiniti QX80 Limited
ProPride 3P/Prodigy P3
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06-10-2005, 01:11 PM
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#7
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Rivet Master
1966 26' Overlander
Woodstock
, Georgia
Join Date: Feb 2002
Posts: 8,525
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we chill ours down really well ovrnight or longer before leaving on a trip. For most of the ride I leave the fridge off and it stays cold. I will crank the gen and turn it on only if needed, but I don't run it on LP while driving. Seems a little scary to me.
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06-12-2005, 08:43 PM
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#8
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4 Rivet Member
1982 31' Airstream 310
Longview
, Washington
Join Date: Sep 2002
Posts: 269
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I have run My fridge on LP going down the road for over 3 years and I have not had bad luck with it as of today. Not going to saying it's not going act up some time and bad thing happening to it.
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06-12-2005, 09:10 PM
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#9
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Moderator Emeritus
1964 26' Overlander
1978 Argosy Minuet 6.0 Metre
Anna
, Illinois
Join Date: Sep 2002
Posts: 5,705
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Fridge While Driving
Greetings Chaplain Kent!
Quote:
Originally Posted by Chaplain Kent
Just when I thought I had everything figured out, I opened my owner's manual and started reading. Right there on page 26 it says to to use the 12V setting on the Fridge while driving. Does anyone do this? Would it really keep the Miller Lite cold? What are the draw backs?
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The 3-Way Dometic RV Refrigerators are indeed FANTASTIC!! I wish that my Argosy had one as original equipment (my 1980 Nomad had one as original equipment and it was my first new coach). When I needed a new RV refrigerator for my Overlander, I insisted upon a Dometic 3-Way RV Refrigerator and have been absolutely thrilled with it as I was with my first 3-Way Dometic in 1980! So long as the refrigerator is first cooled using either LP or 120-Volt AC, the 12-volt setting maintains the temperature with absolutely no problems in my experience with two different boxes over the past 25 years -- in fact, the refrigerator in my Overlander has been operated less then five hours on LP gas in the more than six years since it was installed (the Overlander has Solar Panels so there is little danger of running out of 12-volt power on most trips). Even with the Nomad and just one house battery, I never experienced any problems with battery depletion so long as I switched to LP after setting up camp if I didn't have full utilities available. It is so nice to never have to worry about whether my pilots are extinguished prior to entering a gas station as I always travel with my LP valves closed.
Once you become accustomed to your 3-Way Dometic RV Refrigerator, I am sure that you will be a fan as well.
Kevin
__________________
Kevin D. Allen
WBCCI (Lifetime Member)/VAC #7864
AIR #827
1964 Overlander International
1978 Argosy Minuet 6.0 Metre
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06-12-2005, 09:34 PM
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#10
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RivetAddict
1986 34.5' Airstream 345
Louisville
, Kentucky
Join Date: Feb 2003
Posts: 1,861
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The 3 ways also have a cutoff that turns off the 12V and switches to go to LP if the battery voltage drops too much. Basically, it tries 110, then 12V then LP as a last resort. 12V to the board is required at all times to operate the fridge at all.
They are also wired into the ignition so if its running on LP and you turn off the coach it will swith back to 12V. It "assumes" that you could be stopping to fill up...so kinda nice of it to turn off the propane. I think it waits 20 minutes until it tries LP again.
We drive with it on. Since we're underway I'm betting it stays on 12V until we park for a while. Never had any problems.
__________________
Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
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06-14-2005, 07:14 PM
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#11
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Rivet Master
1994 30' Excella
Currently Looking...
Milwaukee
, Wisconsin
Join Date: May 2004
Posts: 1,935
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I cooled down the fridge with the propane and then switched over to 12V for today. I had Chummy out all day running errands and getting set for our trip this week and the ice never thawed. I noticed no difference in the charging or battery drain. Thanks for the help. I am going to use this feature often.
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Chaplain Kent
Forest River Forester 2501TS
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06-14-2005, 09:08 PM
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#12
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4 Rivet Member
1982 31' Airstream 310
Longview
, Washington
Join Date: Sep 2002
Posts: 269
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My fredge still working great for 23 Years. I'm going to try and keep it running as long as I can.
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06-14-2005, 09:15 PM
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#13
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Rivet Master
, Minnesota
Join Date: Aug 2003
Posts: 7,721
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Quote:
Originally Posted by alfalsetto
My fredge still working great for 23 Years. I'm going to try and keep it running as long as I can.
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I'll see your 23 and raise you 23. My 1959 Frigidaire still runs great. It's only a one way, tho.
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06-15-2005, 07:03 AM
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#14
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Aluminut
2004 25' Safari
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, Illinois
Join Date: Feb 2003
Posts: 10,477
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Quote:
Originally Posted by alfalsetto
My fredge still working great for 23 Years. I'm going to try and keep it running as long as I can.
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My family has a 1982 SOB. Just the year before last, the Dometic in it sprung an Ammonia leak. It worked flawlessly for 21 years. They had it fixed and it's as good as new....hope to get another 21 years out of it.
I hope the Dometic gear in our Airstream can last that long!
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08-21-2005, 09:46 PM
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#15
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4 Rivet Member
1982 31' Airstream 310
Longview
, Washington
Join Date: Sep 2002
Posts: 269
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"markdoane" You win! My Refrigerators went out last week. I'm looking for a good 3-way to replace it with. I'm going to use Ice to keep it cool this next week trip.
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08-21-2005, 10:55 PM
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#16
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Contributing Member
2018 Interstate Grand Tour Ext
Austin (Hays County)
, Texas
Join Date: Jun 2002
Posts: 7,164
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Using ice
Quote:
Originally Posted by alfalsetto
"markdoane" You win! My Refrigerators went out last week. I'm looking for a good 3-way to replace it with. I'm going to use Ice to keep it cool this next week trip.
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You might ought to rethink that idea. Refrigerators aren't as well insulated as good ice chests and ice doesn't work very well.
We tried using ice when our refrigerator went out on our last trip. I was buying blocks of ice daily when I could get the blocks and bags of cubes otherwise. It was a disaster with water going everywhere. The bags on the ice leaked and when I tried to put the bags in a throwaway aluminum pan, iwater sloshed out when the trailer moved. Also, the bags sweated terribly and dripped all over the place.
We finally found a grocery store that stocked dry ice. About $6 worth of dry ice in the freezer compartment kept the compartment cool for days on end without any mess. Wrap the dry ice in newspaper to regulate the cooling. A bare block of dry ice will freeze everything in there solid.
Our local HEB grocery has dry ice. I often buy a small block to start the cool-down of the refrigerator in near 100-degree weather. I figure that it saves on propane some of what the dry ice costs and cools down a lot faster. I put part of the block in the freezer compartment and part in the refrigerator section..
__________________
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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08-22-2005, 04:36 AM
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#17
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Moderator Emeritus
1972 31' Sovereign
High Springs
, Florida
Join Date: May 2002
Posts: 2,311
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Ice works best in ice chests. Keep it in the chest, then transfer over to the fridge when destinated.
__________________
ARS WA8ZYT
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce!
Air # 283
WBCCI 1350
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08-22-2005, 07:52 AM
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#18
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Contributing Member
2018 Interstate Grand Tour Ext
Austin (Hays County)
, Texas
Join Date: Jun 2002
Posts: 7,164
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Folks who think that food stays safely cold in their turned-off refrigerator in hot weather should put a bag of ice in there and see just how fast it melts.
My refrigerator thermometer is out of the green (safe) sone within a couple of hours of turning the box off. My former 3-way would just barely hold safe temperature when ambient is near 100-degrees.
I nearly died once from food poisoning; spoiled food is a lot more dangerous than driving with the refrigerator on.
__________________
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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08-22-2005, 12:29 PM
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#19
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4 Rivet Member
1982 31' Airstream 310
Longview
, Washington
Join Date: Sep 2002
Posts: 269
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I think that I'll go "Dry Ice" this trip. then I'll order My new 3-way.
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