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08-14-2009, 11:44 AM
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#1
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banjobill
2000 30' Limited
battle ground,
, Washington
Join Date: Jun 2009
Posts: 516
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pros/cons of refer continuous operation
It is quite easy for us to leave the reefer operating-at home, on the road, boondocking and in a park-any chime in on operating the reefer full time. Well, shoot writing this I realized there are folks who full-time the trailer, so I assume they full-time the reefer, too! (duh!  ) But, I'd still like to hear comments on this...thanks.
ol' bill the newbie
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08-14-2009, 11:55 AM
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#2
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Moderator

2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach
, Florida
Join Date: Jul 2006
Posts: 12,171
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Greetings from the Florida Panhandle
We use camp in Lucy quite a bit, 120+ nights a year. We run the refer at all times when Lucy is in use. When we get her home, we usually shut the refer down for a defrost and cleaning. After as long as nine weeks of consistent use, there is some frost build-up in the freezer section.
Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2020 Silverado 2500 (Vivian)
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08-14-2009, 12:18 PM
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#3
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Tom, the Uber Disney Fan
2006 30' Safari
Orlando
, Florida
Join Date: Aug 2004
Posts: 4,693
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My wife uses our Airstream "reefer" as an overflow from our "reefer" in the kitchen. After three + years of near continuous use, we haven't had a problem. It isn't opened often between trips, just when we need to get something out or to stock it for a trip.
__________________
2006 30' Safari - "Changes in Latitudes"
2008 F-250 Lariat Power Stroke Diesel Crew Cab SWB
Family of Disney Fanatics
WBCCI# 4821
https://streaminacrossamerica.com/
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08-14-2009, 12:29 PM
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#4
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Moderator

2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 9,653
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Like anything else it will be a wear and tear issue. Logic would say that something going 24x365 is going to wear out faster. Harmful no. Sometimes depending on the item, not using it causes more harm! A low mileage class A or class C unit might be less reliable due to the wear and tear caused by sitting. We know that tires need to roll and axles need to flex. Non use kills them.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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08-14-2009, 02:50 PM
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#5
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Rivet Master 
2005 19' Safari
1968 24' Tradewind
Rural
, Delaware
Join Date: Jun 2005
Posts: 1,476
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Right or wrong, aside from an occasional defrosting, ours has been running continuously for over 4 years. No problems yet.
__________________
2005 Bambi
1968 Trade Wind
2007 Ford F250 4x4 Crew
WDCU
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08-14-2009, 04:17 PM
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#6
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Rivet Master 
2007 23' Safari SE
Central
, Connecticut
Join Date: Jul 2008
Posts: 1,652
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Another newbie question - how much propane does a frig typically use? Can they run a very long time on the two 20-lb bottles?
Tom
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08-14-2009, 07:07 PM
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#7
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3 Rivet Member 
2005 25' Safari
2016 30' Classic
Columbus
, Ohio
Join Date: Jul 2008
Posts: 123
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Ran mine continuously for almost 2 weeks using what seemed less than half a 30 lb.us tank.
__________________
2016 Classic
2016 Ford F-250 Lariat 6.7PSD
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08-14-2009, 07:14 PM
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#8
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CLOUDSPLITTER "Tahawus"

2003 25' Classic
Zanadude Nebula
, Milky Way
Join Date: Jun 2007
Posts: 16,588
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 15 days in the Adirondack's, on lpg most of the time, stays on while traveling. Did work well.
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"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag.”
― Molly Ivins
Tahawus
🌤
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08-14-2009, 08:47 PM
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#9
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4 Rivet Member 
Join Date: Aug 2002
Posts: 358
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New Cooling Unit __ Poor reg Frig temps 39-40 deg
As Jack pointed out. Non use has disadvantages.
Just found that out yesterday coming back from Myrtle Bch, and had the curb tire loose the tread after some rough roads. Tires were 7 years old and I was hoping for few more months of use. Bought a tire (luckily a small town had one) and was a wake up call for the 6 year life.
On that note I do believe that I could get more life had I just used it more frequently during the last 3 years. Note that my car tires got constant use and no problems with 8 years and 80,000 miles.
***On the Dometic 2603, I replaced the back cooling unit following the instructions exactly 2 years ago. Freezer gets to 16 deg. but frig only gets to 39-40 lowest either on gas or electric.
I too was wondering if the extra costs of running it (electric) would prevent the clogging of the ammonia gas in the coils, which I believe is what is happening.
Keep the posts coming.....
Steve
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08-14-2009, 09:11 PM
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#10
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Rivet Master 
1977 Argosy Minuet 6.0 Metre
1973 21' Globetrotter
1975 26' Argosy 26
Vista
, California
Join Date: Sep 2006
Posts: 581
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I never thought about turning it off. My frige is only two years old, it must be frost free. Not any moving parts,whats to wear?
Bibbs
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08-14-2009, 10:13 PM
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#11
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Moderator

2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 9,653
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Quote:
Originally Posted by bibbs
I never thought about turning it off. My frige is only two years old, it must be frost free. Not any moving parts,whats to wear?
Bibbs
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The electric heater element has a fixed life. It's nothing more than a metal coil. Electronics in the "brains" constantly running. If you are constantly under gas operation, the gas valve will eventually die, the thermocouple that senses the flame will die. I don't know the effect of the boiler being continually under pressure, so that's pretty much an unknown. So for all intents it doesn't have to move, or move much to have a fixed life. What none of us know is the what the toll of constant operation is.
My fridge in my Hi-Lo failed after 14 years of use. If you added up all the hours that it ran over the course of 14 years, it probably doesn't even come close to my much more mechanical refrigerator in my house. Consider the climate the trailer fridge has to run in plus the shaking it gets during towing, I would be surprised that a home unit wouldn't have a shortened life.
So in retrospect maybe the biggest item that affects the life of an RV refrigerator is how much it gets towed and the roads you travel on. The wear and tear caused by operation might be a minor to what is inflicted when you are on the road.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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08-14-2009, 10:16 PM
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#12
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4 Rivet Member 
Join Date: Aug 2002
Posts: 358
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Ammonia only moving "part" _ does clog though
And that is the reason for asking if others had negative results from just running the frig a few times a year to camp vs. running all the time and it's expense on electricity.
Remember that is a heating coil to boil the ammonia in the back and resistance heat is not cheap - nor is replacement of a frig. I guess it would use more electricity than a full size frig because it is using a small compressor and fans.
Steve
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08-14-2009, 10:26 PM
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#13
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Moderator

2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 9,653
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Quote:
Originally Posted by Sav'h Steve
And that is the reason for asking if others had negative results from just running the frig a few times a year to camp vs. running all the time and it's expense on electricity.
Remember that is a heating coil to boil the ammonia in the back and resistance heat is not cheap - nor is replacement of a frig. I guess it would use more electricity than a full size frig because it is using a small compressor and fans.
Steve
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The other thing directly related to this comment is whether you operate that fridge in an off level situation. On the older units running off level didn't allow for free flow of the ammonia liquid mix. Once that free flow gets inhibited you start to develop deposits which eventually starts a clog. Somewhat like plaque in an artery. Once it starts it slowly continues to build until you get a clog....and your fridge has a heart attack, which for all intents means a loss of cooling capacity.
The newer fridges have been engineered to be more tolerant of off level conditions. Supposedly if its comfortable for you, then you are level enough. I'm picky and I try really hard to get that bubble centered. RV refrigerators are expensive to replace.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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08-14-2009, 11:39 PM
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#14
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Rivet Master 
1978 24' Argosy 24
Woodinville
, Washington
Join Date: May 2006
Posts: 682
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I think in general more things die on trailers from lack of use (maintenance) than over use. But, electric coils do have a wear out factor and certainly running on propane there will be issues with soot build-up. If stationary though I think the electric coils shouldn't be an issue. I can't see feeding the thing propane year round though if the fridge is staying home more often than not.
We have a mid '40s fridge in our house that's been running almost continuously for over 60 years. There's no way it would still be alive if it was left sitting and then plugged in occasionally. OTOH, it's lasted this long because in hasn't been moved in almost 50 years!
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08-15-2009, 12:57 AM
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#15
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Rivet Master 

2005 25' Safari
Salem
, Oregon
Join Date: Mar 2006
Posts: 8,059
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Another point of view.
 Hi, I don't think leaving the refrigerator on all of the time is much of an issue, but the fact that you will be plugged in, most or all of the time is. Your converter, in many cases, will cook your batteries in time and removing your batteries while plugged in will most likely kill your converter. Therefore I only use mine while traveling, ....... "Travel Trailer".
__________________
2005 Safari 25-B "Le Petit Chateau Argent" [ Small Silver Castle ] 2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3 YAMAHA 2400 / AIR #12144
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08-15-2009, 08:20 AM
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#16
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4 Rivet Member 
Join Date: Aug 2002
Posts: 358
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Jack,
You are right about the leveling. I have a '90 Excella with a new cold pack installed in '07 on the existing frig box.
I do get it pretty level. Easier to do front to back, I'll tolerate a little off center side to side level, so I think I'm OK within the frig tolerances.
My post was more to ask if anyone found that more continuous running helped clear up an *apparent* ammonia clog. In other words, a lightly clumped gas started running more free.
I have heard of people who have a *dead* frig pull it out and turn it upside down several times. Andy says that is *at best* a short time fix and ready for a new one.
Since I just put on a new cooling unit, I don't think I'm at the *dead frig* point. Least hope not. Wife wants to get a small electric for the back of the pickup when we are in full service RV sites.
Steve
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08-15-2009, 09:29 AM
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#17
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Moderator

2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 9,653
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I think the ammonia clog is normally a sign of off level operation. Once you operate off level the ammonia mixture separates due to the lack of free flow within the boiler and evaporative piping. The inability for the liquids to remix from being off level along with the heat applied starts the development of the blockage.
I don't believe continuous running is beneficial to clearing clogs. The best prevention is to run them level. Mine ran 14 years in my old trailer before failing due to a leak. Clog was never an issue.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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08-15-2009, 03:08 PM
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#18
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4 Rivet Member 
Join Date: Aug 2002
Posts: 358
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Dometic Service Manual pdf says....
Jack,
You are right. Here is what the Dometic people say:
Very good manual, has a diagnostic flow chart also
"Under normal operation the temperature at
the absorber coils (A) and the boiler (B)
should be approximately the same. If the
temperature at the absorber coils (A) is
much hotter it indicates loss of refrigerant
and the cooling unit must be replaced. If
the temperature at the boiler (B) is very hot
and the absorber coils (A) are cool it indicates
that the refrigerant is not circulating properly."
(The absorber coils are the ones that zig-zag down the back)
I haven't checked this or the top vent yet. Pouring rain in Sav'h today.
Steve
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08-15-2009, 06:11 PM
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#19
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Rivet Master 

2006 19' Safari SE
Tucson
, Arizona
Join Date: Jun 2007
Posts: 4,620
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We leave our frig on all the time (on shore power) unless we are not going to be able to get out camping for a month or longer...in that case we do shut it down and give it a good cleaning...and leave the door open so that it dries completely inside so that mildew/mold does not have a chance to grow. While running at home, we do check it periodically to make sure it is operating properly...we have not had a problem so far. We did the same thing with a small motor home...also a Dometic frig and we never had a problem.
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TB & Greg and Abbey Schnauzer
AirForums #21900 . Membership Chair & PastPrez, 4CU/WBCCI #3954
Travel Log: AZBambi...On the Road Again
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08-15-2009, 09:49 PM
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#20
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Rivet Master 
1993 21' Sovereign
Colfax
, North Carolina
Join Date: Jun 2003
Posts: 21,254
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The correct answer is...
Both.
I have noticed it takes about the same time for a cooling unit to "wear out" from constant use as it does to fail from intermittent use. From customers with failed fridges of about the same age, it seems to be around a 50/50 split.
__________________
Terry
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