Fridge not working - Page 2 - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-26-2015, 11:23 AM   #15
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,315
Registry
Quote:
Originally Posted by Carol H View Post
I agree. I have a small battery operated fan in my fridge that does not generate any heat and it does help in keeping the air moving in the fridge. I have notice the fridge runs slightly warmer when the fan is not running.
Well.... Truth be told, it does generate some heat. All electrical devices do, (except superconductors). Just an unmeasurable amount of heat. But I am splitting hairs.
__________________

__________________
David Tilston is offline   Reply With Quote
Old 05-26-2015, 11:36 AM   #16
Senior Member
 
Name: Greg
Trailer: 2008 Casita 17 SD
Washington
Posts: 1,047
Registry
How old is your fridge? How long since you last ran it? Have you checked to see that your refrigerant hasn't gone bye bye? Another common problem with these RV fridges is a lack of use, yes...a lack of use, which can cause all the crap in your coolant lines to settle out and cake up inside the low points of the cooling tubes. Some people have removed their fridges and turned them upside down and ran them that way for a few days, and they may start cooling again. But, and this is a big but, the curative effects are generally short lived and you'll find the cooling tubes will once again crud up and block the coolant flow. Not saying that this is for sure what your problem is, but it is a very common problem with these little units. This is exactly why I never turn my fridge off even though there is nothing in it. It keeps all that crud in solution and moving. Not running them is the worst thing you can do to them. YMMV
__________________

__________________
Casita Greg is offline   Reply With Quote
Old 05-26-2015, 12:57 PM   #17
Senior Member
 
rbryan's Avatar
 
Name: Robert
Trailer: 2015 Escape 19 "Past Tents" 2015 F150 Lariat Ecoboost Crew Cab
Texas
Posts: 899
Registry
Quote:
Originally Posted by Casita Greg View Post
How old is your fridge? How long since you last ran it? Have you checked to see that your refrigerant hasn't gone bye bye?
The fact that the fridge cools when running on electrical power suggests that the absorption unit (these fridges don't have coolant or refrigerant) is working fine. Absorption requires a heat source to start the cycle. The problem here lies with using Propane as the heat source.
__________________
"You can't buy happiness, but you can buy an RV. And that is pretty close."
rbryan is online now   Reply With Quote
Old 05-26-2015, 08:40 PM   #18
Senior Member
 
Name: Greg
Trailer: 2008 Casita 17 SD
Washington
Posts: 1,047
Registry
Ah, but they do have a coolant in the tubing. Even though they are "passive systems," (i.e. no compressor, motor, etc,) they are still charged with ammonia.
__________________
Casita Greg is offline   Reply With Quote
Old 05-26-2015, 08:52 PM   #19
Senior Member
 
rbryan's Avatar
 
Name: Robert
Trailer: 2015 Escape 19 "Past Tents" 2015 F150 Lariat Ecoboost Crew Cab
Texas
Posts: 899
Registry
Quote:
Originally Posted by Casita Greg View Post
Ah, but they do have a coolant in the tubing. Even though they are "passive systems," (i.e. no compressor, motor, etc,) they are still charged with ammonia.
Yes, they contain a mixture of ammonia, hydrogen and water. Some manufacturers use other elements to increase the absorption process or to prevent corrosion. The mixture has a very low boiling point, in order to create the gas to start the cycle. None of these gases is a refrigerant or coolant (like Tetraflouroethane in a compressor based fridge) but they act as one because of their physical properties.

My original point was that the fridge is cooling when running on electricity. That is proof that the cooling unit's absorption cycle works. The problem occurs when the OP tries to run it on Propane.
__________________
"You can't buy happiness, but you can buy an RV. And that is pretty close."
rbryan is online now   Reply With Quote
Old 05-27-2015, 09:13 AM   #20
Senior Member
 
Name: Greg
Trailer: 2008 Casita 17 SD
Washington
Posts: 1,047
Registry
Robert, Thanks for the info, but I already know the components of the system and how it works, but just to clarify a point you made above, ammonia refrigeration systems are used all over the world and on a huge scale in almost every aspect of cooling and freezing throughout many industries. I'm not sure that I'm following where you're coming from when you say that it isn't a refrigerant or a coolant. It has been since about 1900. I'm not trying to be argumentative, just trying to understand what the difference is between a bonafide "refrigerant," like Freon for example, and another chemical that is being used for the same function. I may be wrong, but in my mind, if it is used as a refrigerant, then it is a refrigerant. (You know the one about if it walks like a duck, quacks like a duck, etc.)

After re-reading the OP, I see that it functions on electric, but not on propane. Sounds like he needs to have the burner serviced.
__________________
Casita Greg is offline   Reply With Quote
Old 05-27-2015, 09:52 AM   #21
Senior Member
 
Name: Joe
Trailer: 1999 Casita 17' SD
Ohio
Posts: 552
Greg.

The difference is easy to spot!

Refrigerant is made and patented by Dupont. Every time a patent runs out it's suddenly dangerous and requires a new refrigerant and patent. LOL

Reading here it seems ammonia and water was the first refrigerant.
Refrigeration - Wikipedia, the free encyclopedia

Joe
__________________
Joe Romas is offline   Reply With Quote
Old 05-27-2015, 09:58 AM   #22
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,315
Registry
Quote:
Originally Posted by Casita Greg View Post
Robert, Thanks for the info, but I already know the components of the system and how it works, but just to clarify a point you made above, ammonia refrigeration systems are used all over the world and on a huge scale in almost every aspect of cooling and freezing throughout many industries. I'm not sure that I'm following where you're coming from when you say that it isn't a refrigerant or a coolant. It has been since about 1900. I'm not trying to be argumentative, just trying to understand what the difference is between a bonafide "refrigerant," like Freon for example, and another chemical that is being used for the same function. I may be wrong, but in my mind, if it is used as a refrigerant, then it is a refrigerant. (You know the one about if it walks like a duck, quacks like a duck, etc.)

After re-reading the OP, I see that it functions on electric, but not on propane. Sounds like he needs to have the burner serviced.
Ammonia, propane, freon..... these are all used in compressor style refrigerators. They all depend on phase change to pump heat.

Our absorption style fridges do the same thing, but use partial pressures to make the ammonia think it has dropped in pressure and then evaporate, an endothermic process.

What I am curious about is where the crystals, referred to earlier, come from? Are they a chemical reaction with the ammonia and hydrogen, or steel, or water, or all four?
__________________
David Tilston is offline   Reply With Quote
Old 05-27-2015, 11:45 AM   #23
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Quote:
Originally Posted by David Tilston View Post

What I am curious about is where the crystals, referred to earlier, come from? Are they a chemical reaction with the ammonia and hydrogen, or steel, or water, or all four?
The properties of ammonia are such that it can crystalize if allowed to over heat. Which is what happens if the fridge is not level and unable to move the liquids and particles using only gravity as our fridges work. There may also be a chemical reaction with Hydrogen as well that will also cause some crystallizing.

As the cooling liquid solutions in our fridges depends on gravity to move the cooling liquids through it - if the fridge is run off level & as the crystals develop and accumulate in one spot they will cause the system to totally clog up and not work.
Carol H is offline   Reply With Quote
Old 05-27-2015, 12:39 PM   #24
Senior Member
 
rbryan's Avatar
 
Name: Robert
Trailer: 2015 Escape 19 "Past Tents" 2015 F150 Lariat Ecoboost Crew Cab
Texas
Posts: 899
Registry
Quote:
Originally Posted by Casita Greg View Post
Robert, Thanks for the info, but I already know the components of the system and how it works, but just to clarify a point you made above, ammonia refrigeration systems are used all over the world and on a huge scale in almost every aspect of cooling and freezing throughout many industries. I'm not sure that I'm following where you're coming from when you say that it isn't a refrigerant or a coolant. It has been since about 1900. I'm not trying to be argumentative, just trying to understand what the difference is between a bonafide "refrigerant," like Freon for example, and another chemical that is being used for the same function. I may be wrong, but in my mind, if it is used as a refrigerant, then it is a refrigerant. (You know the one about if it walks like a duck, quacks like a duck, etc.)

After re-reading the OP, I see that it functions on electric, but not on propane. Sounds like he needs to have the burner serviced.
We don't disagree Greg. If it acts as a coolant then it is one. I guess the difference is that a 'refrigerant' cools because of it's physical properties, rather than having some outside heat source change them. I also agree that the burner unit is the likely culprit.
__________________
"You can't buy happiness, but you can buy an RV. And that is pretty close."
rbryan is online now   Reply With Quote
Old 05-27-2015, 02:30 PM   #25
Senior Member
 
Name: None
Trailer: None
None
Posts: 2,730
I have worked on industrial cooling systems that used Freon ,ammonia and propane to cool product . None of these systems used heat to produce cooling,
all of the systems employed a compressor .Ammonia is often used in cooling systems to make the ice for indoor skating rinks and in large chemical and food processing plants where large amounts of refrigerant is required. If you have ever been around an ammonia compressor when it vents due to over pressure ,you would long remember the experience .
__________________
steve dunham is offline   Reply With Quote
Old 05-27-2015, 02:58 PM   #26
Senior Member
 
David Tilston's Avatar
 
Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
Alberta
Posts: 5,315
Registry
Yeah, heat to cool. That is kinda counter intuitive.

The heat is really just distilling the ammonia out of the water. The first big heat sink after the heater helps to condense any moisture out. It is sloped back toward the source to drain the water.

That Einstein guy was quite a genius:
A modified evaporative cooler for solar camping
__________________
David Tilston is offline   Reply With Quote
Old 05-27-2015, 03:03 PM   #27
Senior Member
 
mmeyer's Avatar
 
Name: Michael J
Trailer: U-Haul VT
Indiana
Posts: 471
Registry
Look up steam driven chillers, preferably with two effects , definitely use heat to cool. Granted there are heat exchangers and cooling towers involved.


Sent from my iPad using Fiberglass RV
__________________
mmeyer is online now   Reply With Quote
Old 05-27-2015, 08:42 PM   #28
Senior Member
 
rbryan's Avatar
 
Name: Robert
Trailer: 2015 Escape 19 "Past Tents" 2015 F150 Lariat Ecoboost Crew Cab
Texas
Posts: 899
Registry
Fridge not working

Quote:
Originally Posted by steve dunham View Post
I have worked on industrial cooling systems that used Freon ,ammonia and propane to cool product . None of these systems used heat to produce cooling, all of the systems employed a compressor .

I appreciate your experience, but RV absorption refrigerators don't use a compressor. There's a condenser, an evaporator, an absorber and a generator (the boiler). So, the heat provides the energy to start the cycle.


Name:   ImageUploadedByFiberglass RV1432777318.662212.jpg
Views: 22
Size:  108.4 KB


Sent from my iPhone using Fiberglass RV
__________________

__________________
"You can't buy happiness, but you can buy an RV. And that is pretty close."
rbryan is online now   Reply With Quote
Reply

Tags
fridge


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fridge not working; 12V replacement? Barrie Bochoff Problem Solving | Owners Helping Owners 37 06-04-2011 09:28 AM
3way fridge not working on 12V Rick G Problem Solving | Owners Helping Owners 28 03-31-2010 11:44 AM
Fridge not working on AC Parker Buckley Problem Solving | Owners Helping Owners 11 12-04-2009 09:53 PM
Fridge not working... Is it worth trying to fix it? Rob Carmody Problem Solving | Owners Helping Owners 6 09-06-2008 04:08 PM
Fridge not working all the time Karen Fisch Problem Solving | Owners Helping Owners 7 05-01-2006 08:25 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:04 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.