Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-08-2015, 10:48 AM   #15
3 Rivet Member
 
BearScream's Avatar
 
2007 20' Safari
Chelmsford , Massachusetts
Join Date: Oct 2014
Posts: 109
Quote:
Originally Posted by tjwoods1 View Post
Attach to the door like this?Attachment 244896
More efficient [nod to Lewster] and seems simpler than fabricating a bracket on the interior structure to hold the pair of fans. When a AS servicer claimed my fan was inoperative, I ordered twp Silenx replacements -- but removing and checking the old fan with a 12v supply showed the fan was OK. I suspected the thermostat was frozen open so the fan never works (the symptom) regardless of the switch.

For this newbie trying to fix a fan problem...

In your photo, there is a device mounted below and wired to the fans on the vent door. What is it?
Also the wiring does not seem to go to the thermostat. Are you bypassing it and operating manually?
Lewster, how would you check the thermostat operation?

Thanks.
__________________

__________________
"I could be bounded in a nutshell and count myself
a king of infinite space..." -Shakespeare (Hamlet)
BearScream is offline   Reply With Quote
Old 08-08-2015, 11:04 AM   #16
Rivet Master
 
Alphonse's Avatar

 
2010 28' Flying Cloud
Lower Alabama , USA
Join Date: Mar 2012
Posts: 646
Quote:
Originally Posted by tjwoods1 View Post
Attach to the door like this?Attachment 244896
Blowing out the vent helps avoid recirculation (thereby more efficient). Mounting the fans in free space, hoping the momentum of the air flow will carry it out, is less efficient. Mounting in free space will cause some recirculation of the flow and affects the flow across the fridge coils.

As Lew has pointed out before, put them where they are pulling air up through the cavity behind the fridge and blowing out a vent, on top or the side as your layout allows.
__________________

__________________
Alan
"If you must choose between two evils, pick the one you never tried before!"

Air #64439
Southeastern Camping Unit WBCCI #5033
TAC AL-8
2017 Canopenian
Alphonse is offline   Reply With Quote
Old 08-08-2015, 11:07 AM   #17
Rivet Master
Commercial Member
 
lewster's Avatar
 
Currently Looking...
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 6,994
Quote:
Originally Posted by BearScream View Post
More efficient [nod to Lewster] and seems simpler than fabricating a bracket on the interior structure to hold the pair of fans. When a AS servicer claimed my fan was inoperative, I ordered twp Silenx replacements -- but removing and checking the old fan with a 12v supply showed the fan was OK. I suspected the thermostat was frozen open so the fan never works (the symptom) regardless of the switch.

For this newbie trying to fix a fan problem...

In your photo, there is a device mounted below and wired to the fans on the vent door. What is it?
Also the wiring does not seem to go to the thermostat. Are you bypassing it and operating manually?
Lewster, how would you check the thermostat operation?

Thanks.
Most of the thermostats used for fridge fan circuits, regardless of the manufacturer, are essentially worthless. They seem to fail at exactly the point when most needed!!

I have found it far easier (and more reliable) to use a simple lighted SPST switch placed somewhere in the interior for easy access that controls fan operation.

My 19CCD had such a switch right at the entry door. On when needed....off when not. Works every time!
__________________
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
SOLAR TECH ENERGY SYSTEMS, INC.
AM SOLAR ...MAGNUM…VICTRON ENERGY...LITHIUM & LIFELINE BATTERIESMARINE REFRIGERATION
lewster is offline   Reply With Quote
Old 08-08-2015, 11:22 AM   #18
2 Rivet Member
 
2015 16' Sport
Eugene , Oregon
Join Date: Mar 2015
Posts: 75
The photo that accompanies my post "attached like this" is not mine. I found it and showed it to see if that was was setup Lewster was referring to. Therefore I can't comment on the schematics. Sorry.
__________________
tjwoods1 is offline   Reply With Quote
Old 08-08-2015, 01:25 PM   #19
New Member
 
Pearland , Texas
Join Date: Jun 2006
Posts: 3
I've had similar problems on my 1982 Avion 34V and found a thread on a forum on RV net. RV.Net Open Roads Forum: Propane vs Electric Use with NO Fans/Fans Test Results
It details temps during cool down using a fan to vent air in the top of the fridge on elect and on LPG with and without the fan. Based on this article I installed 2 fans below the top vent in my 1982 Avion 34V by removing the back of the compartment above my fridge, a Dometic RM 2080 that replaced a RM100 last year. Poor cooling has been an issue with the new fridge. Sometime temps in the 30s, mostly in the 40s. If traveling like TouringDan the temps will rise into the high 40s and low 50s. I filled the Dead space on one side of my fridge that was 2 inches with Corning rigid foam insulation called Foamular available from Home Depot. The other side was inaccessible without pulling the fridge but only a 1/2 inch dead space. The fridge cooled down adequately during the night. Temps now are 33 in the fridge part of the box and 14 in the freezer. The temps in the cavity above the fridge are in the mid to high 90s with the new fans running and 115 without the fan running. So the fans do vent the hot air. Temperature outside the trailer is 92 at noon, expected to be 100 by 4pm. Traveling with the fridge on LPG is always an issue. On a 5000 mile trip last month to the UP of Michigan the temp would always be in the mid to high 40s to the low 50s at the end of the day while driving. I will see next month, during a trip to Colorado from Texas, if the vents will help while traveling, hopefully they will.

I've made numerous contacts with Dometic Customer Service and they stated the following: "The refrigerator area should be a substance temperature of 38-43 degrees and the freezer 0-14. "
I also talked to an independent Dometic service person in Indiana during our trip, and he said dead space is problem. That is why I filled the dead space best I could with the rigid foam insulation stacked in the area space next to the fridge.

That is my 2 cents worth.
__________________
pmacelad12 is offline   Reply With Quote
Old 08-08-2015, 02:30 PM   #20
4 Rivet Member
 
greghoro's Avatar
 
2013 25' Flying Cloud
Wheaton , Illinois
Join Date: Aug 2014
Posts: 259
I have no roof chimney and went with a trio of computer cooling fans (Scythe Gentle Typhoon D1225C12B3AP-13 120mm Silent Case Fan) fastened to a bracket permanently attached to the inside of the top outlet door opening blowing outward. The fans sit about 1/2" from the cooling fins and the bracket has been trimmed to not impede air flow through the fans.

I suppose I could increase efficiency by filling in the space between the fans.




Greg
Attached Thumbnails
Click image for larger version

Name:	Refrigerator External Fans (Small).JPG
Views:	416
Size:	101.8 KB
ID:	244944  
__________________
greghoro is offline   Reply With Quote
Old 08-08-2015, 02:38 PM   #21
2 Rivet Member
 
hugheym's Avatar
 
1961 16' Bambi
1969 27' Overlander
Bonner Springs , Kansas
Join Date: Aug 2006
Posts: 31
Will this setup work for a fridge fan?

No question about it, this is a hot issue. I just installed a vent in the back door of my '61 Bambi and with that, mounted a computer fan in the existing vent above. I also have inhansed the insullation around the sides of the frig. This was done to create a in and out circulation bottom to top. Not quite done with this yet.

I installed a fan in our '69 some years ago. On this unit, I placed the fan at the base of the roof vent. Originally, I had located the fan about mid way on the coils; this resulted in a lot of hot air being forced into the galley area. The air came in around the oven.

Once I moved the fan very little hot air reached the inside the unit. This gave my AC some relief.

Martin
__________________
hugheym is offline   Reply With Quote
Old 08-08-2015, 03:17 PM   #22
4 Rivet Member
 
2006 19' Safari SE
Hayes , Virginia
Join Date: Dec 2011
Posts: 333
Leister is set up like mine; off when not needed and no noise at night. Works great thus far.
__________________
mocus is offline   Reply With Quote
Old 08-08-2015, 03:36 PM   #23
Rivet Master
 
AWCHIEF's Avatar
 
2006 23' Safari SE
Biloxi , Mississippi
Join Date: Nov 2011
Posts: 7,155
Images: 33
Today's temps are in the high 90's max humidity, heat index 108. I don't think any amount of fans would help. My fan has been running non stop for the past three days. Fridge does not want to go below 46 even with a new adjustable thermistor.
__________________
MICHAEL
AWCHIEF is offline   Reply With Quote
Old 08-08-2015, 04:50 PM   #24
Rivet Master

 
2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 2,351
We put some shade on our streets use fridge with our street side awning. It seems to help a bit.


Sent from my pocket Internet using Airstream Forums
__________________
KE4GNK/AE
'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it
rmkrum is offline   Reply With Quote
Old 08-08-2015, 05:29 PM   #25
Rivet Master
 
AWCHIEF's Avatar
 
2006 23' Safari SE
Biloxi , Mississippi
Join Date: Nov 2011
Posts: 7,155
Images: 33
No awning on that side. Would love to add them if someone wants to write the check. Maybe I can find a few suckers on "go fund me".
__________________
MICHAEL
AWCHIEF is offline   Reply With Quote
Old 08-08-2015, 07:44 PM   #26
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 6,609
Images: 1
Quote:
Originally Posted by AWCHIEF View Post
Today's temps are in the high 90's max humidity, heat index 108. I don't think any amount of fans would help. My fan has been running non stop for the past three days. Fridge does not want to go below 46 even with a new adjustable thermistor.

It's been like that here in Corpus Christi. So the reefer has been on propane as that is just slightly better at cooling than 120V (which itself has been difficult to maintain with the line I'm on).
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is offline   Reply With Quote
Old 08-10-2015, 12:12 AM   #27
Rivet Master
 
TouringDan's Avatar

 
1966 24' Tradewind
1995 34' Excella
Lynchburg , Virginia
Join Date: Sep 2009
Posts: 2,185
Quote:
Originally Posted by pmacelad12 View Post
I've had similar problems on my 1982 Avion 34V and found a thread on a forum on RV net. RV.Net Open Roads Forum: Propane vs Electric Use with NO Fans/Fans Test Results
It details temps during cool down using a fan to vent air in the top of the fridge on elect and on LPG with and without the fan. Based on this article I installed 2 fans below the top vent in my 1982 Avion 34V by removing the back of the compartment above my fridge, a Dometic RM 2080 that replaced a RM100 last year. Poor cooling has been an issue with the new fridge. Sometime temps in the 30s, mostly in the 40s. If traveling like TouringDan the temps will rise into the high 40s and low 50s. I filled the Dead space on one side of my fridge that was 2 inches with Corning rigid foam insulation called Foamular available from Home Depot. The other side was inaccessible without pulling the fridge but only a 1/2 inch dead space. The fridge cooled down adequately during the night. Temps now are 33 in the fridge part of the box and 14 in the freezer. The temps in the cavity above the fridge are in the mid to high 90s with the new fans running and 115 without the fan running. So the fans do vent the hot air. Temperature outside the trailer is 92 at noon, expected to be 100 by 4pm. Traveling with the fridge on LPG is always an issue. On a 5000 mile trip last month to the UP of Michigan the temp would always be in the mid to high 40s to the low 50s at the end of the day while driving. I will see next month, during a trip to Colorado from Texas, if the vents will help while traveling, hopefully they will.

I've made numerous contacts with Dometic Customer Service and they stated the following: "The refrigerator area should be a substance temperature of 38-43 degrees and the freezer 0-14. "
I also talked to an independent Dometic service person in Indiana during our trip, and he said dead space is problem. That is why I filled the dead space best I could with the rigid foam insulation stacked in the area space next to the fridge.

That is my 2 cents worth.
Now that is what I call a very significant first post! Thanks for the valuable information. Welcome to Air Forums.

I installed a new fridge in my 66 Tradewind about 2 years ago. I installed more insulation around the fridge to minimize the heat gain and installed baffling to direct the air flow thru the fins. Of course it works fine in the seventies but struggles in higher temperatures and when we are on the road. I am convinced now that the problem is just not enough air flow, ie. the heat transfer from natural convection is not nearly as good as that from forced convection. I have just ordered four 90 mm computer fans from Amazon for less than $40. I plan to install 3 or 4 of them in the chimney at the top of the roof vent. I will then run a test of the inside fridge temperature with the fans running and when they are not running.

I already have a remote thermometer installed in the fridge so I can see the temperature at any time without opening the fridge door. This was only $10 at Walmart.

Dan
__________________
TouringDan is offline   Reply With Quote
Old 08-10-2015, 02:56 AM   #28
Rivet Master
 
2016 30' International
Scottsdale , Arizona
Join Date: Jul 2010
Posts: 723
I looked in the outside hatch behind the fridge in our 2016 30' Serenity. There is a lot of open space back there, and no fan.

Just testing the fridge parked out beside the house today. 100 degree outside temp (and inside the Airstream), empty fridge and freezer. After being on 24 hours, lowest I could get the fridge was about 44 (and 16 in the freezer).

But by the mid afternoon, when sun was bearing on the fridge side of the coach, the fridge temp went up to 54. Freezer seems to be ok at 16 degrees, but can't get the fridge down to where I think it should be (mid to high 30's). And 54 is a no-go for food storage.

Would filling the fridge with pre-cooled stuff and running the AC inside the coach, to cool the inside of the coach down, be enough to bring the fridge down to mid to high 30's?

Do I need to install a fan or fans in the open mechanical space accessible from the outside of the trailer?

Would it help to have a battery operated fan inside the fridge?

I have much to learn here, obviously.
__________________

__________________
DHart is offline   Reply With Quote
Reply


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
Work Platform for Roof Work Bubba John Roof 18 08-02-2015 10:16 AM
Running Lights don't work, Other exterior lights work jrvly1976 Lights - Interior & Exterior 15 01-27-2015 10:27 PM
Prep Work vs Finish Work Nolavalkyrie Vintage Kin 5 10-03-2013 04:11 PM
Cleaning becomes a little work becomes a lot of work - 1964 GlobeTrottin 1960 - 1964 Globetrotter 6 04-30-2011 11:36 AM
Will my weight distrubution setup work on an AS? RV H-D Lady Hitches, Couplers & Balls 19 10-30-2010 06:52 AM


Virginia Campgrounds

Reviews provided by



Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:03 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.