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03-13-2016, 06:05 PM
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#21
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by ornery
Hello,
I saw your post about fans in the chimney. How does one do that AND power them?
Thanks,
John
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There's a 12v power source in the access panel on the outside.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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03-13-2016, 06:55 PM
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#22
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Senior Member
Join Date: May 2012
Posts: 869
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The Dometic RV (gas/electric) fridge in our 2011 Georgetown 327DS wouldn't cool below 50F with the propane burner running 100% of the time when we took delivery of the new unit. There was nothing wrong with the fridge. There's space on both sides of it and around 6" of dead space above it. When that side of the rv was facing the sun, the space around the fridge was a heat trap with temps well over 110. There was just too much heat being applied to the outside of the case for the cooling unit to keep up.
The dealer pulled the fridge and installed fiberglass insulation panels on the sides and above it. It immediately started cooling properly on both gas and electricity.
Phil
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03-13-2016, 07:23 PM
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#23
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Senior Member
Join Date: Apr 2012
Location: South Carolina
Posts: 1,441
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Quote:
Originally Posted by Stank Bait
"since those fins just pull the cold from the cooling plate i would think to much air on them would hurt the efficiency of the fin"
Would like to know the reasoning ??? Just asking.
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More air flow over fins, or any other surface, will always increase the heat exchange rate. It does eventually become a diminishing returns factor.
__________________
RamblerGuy
2011 Sunseeker 3100
2016 Ford Edge Toad
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03-13-2016, 07:28 PM
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#24
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Senior Member
Join Date: Apr 2012
Location: South Carolina
Posts: 1,441
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DSQR's post, #11, is interesting information. My refrigerator is a Dometic DM2652. The nameplate gives "1500 BTU/hr (440 watts)" but does not list the LP burner rating. If someone can come up with the burner rating for a DM2652, that would help.
I was hoping someone could point to a rigorous test of gas vs. electric modes. Our Sunseeker is in storage so I can't run it on one, let it sit not running to warm back up, then run it on the other, to get a good comparison.
__________________
RamblerGuy
2011 Sunseeker 3100
2016 Ford Edge Toad
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03-13-2016, 07:54 PM
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#25
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Senior Member
Join Date: Dec 2010
Location: East Berlin
Posts: 734
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Agree moving air helps to cool faster and keep a more consistent temperature. It would be nice if the makers of adsorption fridges would incorporate a fan that would come on and shut off when the fridge ran to cool things.
If you take an infrared temperature gun the fin area is below freezing in the fridge section that is why it eventually frost up. Being able to move that excess temperature to other areas of the fridge by a fan makes it more efficient.
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03-13-2016, 07:57 PM
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#26
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Senior Member
Join Date: Sep 2015
Posts: 3,464
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Where did you tag the 12v inside the fridge?
2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS
__________________
2017 Dynamax Isata 4
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03-13-2016, 07:57 PM
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#27
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World Wide Wanderer
Join Date: Feb 2016
Location: Sprung Leak, NC
Posts: 1,732
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Quote:
Originally Posted by RamblerGuy
DSQR's post, #11, is interesting information. My refrigerator is a Dometic DM2652. The nameplate gives "1500 BTU/hr (440 watts)" but does not list the LP burner rating. If someone can come up with the burner rating for a DM2652, that would help.
I was hoping someone could point to a rigorous test of gas vs. electric modes. Our Sunseeker is in storage so I can't run it on one, let it sit not running to warm back up, then run it on the other, to get a good comparison.
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Same one I have, still trying to find the LP burner input. I have spec's from my last RV that had a Norcold in it. I may email Dometic and ask that question, as well as what the LP consumption rate should be. I can figure out electrical draw pretty easily with a kill-a-watt, not so easy on LP.
Aaron 
__________________
Aaron & Rhonda
wahoonc & Airangel60
2016 Coachmen Concord 300DS
2015 Fusion Hybrid following along
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03-14-2016, 09:26 AM
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#28
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Senior Member
Join Date: Feb 2015
Location: in my new 29hfsxlr
Posts: 1,658
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a fan in the fridge helps , not ? that . it seems to much air would cause it to take longer to cool as you would be transferring more warm air over the fins then could be transferred by the cooling plate and fins . eventually it would all catch up . again IMO a smaller fan moving air slower over the fins would allow things to cool faster .
it would be like taking the Tstat out of your car radiator the water would move to fast slowing heat up time and then once up to temp allow the water to move to fast through the radiator to get it cooled off which can cause over heating
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03-14-2016, 09:42 AM
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#29
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,152
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Quote:
Originally Posted by Kenny kustom
Where did you tag the 12v inside the fridge?
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Interior light or run the wiring out through the drain tube.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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03-14-2016, 09:48 AM
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#30
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,152
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Quote:
Originally Posted by northstar1960
a fan in the fridge helps , not ? that . it seems to much air would cause it to take longer to cool as you would be transferring more warm air over the fins then could be transferred by the cooling plate and fins . eventually it would all catch up . again IMO a smaller fan moving air slower over the fins would allow things to cool faster .
it would be like taking the Tstat out of your car radiator the water would move to fast slowing heat up time and then once up to temp allow the water to move to fast through the radiator to get it cooled off which can cause over heating
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As Turbs said, don't overthink it.
These fans that attach to the interior fins do no move a lot of air, just enough to gently circulate the air inside the box. They work great!
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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03-14-2016, 10:19 AM
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#31
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Refrigerator - Gas or Electric Cools Better?
Quote:
Originally Posted by Kenny kustom
Where did you tag the 12v inside the fridge?
2016 Sabre 36QBOK
2015 Ram 3500 CUMMINS
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Outside fans.
Lower left hand of outside fridge compartment.
There's a black cover on a box, inside you'll find a 12v circuit that is live when fridge is on and dead when fridge is off.
For the inside fridge fans use the power for the light.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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03-14-2016, 10:41 PM
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#32
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Senior Member
Join Date: May 2013
Posts: 599
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Ok, so do these fans work all thw time, or only when light is on. Im confused  ?
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03-14-2016, 10:56 PM
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#33
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Senior Member
Join Date: Jun 2015
Location: Pensacola, FL
Posts: 1,645
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Quote:
Originally Posted by Kuba
Ok, so do these fans work all thw time, or only when light is on. Im confused ? |
All the time. Power is taken from the supply side of the switch, not the load side.
__________________
2019 Coachmen Freedom Express 192RBS
2015 T12RBST Flagstaff Hardside
Disclaimer: The actual value of my "Two Cents" of advice varies just like a bitcoin.
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03-15-2016, 05:23 AM
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#34
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World Wide Wanderer
Join Date: Feb 2016
Location: Sprung Leak, NC
Posts: 1,732
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Quote:
Originally Posted by Kuba
Ok, so do these fans work all thw time, or only when light is on. Im confused ? |
I put my outside fans on thermostats, inside fan I use an alligator clip on the negative side for quick disconnect. If it is cool outside and the fridge is holding a decent temp I will disconnect the inside fan. I monitor my fridge and freezer temps with the Accu-Rite wireless system. I liked them so well I bought a couple for the house fridges too.
Aaron
__________________
Aaron & Rhonda
wahoonc & Airangel60
2016 Coachmen Concord 300DS
2015 Fusion Hybrid following along
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03-15-2016, 06:52 AM
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#35
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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The interior fans are on as long as the fridge is on, there is also an on/off switch on fan bracket to manually turn fans off.
The exterior fans are on a thermostat but are also only on as long as fridge is turned on.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
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03-15-2016, 06:54 AM
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#36
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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Fans are easy to install I used two snap discs to control 12v to fans, one on boiler of fridge a 150* snap disc controls power supply to fans and one at fans 90*up in the chimney. This way the fans only run if the fridge is turned and hot and not when fridge is off and the sun is beating on the side wall heating the compartment to above 90*
__________________
Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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03-15-2016, 06:59 PM
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#37
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Senior Member
Join Date: May 2013
Posts: 599
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Nice! Tnx guys. Next mod on the list 
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03-19-2016, 03:39 PM
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#39
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Senior Member
Join Date: May 2013
Posts: 263
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03-19-2016, 03:40 PM
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#40
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Senior Member
Join Date: May 2013
Posts: 263
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