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Old 01-09-2011, 07:33 AM   #113
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Found this thread thru one of my many searches I've been doing on this forum. Great read with some excellent info. Brought it back to the top for some of the new guys here.
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Old 01-09-2011, 01:12 PM   #114
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Found this thread thru one of my many searches I've been doing on this forum. Great read with some excellent info. Brought it back to the top for some of the new guys here.
Glad you did - I have minor updates to add.

Originally on my install, I used a bank of 3 fans, one to be on ALL the time when the refrigerator was being used, and the other 2 used with a temperature sensor switch that would activate them whenever the heat exchanger coils came up to high enough heat to trip the switch.

BUT, I was seeing enough times when the refrigerator was cold enough that NONE of the fans were needed, so to eliminate unnecessary running of the single steady-running fan, I installed another temperature sensing switch that would allow the single fan to only operate shortly after the refrigerator had actually been on for a short period, rather than full time.

We've been using the MH refrigerator since Thanksgiving for Holiday visitors, and needed some refrigerator overflow for food storage for the extra visiting family members - we had power to the MH for a little electric ceramic heater - so adding the refrigerator wasn't much extra load. In the colder winter climate here in eastern Oregon. The refrigerator holds 20 degrees, and the freezer under 0 degrees - we are still using the MH refrigerator for overflow, and the refrigerator is actually on very little, and the single fan has only turned on once briefly that I am aware of - the second temperature switch was a good move!
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Old 03-09-2011, 02:23 PM   #115
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OK, yet another refinement of refrigerator cooling efficiency - not radical, but effective.

Many here are familiar with the small dual-fan accessories that attach to the refrigerator interior cooling fin assembly - they work pretty effectively in circulating interior air for better cooling clear done to the lower shelves of the refrigerator.

I tried one, and liked it - but figured a pair of the Ebay cheapie PC cooling fans - the larger ones for circulating air inside the whole PC - would work even more efficiently in air circulation due to their larger size, covering more area of the refrigerator fin assembly.

BUT, I wanted a more gentle airflow, rather than the relative blast these fans are capable of - so I wired a pair in series so that each fan was operating at half power and speed - here's how they look installed:



How do they work? Well, my refrigerator is pretty well packed solid with stored food - stuff we'd really preferred frozen, but at least far cooler than typical interior freezer temps - so here's how ours is working with the thermostat set to it's lowest setting, temp at top shelf nearest cooling fins:



Not bad - 8 degrees - and down at the lowest shelf?



About 26 degrees - typically more like 20 degrees, but the displayed temp had increased slightly as I set up for the camera shot. Needless to say, the stored stuff is being kept quite decently cold - cold enough to keep ice cream well frozen at the top shelf - and only about a 12 degree increase in temp from the top to bottom shelf - in a VERY tightly packed and loaded refrigerator.

Connected in series, these fans only draw 180ma - about 2.5 watts - and are extremely quiet due to their reduced speed, but the gentle and even airflow is clearly doing the job!

YUP - I'm a happy camper!
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Old 05-24-2011, 10:07 PM   #116
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I'm trying to make some improvement on refrigerator by hading some fans in the back of the fridge, I allready have four 5'' fans, now my question is, if I remove those fans and install stronger ones to increase the cfm but is there such a thing as to much air, I don't want to have to much air flow and if it may cause more harm then help the performance of the refrigerator, what do you all think the more air the merrier or not? Thanks joe
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Old 05-24-2011, 10:39 PM   #117
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Do you have a temperature sensing switch controlling the fans?
If fans cycle off and on you have enough air flow through vents space. Bigger fans wouldn't be necessary.
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Old 05-25-2011, 07:49 AM   #118
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Yes I do have a thermostat and its adjustable now the question is what temperature should I set at maybe around 100 degrees? What do you think
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Old 05-25-2011, 09:16 AM   #119
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You have said within this thread that your two cooling fans are working, Norcold says page 30 they should operate at 135* and cool down to 115* before shutting off.
Not knowing where you have your therm- control located if its on the deck of your fridge floor it will operate by what you have it set for for outside temps to increase the air flow.
It would be up to you how long you would want it to stay on and how your temps inside box are cooling with the added venting of additional fans.
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Old 05-09-2013, 11:14 PM   #120
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nice wright up, old but good thanks
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Old 05-10-2013, 08:08 AM   #121
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Welcome to irv2 EBS64.
In some of the forums there are stickies LINKS at the top of them check them out will find much more good information.
I have three that follow me around the forums in my signature.
Enjoy the forums and do post often.
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Old 05-10-2013, 10:47 AM   #122
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nice wright up, old but good thanks
YUP - thanks - and still operating flawlessly...
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