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Old 07-20-2014, 10:03 AM   #241
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Jim,
Yes, The T/C are made out of very thin wires which I located one in the fridge,freezer and then just closed the fridge door on the wires. The attached picture of the T/C probe is the one I am using to measure the outside air temperature. I use this set to troubleshoot AC refrigeration systems by being able to accurately measure superheat and subcooling you can pretty much determine how well the refrigeration system works.
As for the fridge fix fan circulation of the air in the refrigerator it has to be helping with quicker cooling down of the content in the refrigerator. So I think it just make sense that you would want to have a fan in your refrigerator. This is my first RV with refrigerator in it so really I'm just starting to learn the limits of an RV Fridge.
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Old 07-20-2014, 10:23 AM   #242
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Which may mean Marks instrument is actually calibrated!
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Old 07-20-2014, 10:27 AM   #243
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Oh, I agree Charlie, these wireless units are about as accurate as a politician. To me they tell me something is working, but I would not rely upon mine for anything other than observations.
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Old 07-20-2014, 10:35 AM   #244
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There is two simple test to check the accuracy of your TC units.
1. Use a glass with water and ice well mixed the reading should be very close to 32 f

2. Boil water take a measurement your reading should be very close to 212* F
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Old 07-20-2014, 11:08 AM   #245
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Can not do, mine are wireless/battery operated.
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Old 07-20-2014, 12:52 PM   #246
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[QUOTE=markvt;59817]
Quote:
Originally Posted by markvt View Post
My mileage out the new fridge fix fan installed in our Dometic 6.7 fridge today. The fridge temperature readings where taking after six hours of the fan running. The fridge was on the highest setting ,fridge was empty ,outside air temp was 80* F at the start of the test and after six hour outside air temp dropped down to 71* F at the time these reading where taken.
T/C A. fridge freezer. 02 * F
T/C B fridge 38* F
T/C C outside 71 * F
Humidity 59.9 %[/

Update 18 hours after the fridge fix installation
T/C A. fridge freezer. -06F
T/C B fridge 23* F
T/C C outside 62*F
Humidity 70 %

Wow that not very impressive after running 18 hrs and with only a 39 degree difference between the fridge and ambient temperature.

With our 2009 19 and ambient temperature of over 80 if we turned our fridge past 4 we would end up with frozen lettuce. Sure would like to know what the difference between the fridge units is...


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Old 07-20-2014, 12:57 PM   #247
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Quote:
Originally Posted by cpaharley2008 View Post
Can not do, mine are wireless/battery operated.
Sure you can Jim put the probe in a double sealed zip lock bag and place in the ice water. I wouldn't try this in boiling water but would work in ice water.
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Old 07-20-2014, 01:27 PM   #248
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While air temperature measurements are useful, particularly when comparing changes, the official Dometic method of measuring refrigerator temperature is to place the sensor in a glass of water. That is the way a Dometic trained service tech will make the measurements. I suspect that helps even out the variations caused by the location of the sensor as well as provide a better average.

Of course that might be a problem in the freezer...

I use the same wireless thermometer that Jim has in his fridge for monitoring my 5 cu ft fridge. After many modifications to the space behind the refrigerator to make it conform to Dometic's clearance specifications, I am able to keep the refrigerator temperature under 40F & the freezer under 0F at outside temperatures under 95F. I do have to use an exhaust fan & crank the temperature dial to 7 during a 95F day but it works.
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Old 07-20-2014, 01:56 PM   #249
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Quote:
Originally Posted by Vermilye View Post
the official Dometic method of measuring refrigerator temperature is to place the sensor in a glass of water.

Of course that might be a problem in the freezer...
It's also the method used by most refrigerator repair techs. For the freezer, they usually recommend placing a temperature probe between two bags of frozen vegetables. In both cases, they wait 24 hours before reading the temp.
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Old 07-20-2014, 02:06 PM   #250
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[QUOTE=PGDriver;59828]
Quote:
Originally Posted by markvt View Post


Wow that not very impressive after running 18 hrs and with only a 39 degree difference between the fridge and ambient temperature.

With our 2009 19 and ambient temperature of over 80 if we turned our fridge past 4 we would end up with frozen lettuce. Sure would like to know what the difference between the fridge units is...


Doug
Hi Doug ,
The 39 * F reading in the fridge was after the first six hours of running on the highest setting.
The second reading of 23* F was after the 18 hours of running
Mark
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