Dometic 6.7 cf fridge performance

[markvt]

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.

[tractors1]

Which may mean Marks instrument is actually calibrated!

[cpaharley2008]

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.

[markvt]

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

[cpaharley2008]

Can not do, mine are wireless/battery operated.

[PGDriver]

[QUOTE=markvt;59817]

Originally Posted by markvt

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...


Doug

[markvt]

Originally Posted by cpaharley2008

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.

[Vermilye]

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 40°F & the freezer under 0°F at outside temperatures under 95°F. I do have to use an exhaust fan & crank the temperature dial to 7 during a 95°F day but it works.

[rbryan4]

Originally Posted by Vermilye

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.

[markvt]

[QUOTE=PGDriver;59828]

Originally Posted by markvt

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

[escape artist]

Hi: markvt... Careful there!!! We had to start putting the lettuce heads into a thermal lunch bag so they wouldn't freeze!!! Alf
escape artist N.S. of Lake Erie

[cpaharley2008]

Too many 39's here, I think he was referring to the difference between 62-outside temp and 23, the refer temperature. As far as that differential, I'm not too surprised as I'm sure the manufacturers built in a max low for the refer, so if the outside was 50, it would probably still remain at 23. In addition if the outside was 40 degrees, I do not think the refer will drop to 1 degree, it should remain at 28 or higher.

[PGDriver]

Originally Posted by cpaharley2008

Too many 39's here, I think he was referring to the difference between 62-outside temp and 23, the refer temperature. As far as that differential, I'm not too surprised as I'm sure the manufacturers built in a max low for the refer, so if the outside was 50, it would probably still remain at 23. In addition if the outside was 40 degrees, I do not think the refer will drop to 1 degree, it should remain at 28 or higher.

Thats what I said alright.....

[markvt]

Sorry Doug I miss read your posting.

[PGDriver]

Well just out of curiosity I contacted RV Cooling Units to see if there was an Amish Cooling Unit (they are much more efficient then the stock ones) made to replace the one in the Dometic RM8555 and this is the response I got.



Thanks for the note and question about the model 8555. Sorry we do not have are placement for that model, since it was more for oversea use where AC voltage is 230vac. You are the first customer that has asked about that model.
Thanks,
David Force

RV Cooling Unit Warehouse

[rbryan4]

Originally Posted by PGDriver

Well just out of curiosity I contacted RV Cooling Units to see if there was an Amish Cooling Unit (they are much more efficient then the stock ones) made to replace the one in the Dometic RM8555 and this is the response I got.



Thanks for the note and question about the model 8555. Sorry we do not have are placement for that model, since it was more for oversea use where AC voltage is 230vac. You are the first customer that has asked about that model.
Thanks,
David Force

RV Cooling Unit Warehouse

Not surprised. The RM8xxx series is sold in europe (230V) but also in North America (120V). Camping World calls them 'Dometic Euro' but Dometic makes no such distinction.

[Mike@SmartRVProducts]

Originally Posted by alanmalk

Welcome Mike;
I probably speak for a percentage of future Escape owners. We would appreciate access to your new product as our trailers are built and delivered, but can't place an order until then. So, if you are inclined, please consider making a few spares over and above the current production run.

Thanks,
Alan

Thank you VERY MUCH for the welcome. I have been reading this thread, and it just seems like there is a great group of people here. I think that is our favorite part of the RV world: The People!

I wanted to let everyone know that we are running another 25 units for the Escape forum group. We anticipate having them done by the end of the week. We would like to update our instructions. If anyone is willing to share some pics of their install, and possibly the wire they chose for the power source, that would be fantastic.

We appreciate the feedback on the units so much. for those who have installed the unit, please keep sharing your experience with the group.

Question: Would the group prefer a fan unit with no blue LED's?

--Mike

[azjack]

Blue is good for me.
Jack

[cpaharley2008]

The white wire is the power wire in our units, not the brown wire.

[cpaharley2008]

As far as the response from the Amish, I'm not surprised as they specialize in rebuilt older units and the #8555 is too new to have many or any rebuilt.