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Old 06-28-2016, 01:13 PM   #1
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Upgrade questions

Two questions for the group.
1.) I want to add a "traditional" dial thermostat to my dometic refrigerator instead of the factory slide adjuster.

2.) Our AC cover is black, to me this seems somewhat counter intuitive. I would think a white cover would make it more efficient. Is there a reason they use black, or should I swap it out for a white one?
Thanks everyone!
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Old 06-28-2016, 01:31 PM   #2
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I had to change my black vent cover as the original fell apart, and all I could buy was white. Since then, the Norcold is a little colder...
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Old 06-28-2016, 08:18 PM   #3
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Maybe black to be "styling"...

Paint it white and look for a uv blocking paint.

Check the model number of your ac then locate a manual.

Some have basic switch type controls where others have electronic controls that are matched to the ac.

If in doubt contact ac manufacturer after you get the full model nunber.
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Old 06-29-2016, 02:04 AM   #4
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Black maybe because it's inherently better at UV protection!?!?
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Old 07-01-2016, 11:47 AM   #5
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I doubt if the shroud color has much to do with a/c performance, which depends pretty much entirely on the flow of air through the heat exchanger coils (fins). As long as the exterior fan is sucking air through, the shroud color probably makes little, if any, difference.

Before changing the fridge temp control, you need to understand how the present one works. The slider is not the entire thermostat - the "thermister" is sensing the actual temperature. The slider is either directly biasing the thermister reading (changing the resistance in the circuit) or separately giving the fridge controller input on the desired temp so it can do the "bias" itself. Read the Service Manual for your model Dometic to see how it works (you may have to deduce that from the circuit diagram if not explained in detail). Frankly, I don't see why you would bother, but whatever rows your boat...
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Old 07-04-2016, 01:28 AM   #6
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call me stylin

Quote:
Originally Posted by Gary RVRoamer View Post
I doubt if the shroud color has much to do with a/c performance, which depends pretty much entirely on the flow of air through the heat exchanger coils (fins). As long as the exterior fan is sucking air through, the shroud color probably makes little, if any, difference.

Before changing the fridge temp control, you need to understand how the present one works. The slider is not the entire thermostat - the "thermister" is sensing the actual temperature. The slider is either directly biasing the thermister reading (changing the resistance in the circuit) or separately giving the fridge controller input on the desired temp so it can do the "bias" itself. Read the Service Manual for your model Dometic to see how it works (you may have to deduce that from the circuit diagram if not explained in detail). Frankly, I don't see why you would bother, but whatever rows your boat...
X2 on the refer. "temperature controller".
Might be able to tweak the thermistor placement slightly?

I also agree with the A/C cover assessment.
We noticed a choice on the latest coach's build sheet. Although, I was overruled by the DW who is, well ... yeah, even though "stylin" is not my middle name.
I had to replace one of those covers on the last coach, darn things were $85 ea. plus shipping, either color. I'd have to see a big efficiency boost.

Happy motoring.
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Old 07-04-2016, 01:55 AM   #7
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Thermistor .......it senses the FIN temp which is then used by the thermostat to control cooling cycle. (FIN temp is 10*F colder than food compartment temp)

If you have an adjustable temp setting on upper panel then thermistor S/B clipped to far right fin and mid position

BUT if you do NOT have any adjustments (auto temp control) you can make minor temp changes by repositioning the thermistor (4*F - 6*F Overall change)
Still S/B on far right fin but if you move it: slide the clip
UP----cooler temp in food compartment
DOWN----Less cooler temp in food compartment

Dometic used the 'Auto Temp Control' on some models
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Old 07-04-2016, 06:58 AM   #8
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I've been reading abut this kit and most of the reviews a good.
Dometic Thermistor Repair Kit

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Old 07-04-2016, 07:11 AM   #9
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I agree with the OP about the a/c cover being black. I pulled ours off and painted it a nice white with rattle can Krylon for plastic. The new second a/c was ordered with a white shroud. All 4 of the tank vents were black - and when 2 came up broken while pulling the cover off, white replacements were installed on all four. While it probably doesn't make much of a real difference, it does in my mind What I can't easily change are the 4 slides ends which are .... black and they do absorb lots of heat, hence the second a/c. Dumb of Keystone for that design and, unfortunately, even dumber of us for not seeing that error in 'style'.
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Old 07-04-2016, 11:32 AM   #10
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I must have the same rv as the OP... Why would you put a black cover on a AC ??? And the slider thing in the fridge... hmmm... Good answers here ....
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Old 07-04-2016, 12:29 PM   #11
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The very small difference in heat load due to the black is negligible. If the A/Cs are relatively new and the covers are in good shape, get some white Krylon paint for plastics and repaint the covers. It will last for a few years and be much less expensive than new covers.

Ken
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