Dometic AC doing Weird things
It was suggested I post here for suggestions on this. I have narrowed the symptoms down a little more since noticing this issue. It has to do with how cold I set the Thermostat. Anything colder than 6...
Forum Discussion
Thanks j-d. I found that site this weekend, and saved a few docs from there.
It seems like a nice system, with the AC board controlling function of when the heater works also. There is a way to test the resistance of the freeze thermistor, but it's a pain, as the resistance changes according to the temperature it is. My thoughts are since this AC was upgraded to 15K btu, from the factory 13,5 btu?, that the evaporator coil may be trying to freeze due to less than idea volume of air flowing through it? Low air flow will tend to freeze evap coils. I did home and commercial AC repair for years.
I'm wondering if it would be worth adding another ac duct vent to help with the flow? I know there must be alot of air flow resistance, because when I open the slide louver on the AC cover, it roars. But all the vents flows good through out the trailer. Four, of the what look like four inch, round vents.
You know, the more I think about this, that might be the issue. One way to test is open the cover louver wide open, run the stat down to 55 or so, and see if it shuts off, like it has been from time to time.
2002 Sprinter 260-RBS, 28 footer.
Eta I just found this, nicehttp://bryantrv.com/docs2/docs/singlezonediag.pdfDuoTherm Single Zone LCD Diagnostic Mode , that lets you step through individual functions, fan, compressor, heater etc, as well as checking the reported evap coil temperature. That will tell me what the thermistor is reporting for temps. Thanks for the doc
It seems like a nice system, with the AC board controlling function of when the heater works also. There is a way to test the resistance of the freeze thermistor, but it's a pain, as the resistance changes according to the temperature it is. My thoughts are since this AC was upgraded to 15K btu, from the factory 13,5 btu?, that the evaporator coil may be trying to freeze due to less than idea volume of air flowing through it? Low air flow will tend to freeze evap coils. I did home and commercial AC repair for years.
I'm wondering if it would be worth adding another ac duct vent to help with the flow? I know there must be alot of air flow resistance, because when I open the slide louver on the AC cover, it roars. But all the vents flows good through out the trailer. Four, of the what look like four inch, round vents.
You know, the more I think about this, that might be the issue. One way to test is open the cover louver wide open, run the stat down to 55 or so, and see if it shuts off, like it has been from time to time.
2002 Sprinter 260-RBS, 28 footer.
Eta I just found this, nicehttp://bryantrv.com/docs2/docs/singlezonediag.pdfDuoTherm Single Zone LCD Diagnostic Mode , that lets you step through individual functions, fan, compressor, heater etc, as well as checking the reported evap coil temperature. That will tell me what the thermistor is reporting for temps. Thanks for the doc
