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Originally Posted by jasin1
Well that’s good to know! Thanks for the detailed explanation!
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Dometic doesn't put that information in the Air Conditioner manual, rather it's in the thermostat manual (where the temperature/fan control are managed). Seems backwards to me, but that's the way Dometic's documentation is arranged....
Here's the Dometic thermostat manual for the single zone digital thermostat. The dual zone is similar, just an "expanded function model". When Keystone incorporated the thermostat function into the In-Command system, the "documentation sort of fell by the wayside" but the rooftop A/C units still are looking for the same "control input from the temperature sensing function" regardless of where it's monitored.
In this manual, the fan function is explained on page 7 and the "HI/LO fan" is explained on page 11 in the "Special Features" section. That's where the >5 and <4 degrees fan speed function are documented. To me, it's a "round about way to explain the fan speed control" but, what the heck, it's Dometic for you.....
OOPS: Forgot to attach the pdf for the thermostat. here it is: