A/C Operation
I am seeking opinions on the best way to operate RV air conditioners. Should I run them on low fan and just have the compressor cycle or run on auto and have the whole unit cycle? Which is easier on t...
Forum Discussion
It depends on your AC type and controls. Do you still have the 1999 KSDP? If so, do you have the 4 button or 5 button Dometic AC tstat control? Do you have an HP or AC only. If you have the 4 button and a HP and you run on LO cool, the AC will probably freeze up as the 4 button did not have a freeze sensor. The 4 buttons could not accept a freeze control. That is one reason Dometic went to the 5 button wall tstat in 2001 and dropped the 4 button. Also, how many units do you have on the roof? Most KSDP had 2 roof units. BUT 1999, Newmar failed to install enough return and exhaust round ceiling vents. Your unit requires 18 round ceiling vents. 9 intake and 9 exhaust. If you do not have this many your unit cannot adequately cool correctly and WILL freeze up.
Now, to the original question. IF you have a WALL TSTAT, then your roof AC has a freeze Thermister. So, operation is up to your preference. Auto means it will run on HI COOL and as it gets closer to set temp it will go to lo COOL and then shut off the fan and compressor when it reaches the set temp. Now, if you would rather have the FAN run continously either on HI or LO to circulate air all the time then set to HI cool or Lo COOL, and the compressor will cycle on and off, but the fan will always run at the set speed.
If you have mechanical roof mount AC controls, then on LO cool the AC WILL freeze up in hi humidity or higher ambient temps as Mechanical controls have no freeze control. HI COOL keeps the freezing from happening. Doug
Now, to the original question. IF you have a WALL TSTAT, then your roof AC has a freeze Thermister. So, operation is up to your preference. Auto means it will run on HI COOL and as it gets closer to set temp it will go to lo COOL and then shut off the fan and compressor when it reaches the set temp. Now, if you would rather have the FAN run continously either on HI or LO to circulate air all the time then set to HI cool or Lo COOL, and the compressor will cycle on and off, but the fan will always run at the set speed.
If you have mechanical roof mount AC controls, then on LO cool the AC WILL freeze up in hi humidity or higher ambient temps as Mechanical controls have no freeze control. HI COOL keeps the freezing from happening. Doug
