Colleen,
I posted this earlier:
Always run on high speed if your system is prone to freeze up.
We go by a 20 degree temperature drop in the A/C business, from the supply to the return, on my main ducted unit it is more like 25 to 30 degrees, that alone tells me that the duct work in the ceiling is too small, you can 'cheat' on this by opening the 'dump' damper a little, and duct 60% or so to the rest of your unit, that may be the answer.
Use a thermometer to check, 20 degrees should never freeze as long as you don't want it 60 degrees in your RV.
Basically, open the damper about half way, then check to see if you are getting air upstairs, if not, close it a little until you do, see if this helps.
The converter replacement will have no effect on the A/C unit operation.
Ozz
'07 3400RL 2nd RTU
2 Golf Cart batteries 3,000 watt inverter, automatic transfer switch
Honda 2000 Generator, Maytag's with 220 Dryer
Stationary domed Sat. dish, LCD 12 Volt Amp gauge, LCD Tank Monitor
3 added 120 volt outlets, On Board Air; 12 Volt Viair 450C compressor
2006 Ford PSD 4x4 Off Road Lariat, Hadley Air Horns, Truck inverter with 110 volts: laptop, Color Backup Camera, Awning lock
