Here's "official" info:
https://www.airxcel.com/rv/coleman-m...iling-assembly
That ceiling assembly replaces your current ceiling assembly. The ceiling unit I installed also has controls for an electric heat strip, so if your unit has an electric heat strip make sure to take that into account. My unit did not have the electric heat strip, but I guess now I could add one if I wanted to
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It's fairly easy to install, took me about 1 hour. It provides nice digital control of your A/C, that you can also pair via bluetooth with either an Android device or iPhone to give you full remote control. If you take the covers off the intake filters, and the filters out, there are 3 screws (I think) on each side that hold the ceiling assembly on.
You do have to install an additional control box into the A/C unit itself (from inside the camper, you do not have to do anything external on the roof). I was confused a bit about where to install the control box because it did not want to fit where the instructions said it would, so I just actually stuffed it up in the space rather than bolting it in. Then when all done, I noticed the instructions said that on certain A/C units the control box had to be bolted in "upside down". I never went back in to correct that and it is still just fine.
Everything you need to install the unit comes with it, including a new duct. It's basically turn off the A/C breaker and remove old ceiling unit. Remove the old duct (like 4 screws). Remove the old metal frame that the ceiling unit attaches to (4 long screws/bolts). Install new metal frame, move the wiring from the old ceiling unit to the new control box and install the control box into the correct space inside the a/c unit. Install the new duct, plug the ceiling unit into the control box, and screw the ceiling unit to the new metal frame. Oh, there is also a freeze sensor that get's stuck into the cooling fins of the condenser and a remote room temp sensor that gets attached to one of the mounting screws. Everything is done from inside the camper.
You get:
1. Digital control of your A/C on the ceiling panel itself, and the thermostat goes down to like 35 degrees! Way lower than the dial on the old unit went.
2. Remote control of your A/C on an Android device (phone or tablet) or iPhone.
3. A second mode of operation where the fan can cycle on and off with the compressor. The normal mode where the fan is always on and the compressor cycles is still available. There is also a fan only mode. Two speeds, hi/low.
4. My unit also has a heat mode, if I installed an electric heat strip.
5. Freeze protection that shuts off the compressor if the condenser develops ice build up.
6. The two extra cold air outlets that can be directed for spot cooling.