AVION Travel Trailers

My air con has no markings on it internally and I was looking at being able to drop down the interior portion about an inch to accommodate a roof panel to cover some imperfections in my center panels from the PO’s. When I looked into the vent area I noticed three coils that look to me to be heater coils, although they might be something completely different. Does anyone have any pics of their interior panel to share that I could use to determine what each knob does and maybe any ideas on what those coils are for? I didn’t think about taking pics of the coils or even asking about them before I had put everything back together.
I think I can drop the unit an inch with longer j-bolts and a little duct work. Maybe...

I know our A/C has the capability of adding heater coils for some electric heat, but doesn't have them installed. Yours apparently does!

Without any model identification, all I can offer is what I know about ours.
Two knobs (obviously)
One is the thermostat
The other is the "function" switch"..... Off, heat, Low A/C, Medium A/C, High A/C, low fan, medium fan, high fan.

That "heat" position will provide power to the coils to provide heat. See page 2 of the attached manual.
I have a feeling that if you remove the ceiling cover, you'll find a tag that has the model ID on it.

Thanks Paul,
For some reason your pdf isn’t downloading properly for me. I had the cover off and I couldn’t find any identification anywhere on it. Maybe the po removed them when they removed the knob stickers. Not sure why they would have done that but there’s lots about this trailer that has me shaking my head. I know the left knob when looking from the rear is the thermostat I’m just trying to make some labels to say where on the right knob the different settings are.

Let’s try this

That will work. Once I get on more power than a single 15 amp circuit I will make sure mine is the same. Thanks.