Help! Wiring Question For Coleman Mach 15 A/C Unit

[Kubo2021]

So, I attempted to clean the AC coils on my trailer today and I may have made a boo-boo during the process. Any guidance from the community is appreciated.

After removing the main shroud to the A/C unit on the roof, I was able to clean the condenser coils just fine. However, when I went to clean the evaporator coils, I had to remove another piece of covering that was fitted over the evap coils, along with a bunch of wiring that I didn't realize was there. During the process of unscrewing the secondary cover and lifting it off the evaporator coil, I think I may have accidentally pulled the red wire out from one of the plugs on the control box — problem is, I don't know if that wire did or did not pop off a prong as the cover was so tight to pull off and once it did come off, it happened suddenly and I feel like in that process I accidentally pulled the wire at the same time.

I'm hoping someone much smarter than me can help me figure out if the red wire is meant to be plugged in and which specific plug/prong it should be assigned to (photos attached). I tried looking for a wiring diagram online but couldn't find anything that made any remote sense to me.

I am no electrician, and I've never dealt with my A/C unit in this way as this was the first time I was cleaning my coils since I purchased the TT back in 2021. I'd love to not blow up the A/C unit, or worse, the entire electrical system of the TT before my trip that starts in 2 days.

Help, please

FYI - I own a 2021 Rockwood Ultralite TT, fitted with a Coleman Mach 15 A/C unit (Model #48204-669).

 

[Kirk]

I have no doubt that the connection for that wire was there before you did the work as it would have been tied back and/or insulated if it were not. It is what we call a spade connector and probably was on one of the terminals in your pictures. I did find a copy of the installation instructions but there is no schematic to look at and that is what is needed. The only schematic that I have been able to locate is one for the 9000 series models which I am pretty sure predate the one that you have so have no way to know if they are the same.

What I suggest that you do is to trace that red wire to see what it is connected to.

 

[Tulecreeper]

I'm pretty sure running the unit with a wire disconnected isn't going to hurt anything. If all else fails, leave it disconnected and go inside and turn on your A/C and run through all the controls. Whatever doesn't work, that's the missing connection. Then let Kirk know what's not working and he might point you to the tab to plug it back into.

 

[Kubo2021]

I have no doubt that the connection for that wire was there before you did the work as it would have been tied back and/or insulated if it were not. It is what we call a spade connector and probably was on one of the terminals in your pictures. I did find a copy of the installation instructions but there is no schematic to look at and that is what is needed. The only schematic that I have been able to locate is one for the 9000 series models which I am pretty sure predate the one that you have so have no way to know if they are the same.
View attachment 165513
What I suggest that you do is to trace that red wire to see what it is connected to.

Thanks for looking into this with me. I agree, I am convinced that the red spade connector is meant to be plugged into one of the terminals. And I managed to find installation instructions for what I believe to be the same A/C unit, or at least same setup, just under a different sub-brand. Based on what I can tell, the red spade connector needs to be connected to the R+ terminal, which provides +12 VDC to upper unit control box. From what I'm reading, this delivers power to the thermostat unit, so I probably need to have that plugged in for anything to work.

With that question somewhat solved, my next dilemma is figuring out which of the two R+ terminals I need to be plugging the wire into. I notice there's two for the R+ terminal. Do you now if matters at all whether it's the top or bottom terminal?

 

[Kubo2021]

PS. If anyone has interest in finding the instruction manual for unit installation, this is the link: https://www.rvupgradestore.com/v/vspfiles/assets/pdf/control-manual.pdf

 

[Kirk]

I notice there's two for the R+ terminal. Do you now if matters at all whether it's the top or bottom terminal?

If you are correct about where the lead belongs, it would make no difference at all because the two spades are physically connected and held in place by a center rivet which is common.

 

[Kubo2021]

If you are correct about where the lead belongs, it would make no difference at all because the two spades are physically connected and held in place by a center rivet which is common.
View attachment 165538

I've confirmed that the lead belongs to the R+ terminal and thanks for the information on either spade being acceptable to plug into. The A/C is running as normal and we are in business. Thanks!