Download the assembly and or manual below:
Assuming that you don't want to physically print the 75 page assembly manual, I made a four sheet check list to print out and keep track of where you are in the assembly process.
The assembly manual was updated 2/24/22 to include a check-out/start-up procedure.
If you are looking for the ATU assembly/operating manual, download it from the ATU-500 page.
Here is a demo of how to install the Hardrock-500 AC wiring harness: