Air Shocks & PSI ??

[PLANETGETLOW]

I installed a set of Air Shocks on my sons truck and have never used a set before I'm not sure what the max PSI should be?

Seems like it starts raising around that 80-100 range but I don't want to get much higher thinkin I'll damage something.

If anybody can give me a baseline I'd appreciate it?

Minimum says 15psi
Testing says 40psi

Then it says to adjust to desired ride height but doesn't mention max. Can you max these out?

Here's a pic of these for reference:
Columbus Air-Levelizer