Install an HPC on a 60amp breaker?

An HPC was included with my roadster when I bought it (used), but I only have 60 amps available in my garage. Can I install it and set the max charging rate to 48amps on the charger? The install guide implies this ability with a chart showing charging rates based on 80% of the breaker rating, but it doesn't say how to about tell the charger its connected to a 60amp breaker. I know I can tell the car to charge at a specific rate.

dhrivnak: thank you for that info. I looked at it carefully and yes it is a Clipper Creek charger. I opened it up and did not see anything to change settings, just a huge connector and a circuit board. It looks really easy to wire up. I called Clipper Creek and he told me they would re-program the circuit board if I sent it in to them, at no cost.
The charger has a permanent Roadster connector, so no other car can plug into it. He said that if I just set the roadster charge limit to 48amps, I could use it as is because the vehicle controls the charge, not the charger. He added that the worst case scenario is that the breaker would trip. So, I'm trying to decide how I feel about removing the circuit board from the unit and mailing it, vs being careful to set the charge rate on my roadster.