Tire question

I bought some new tubes and tires for my old mini bike. This has the split rims.
What should my tire pressures be?
The tire size is 4.10/3.50-6.
The instructions that came with my Azusa kit (which has split rims) said 15lbs, nothing more.

The rims actually had 30 max printed on them, the tire said more than that, be careful...