The pasteurization is carried out for a prolonged time at around 170°F and is supposed to kill only heat susceptible organisms and their spores, while sterilization works at a temperature of 250°F and is supposed to kill all organisms.
Fractional sterilization or tyndallization is a method used to destroy bacteria and endospores in preparation of grain spawn(rye, wheat, millet, birdseed.
Rules preclude me from scanning the instruction booklet, (wish I knew this 45 min. ago), but I found this link for all you used weight-type PC buyers out there.