How do I prime the A and B materials in an empty proportioner?

Fill the A and B hoppers with proper materials, with the A side (blue) filled with the major volume and the B side (green) with the minor volume (unless 1:1 mix ratio). Close the Mixed Material Handle (FE), open the Circulation Handle (FC), then slowly increase the Primary Air Motor Pressure Regulator (MB). Dispense material into containers until clean material comes out of the A and B circulation lines, then move the circulation lines back to the hoppers. (Page 30)