AZ ROC C-77 Plumbing Including Solar (Commercial) Practice Questions - Arizona ROC C-77 CR-77 Plumbing Including Solar (Commercial) Examination Exam

All solar loop piping above the drainback tank must slope downward continuously toward the tank at a minimum of 1/4 inch per foot with zero traps or dips Collector return piping must be trapped below roof line to maintain a permanent liquid seal at all times Solar collectors must be installed perfectly level with horizontal supply lines to prevent air pockets Drainback lines must be sized one pipe size smaller than supply lines to create backpressure during shutdown