How do y'all purge air from system. I got a 1600 gpm pump that feeds three wings of a school. We add a gym that has about 100 tons of cooling. We are not get any water up there. This is a engineered job. FYI we upgraded to a larger pump like specs said. We have done everything trying to found the problem. I believe it could be air. The pump is pumping 1200 gpm. 400 short of design. Any suggestions