Two multi-head systems each containing four indoor head units and one outdoor unit. Owners are very concerned with the improper installation of the equipment that may result in a lawsuit against the installing contractor or general contractor. Today's inspection test run and minimal disassembly for test running has has concluded with several results. 1- The drain line manifold in the shop mechanical room is higher than the wall mounted units and will not drain upward to go over a wall.. Even with the assistance of Blue diamond Maxi pump the pressure of a 2-in manifold 4 ft tall holding water cannot be overcome by the pump pressure and is creating water overflowing and a leakage issues at every head unit in the building. The drain line terminations from each pump need a non-pressurized gravity reservoir or drain to spill into to prevent any back pressure of water and/or sludge buildup. Owners have eight new blue diamond maxi pumps on site and would like every pump replaced because