Return to clogged drain line and float switch engaged. This was not allowing the unit to come on and cool. I redid the primary drain line to have more significant slope for drainage and also added a T to allow the client to service the drain line as well. Before departure the float switch engaged again but I ensured the primary was free by pouring more there than 64oz of water. I then relocated the float switch in line to only engage if the primary drain line gets clogged. The unit is cooling on departure.