Have 4 AERO DX Coils that we installed a few years ago for ammonia a design problem occurred when ordering the coils and have been dealing with it ever since. The tube Dia is to large and the coils Brine a lot. The suction line comes out of the bottom of the coil and runs vertically up to the roof about 4 meters. Can these coils become oil logged and what would be a good way to check if this is the case there is no service drain v/v on the coil