we service a large chain on stores similiar to cvs in south fl. they are changing units to new trane package units well the installation company ???? is installing a regular float switch on the drain line. and additionally installing another water level sensor clip to the drain pan, with a probe sensing the water. not sure of the brand but its white with like a bull dog in the picture. its something like guard dog. the issue that im seeing is that once they get the slightest moisture blown on the probe it shuts the unit down doing its job. with the pan and drain clean/clear. my question is anyone seeing these things. or maybe they are for residential applications maybe commercial has to much turbulance in the evap section??????? loooking to hear others experience.