AboutJ Cook Expertise With 25+ years experience, I am familiar with residential, commercial, and industrial HVAC equipment including but not limited to boilers, chillers, reciprocating and screw compressors. I am trained in all manners of control wiring.
Experience I currently have three HVAC licenses and Refrigeration license by the State of North Carolina. I have been in this field for over twenty years. I have been a service technician for a contractor and also worked at a state college in the repair and maintenance of steam lines and equipment. I am currently the Building Maintenance Superintendent for a municipality.
Question how do i install a safety switch for air handler drain pan? It is a model j-100 with a styrofoam floating device. it also has to yellow wires. not for sure if unit is 110v or 220. thanks for your time
Answer This switch connects in the control circuit, 24 volts. Open the fan section and locate the thermostat terminal board. There will be a Y terminal. This energizes the compressor. Remove the wire from the Y terminal, extend it to one of the drain pan switch wire, connect another wire to the other switch wire and connect it back to the Y terminal. This way if the pan fills, the compressor will be shut down preventing any more condensation from forming until the drain pan is cleaned. Thanks J
