To correctly seat the probe and flange

restoring normal furnace operation without manual intervention

which allows for internal servicing or diaphragm replacement without pumping down the system or breaking pipe connections

Engineered to meet strict HVAC electrical component standards

ensure the piping is adequately supported to prevent stress on the 1/2" connection due to the weight of the water-filled tank

MARS 33420 Tstat 320819-301 To correctly seat the probeThe MARS 33420 is a high performance commercial refrigeration thermostat designed for precision temperature control in demanding environments. This SPST fan delay thermostat features a fixed 35F open and 55F close configuration, making it an essential component for defrost termination and evaporator fan motor control. Built with a 1 inch fully encapsulated disc, this Klixon style switch ensures moisture resistant operation and long term reliability in