Engineered to meet strict HVAC electrical component standards

extending the interval between filter change-outs and reducing labor costs

restoring normal furnace operation without manual intervention

To correctly seat the probe and flange

set your multimeter to the microamp (µA) scale and connect it in series between the flame sensor and the control module

MARS 33420 Tstat 320819-301 Engineered to meet strict HVACThe 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