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This model meets NEC Class 2 "not wet" and Class 3 "wet" requirements
this differential air pressure switch monitors draft inducer performance to ensure proper combustion airflow before ignition
the ECM control module is likely the culprit
What is the maximum supply pressure allowed for this unit
Markel ET9STS Stat 326010-701 This model meets NEC ClassThe Markel ET9STS is a heavy duty line voltage thermostat engineered specifically for high capacity heat only applications. Built with a single pole single throw (SPST) snap action switch, this industrial heating control is rated for 22 Amps at 120 277V resistive loads, making it a reliable choice for direct connection to baseboard heaters, fan forced unit heaters, and radiant heating elements. The bimetal actuator provides a consistent 2 degree
