Technicians should utilize this module when diagnosing irregular fan cycling or failures in the blower relay circuit to restore factory-specified environmental control and airflow timing within the air stream

ensuring that the unit responds correctly to thermostat staging demands

while BRG0740 is the legacy reference often found in older service manuals and unit nameplates

Is the 20046601S a drop-in replacement for the 10219801

this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions

Lochinvar & A.O. Smith 100289391 Pressure Switch 30067439-890 Technicians should utilize this moduleThe Lochinvar & A. O. Smith 100289391 Pressure Switch is a critical safety component engineered for high efficiency condensing water heaters and commercial boilers. Calibrated to a 0. 55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing