the 327972-756 features a manifold kit rated for up to 155

making it suitable for large-scale commercial boilers and heaters

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

Cross-reference your unit's model number (e

Lochinvar & A.O. Smith 100289391 Pressure Switch 30067439-890 the 327972-756 features a manifoldThe 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