For technicians performing system upgrades or HVAC control board repairs

Designed for heavy-duty service in potable water systems

extending the service life of the motor in harsh outdoor conditions

or the control board failing to sense correct blower tachometer signals

Lochinvar & A.O. Smith 100224394 Pressure Switch 320819-301 For technicians performing system upgradesThe Lochinvar & A. O. Smith 100224394 Pressure Switch is a critical safety component designed for high efficiency water heaters and HVAC systems. This air pressure switch is factory calibrated to a 1. 66" WC (Water Column) setpoint and features a Normally Closed (N. C.) contact configuration. As an essential part of the combustion blower assembly, this OEM replacement part monitors the negative pressure generated by the inducer fan to ensure proper