or the control board failing to sense correct blower tachometer signals

This non-relay type thermostat operates with a direct acting control signal

Use this kit to maintain the modulating discharge characteristics critical for process equipment sensitive to temperature fluctuations

always verify your unit's serial and model number against the technical manual

High Flow Capacity: Supports up to 295

Lochinvar & A.O. Smith 100224394 Pressure Switch 320819-301 or the control board failingThe 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