McDonnell & Miller 354083 Short Probe Els PW 17895 The Lennox 81L75 Control Board

The Lennox 81L75 Control Board is a critical OEM component designed for precise fan speed regulation and airflow management in residential and light commercial HVAC systems

This "switching package" facilitates the controlled operation of critical furnace components

With its non-primary aeration design and 1/4-inch compression fitting

For mid-to-large scale commercial refrigeration and AC systems

McDonnell & Miller 354083 Short Probe Els PW 17895 The Lennox 81L75 Control BoardThe McDonnell & Miller 354083 (Model PA RB 122) is a 3 4" NPT replacement short probe designed specifically for the RB 122 series low water cut off (LWCO). This OEM replacement part is essential for maintaining the integrity of hydronic boiler systems. It features a self cleaning tip engineered to reduce mineral scale buildup, ensuring consistent signal conductivity and preventing nuisance boiler shutdowns. When replacing a fouled or damaged probe,