Lochinvar & A.O. Smith 100208391 Pressure Switch 340155-7024 The "R" in the QL171R-06-06

The "R" in the QL171R-06-06 model number indicates that the service port is located on the right side when looking directly into the field connection

High discharge pressure typically triggers this switch

While it follows the manufacturer’s factory defaults for its primary application series

Optimized Performance: Specifically designed for the 8221 series AC series to ensure perfect fitment and restore original flow control specifications

Broad Application Range: Fits numerous Modine unit heaters

Lochinvar & A.O. Smith 100208391 Pressure Switch 340155-7024 The "R" in the QL171R-06-06The Lochinvar & A. O. Smith 100208391 Pressure Switch is a mission critical safety component designed for precise pressure monitoring within high efficiency boilers and water heaters. Engineered to meet rigorous OEM specifications, this 0. 21" W. C. air pressure switch functions as a blower prover, ensuring the combustion blower is generating sufficient airflow before allowing the ignition sequence to proceed. By supervising the differential pressure