Lochinvar & A.O. Smith 100288429 Switch R-134A technicians should verify specific pneumatic

technicians should verify specific pneumatic or electronic sensor clearance before completing the final fastener attachment

Built with a durable ABS housing and rated for operating temperatures between 40

What are the symptoms of a failing 920673A expansion valve

and mixed air control

Lochinvar & A.O. Smith 100288429 Switch R-134A technicians should verify specific pneumaticThe Lochinvar & A. O. Smith 100288429 Switch is a critical safety component designed for precise air pressure sensing in high efficiency heating systems. This OEM replacement part is factory calibrated to a 3. 90" water column (WC) set point, serving as a primary air proving switch to ensure the blower motor is moving sufficient combustion air before the ignition sequence begins. Engineered for compatibility with specific Lochinvar boilers and A. O.