you should adjust the air pressure to match your boiler fill valve setting (typically 12–15 PSI) while the tank is empty or isolated from system pressure

apply the rated 0

Built with a durable bimetallic disc for precise thermal response

maintaining precise valve positioning and shut-off capability

With a 24V coil rating and 1/10 HP capacity

Carrier 00PPG000492100A Pressure Switch 30067439-890 you should adjust the airThe Carrier 00PPG000492100A Pressure Switch is a mission critical OEM replacement part designed for precision pressure monitoring within Carrier, Bryant, and Payne HVAC systems. This switch is calibrated for a 160 In cut in and 204 Out cut out profile, ensuring the inducer motor or refrigerant circuit maintains exact operational safety limits. As the direct cross reference for the obsolete 00PPG000453600A and a replacement for HK02ZA440, it offers