Carrier HK02ZB309 Pressure Switch 320788-702 Subsituting a higher temperature switch

Subsituting a higher temperature switch poses a significant safety risk

it integrates seamlessly into existing wiring harnesses on compatible American Standard and Trane furnaces

What is the difference between this and the older 300SMA11 model

steam safety valves are factory set and sealed to comply with National Board requirements

Optimized Performance: Sustained 1150 RPM output ensures consistent CFM delivery across the coil

Carrier HK02ZB309 Pressure Switch 320788-702 Subsituting a higher temperature switchThe Carrier HK02ZB309 Pressure Switch is a critical OEM replacement part designed for high pressure monitoring in Carrier, Bryant, and Payne HVAC systems. This vapor pressure switch features precise factory set trip points, with an open pressure of 384 PSI and a close pressure of 309 PSI. Engineered for Puron (R 410A) units, it maintains system integrity by preventing hazardous overpressure events and ensuring the compressor operates within safe