Carrier HK02ZA452 Pressure Switch 321702-401 protecting the expansion valve and

protecting the expansion valve and compressor from debris

It is not rated to handle backpressure conditions

This provides technicians with a reliable method for HVAC damper troubleshooting without needing to cycle the thermostat or use a multimeter at the motor head

this PSC motor ensures optimal airflow pressures and thermal stability

Carrier HK02ZA452 Pressure Switch 321702-401 protecting the expansion valve andThe Carrier HK02ZA452 Pressure Switch is a critical safety component designed for precise refrigerant pressure monitoring within commercial and residential HVAC systems. Engineered as a high limit safety cut out, this OEM Carrier replacement part is essential for protecting the compressor and refrigeration circuit from excessive pressure conditions. With a fixed cut out setting of 426 PSI and a cut in reset at 320 PSI, it ensures the system operates