Carrier HK02ZA452 Pressure Switch 321702-401 While often used for proof-of-flow

While often used for proof-of-flow

this PSC motor ensures optimal airflow pressures and thermal stability

It is not rated to handle backpressure conditions

This 10 1/2" x 8" blower wheel features a 1/2" bore hub and is balanced to minimize vibration

Carrier HK02ZA452 Pressure Switch 321702-401 While often used for proof-of-flowThe 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