Carrier HK02ZA404 Pressure Switch

The Carrier HK02ZA404 is a vital OEM high pressure switch designed specifically for Carrier, Bryant, and Payne HVAC and refrigeration systems. This factory authorized part is engineered to safeguard the compressor and refrigeration cycle by monitoring internal pressures and opening the electrical circuit when limits are reached. The switch features a 650 PSI cutout and a 420 PSI cut-in reset point, ensuring the system operates within safe mechanical parameters. Built for durability in demanding environments, it utilizes a normally open (NO) contact configuration and reliable 2-pin screw terminals for secure electrical termination. This high pressure switch replacement is an essential component for maintaining the integrity of the coolant loop, preventing terminal failure due to excessive head pressure or airflow restrictions. For field technicians, the HK02ZA404 pressure control provides a precise, calibrated response to help reduce troubleshooting time and prevent costly secondary component damage during high-load periods.

• Precise Pressure Calibration: Pre-set with a 650# cutout and 420# cut-in to ensure automatic protection and system recovery.
• Genuine OEM Reliability: A Carrier Factory Authorized Part ensures exact fitment and performance matching for Carrier 50VG and compatible heat pump or AC units.
• Robust Construction: Features an IP65 enclosure rating to resist moisture and dust ingress, common in outdoor condenser applications.
• Simplified Serviceability: The compact design and screw terminal connections allow for efficient installation in tight control boxes.

• What causes a high pressure switch to trip in a Carrier unit? Frequent trips are often caused by dirty condenser coils, a failing outdoor fan motor, or an overcharged system, leading the HK02ZA404 to open at 650 PSI to protect the compressor.
• Is the HK02ZA404 a manual or automatic reset switch? This specific model is an automatic reset pressure switch, meaning it will re-close the circuit once the pressure drops back down to the 420 PSI cut-in threshold.
• Can this be used with R-410A refrigeration systems? Yes, the 650 PSI rating is specifically designed to handle the higher operating pressures associated with R-410A refrigerant systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.