Carrier HK02ZA451 Pressure Switch

The Carrier HK02ZA451 Pressure Switch is an essential OEM replacement component engineered for high-accuracy pressure monitoring in commercial and residential HVACR systems. As a veteran-grade HVAC pressure controller, this unit features a pressure range of 5-100 PSIG and a field-adjustable differential range of 3-12 PSI, allowing technicians to fine-tune system cut-in and cut-out points with professional precision. The integrated manual reset button provides a critical safety layer, preventing automatic equipment restarts after a high-pressure trip, which is vital for protecting compressors and internal circuitry. Constructed with a rugged housing and a sensitive diaphragm, the HK02ZA451 is compatible with air handlers, chillers, and hydraulic process machinery. Electrical ratings of 15 A at 120 VAC and 10 A at 240 VAC ensure seamless integration with existing control boards and contactors, maintaining strict operational safety and UL/CSA certified reliability in demanding environments.

Item is Non Cancelable / Non Returnable

• Precise Pressure Regulation: Features a wide 5-100 PSIG operational range for versatile application in various industrial and HVAC settings.
• System Protection: The manual reset mechanism ensures a technician inspects the system before resuming operation, preventing repetitive cycling and potential hardware damage.
• OEM Compatibility: Designed as a direct drop-in replacement for Carrier, Bryant, and Day & Night equipment to ensure factory-spec performance.
• Heavy-Duty Electrical Rating: Capable of handling up to 15 Amps, making it suitable for direct-wired fans, pumps, and compressor control circuits.

What is the set point and differential for this switch?
The HK02ZA451 is adjustable between 5 and 100 PSIG, with a variable differential adjustment between 3 and 12 PSI to accommodate specific system requirements.

Does this switch reset automatically?
No, this specific model is a manual reset switch. If the pressure exceeds the high-limit threshold, the switch must be manually depressed by a technician after the fault is cleared.

Can this be used on refrigeration rack systems?
Yes, provided the pressure and electrical requirements align. It is frequently employed in process control and refrigeration applications where manual intervention is required for safety protocols.

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.