Carrier HK02SA445 Pressure Switch

The Carrier HK02SA445 is a critical OEM high-pressure safety switch designed for precise refrigerant circuit monitoring in residential and commercial condensing units. This high pressure switch is factory-calibrated with a 660 PSI cutout and a 505 PSI cut-in (reset) threshold, ensuring the compressor remains protected against thermal overload and mechanical failure during extreme head pressure conditions. As a genuine Carrier replacement part, it offers a direct-fit solution for field service technicians, maintaining the integrity of the original system engineering without the need for additional modifications.

Constructed for durability in demanding environments, the HK02SA445 pressure switch features a compact footprint and reliable electrical contacts for stable signaling to the control board. It is compatible with a wide range of R-410A systems, including Carrier, Bryant, and Payne models within the 48HCFD and 50TCQD series. Integrating this HVAC high pressure control helps prevent costly compressor burnouts and ensures the system operates within safe thermodynamic limits.

• Precise Pressure Calibration: Accurate 660 PSI open and 505 PSI close points provide reliable protection against refrigerant overpressure.
• OEM Direct-Fit Replacement: Ensures seamless mechanical and electrical compatibility with factory specifications in Carrier-brand equipment.
• Enhanced System Safety: Actively monitors high-side discharge pressure to prevent catastrophic hardware damage during restricted airflow or fan motor failure.
• Industrial-Grade Reliability: Built with robust materials to withstand the frequent pressure cycling and temperature fluctuations common in HVACR applications.

What are the specific pressure ratings for the HK02SA445?
This switch is rated for a 660 PSI cutout, meaning it will open the circuit to stop the compressor if high-side pressure exceeds this limit. The 505 PSI reset (cut-in) point allows the system to resume operation once the pressure has safely equalized.

Is the HK02SA445 compatible with R-22 systems?
No, this switch is specifically calibrated for the higher operating pressures of R-410A refrigerant. Using it in R-22 equipment would result in improper safety thresholds and potential equipment damage.

Can this pressure switch be used on Bryant or Payne units?
Yes, as a factory-authorized part, it is a cross-compatible replacement for many Bryant and Payne models that share the same engineering platform as Carrier equipment.

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.