OEM Carrier High Pressure Switch HK02ZA442 for Model PY1REA060074AAWA

This is the factory OEM high pressure switch for the Carrier PY1REA060074AAWA packaged unit. The high pressure switch (HPS) is a critical refrigerant-circuit safety device that continuously monitors discharge-line pressure. When refrigerant pressure climbs above the trip threshold — due to a dirty condenser coil, failed condenser fan motor, overcharge, or restricted airflow — the switch opens the compressor circuit, preventing catastrophic compressor damage. A failed or tripped switch typically causes a hard lockout: the system calls for cooling, the compressor contactor pulls in, and within seconds the unit shuts down on a high-pressure fault code. This OEM part (HK02ZA442) is also sold alongside the companion low pressure switch HK02ZB044, and both are commonly replaced as a protective pair on this platform.

• Specs: 448 PSI opening pressure | 327 PSI closing pressure (auto-reset) | SPST normally closed | Factory-matched to Carrier refrigerant circuit tolerances | Replaces Carrier part HK02ZA439
• OEM vs Generic: OEM pressure switches are calibrated to exact trip and reset pressures at the factory. Aftermarket alternatives frequently deviate ±10–15 PSI, risking either nuisance trips or — worse — delayed protection that allows compressor overheating. For a high-value scroll compressor platform like the PY1REA060, OEM is the correct choice.
• Install difficulty: 2/5 — Recover refrigerant charge before disconnecting the high-side pressure switch. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, and a multimeter to confirm continuity before recharge. Always verify system pressures after reinstallation.
• Warranty & Shipping: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Engineered for Carrier model PY1REA060074AAWA packaged rooftop units. Companion low pressure switch HK02ZB044 (7 PSI open / 22 PSI close, 50" leads) is available separately. Verify refrigerant type and discharge-line port size on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy.