OEM Carrier High Pressure Switch 448/327 PSI for Model PY1RPA048115AAWA

This is the genuine OEM Carrier high pressure switch (part number HK02ZA442) factory-specified for the Carrier PY1RPA048115AAWA packaged rooftop unit. The high pressure switch is a critical refrigerant-circuit safety device that continuously monitors system discharge pressure. When refrigerant pressure exceeds the safe operating threshold, the switch opens the control circuit, shutting down the compressor to prevent catastrophic damage. A failed or weak pressure switch typically causes nuisance high-pressure lockouts, compressor short-cycling, or a system that trips on high pressure even under normal operating conditions — symptoms that are often misdiagnosed as refrigerant or compressor issues.

• Specs: Opens at 448 PSI | Closes at 327 PSI | Rated 6(6)A | Replaces superseded part HK02ZA439 | Factory Authorized Part (FAP) — meets exact Carrier Corporation specifications
• OEM vs Generic: Factory Authorized OEM switches are calibrated to exact trip-point tolerances, ensuring the compressor shuts off at precisely 448 PSI. Generic substitutes often carry wider tolerances, risking compressor overload or premature nuisance trips that degrade system reliability.
• Install difficulty: 2/5 — Recover refrigerant and de-energize the unit before replacing. Tools needed: 1/4" and 3/8" flare wrenches, multimeter (to confirm switch continuity), and refrigerant manifold gauges. Always leak-check the new switch connection before recharging.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from NationalHVACParts.com warehouse. Also includes secondary part number HK02ZB044 for cross-reference verification.

Compatibility: Engineered as a direct drop-in replacement for Carrier model PY1RPA048115AAWA packaged rooftop units. Verify discharge line connection size and pressure ratings on your unit data plate before ordering. Need fitment help? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.