OEM Carrier Low Pressure Switch (7 PSI Open / 22 PSI Close) for Model PY1RPA090180ACWA — HK02ZB044

This is the genuine OEM Carrier replacement pressure switch (part number HK02ZB044) factory-specified for the Carrier PY1RPA090180ACWA packaged unit. The low pressure switch monitors refrigerant circuit pressure and protects the compressor by interrupting operation whenever suction pressure falls below a safe threshold. When this switch fails or drifts out of calibration, the system may enter a hard lockout, trip fault codes, short-cycle, or fail to cool or heat entirely — symptoms often misdiagnosed as a refrigerant leak or board failure. Replacing this switch with the correct OEM part restores factory-calibrated protection and avoids repeat callbacks.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" lead wire | SPST configuration | Factory-matched pressure tolerances for Carrier refrigerant circuits
• OEM vs Generic: This is a genuine Carrier OEM switch — factory-tested to exact cut-in/cut-out pressure specs. Generic aftermarket switches frequently carry ±15% pressure tolerances, which can allow compressor damage under low-charge conditions or cause nuisance trips under normal operation.
• Install difficulty: 2/5 — Recover refrigerant before disconnecting the pressure port to comply with EPA 608 regulations. Tools needed: manifold gauge set, adjustable wrench, flathead screwdriver, and a multimeter to confirm switch continuity before re-commissioning. Photograph all wire connections before removal.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM drop-in replacement for the Carrier PY1RPA090180ACWA packaged unit. Always verify the part number printed on the original switch label and cross-reference the system data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork, no returns.