OEM Carrier High Pressure Switch 448/327 PSI for Model PY1REA072115ACWA

This is the genuine OEM Carrier high pressure switch, part number HK02ZA442 (secondary part number HK02ZB044), factory-specified for the Carrier PY1REA072115ACWA packaged rooftop unit. The high pressure switch continuously monitors refrigerant-side pressure in the system and opens the safety circuit when pressure exceeds the factory set limit, protecting the compressor from catastrophic damage. When this switch fails or drifts out of calibration, you'll commonly experience nuisance high-pressure lockouts, compressor short-cycling, or a system that trips on a call for cooling and refuses to restart without a manual reset.

• Specs: 448 PSI opening pressure | 327 PSI closing pressure | OEM factory-matched setpoints | Replaces obsolete part HK02ZA439
• OEM vs Generic: Genuine Carrier Factory Authorized Parts meet exact pressure setpoint tolerances. Off-brand switches can drift ±15–20 PSI from spec, triggering false trips or — worse — failing to protect the compressor at true over-pressure events.
• Install difficulty: 3/5 — Refrigerant-side pressure switches require recovery and re-pressurization if the refrigerant circuit must be opened. Always de-energize the unit at the disconnect before servicing. Tools needed: manifold gauge set, adjustable wrench, multimeter (to confirm switch continuity), and EPA 608 certification if refrigerant handling is required.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered specifically for the Carrier PY1REA072115ACWA packaged rooftop unit. Both OEM part numbers HK02ZA442 and HK02ZB044 are covered by this listing. Verify refrigerant type and pressure setpoints on your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.