OEM Carrier High Pressure Switch 448#/327# — HK02ZA442 for Model TFACCY50DK480418

This is the genuine OEM Carrier high pressure switch (part number HK02ZA442), the factory-specified replacement for Carrier model TFACCY50DK480418 packaged and commercial HVAC equipment. The high pressure switch continuously monitors refrigerant circuit pressure on the high side; when pressure exceeds the 448 PSI opening threshold, the switch trips and shuts down the compressor to prevent catastrophic equipment damage. The system re-enables operation once pressure drops back to the 327 PSI closing setpoint. Common failure symptoms include nuisance high-pressure lockouts, compressor short-cycling, or a fault code indicating a high-pressure trip that cannot be reset — all signs this switch may have drifted out of calibration or failed outright.

• Specs: Opening pressure: 448# (PSI) | Closing pressure: 327# (PSI) | Voltage: 240V | OEM Part #: HK02ZA442 | Replaces: HK02ZA439
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, precision-calibrated to exact setpoints. Off-brand alternatives often use looser pressure tolerances that can allow over-pressure events to go undetected, risking compressor failure and voiding system warranties.
• Install difficulty: 3/5 — Requires proper refrigerant circuit safety procedures. Recover system refrigerant before disconnecting the switch. Tools needed: manifold gauge set, flare-nut wrenches, multimeter for continuity verification. Always confirm pressure setpoints match your unit's data plate before installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM drop-in replacement for Carrier model TFACCY50DK480418. Always verify the opening/closing pressure ratings on your unit's data plate or service manual before ordering to confirm this switch matches your application. Have a question about fitment? Our HVAC parts specialists verify compatibility before you order — contact us today and get your system back up and running fast.