OEM Carrier High Pressure Switch 448/327# for Model TFACCY50DK480427

This genuine OEM Carrier high pressure switch (part #HK02ZA442) is the factory-specified replacement for the Carrier TFACCY50DK480427 packaged unit. The high pressure switch continuously monitors refrigerant-side pressure and opens the circuit when system pressure exceeds safe operating limits. When this switch fails or trips, the system may experience nuisance lockouts, short-cycling, or a complete no-cooling condition — even when refrigerant charge and airflow are normal. A faulty switch that won't reset is a clear sign it's time to replace.

• Specs: Opening pressure: 448 PSI | Closing (reset) pressure: 327 PSI | Operating voltage: 240V | OEM Part #: HK02ZA442 | Replaces: HK02ZA439
• OEM vs Generic: This is a genuine Carrier factory-authorized part with exact pressure calibration. Aftermarket switches often carry wider tolerances, risking premature trips or, worse, failure to open — putting compressors and system components at risk.
• Install difficulty: 2/5 — Always recover refrigerant per EPA Section 608 before disconnecting the switch. Tools needed: refrigerant recovery unit, manifold gauge set, adjustable wrench, multimeter. Verify the circuit is de-energized before handling. Photograph wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier TFACCY50DK480427 packaged HVAC unit. Cross-references with internal switch code 448-327# and replaces superseded part number HK02ZA439. Always verify your unit's nameplate pressure ratings before ordering. Our team is available to confirm fitment — contact us before you order if you have any questions.