{"product_id":"carrier-tfaccy50dk480427-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch 448\/327# — TFACCY50DK480427","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 448\/327# for Model TFACCY50DK480427\u003c\/h1\u003e\u003cp\u003eThis genuine OEM Carrier high pressure switch (part #HK02ZA442) is the factory-specified replacement for the \u003cstrong\u003eCarrier TFACCY50DK480427\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Opening pressure: 448 PSI | Closing (reset) pressure: 327 PSI | Operating voltage: 240V | OEM Part #: HK02ZA442 | Replaces: HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the \u003cstrong\u003eCarrier TFACCY50DK480427\u003c\/strong\u003e 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 Cross-references with internal switch code 448-327# and replaces superseded part number HK02ZA439.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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640257859955,"sku":"CARRIE-TFACCY50DK480427-PRESSURE_SWITCH-HK02ZA442","price":105.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640257892723,"sku":"CARRIE-TFACCY50DK480427-PRESSURE_SWITCH-HK02ZA442-GEN","price":93.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442_a3e6e634-8301-4156-a0c5-669ce44a020c.jpg?v=1775033473","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tfaccy50dk480427-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}