{"product_id":"carrier-tfaccy50dk480418-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch 448#\/327# for TFACCY50DK480418","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 448#\/327# — HK02ZA442 for Model TFACCY50DK480418\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e), the factory-specified replacement for Carrier model \u003cstrong\u003eTFACCY50DK480418\u003c\/strong\u003e packaged and commercial HVAC equipment. The high pressure switch continuously monitors refrigerant circuit pressure on the high side; when pressure exceeds the \u003cstrong\u003e448 PSI opening threshold\u003c\/strong\u003e, the switch trips and shuts down the compressor to prevent catastrophic equipment damage. The system re-enables operation once pressure drops back to the \u003cstrong\u003e327 PSI closing setpoint\u003c\/strong\u003e. 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Opening pressure: 448# (PSI) | Closing pressure: 327# (PSI) | 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, 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — 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.\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 Engineered as a direct OEM drop-in replacement for Carrier model \u003cstrong\u003eTFACCY50DK480418\u003c\/strong\u003e. 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.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640258515315,"sku":"CARRIE-TFACCY50DK480418-PRESSURE_SWITCH-HK02ZA442","price":150.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640258548083,"sku":"CARRIE-TFACCY50DK480418-PRESSURE_SWITCH-HK02ZA442-GEN","price":132.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442_ccdaa500-812f-4de9-a641-9e4b4caff5f9.jpg?v=1775033434","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tfaccy50dk480418-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}