{"product_id":"carrier-tfaccy50dk480311-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch 448#OPN 327#CLS — TFACCY50DK480311","description":"\u003ch1\u003eOEM Carrier High Pressure Switch 448#OPN \/ 327#CLS for Model TFACCY50DK480311\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM factory-replacement high pressure switch for the \u003cstrong\u003eCarrier TFACCY50DK480311\u003c\/strong\u003e commercial packaged\/rooftop unit. The high pressure switch (HK02ZA442) is a critical refrigerant-side safety device that monitors refrigerant circuit pressure and opens the circuit when pressure exceeds the safe threshold — protecting the compressor from catastrophic damage. When this switch fails or trips due to age, vibration, or refrigerant overcharge, you'll typically experience nuisance high-pressure lockouts, compressor short-cycling, or a system that trips on manual reset repeatedly without an apparent refrigerant-side fault. A second OEM switch, HK02ZB044, serves as the low pressure switch on this platform (7#OPN \/ 22#CLS, 50\" leads) and is also stocked for this model.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs (HK02ZA442 — High Pressure Switch):\u003c\/strong\u003e 448 PSI opening pressure | 327 PSI closing pressure | OEM factory-matched setpoints | Replaces HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs (HK02ZB044 — Low Pressure Switch):\u003c\/strong\u003e 7 PSI opening pressure | 22 PSI closing pressure | 50\" leads | 24V | Country of Origin: Mexico\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e Genuine Carrier OEM switches are calibrated to exact factory pressure setpoints (±tolerance), ensuring no nuisance trips and full compressor protection. Aftermarket switches often drift from spec, risking either unprotected operation or false lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Requires refrigerant-side work. Always recover refrigerant per EPA Section 608 before replacing. Tools needed: manifold gauges, refrigerant recovery unit, 1\/4\" flare fittings, multimeter. Verify system pressures are within normal range before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as the direct OEM replacement for \u003cstrong\u003eCarrier TFACCY50DK480311\u003c\/strong\u003e. Both OEM part numbers — \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e (high pressure, primary) and \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e (low pressure, secondary) — are in stock. Always verify pressure setpoints on your unit's data plate and wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and we'll ship your order out fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640259432819,"sku":"CARRIE-TFACCY50DK480311-PRESSURE_SWITCH-HK02ZA442","price":131.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640259465587,"sku":"CARRIE-TFACCY50DK480311-PRESSURE_SWITCH-HK02ZA442-GEN","price":115.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442_208b85b2-08c4-4d0f-8648-fcf743b02a8c.jpg?v=1775033443","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tfaccy50dk480311-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}