{"product_id":"carrier-py1rpa072074acwa-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch 448#\/327# for PY1RPA072074ACWA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch (HK02ZA442) for Model PY1RPA072074ACWA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM high-pressure switch for the \u003cstrong\u003eCarrier PY1RPA072074ACWA\u003c\/strong\u003e packaged rooftop unit. Operating as the refrigerant circuit's safety sentinel, this switch monitors system discharge-side pressure and opens the control circuit when pressure exceeds a safe threshold — cutting the compressor and preventing catastrophic system damage. When it fails (open-circuit failure), the unit will typically go into a fault lockout without completing a cooling cycle, or nuisance-trip on normal operating pressure. A failed or out-of-calibration high-pressure switch is a leading cause of \"no cooling\" service calls on commercial rooftop equipment.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZA442 (High Pressure Switch):\u003c\/strong\u003e 448 PSI open \/ 327 PSI close | SPST normally-closed | Factory-calibrated setpoints | Replaces HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Part — HK02ZB044 (Low Pressure Switch):\u003c\/strong\u003e 7 PSI open \/ 22 PSI close | 50\" lead wire | Sold separately — ask our team about bundling both switches for a complete pressure-safety service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e Genuine Carrier Factory Authorized Parts are manufactured to exact setpoint tolerances. Aftermarket pressure switches frequently carry ±5–10% calibration variance, which can cause nuisance trips or — more dangerously — fail to open at true high-pressure events, risking compressor damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work. System must be isolated before disconnecting the high-side pressure switch. Tools required: manifold gauge set, 1\/4\" flare fittings, needle-nose pliers, multimeter for continuity check post-install. Recommended for certified HVAC\/R technicians. Always verify system pressure is relieved before touching fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock — ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-matched for Carrier model \u003cstrong\u003ePY1RPA072074ACWA\u003c\/strong\u003e packaged rooftop unit. This listing covers the primary high-pressure switch (HK02ZA442). Both HK02ZA442 and companion low-pressure switch HK02ZB044 are stocked and available. Verify your unit's data plate and wiring diagram before ordering — our parts specialists are available to confirm fitment. \u003cstrong\u003eOrder today and receive same-day shipping on all in-stock orders.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640629711219,"sku":"CARRIE-PY1RPA072074ACWA-PRESSURE_SWITCH-HK02ZA442","price":121.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640629743987,"sku":"CARRIE-PY1RPA072074ACWA-PRESSURE_SWITCH-HK02ZA442-GEN","price":106.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442_a4104e9c-73a0-4061-aaba-1e0679303ef2.jpg?v=1775033431","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1rpa072074acwa-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}