{"product_id":"carrier-py1rpa048115aawb-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch 448#OPN\/327#CLS — PY1RPA048115AAWB","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model PY1RPA048115AAWB\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e, with companion low pressure switch \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY1RPA048115AAWB\u003c\/strong\u003e packaged rooftop unit. The high pressure switch continuously monitors refrigerant pressure on the high side of the refrigeration circuit. When discharge pressure exceeds the trip point, the switch opens to cut power to the compressor, protecting it from catastrophic damage. Common failure symptoms include nuisance lockouts, compressor short-cycling, or a system that trips on high pressure fault codes even when refrigerant charge and airflow appear normal — often indicating a faulty switch rather than a true over-pressure condition.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZA442 (High Pressure Switch):\u003c\/strong\u003e Opens at 448 PSI | Closes at 327 PSI | Factory-calibrated trip point | Replaces HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZB044 (Low Pressure Switch):\u003c\/strong\u003e Opens at 7 PSI | Closes at 22 PSI | 50\" lead wires | 24V control circuit rated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches are calibrated to exact factory trip-point tolerances, critical for proper compressor protection. Aftermarket switches often carry wider pressure tolerances that can allow nuisance trips or, worse, fail to protect the compressor at true over-pressure events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Recover refrigerant before replacing any refrigerant-side pressure switch. Tools needed: manifold gauges, 1\/4\" flare wrench, multimeter for continuity verification. Always confirm wiring polarity and lead routing before reconnecting. Nitrogen-pressure-test the port fitting before recharging.\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 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Carrier model \u003cstrong\u003ePY1RPA048115AAWB\u003c\/strong\u003e packaged rooftop unit. Both OEM part numbers — HK02ZA442 (high pressure) and HK02ZB044 (low pressure) — are available individually or as a set. Verify the failed switch type (high vs. low side) using your unit's wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — add to cart or call us today. \u003cstrong\u003eIn stock — ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640656843123,"sku":"CARRIE-PY1RPA048115AAWB-PRESSURE_SWITCH-HK02ZA442","price":131.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640656875891,"sku":"CARRIE-PY1RPA048115AAWB-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_45b46b9e-aefc-4403-8583-fe55191db0cd.jpg?v=1775033448","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1rpa048115aawb-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}