{"product_id":"carrier-py1rea048115aawa-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch HK02ZA442 — PY1REA048115AAWA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model PY1REA048115AAWA\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e) is the factory-specified refrigerant-side safety control for the \u003cstrong\u003eCarrier PY1REA048115AAWA\u003c\/strong\u003e packaged rooftop unit. Mounted in the high-side refrigerant circuit, it monitors discharge pressure and trips the compressor circuit open when pressure exceeds safe operating limits — protecting the compressor from catastrophic damage due to overcharge, condenser fouling, or blocked airflow. A failed or out-of-calibration pressure switch causes nuisance high-pressure lockouts, failure to cool, or a system that short-cycles and trips on repeated fault codes. This listing also covers the companion low-pressure switch \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e (7#OPN \/ 22#CLS, 50\" lead), sold separately — confirm your fault code to order the correct switch.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e HK02ZA442 (High Pressure Switch — primary) | HK02ZB044 (Low Pressure Switch — companion) | Replaces legacy part HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZA442:\u003c\/strong\u003e 448 PSI opening pressure | 327 PSI closing pressure | SPST normally closed | Factory Authorized Part — meets exact Carrier engineering tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to precise trip points at the factory. Aftermarket substitutes frequently deviate by ±10–15 PSI, risking either nuisance trips that reduce runtime or, worse, insufficient compressor protection that leads to premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires EPA 608 certification. Recover refrigerant before disconnecting the high-side port. Tools needed: manifold gauge set, 1\/4\" flare fittings, wire terminals, multimeter. Verify continuity of replacement switch before recharging system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3 PM local time ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-matched for the Carrier \u003cstrong\u003ePY1REA048115AAWA\u003c\/strong\u003e packaged rooftop unit (4-ton, 115,000 BTU gas heat). Always cross-reference the data plate part number before ordering. Our technical team is available to verify fitment — contact us before you buy if you have any doubt.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640741613939,"sku":"CARRIE-PY1REA048115AAWA-PRESSURE_SWITCH-HK02ZA442","price":121.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640741646707,"sku":"CARRIE-PY1REA048115AAWA-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_70a5b6f2-f071-4495-8913-cfc04df53a23.jpg?v=1775033648","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1rea048115aawa-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}