{"product_id":"carrier-py1rpa036074abwb-pressure-switch-jri7yl","title":"OEM Carrier High \u0026 Low Pressure Switch Kit HK02ZA442 + HK02ZB044 — PY1","description":"\u003ch1\u003eOEM Carrier High \u0026amp; Low Pressure Switch Kit (HK02ZA442 + HK02ZB044) for Model PY1RPA036074ABWB\u003c\/h1\u003e\u003cp\u003eThis factory-matched OEM pressure switch kit includes both the \u003cstrong\u003ehigh pressure switch (HK02ZA442)\u003c\/strong\u003e and the \u003cstrong\u003elow pressure switch (HK02ZB044)\u003c\/strong\u003e — the two refrigerant circuit safety switches specified for the \u003cstrong\u003eCarrier PY1RPA036074ABWB\u003c\/strong\u003e packaged heat pump unit. Together, these switches monitor refrigerant pressure on the high and low sides of the refrigerant circuit and shut the compressor down before a damaging over- or under-pressure condition can occur. Symptoms of failure include system lockout with a pressure fault code, compressor short-cycling, nuisance trips on a hot day, or a unit that won't cool despite the thermostat calling. Replacing both switches at the same service call eliminates repeat trips and ensures both safety circuits are factory-calibrated.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZA442 (High Pressure):\u003c\/strong\u003e 448 PSI open \/ 327 PSI close | SPST N.C. | Factory Authorized Part | Replaces HK02ZA439\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs — HK02ZB044 (Low Pressure):\u003c\/strong\u003e 7 PSI open \/ 22 PSI close | 50\" lead wires | 24V | SPST N.C. | OEM Carrier\/Bryant\/Payne\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM switches hold exact factory trip points. Off-brand units can drift ±10–15% on setpoints, risking compressor damage from unchecked high-side pressure or running the system in a low-charge condition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Recover refrigerant charge before disconnecting high-side switch per EPA 608 regulations. Tools needed: manifold gauge set, recovery machine, torque wrench, wire crimpers, multimeter. Always confirm replacement trip points match the unit's data plate before re-commissioning. Low-side switch can often be swapped on low-pressure side with minimal refrigerant loss using a Schrader valve core tool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both parts. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier PY1RPA036074ABWB\u003c\/strong\u003e packaged rooftop\/heat pump unit. Verify both part numbers against your unit's wiring diagram and service literature before ordering. Not sure which switch failed? Our HVAC-certified team can help you confirm fitment and diagnose by fault code — contact us before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640666444147,"sku":"CARRIE-PY1RPA036074ABWB-PRESSURE_SWITCH-HK02ZA442","price":221.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640666476915,"sku":"CARRIE-PY1RPA036074ABWB-PRESSURE_SWITCH-HK02ZA442-GEN","price":194.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442.jpg?v=1775033173","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1rpa036074abwb-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}