{"product_id":"carrier-c50a202764-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A202764","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C50A202764\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A202764\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, absolutely nothing responds: the thermostat goes blank, no calls for heat or cooling are processed, and the system appears completely dead despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD702 | Factory-matched output tolerance for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight secondary voltage regulation under varying load conditions. Off-brand units frequently deliver unstable 24V output, causing erratic board behavior, nuisance lockouts, and premature failure of downstream components like contactors and gas valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify with a multimeter before handling. Tools needed: flathead and Phillips screwdriver, wire stripper, multimeter. Label and photograph all low-voltage wiring connections before removal. Secure all wire nuts firmly after reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A202764\u003c\/strong\u003e commercial packaged rooftop unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. If your unit runs a 208\/240V primary, a different transformer part number is required — contact our team for fitment verification before purchasing.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909714399603,"sku":"CARRIE-C50A202764-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909714432371,"sku":"CARRIE-C50A202764-TRANSFORMER-HT01BD702-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD702_3bd59d62-80c4-43c9-8585-99ca756a545b.jpg?v=1782940341","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a202764-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}