{"product_id":"carrier-c50a502751-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A502751","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C50A502751\u003c\/h1\u003e\u003cp\u003eThis OEM transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A502751\u003c\/strong\u003e commercial packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. A failed transformer is often misdiagnosed as a control board or thermostat fault, making it an important first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM dimensions and mounting footprint | Terminal connections match factory wiring harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier maintain strict voltage regulation and VA ratings critical for protecting downstream control boards. Generic substitutes often vary in VA output, leading to nuisance tripping or premature board failure under full load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all wiring connections before removal. Verify 24V output on secondary terminals after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A502751\u003c\/strong\u003e commercial packaged rooftop unit. Always verify primary voltage and VA rating on your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909674553715,"sku":"CARRIE-C50A502751-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909674586483,"sku":"CARRIE-C50A502751-TRANSFORMER-HT01BD236-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-HT01BD236_62e18792-c093-4000-aa17-066e0eab2a9f.jpg?v=1782940580","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a502751-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}