{"product_id":"carrier-c50a905064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A905064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A905064\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C50A905064\u003c\/strong\u003e commercial rooftop unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coils, and every other low-voltage control in the system. When this component fails, the entire control circuit goes dark — the thermostat loses power, the unit won't respond to any call for heating or cooling, and nothing works. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to Carrier's exact factory specifications. Generic units often use undersized copper windings that run hot under full VA load, leading to premature burnout — especially in commercial rooftop applications with multiple control loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal positions before removing the old unit. Verify 24V output with a multimeter after installation before closing the cabinet.\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 and factory-specified for the \u003cstrong\u003eCarrier C50A905064\u003c\/strong\u003e commercial packaged rooftop unit. Always confirm your unit's control voltage and VA requirements on the data plate before ordering. Our parts specialists are available to verify fitment — order with confidence today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909661282675,"sku":"CARRIE-C50A905064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909661315443,"sku":"CARRIE-C50A905064-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_ff25c028-5921-456f-8648-fbea4e5a838d.jpg?v=1782940722","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a905064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}