{"product_id":"carrier-c50a504064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A504064","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C50A504064\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C50A504064\u003c\/strong\u003e commercial rooftop unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and all safety controls. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes dark, the unit won't energize, and no staging commands are executed. It is often the first component to diagnose when facing a completely unresponsive unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched control circuit output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory specifications, ensuring stable 24V output under full control-circuit load. Generic alternatives frequently deliver undervoltage under peak demand, causing nuisance lockouts, erratic staging, and premature contactor coil failure.\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, multimeter, wire nuts or spade terminals. Verify primary and secondary voltages with a multimeter before and after replacement. Always label or photograph wiring connections prior to removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eC50A504064\u003c\/strong\u003e commercial rooftop packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909667574131,"sku":"CARRIE-C50A504064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909667606899,"sku":"CARRIE-C50A504064-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_7e653004-d24f-429c-bd40-3808cc46a5da.jpg?v=1782940629","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a504064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}