{"product_id":"carrier-c50a406064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A406064","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C50A406064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC50A406064\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, and safety circuits. When this component fails, the entire control circuit goes dark — thermostats go blank, contactors won't energize, and the system becomes completely unresponsive. A blown fuse on the secondary side is often the first clue this transformer has failed.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD702 | Factory-matched output for Carrier control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under peak control circuit load. Generic transformers often run undervoltage under load, causing nuisance lockouts, erratic thermostat behavior, 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, wire stripper, multimeter (verify 0V before touching secondary leads). Photograph all wiring connections before disconnecting. Check secondary fuse and wiring for shorts before installing new transformer.\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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for Carrier model \u003cstrong\u003eC50A406064\u003c\/strong\u003e commercial rooftop\/packaged units. Verify transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you order — contact us today and we'll ship it out the same day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909676093811,"sku":"CARRIE-C50A406064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909676126579,"sku":"CARRIE-C50A406064-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_a3a250da-6e15-4710-8e24-3a8a0c30aa19.jpg?v=1782940554","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a406064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}