{"product_id":"carrier-c50a703064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A703064","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C50A703064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC50A703064\u003c\/strong\u003e commercial packaged unit. The transformer steps down 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 the transformer fails, the entire control system goes dark: the thermostat goes blank, the unit becomes completely unresponsive, and nothing operates. A blown fuse on the secondary side is often the first clue the transformer has shorted or been overloaded.\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 output for stable low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer delivers precise 24V output within factory tolerance. Generic alternatives frequently run high or low on secondary voltage, causing erratic thermostat behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or push connectors. Always photograph or label existing wiring before disconnecting. Test secondary output voltage 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\u003eC50A703064\u003c\/strong\u003e commercial rooftop\/packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram inside the unit's control access panel before ordering. Our fitment team is available to confirm compatibility before you buy — ships today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909664330099,"sku":"CARRIE-C50A703064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909664362867,"sku":"CARRIE-C50A703064-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_14f424f2-5328-4ca8-bf9f-821c87d4b817.jpg?v=1782940677","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a703064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}