{"product_id":"carrier-c48a702764-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V-24V for C48A702764","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A702764\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A702764\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V required by your thermostat, contactor coils, and all control circuit components. When this transformer fails, the entire control circuit loses power — your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and nothing runs. It is often the first component to check when a unit is completely unresponsive despite having line voltage present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Direct plug-in or screw-terminal mount | Factory-matched impedance for stable 24V output under full control circuit load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and impedance specifications. Undersized or off-spec generic transformers can sag under load, causing erratic thermostat behavior, nuisance tripping of the secondary fuse, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph and label all wiring connections before disconnecting the old transformer. Verify 24V output at secondary terminals before restoring full operation.\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 specifically for the \u003cstrong\u003eCarrier C48A702764\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and voltage markings on the unit data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909723935091,"sku":"CARRIE-C48A702764-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909723967859,"sku":"CARRIE-C48A702764-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_1cc64ebd-04b1-4959-ab33-5bb17e22cb0b.jpg?v=1782939320","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a702764-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}