{"product_id":"carrier-c50a304064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V-24V for C50A304064","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model C50A304064\u003c\/h1\u003e\u003cp\u003eThis OEM transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A304064\u003c\/strong\u003e commercial packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: your thermostat goes blank, relays stop responding, and the system will not start under any call for heating or cooling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01BD702 | Factory-matched for control circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Carrier transformers are wound to exact VA and voltage tolerances, protecting downstream components like the control board and contactor coil. Generic units may deliver unstable 24V output, leading to erratic operation, nuisance tripping, or premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 0V at primary leads before touching wiring. Label all low-voltage wires before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC50A304064\u003c\/strong\u003e commercial rooftop\/packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — reach out before checkout.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909692871027,"sku":"CARRIE-C50A304064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909692903795,"sku":"CARRIE-C50A304064-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_36b0f92e-3ce6-4b5e-b4d6-3c4b037a8554.jpg?v=1782939347","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a304064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}