{"product_id":"carrier-c50a705064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A705064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A705064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A705064\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coils, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dark — the thermostat displays nothing, the system refuses to respond to any call for heating or cooling, and the unit sits completely inoperative despite having full line voltage present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM replacement | Part No. HT01BD702 | Meets original equipment electrical specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control boards. Undersized or off-tolerance generic transformers can sag under load, causing nuisance lockouts, erratic staging behavior, or premature secondary burnout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Photograph all low-voltage connections before disconnecting leads. Match wire color and terminal labeling on reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A705064\u003c\/strong\u003e commercial packaged rooftop unit using OEM part number HT01BD702. Verify your unit's data plate for voltage and VA rating before ordering to ensure a precise match. Our parts specialists are available to confirm fitment — order with confidence and get back up and running fast with same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909663838579,"sku":"CARRIE-C50A705064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909663871347,"sku":"CARRIE-C50A705064-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_311cfb1a-ded0-4e02-9b87-58bd85cc52e2.jpg?v=1782940685","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a705064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}