{"product_id":"carrier-c50a403064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A403064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A403064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A403064\u003c\/strong\u003e commercial packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coils, and control board. When this transformer fails, the system goes completely unresponsive: a blank thermostat, no contactor pull-in, and no heating or cooling operation whatsoever. It is often the first component to check when a system appears totally dead despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output rating | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD702 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance tolerances for the C50A403064 control circuit. Off-brand replacements often under-deliver VA capacity, causing nuisance trips, control board brownouts, and premature failure of downstream low-voltage components.\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, wire nuts or terminal connectors. Verify 0V at primary terminals with a meter before touching wiring. Label or photograph all control wiring connections prior to removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3 PM local time ship same business day from our climate-controlled parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A403064\u003c\/strong\u003e commercial packaged rooftop unit. Confirm 120V primary supply voltage and 40VA minimum load requirement on your unit's wiring diagram before ordering. If your system uses a 208V or 240V primary input, do not install this transformer — consult your unit's data plate. Our parts specialists are available to verify fitment before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909681926515,"sku":"CARRIE-C50A403064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909681959283,"sku":"CARRIE-C50A403064-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_220e5dd7-c458-4bcb-ac5e-dc06dc8b67ce.jpg?v=1782940515","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a403064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}