{"product_id":"carrier-c4850c50zn075610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZN075610 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C50ZN075610\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZN075610\u003c\/strong\u003e 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 this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the system won't call for heating or cooling, and a multimeter check of the secondary winding will show zero voltage output. Replacing the transformer is one of the quickest ways to restore a completely unresponsive system.\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 HT01BD236 | Factory-matched winding and mounting configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and potted to Carrier's exact VA rating and thermal protection specs. Generic transformers frequently run underrated VA, which can cause overheating, nuisance tripping, or premature failure when multiple 24V accessories are on the circuit simultaneously.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to confirm 24V output after install. Label or photograph existing wiring before disconnecting primary and secondary leads.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50ZN075610\u003c\/strong\u003e packaged unit. Always verify primary voltage (120V), secondary voltage (24V), and VA rating on your unit's wiring diagram or data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — so you order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909769646451,"sku":"CARRIE-C4850C50ZN075610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909769679219,"sku":"CARRIE-C4850C50ZN075610-TRANSFORMER-HT01BD236-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-HT01BD236_d590eb25-91ae-4f65-8d32-207338603a61.jpg?v=1782899252","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn075610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}