{"product_id":"carrier-c4850c50zn055500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN055500 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C50ZN055500\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C4850C50ZN055500\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to the 24V signal voltage required to power the control board, thermostat circuit, and all low-voltage system controls. When this component fails, the entire control circuit goes dead — the thermostat loses communication, the unit will not respond to any calls for heating or cooling, and no safety outputs will function. A failed transformer is often misdiagnosed as a control board failure, making correct identification critical before replacing more expensive components.\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 for Carrier C4850C50ZN055500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage specifications. Generic transformers may be under-rated in VA capacity, causing overheating and premature failure when the 24V circuit draws full load during defrost or multi-stage operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Check for a blown 3A fuse on the secondary side before condemning the transformer — a shorted zone valve or thermostat wire can blow the secondary circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders received by 3 PM local time ship same business day from our HVAC-dedicated warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eC4850C50ZN055500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If you are unsure of fitment, our parts specialists can confirm compatibility using your full model and serial number. In stock and ready to ship — order today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909772366195,"sku":"CARRIE-C4850C50ZN055500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909772398963,"sku":"CARRIE-C4850C50ZN055500-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_43ab61af-4d90-4832-bd84-d064839b1538.jpg?v=1782939077","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn055500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}