{"product_id":"carrier-c50a402064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A402064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A402064\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C50A402064\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and all low-voltage controls. When the transformer fails, the entire control circuit goes dead — the thermostat shows no response, the system won't energize, and no heating or cooling occurs. It is often the first component to check when a unit is completely unresponsive despite confirmed line power at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact impedance and VA specifications, ensuring stable 24V output under full control circuit load. Generic transformers often run undervoltage under peak demand, causing nuisance lockouts and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install). Label all low-voltage wires before disconnecting. The transformer typically mounts to the control panel bracket with two screws and uses push-on or screw-terminal connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC50A402064\u003c\/strong\u003e commercial rooftop\/packaged unit. Verify your unit's data plate shows 120V primary control voltage before ordering. If your unit uses a 208\/240V primary, do not substitute — contact our team to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you order, and we ship same day so your unit is back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909687857523,"sku":"CARRIE-C50A402064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909687890291,"sku":"CARRIE-C50A402064-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_db1efbc1-78f6-4183-8733-00f6d1b6c245.jpg?v=1782940486","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a402064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}