{"product_id":"carrier-ph3zna048000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH3ZNA048000AA","description":"\u003ch1\u003eOEM Carrier 75VA Control Transformer HT01BD242 for Model PH3ZNA048000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH3ZNA048000AA\u003c\/strong\u003e packaged unit. The transformer is the backbone of the 24V control circuit — it steps down the high-voltage primary supply (208\/240\/480V) to the 24VAC signal that powers your thermostat, contactor coil, control board, and safety circuits. When this transformer fails, the entire control circuit goes dark: the thermostat becomes unresponsive, the system won't start, and you may measure 0V at the secondary terminals despite line voltage being present at the primary.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V (50\/60 Hz) | Secondary: 24VAC | Foot-mount configuration | Factory-matched replacement for OEM part HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM part, manufactured to exact VA and voltage tolerances. Undersized or off-brand transformers can overheat, trip thermal protection, and damage sensitive control boards — OEM is always the correct choice for packaged RTU applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Requires disconnecting line-voltage wiring; always shut off power at the disconnect and confirm with a non-contact voltage tester before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal.\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 Direct OEM replacement for the \u003cstrong\u003eCarrier PH3ZNA048000AA\u003c\/strong\u003e packaged unit. Also cross-references to Carrier furnace, heat pump, and commercial rooftop applications sharing the HT01BD242 specification. Verify primary voltage (208\/240\/480V) against your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641341759859,"sku":"CARRIE-PH3ZNA048000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641341792627,"sku":"CARRIE-PH3ZNA048000AA-TRANSFORMER-HT01BD242-GEN","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD242_624c1cc2-afe2-402e-9c85-a3b62a0882ee.jpg?v=1782943304","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3zna048000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}