{"product_id":"carrier-py3ppa042090ab-transformer-h30291","title":"OEM Carrier Transformer 40VA 208\/240V–24V for PY3PPA042090AB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY3PPA042090AB\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PY3PPA042090AB\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (208\/240V) to the 24V AC signal that powers your system's entire control circuit — including the thermostat, contactor coil, and safety switches. When this transformer fails, the result is total control circuit loss: the thermostat goes blank, the system won't respond to any call for heating or cooling, and fuses or breakers may trip repeatedly due to a shorted secondary winding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 208\/240V | Output 24V | 40VA power rating | 50\/60 Hz | OEM part number HT01BD209 | Factory-matched to Carrier PY3PPA042090AB wiring harness and mounting footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance aftermarket units can cause nuisance faults, board damage, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or masking tape. Photograph all wiring before disconnecting leads. Verify 24V output with a multimeter before restoring power.\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 for \u003cstrong\u003eCarrier model PY3PPA042090AB\u003c\/strong\u003e packaged units. Verify input voltage on your unit's data plate — this transformer is rated for 208\/240V primary input only. Not compatible with 120V primary applications. Questions about fitment? Our HVAC parts specialists verify compatibility before every order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640356491635,"sku":"CARRIE-PY3PPA042090AB-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640356524403,"sku":"CARRIE-PY3PPA042090AB-TRANSFORMER-HT01BD209-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-HT01BD209_a1dae570-3f0d-4e5f-aac1-1d4e6f02c959.jpg?v=1782942433","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3ppa042090ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}