{"product_id":"carrier-py3pna024060ab-transformer-h30291","title":"OEM Carrier 40VA Transformer 120V–24V for PY3PNA024060AB","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA024060AB\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier PY3PNA024060AB\u003c\/strong\u003e packaged HVAC system. The transformer steps down line voltage from 120V to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, control board, and zone controls. When this transformer fails, the system goes completely dark at the thermostat and nothing operates. A shorted transformer will often trip or blow the control fuse as well.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD209 | Factory-matched windings and mounting footprint for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact Carrier factory specifications, ensuring precise 24V output under full load. Off-brand transformers frequently underperform at rated VA, causing erratic thermostat behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after installation). Always label and photograph all low-voltage wiring before disconnecting terminals.\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 warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits Carrier model \u003cstrong\u003ePY3PNA024060AB\u003c\/strong\u003e packaged HVAC unit. Verify transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640400302451,"sku":"CARRIE-PY3PNA024060AB-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640400335219,"sku":"CARRIE-PY3PNA024060AB-TRANSFORMER-HT01BD209-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_aa80fec1-fa30-46be-8c4b-f722bb86a7e6.jpg?v=1775016370","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3pna024060ab-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}