{"product_id":"carrier-py3ppa030040nb-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V for PY3PPA030040NB","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V — Model PY3PPA030040NB\u003c\/h1\u003e\u003cp\u003eThe \u003cstrong\u003eCarrier HT01BD209\u003c\/strong\u003e is the factory-specified 40VA control transformer for the \u003cstrong\u003ePY3PPA030040NB\u003c\/strong\u003e packaged unit. Its sole but critical job is to step down the 208\/240V line voltage to the 24V signal needed to power every low-voltage control circuit in your system — thermostat, control board, contactor coil, and all safety switches. When this transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no components will energize. It is frequently the first part to check when a unit appears completely dead despite having line voltage at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA power rating | Input: 208\/240V primary | Output: 24V secondary | Frequency: 50\/60 Hz | OEM Part #: HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to factory tolerances, ensuring stable 24V output under full VA load. Generic transformers can sag under load, causing erratic board resets, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Turn off ALL power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a meter before buttoning up the unit.\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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePY3PPA030040NB\u003c\/strong\u003e packaged units. Verify your unit's data plate shows a 208\/240V primary and 24V secondary control circuit before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640368484723,"sku":"CARRIE-PY3PPA030040NB-TRANSFORMER-HT01BD209","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640368517491,"sku":"CARRIE-PY3PPA030040NB-TRANSFORMER-HT01BD209-GEN","price":48.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_90e1f93e-e50e-4e0b-b2b5-4a7ef8afc27c.jpg?v=1775025722","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3ppa030040nb-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}