OEM Carrier Control Transformer 208/240V to 24V 40VA — HT01BD209 for Model PY3GNAA60130NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNAA60130NA packaged HVAC unit. The transformer steps down line voltage from 208/240V to the 24V AC that powers your system's entire low-voltage control circuit — including the thermostat, gas valve, contactor coil, and control board. When this part fails, the result is typically a completely unresponsive system: the thermostat goes blank, the unit won't respond to any call for heating or cooling, and no control-side components operate. A quick 24V check at the transformer secondary terminals will confirm failure.

• Specs: Input (Primary) 208/240V | Output (Secondary) 24V | Power Rating: 40VA | Frequency: 50/60 Hz | Factory-matched OEM dimensions and terminal configuration
• OEM vs Generic: OEM transformers are wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full control-circuit load. Generic units are often under-spec'd in VA capacity, leading to brownout voltages that cause erratic board behavior or premature contactor failure.
• Install difficulty: 2/5 — Turn off all power at the disconnect and breaker before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label and photograph all control wiring before disconnecting. Verify 24V output at secondary terminals after installation before restoring full power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-specified replacement for Carrier model PY3GNAA60130NA. Verify your unit's data plate voltage (208V or 240V) matches the transformer's dual-tap primary before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us today and we'll confirm the correct part for your unit.