OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA030060NB

The Carrier HT01BD209 is the factory-specified 40VA step-down control transformer for the PY3PNA030060NB packaged unit. Its job is to convert 208/240V line voltage down to the 24V signal voltage that powers the thermostat, contactor coils, gas valve, and every other low-voltage control component in the system. When this transformer fails — due to a shorted coil, overload, or wiring fault — the entire control circuit goes dead: the thermostat goes blank, nothing responds to a call for heating or cooling, and the unit won't run at all.

• Specs: Input 208/240V | Output 24V | Rating: 40VA | Frequency: 50/60 Hz | OEM Part #: HT01BD209 | Factory-matched to Carrier PY3PNA030060NB
• OEM vs Generic: This is the genuine Carrier OEM part, wound and rated to exact factory specifications. Aftermarket transformers often use thinner gauge wire and looser VA tolerances, leading to overheating and premature burnout — especially under high control-circuit loads.
• Install difficulty: 2/5 — Always disconnect power at the disconnect and confirm zero voltage with a multimeter before touching wiring. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Confirm secondary output is ~26–28V (no load) before closing up the unit.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PNA030060NB packaged units. Also cross-references to other Carrier, Bryant, and Payne models using 208/240V primary, 24V secondary, 40VA transformers — always verify your unit's data plate voltage and VA rating before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy.