OEM Carrier Control Transformer 40VA 120V–24V for Model PY2PNB024060AB

This is the factory OEM replacement transformer (part number HT01BD209) for the Carrier PY2PNB024060AB packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire system becomes unresponsive: no thermostat display, no staging, no communication between components. It is one of the first parts to check when a unit shows zero control-side activity despite confirmed line voltage at the unit.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD209 | Factory-matched construction for Carrier packaged systems
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and impedance tolerances. Generic transformers may be under-rated for VA load, causing overheating, nuisance tripping of the internal thermal fuse, or unstable 24V output that damages control boards.
• Install difficulty: 2/5 — Shut off all power (line and low-voltage disconnect) before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers, wire labels. Photograph all wiring connections before removal. Confirm secondary output voltage (should read 24–28V AC under load) after install.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY2PNB024060AB packaged unit. Always verify your existing transformer's primary/secondary voltage and VA rating against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment before you purchase — no guesswork required.