OEM Carrier Transformer 460V Primary / 230V Secondary 1564VA for Model PY4GEWB42090AA

This is the genuine OEM factory-replacement transformer (part number HT01BC701) for the Carrier PY4GEWB42090AA packaged rooftop unit. This heavy-duty step-down transformer converts 460V primary power to a 230V secondary output at a robust 1564VA rating, supplying reliable power to the unit's internal electrical components and subsystems. When this transformer fails, the entire unit may go completely unresponsive — no fan, no cooling, no heating — because the downstream control and power circuits lose their operating voltage. Diagnosing a failed transformer is typically confirmed by measuring the secondary output with a multimeter while the primary is energized; a reading near 0V on the secondary confirms failure.

• Specs: 460V Primary | 230V Secondary | 1564VA Rating | OEM Part # HT01BC701 | Cross-reference: BE33426001 / RC6800182
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part manufactured to exact OEM voltage and VA tolerances. Off-brand substitutes risk under-rated VA capacity, leading to overheating, nuisance tripping, or premature failure of downstream components.
• Install difficulty: 4/5 — This is a high-voltage commercial transformer (460V primary). Work must be performed by a licensed HVAC/R technician. Disconnect and lock out all power before beginning. Tools needed: multimeter, insulated screwdrivers, wire strippers, and appropriate PPE. Always photograph and label all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the direct OEM replacement for the Carrier PY4GEWB42090AA packaged rooftop unit. Also compatible with select Carrier, Bryant, and Payne RTU, heat pump, and central air conditioner models requiring a 460V/230V 1564VA step-down transformer — verify against your unit's data plate and wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists will confirm compatibility before you buy.