OEM Carrier Transformer 40VA 120V to 24V for Model C50A502564

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier C50A502564 packaged rooftop unit. The transformer steps line voltage down from 120V to the 24V AC required to power the entire low-voltage control circuit — including the thermostat, contactor coils, gas valve, and control board. When this transformer fails, the entire system goes silent: no thermostat response, no contactor pull-in, and no ignition sequence. If your system is completely unresponsive and you have confirmed 120V power at the unit, a failed transformer is one of the first components to test.

• Specs: Input: 120V AC | Output: 24V AC | Rating: 40VA | OEM Part Number: HT01BD702 | Factory-matched for Carrier C50A502564 commercial rooftop units
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring the control circuit receives stable, clean 24V power. Generic transformers frequently run under-rated VA, causing voltage sag under load that leads to intermittent contactor chatter and nuisance lockouts.
• Install difficulty: 2/5 — Always shut off line-voltage power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Confirm secondary output voltage after installation before restoring thermostat power. Label and photograph all low-voltage wiring before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for the Carrier C50A502564 commercial packaged rooftop unit. Verify your unit's data plate shows 120V primary input before ordering. Compatible with standard 40VA control circuit loads. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you order — ships same day.