OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A602764

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C50A602764 commercial packaged unit. The transformer steps down 120V line voltage to the 24V AC signal required by your thermostat, control board, contactor coil, and all low-voltage control components. When this part fails, the entire control circuit loses power — the result is a completely unresponsive system with no thermostat communication, no contactor pull-in, and no heating or cooling output whatsoever.

• Specs: 40VA output rating | Primary: 120V AC | Secondary: 24V AC | Hardwired lead connections | Compact form factor for panel mounting
• OEM vs Generic: This is a genuine OEM Carrier transformer matched to factory specifications for the C50A602764. Generic transformers often lack proper VA rating tolerance, leading to premature failure under full control-circuit load — particularly in commercial applications where multiple zone valves or relays share the 24V circuit.
• Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Always verify 0V at primary leads before handling. Label all wiring before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier C50A602764 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment specialists are available to confirm compatibility before you purchase. Order today — this part ships same business day.