Lennox 66J54 Control Transformer 600V PRI / 24V SEC 70VA 3.5A

The Lennox 66J54 is an OEM control transformer engineered to deliver stable, low-voltage power to HVAC control circuits in Lennox heating and cooling systems. With a 600V primary winding stepping down to a 24V secondary output, this transformer provides the reliable 24V AC signal that thermostats, relays, and control boards depend on for proper system operation.

Key Specifications

• Primary Voltage: 600V
• Secondary Voltage: 24V AC
• VA Rating: 70VA
• Secondary Current: 3.5 Amps
• OEM Part Number: 66J54
• Brand: Lennox

Product Features

• Designed as a direct OEM replacement for compatible Lennox equipment
• Steps down 600V primary supply to a safe 24V secondary output for control circuit use
• 70VA capacity supports thermostats, contactors, relays, and control boards
• 3.5A secondary current rating provides ample capacity for multi-zone and multi-component control systems
• Built to Lennox quality standards for long-lasting, dependable performance

Application

The Lennox 66J54 transformer is the correct replacement for Lennox systems requiring a 600V-to-24V step-down control transformer. It is commonly used in commercial and residential HVAC applications where the incoming power supply is 600V and a stable 24V control signal is required. Always verify compatibility with your specific Lennox equipment model before installation.