Description
The Lennox 47K20 is an OEM replacement control transformer engineered to deliver consistent, low-voltage power to HVAC control circuits. Stepping down a 208/240V primary supply to a 24V secondary output at a 40VA rating, this transformer is a direct-fit solution for Lennox heating and cooling systems that rely on dependable 24V control voltage for thermostats, relays, and other control components.
Key Features
- Primary voltage: 208/240V
- Secondary voltage: 24V
- VA rating: 40VA
- OEM Lennox replacement part — SKU 47K20
- Designed for use in Lennox HVAC systems requiring 24V control circuit power
- Provides stable, regulated low-voltage output to protect sensitive control components
- Supports thermostats, contactors, relays, and other 24V control devices
Application
The 47K20 transformer is ideal for technicians performing maintenance, repair, or replacement on compatible Lennox furnaces, air handlers, and packaged units. Its 40VA capacity ensures sufficient power delivery for standard 24V control circuits, making it a reliable choice for restoring full system functionality.
Specifications
- Brand: Lennox
- Part Number: 47K20
- Primary Voltage: 208/240V
- Secondary Voltage: 24V
- VA Rating: 40VA









