Description
The Lennox 78L42 is a 24-volt, two-stage natural gas valve engineered as a direct OEM replacement for compatible Lennox heating systems. Designed to deliver precise, staged fuel control, this gas valve supports two-stage furnace operation — enabling a low-fire stage for mild heating demands and a high-fire stage for peak heating output. The result is improved comfort, reduced temperature swings, and greater energy efficiency compared to single-stage operation.
Key Features
- OEM Lennox replacement gas valve (SKU: 78L42)
- 24-volt operating voltage for compatibility with standard furnace control boards
- Two-stage operation: low-fire and high-fire for enhanced comfort and efficiency
- Configured for natural gas (NAT) fuel type
- 1/2″ inlet/outlet connection for straightforward installation
- Designed for reliable, consistent fuel delivery and safe shutoff
Application
This gas valve is intended for use in Lennox two-stage gas furnaces requiring an OEM-spec replacement. Always verify compatibility with your specific furnace model number before installation. Installation should be performed by a licensed HVAC technician in accordance with local codes and the manufacturer’s guidelines.
Specifications
- Brand: Lennox
- Part Number: 78L42
- Voltage: 24V
- Stages: 2-Stage
- Fuel Type: Natural Gas (NAT)
- Connection Size: 1/2″
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