Lennox 78L62 Gas Valve

The Lennox 78L62 Gas Valve is a high-performance two-stage liquid propane (LP) control designed for heavy-duty residential and commercial heating cycles. Engineered as a direct OEM and field replacement, including cross-compatibility with the Honeywell VR8305Q4161 and VR8305M4012 series, this valve manages high-demand fuel delivery with precision. It features a 3/4-inch NPT inlet and outlet to ensure maximum flow capacity for high-BTU equipment. The integrated regulator is factory-set for LP applications, maintaining a low-fire manifold pressure of 5.5 inches WC and a high-fire pressure of 10.5 inches WC. Operating on a standard 24V furnace control circuit, this dual-stage valve provides the modulation necessary for modern high-efficiency furnaces, ensuring stable combustion across varying load demands. Its robust construction is rated for an ambient temperature range of -40°F to 175°F, making it reliable in unconditioned mechanical rooms or rooftop units. For technicians performing LP furnace gas valve replacement, the 78L62 offers a seamless fit into existing manifold assemblies without extensive piping modifications.

• Dual-Stage Modulation: Supports both high and low-fire operation for superior temperature control and energy efficiency.
• High Flow Capacity: The 3/4" gas valve connection accommodates larger appliance loads compared to standard 1/2" variants.
• LP-Specific Calibration: Pre-configured for propane with a 5.5/10.5" WC pressure range, reducing field adjustment time.
• Broad Compatibility: Functions as a drop-in replacement for several Honeywell VR8305 series valves used in Lennox equipment.
• Industrial-Grade Durability: Built to withstand extreme temperatures, ensuring consistent pilot-to-main burner ignition.

Is the Lennox 78L62 compatible with natural gas systems?
No, this specific model is factory-configured for LP (Liquefied Petroleum) gas. For natural gas applications, a different regulator spring or a specific natural gas model would be required.

Can I replace a 1/2" NPT valve with this 3/4" NPT model?
This valve requires 3/4" pipe threading. If your current manifold uses 1/2" piping, you will need appropriate reducers or bushed fittings, provided the BTU requirements of the appliance are met.

What are the voltage requirements for this valve?
The valve operates on a standard 24 VAC ignition system, common in most residential and commercial HVAC control boards.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.