Description
Lennox 21709 Two-Way Normally Closed Gas Shutoff Solenoid Valve
The Lennox 21709 is a heavy-duty, 2-way normally closed solenoid valve engineered for reliable air-fuel gas shutoff applications in commercial and industrial HVAC systems. With a robust aluminum body, high-temperature coil, and NEMA 4X-rated enclosure, this valve delivers dependable performance in demanding environments where safety and precision matter most.
Key Features
- 2-way, normally closed (N/C) solenoid valve — automatically shuts off gas flow when de-energized for fail-safe operation
- 1/2″ NPT pipe connections for straightforward installation into standard gas lines
- 120VAC coil voltage for compatibility with common commercial control circuits
- 4.4 Cv flow coefficient supporting up to 238,500 BTU/hr capacity
- Operating pressure range: 0–50 PSI for air and fuel gas service
- Aluminum body construction — lightweight yet corrosion-resistant
- NBR (Nitrile Butadiene Rubber) seals for excellent resistance to natural gas, propane, and other fuel gases
- High-temperature coil rated for elevated operating conditions
- NEMA 4X enclosure with integrated junction box — provides protection against dust, moisture, and corrosion
- Screw terminals in the junction box for secure, code-compliant field wiring
Technical Specifications
- SKU: 21709
- Valve Type: 2-Way Normally Closed Solenoid Valve
- Connection Size: 1/2″ NPT
- Coil Voltage: 120VAC
- Flow Coefficient (Cv): 4.4
- Capacity: 238,500 BTU/hr
- Pressure Range: 0–50 PSI
- Body Material: Aluminum
- Seal Material: NBR (Nitrile)
- Enclosure Rating: NEMA 4X
- Wiring: Junction box with screw terminals
- Coil Type: High Temperature
- Media: Air and Fuel Gas
Application
Designed for use as an air-fuel gas shutoff valve in commercial heating equipment, burner systems, and industrial gas-fired appliances. The normally closed design ensures the valve defaults to a safe, closed position upon loss of power — a critical safety feature for gas-fired systems. The NEMA 4X junction box with screw terminals simplifies installation and meets requirements for outdoor or wash-down environments.
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