The Fenwal 35-705701-505 is a versatile 120V AC ignition control module engineered for reliable direct spark ignition of gas valves and gas-fired equipment across a broad range of commercial, agricultural, and industrial burner applications. With configurable wiring options, multiple trial ignition settings, and a built-in diagnostic LED, this control simplifies installation and troubleshooting alike. Also sold and cross-referenced as NBK Parts 20301.
Designed for dependability in demanding environments, the Fenwal 35-705701-505 handles direct spark ignition for 120V AC gas burner systems rated up to 400,000 BTU. Its automatic hourly reset function means the control self-recovers from lockout conditions without manual intervention, reducing downtime in unattended or remote installations.
Whether you are replacing a failed ignition board on a construction heater, crop dryer, or commercial cooking appliance, the 35-705701-505 delivers the flexibility needed to match your existing wiring and ignition sequence requirements. Three enclosure configurations and two wiring options make it adaptable across a wide range of OEM chassis designs.
Control automatically clears ignition lockout and resets once per hour -- reducing manual intervention in remote or unattended equipment.
Onboard LED communicates fault status at a glance: steady on indicates control fault, 2 flashes means flame with no call for heat, 3 flashes signals ignition lockout.
Choose from 4 trial ignition time settings and 2 trial ignition sequence options to match the response requirements of your specific burner system.
Rated for construction heaters, agricultural and crop dryers, ceramic and infrared heaters, and commercial cooking equipment -- any 120V AC gas burner under 400K BTU.
The 35-705701-505 is designed for use with a wide variety of 120V AC gas-fired appliances and burner assemblies. Typical compatible applications include:
The onboard LED indicator gives immediate fault feedback without requiring a separate meter or diagnostic tool:
The 35-705701-505 mounts directly in the appliance control enclosure. Installation requires connecting line voltage (120V AC), gas valve output, spark electrode lead, and flame sensor input according to the selected wiring configuration. The module supports two wiring options to accommodate different OEM terminal layouts.