Fenwal 35-705701-005 Control

The Fenwal 35-705701-005 is a high-performance 120V Direct Spark Ignition (DSI) Control designed for heavy-duty gas-fired applications. Built with a rugged potted enclosure for protection against vibration and moisture, this microprocessor-based module delivers precise, repeatable timing for commercial cooking equipment, agricultural heaters, and infrared burners. It features a 10-second Trial for Ignition (TFI) and remote flame sensing with a 1.0 microamp minimum sensitivity. This specific 35-70 series model is engineered for reliability in washdown environments, utilizing a polarity-insensitive design that simplifies field wiring and minimizes nuisance lockouts. With a 0.8-second maximum flame failure response time and on-board LED diagnostics, it allows technicians to rapidly identify fault codes, ensuring minimal downtime in critical heating systems. The unit is rated for gas valves up to 1.5A and operates effectively in ambient temperatures ranging from -40°F to +175°F.

Key Contractor Benefits:

• Environmental Protection: The potted design seals internal components against extreme vibration, humidity, and atmospheric contaminants.
• Simplified Troubleshooting: Integrated diagnostic LED indicators provide immediate status updates and fault code identification.
• Versatile Compatibility: Designed for use with Natural, LP, and manufactured gases in systems up to 400K BTU.
• Flexible Installation: Polarity-insensitive flame sensing and quick-connect terminals reduce wiring errors and labor time.
• Rapid Response: Microprocessor logic ensures a flame failure response time of 0.8 seconds or less for enhanced safety.

Technical FAQs:

How do you reset the 35-705701-005 after a lockout?
This module utilizes a thermostat/power-off reset. To clear a lockout, cycle the 120 VAC power at the source or reset the thermostat for at least 5 seconds.

What does the LED indicator signify during operation?
During a normal start-up, the LED lights for one second. If a fault occurs, the LED will flash specific codes—such as 3 flashes for ignition lockout—to guide technical troubleshooting.

Can this control be used with local flame sensing?
No, the Fenwal 35-705701-005 is specifically configured for remote flame sensing via an external electrode or flame rod.

What are the spark gap requirements for proper ignition?
For optimal performance, maintain an electrode spark gap of 0.125 inches (± 0.031 in). Proper burner grounding is essential for consistent flame signal rectification.

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.