Fenwal 35-704600-001 Control

The Fenwal 35-704600-001 is a microprocessor-based 120V Direct Spark Ignition (DSI) control engineered for high-performance gas-fired equipment. This ignition module is designed to manage natural, LP, and manufactured gas systems with a focus on precision and safety. Featuring a 4-second Trial for Ignition (TFI) and a strict 1-try ignition sequence, it eliminates unburned gas buildup by entering immediate lockout if flame monitoring is not established. Designed with no pre-purge (0-second), this control ensures rapid burner engagement for high-demand industrial and commercial HVACR applications.

The Fenwal 35-70 series utilizes advanced on-board diagnostics with an integrated LED for real-time troubleshooting, allowing technicians to quickly identify flame sense issues or internal faults. The conformal coated board provides superior moisture resistance, maintaining reliability in environments ranging from -40°F to 175°F. This module is a direct OEM replacement for various universal furnace parts and legacy Fenwal analog controls, featuring 1/4 inch quick-connect terminals for streamlined field installation. With a high-current gas valve relay rated for 1.5A at 120 VAC, it provides stable power cycles for heavy-duty gas burner applications.

• Precise Microprocessor Control: Delivers repeatable timing for ignition sequences and flame sensing.
• Diagnostic LED: Simplifies troubleshooting by providing specific flash codes for system lockouts or hardware failures.
• Rugged Construction: Conformal coating protects internal circuitry against dust, vibrations, and high humidity.
• Fast Response: Features a 0.8-second flame failure response time to ensure safe system shutdown.
• Versatile Mounting: Not position-sensitive; can be mounted horizontally or vertically to fit compact control cabinets.

• What fuel types is this control compatible with? It is designed for use with Natural, Liquefied Petroleum (LP), and Manufactured gases.
• How do I reset the module after an ignition lockout? Since this is a single-try model without auto-reset, you must manually cycle the thermostat or remove 120V power for 5 seconds to clear the lockout.
• Can I measure flame current on this board? Yes, the Fenwal 35-704600-001 includes FC+ and FC- test pins for measuring DC microamps; a minimum of 1.0 µA is required for stable operation.

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.