Fenwal 35-705500-005 Control

The Fenwal 35-705500-005 is a 120V direct spark ignition (DSI) control designed for precise burner sequencing in gas-fired equipment. This microprocessor-based module manages a 10-second trial for ignition (TFI) with a single-try logic, making it a reliable choice for commercial cooking, infrared heaters, and crop dryers. Engineered for 120VAC operation, it features no pre-purge (NoPP), ensuring immediate spark energy delivery upon a call for heat. The Fenwal Series 35-70 utilizes Detect-A-Flame technology for robust flame sensing, effectively monitoring the burner to prevent hazardous gas accumulation. With a conformal coating for moisture resistance, this ignition control module maintains stable performance in demanding environments from -40°F to 175°F. On-board LED diagnostics simplify troubleshooting by providing clear flash codes for system faults, while flame current test pins allow technicians to verify signal strength without breaking the circuit, ensuring the gas valve operates only when a safe flame is confirmed.

• Instant Ignition: Zero pre-purge timing allows for immediate response in high-demand combustion applications.
• Detailed Diagnostics: Integrated LED status indicators provide rapid identification of lockout conditions or hardware failures.
• Robust Construction: Conformal-coated circuit board protects against vibration and moisture in industrial settings.
• Accurate Sensing: Local flame sensing via the spark electrode reduces wiring complexity and improves reliability.
• Versatile Mounting: Polarity-insensitive design and compact footprint allow for vertical or horizontal installation.

How do I reset the control after an ignition lockout?
Since this is a single-try model, a lockout requires a manual reset. You can clear the fault by cycling the thermostat or removing 120VAC power for at least five seconds.

Can I use this for propane (LP) applications?
Yes, the 35-705500-005 is compatible with natural gas, LP, and manufactured gases, provided the appliance matches the 10-second TFI requirement.

What does a steady LED light indicate?
A steady-on LED typically signals an internal microprocessor or hardware fault. Verify all wiring and power levels; if the condition persists, the control likely needs replacement.

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.