Fenwal 35-705505-017 Control

The Fenwal 35-705505-017 is a microprocessor-based 120V Direct Spark Ignition (DSI) control engineered for precision in gas-fired appliances. This ignition control module features a 15-second trial for ignition (TFI) and is factory-configured for a 3-try ignition sequence, ensuring reliable burner light-off even in demanding environments. Designed to manage gas valves and monitor flame rectification, it provides 120 VAC DSI control for systems up to 400K BTU, including commercial cooking equipment, crop dryers, and infrared heaters. The onboard microprocessor delivers repeatable timing with +/- 5% accuracy, significantly outperforming legacy analog 05-14 series units. With a diagnostic LED that flashes specific error codes, troubleshooting field faults—such as flame loss or hardware failure—is streamlined for fast service recovery. The rugged, moisture-resistant enclosure and polarity-insensitive flame sensing make this Fenwal 35-70 series module a versatile choice for rigorous HVACR applications.

• Enhanced Reliability: The 3-try ignition sequence and 15-second TFI provide multiple opportunities for safe burner light-off before lockout.
• Advanced Diagnostics: Built-in diagnostic LED status indicator identifies three distinct error codes, reducing downtime during service calls.
• Precise Flame Sensing: Utilizing local flame sense technology with 1.0 µA minimum threshold for stable operation and reduced nuisance lockouts.
• Simplified Installation: Features 1/4-inch quick-connect terminals and a compact footprint for easy integration into tight equipment cabinets.
• Durable Construction: The conformal-coated circuit board protects against vibration and moisture in agricultural or industrial settings.

What does a steady LED light on the Fenwal 35-705505-017 indicate?
A steady LED typically signals an internal software or hardware failure. If this persists after a power-cycle reset (removing 120V for 5 seconds), the module generally requires replacement.

How do I check the flame current on this DSI module?
Use a multimeter capable of measuring microamps (µA). Connect the leads to the FC+ and FC- flame current test pins while the burner is active; a reading of 1.0 µA or higher indicates a healthy flame signal.

Can the 35-705505-017 replace older analog Fenwal controls?
Yes, this microprocessor-based unit is the standard replacement for legacy Fenwal 05-14 and 05-38 analog 120V controls, though wiring adjustments may be necessary for local sense electrodes.

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.