Fenwal 35-605959-223 Control

The Fenwal 35-605959-223 Control is a 24 VAC microprocessor-based ignition module designed for high-precision direct spark ignition (DSI) sequences. This technical-grade component serves as a field-proven replacement for Johnson Controls G765BCA-12 and Lennox 44L59, ensuring seamless integration into existing gas-fired HVAC systems. Engineered for rugged industrial and commercial environments, it features 30-second pre-purge and 30-second inter-purge timings to ensure safe combustion cycles, along with a 7-second trial for ignition. The on-board LED diagnostic system provides real-time fault codes, significantly reducing troubleshooting time for technicians. This module supports both local and remote flame sensing and includes multiple ground terminals to simplify complex wiring configurations.

• Universal Compatibility: Direct drop-in replacement for JCI G76x series and Lennox 44L59 controls.
• Advanced Diagnostics: Multi-color LED feedback allows for rapid identification of ignition failures or flame sensing issues.
• Precise Timing Control: Microprocessor logic manages purge cycles and ignition attempts with +/- 5% accuracy.
• Flexible Installation: Features a junction box mounting design and conformal coating for moisture resistance up to 95% R.H.
• Stable Flame Supervision: Minimum flame sensitivity of 0.7 microamps ensures consistent operation even in demanding burner configurations.

• What are the terminal designations for this board? The Fenwal 35-605959-223 utilizes industry-standard markings including TH/W (thermostat), V1 and V2 (gas valve), S1 (remote sense), and FC+ / FC- (flame current test points).
• How do I check the flame signal? Technicians can measure the DC microamp signal directly at the FC+ and FC- test pins without breaking the flame circuit, allowing for non-intrusive monitoring.
• What happens if the burner fails to light? This control is a multi-try module that will perform additional ignition attempts after an inter-purge delay before entering a safe lockout state.

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.