Fenwal 35-655600-003 Control

The Fenwal 35-655600-003 is a microprocessor-based 24V Hot Surface Ignition (HSI) control designed for precise combustion management in gas-fired furnaces, boilers, and commercial water heaters. As a robust Ignition Control Module, it utilizes microprocessor logic to monitor the ignition sequence and flame sensing, ensuring safe burner operation under demanding conditions. This specific unit is configured for a single trial for ignition (1Try) with a 7-second trial-for-ignition (7s TFI) window. The 35-655600-003 features 0 seconds pre-purge (0pp) and 0 seconds inter-purge (0IP), providing immediate response upon a call for heat (W terminal). Diagnostic troubleshooting is simplified via the on-board LED indicator, which provides clear fault codes for rapid field assessment. Constructed to handle ambient temperatures from -40°F to 176°F, this Fenwal ignition board is a reliable direct replacement for replaces 35-655800-003 and 05-326225-053, maintaining system uptime and safety without the need for complex field conversions.

Key Benefits:

• Precise Ignition Timing: Integrated microprocessor control ensures repeatable 7-second TFI and 24VAC sequencing.
• Diagnostic Feedback: Built-in LED diagnostics allow technicians to quickly identify flame failures or system lockouts.
• High Compatibility: Designed as an OEM replacement part for diverse gas-fired appliances including pool heaters and furnaces.
• Compact Installation: Features a small footprint with versatile mounting options and 1/4" quick-connect terminals for easy wiring.
• Flame Sensing Accuracy: Uses DETECT-A-FLAME® technology for reliable local or remote flame monitoring with a 0.7 µA minimum sensitivity.

Common Questions:

Does this module support automatic reset?
This specific 35-655600-003 model is a non-resetting version; it requires a manual power cycle at the thermostat or breaker if it enters a lockout state after the single ignition trial.

What is the maximum gas valve current rating?
The gas valve output is rated for a maximum of 2.0A at 24 VAC, making it suitable for standard 24V redundant gas valves used in commercial and residential HVACR equipment.

Can I use this for a 120V or 240V igniter?
While the control input is 24V, the HSI output can handle up to 5.0A for the igniter. Ensure your igniter voltage matches the line voltage supplied to the module's L1 and L2/neutral terminals.

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.