Fenwal 35-671922-151 Control
The Fenwal 35-671922-151 is a high-performance 120V ignition control module designed for precise combustion management in commercial and industrial gas-fired appliances. Engineered as a hot surface ignition (HSI) solution, this microprocessor-based controller is capable of managing systems exceeding 400,000 BTU, making it a staple for heavy-duty furnaces and boilers. This specific Fenwal 35-67 series model features a 15-second pre-purge period (15sPP) to clear the combustion chamber of residual gases, followed by a 5-second trial for ignition (5sTFI). To ensure reliable startup in demanding environments, the module is programmed for three ignition attempts (3Try) before entering a safety lockout state, significantly reducing nuisance service calls caused by transient ignition failures.
Built for durability in high-vibration applications, the Fenwal 35-671922-151 integrates a combustion blower relay and monitors the pressure switch to verify proper airflow before energizing the 120V igniter. The onboard microprocessor ensures repeatable timing cycles and stable flame sensing, which is critical for maintaining ASME CSD-1 compliance in regulated installations. For troubleshooting, the unit provides diagnostic LED signals to identify common faults such as airflow issues or flame signal loss, allowing technicians to pinpoint errors without extensive teardown. This HVAC ignition module is compatible with natural, LP, and manufactured gases, providing a versatile replacement for aging or failed 120V HSI controls.
Key Benefits for Technicians:
- Optimized Ignition Reliability: The 3-try ignition sequence provides multiple opportunities to establish a flame, minimizing downtime in cold-start conditions.
- Integrated System Safety: Constant monitoring of the pressure switch and flame current ensures the gas valve only remains open when safe combustion is verified.
- Advanced Troubleshooting: Diagnostic LED codes simplify HVAC control board diagnostics, reducing the time spent on-site during emergency repairs.
- High-Capacity Support: Designed to handle gas-fired heating systems with outputs over 400K BTU, suitable for larger industrial footprints.
- Standardized Timing: Fixed 15-second pre-purge and 5-second TFI intervals meet rigorous safety standards for commercial combustion sequencing.
Common Questions Regarding the 35-671922-151:
How do I reset the module after an ignition lockout?
Lockout can typically be cleared by cycling the thermostat or removing the 120V power supply for approximately five seconds. Some configurations may also support a remote reset input depending on the wiring harness used.
Can this 120V module be used in place of a 24V version?
No. The Fenwal 35-671922-151 is specifically rated for 120V input and 120V igniters. Swapping voltage ratings will cause immediate component failure and poses a significant safety risk.
What does it mean if the LED is flashing a specific code?
The LED provides fault-specific data. For example, three flashes typically indicate an ignition lockout after three failed trials, while one flash often points to an airflow or pressure switch fault.
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.
Original: $382.85
-65%$382.85
$134.00Fenwal 35-671922-151 Control
The Fenwal 35-671922-151 is a high-performance 120V ignition control module designed for precise combustion management in commercial and industrial gas-fired appliances. Engineered as a hot surface ignition (HSI) solution, this microprocessor-based controller is capable of managing systems exceeding 400,000 BTU, making it a staple for heavy-duty furnaces and boilers. This specific Fenwal 35-67 series model features a 15-second pre-purge period (15sPP) to clear the combustion chamber of residual gases, followed by a 5-second trial for ignition (5sTFI). To ensure reliable startup in demanding environments, the module is programmed for three ignition attempts (3Try) before entering a safety lockout state, significantly reducing nuisance service calls caused by transient ignition failures.
Built for durability in high-vibration applications, the Fenwal 35-671922-151 integrates a combustion blower relay and monitors the pressure switch to verify proper airflow before energizing the 120V igniter. The onboard microprocessor ensures repeatable timing cycles and stable flame sensing, which is critical for maintaining ASME CSD-1 compliance in regulated installations. For troubleshooting, the unit provides diagnostic LED signals to identify common faults such as airflow issues or flame signal loss, allowing technicians to pinpoint errors without extensive teardown. This HVAC ignition module is compatible with natural, LP, and manufactured gases, providing a versatile replacement for aging or failed 120V HSI controls.
Key Benefits for Technicians:
- Optimized Ignition Reliability: The 3-try ignition sequence provides multiple opportunities to establish a flame, minimizing downtime in cold-start conditions.
- Integrated System Safety: Constant monitoring of the pressure switch and flame current ensures the gas valve only remains open when safe combustion is verified.
- Advanced Troubleshooting: Diagnostic LED codes simplify HVAC control board diagnostics, reducing the time spent on-site during emergency repairs.
- High-Capacity Support: Designed to handle gas-fired heating systems with outputs over 400K BTU, suitable for larger industrial footprints.
- Standardized Timing: Fixed 15-second pre-purge and 5-second TFI intervals meet rigorous safety standards for commercial combustion sequencing.
Common Questions Regarding the 35-671922-151:
How do I reset the module after an ignition lockout?
Lockout can typically be cleared by cycling the thermostat or removing the 120V power supply for approximately five seconds. Some configurations may also support a remote reset input depending on the wiring harness used.
Can this 120V module be used in place of a 24V version?
No. The Fenwal 35-671922-151 is specifically rated for 120V input and 120V igniters. Swapping voltage ratings will cause immediate component failure and poses a significant safety risk.
What does it mean if the LED is flashing a specific code?
The LED provides fault-specific data. For example, three flashes typically indicate an ignition lockout after three failed trials, while one flash often points to an airflow or pressure switch fault.
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.
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Description
The Fenwal 35-671922-151 is a high-performance 120V ignition control module designed for precise combustion management in commercial and industrial gas-fired appliances. Engineered as a hot surface ignition (HSI) solution, this microprocessor-based controller is capable of managing systems exceeding 400,000 BTU, making it a staple for heavy-duty furnaces and boilers. This specific Fenwal 35-67 series model features a 15-second pre-purge period (15sPP) to clear the combustion chamber of residual gases, followed by a 5-second trial for ignition (5sTFI). To ensure reliable startup in demanding environments, the module is programmed for three ignition attempts (3Try) before entering a safety lockout state, significantly reducing nuisance service calls caused by transient ignition failures.
Built for durability in high-vibration applications, the Fenwal 35-671922-151 integrates a combustion blower relay and monitors the pressure switch to verify proper airflow before energizing the 120V igniter. The onboard microprocessor ensures repeatable timing cycles and stable flame sensing, which is critical for maintaining ASME CSD-1 compliance in regulated installations. For troubleshooting, the unit provides diagnostic LED signals to identify common faults such as airflow issues or flame signal loss, allowing technicians to pinpoint errors without extensive teardown. This HVAC ignition module is compatible with natural, LP, and manufactured gases, providing a versatile replacement for aging or failed 120V HSI controls.
Key Benefits for Technicians:
- Optimized Ignition Reliability: The 3-try ignition sequence provides multiple opportunities to establish a flame, minimizing downtime in cold-start conditions.
- Integrated System Safety: Constant monitoring of the pressure switch and flame current ensures the gas valve only remains open when safe combustion is verified.
- Advanced Troubleshooting: Diagnostic LED codes simplify HVAC control board diagnostics, reducing the time spent on-site during emergency repairs.
- High-Capacity Support: Designed to handle gas-fired heating systems with outputs over 400K BTU, suitable for larger industrial footprints.
- Standardized Timing: Fixed 15-second pre-purge and 5-second TFI intervals meet rigorous safety standards for commercial combustion sequencing.
Common Questions Regarding the 35-671922-151:
How do I reset the module after an ignition lockout?
Lockout can typically be cleared by cycling the thermostat or removing the 120V power supply for approximately five seconds. Some configurations may also support a remote reset input depending on the wiring harness used.
Can this 120V module be used in place of a 24V version?
No. The Fenwal 35-671922-151 is specifically rated for 120V input and 120V igniters. Swapping voltage ratings will cause immediate component failure and poses a significant safety risk.
What does it mean if the LED is flashing a specific code?
The LED provides fault-specific data. For example, three flashes typically indicate an ignition lockout after three failed trials, while one flash often points to an airflow or pressure switch fault.
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.
