Fenwal 35-605903-223 Control
The Fenwal 35-605903-223 is a high-performance 24VAC Direct Spark Ignition (DSI) control specifically engineered for Lennox HVAC systems. As a veterans' choice for field replacements, this microprocessor-based module manages the ignition sequence, flame monitoring, and safety shut-off for natural, LP, and manufactured gas applications. It features a precise 30-second pre-purge and a 30-second inter-purge to clear the combustion chamber, followed by a 7-second trial-for-ignition (TFI) period. The Fenwal 35-60 Series technical design includes a conformal coating for moisture resistance and on-board LED diagnostics to streamline troubleshooting on the job site. This unit effectively replaces various Lennox 80K12 and 80K1201 part numbers, ensuring direct spark ignition reliability and flame rectification accuracy (0.7µA minimum) in demanding residential and commercial environments.
Key Benefits:
- Broad Compatibility: Drop-in replacement for Lennox 80K1201, 36G5701, and 98G2901 models.
- Advanced Diagnostics: Integrated LED indicator provides clear fault codes for rapid system analysis.
- Environmental Durability: Conformal coated PCB allows for stable operation in non-condensing environments up to 95% R.H.
- Safety Timing: Hard-coded 30-second inter-purge ensures safe lighting attempts during multi-trial sequences.
- Robust Operation: Designed to function in extreme ambient temperatures ranging from -40°F to +176°F (-40°C to +80°C).
Common Questions:
What is the necessary flame signal for the Fenwal 35-605903-223 to stay out of lockout?
The control requires a minimum flame sense current of 0.7 microamps. Technicians should use a DC microammeter at the FC terminals to verify the signal strength during the run cycle.
How do I reset the controller after an ignition lockout?
This Lennox Special control can be reset by cycling the thermostat call for heat or by removing 24VAC power at the TH/W terminal for a minimum of five seconds.
Does this unit support local or remote flame sensing?
This specific model is configured for local sense via the high voltage spark electrode; however, it is critical to verify the wiring schematic of the Series 35-60 unit being replaced to ensure proper S1 terminal grounding.
This item is not eligible for free shipping.
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: $204.97
-65%$204.97
$71.74Fenwal 35-605903-223 Control
The Fenwal 35-605903-223 is a high-performance 24VAC Direct Spark Ignition (DSI) control specifically engineered for Lennox HVAC systems. As a veterans' choice for field replacements, this microprocessor-based module manages the ignition sequence, flame monitoring, and safety shut-off for natural, LP, and manufactured gas applications. It features a precise 30-second pre-purge and a 30-second inter-purge to clear the combustion chamber, followed by a 7-second trial-for-ignition (TFI) period. The Fenwal 35-60 Series technical design includes a conformal coating for moisture resistance and on-board LED diagnostics to streamline troubleshooting on the job site. This unit effectively replaces various Lennox 80K12 and 80K1201 part numbers, ensuring direct spark ignition reliability and flame rectification accuracy (0.7µA minimum) in demanding residential and commercial environments.
Key Benefits:
- Broad Compatibility: Drop-in replacement for Lennox 80K1201, 36G5701, and 98G2901 models.
- Advanced Diagnostics: Integrated LED indicator provides clear fault codes for rapid system analysis.
- Environmental Durability: Conformal coated PCB allows for stable operation in non-condensing environments up to 95% R.H.
- Safety Timing: Hard-coded 30-second inter-purge ensures safe lighting attempts during multi-trial sequences.
- Robust Operation: Designed to function in extreme ambient temperatures ranging from -40°F to +176°F (-40°C to +80°C).
Common Questions:
What is the necessary flame signal for the Fenwal 35-605903-223 to stay out of lockout?
The control requires a minimum flame sense current of 0.7 microamps. Technicians should use a DC microammeter at the FC terminals to verify the signal strength during the run cycle.
How do I reset the controller after an ignition lockout?
This Lennox Special control can be reset by cycling the thermostat call for heat or by removing 24VAC power at the TH/W terminal for a minimum of five seconds.
Does this unit support local or remote flame sensing?
This specific model is configured for local sense via the high voltage spark electrode; however, it is critical to verify the wiring schematic of the Series 35-60 unit being replaced to ensure proper S1 terminal grounding.
This item is not eligible for free shipping.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Fenwal 35-605903-223 is a high-performance 24VAC Direct Spark Ignition (DSI) control specifically engineered for Lennox HVAC systems. As a veterans' choice for field replacements, this microprocessor-based module manages the ignition sequence, flame monitoring, and safety shut-off for natural, LP, and manufactured gas applications. It features a precise 30-second pre-purge and a 30-second inter-purge to clear the combustion chamber, followed by a 7-second trial-for-ignition (TFI) period. The Fenwal 35-60 Series technical design includes a conformal coating for moisture resistance and on-board LED diagnostics to streamline troubleshooting on the job site. This unit effectively replaces various Lennox 80K12 and 80K1201 part numbers, ensuring direct spark ignition reliability and flame rectification accuracy (0.7µA minimum) in demanding residential and commercial environments.
Key Benefits:
- Broad Compatibility: Drop-in replacement for Lennox 80K1201, 36G5701, and 98G2901 models.
- Advanced Diagnostics: Integrated LED indicator provides clear fault codes for rapid system analysis.
- Environmental Durability: Conformal coated PCB allows for stable operation in non-condensing environments up to 95% R.H.
- Safety Timing: Hard-coded 30-second inter-purge ensures safe lighting attempts during multi-trial sequences.
- Robust Operation: Designed to function in extreme ambient temperatures ranging from -40°F to +176°F (-40°C to +80°C).
Common Questions:
What is the necessary flame signal for the Fenwal 35-605903-223 to stay out of lockout?
The control requires a minimum flame sense current of 0.7 microamps. Technicians should use a DC microammeter at the FC terminals to verify the signal strength during the run cycle.
How do I reset the controller after an ignition lockout?
This Lennox Special control can be reset by cycling the thermostat call for heat or by removing 24VAC power at the TH/W terminal for a minimum of five seconds.
Does this unit support local or remote flame sensing?
This specific model is configured for local sense via the high voltage spark electrode; however, it is critical to verify the wiring schematic of the Series 35-60 unit being replaced to ensure proper S1 terminal grounding.
This item is not eligible for free shipping.
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.
