Lennox SureLight 18M3401
Manuals and User Guides for Lennox SureLight 18M3401. We found 1 manuals for free downloads Service manual
SureLight 18M3401, SureLight 46M9901, SureLight 18M9901, SureLight 49M5901, SureLight 100869, SureLight 100870 are two stage SureLight ignition systems that consist of a Lennox control board and hot surface ignitor. These boards control all major furnace operations.
Key Features
Two Stage Operation
Variable Speed Operation
Electronic Ignition
Diagnostic LEDs
Dip Switch Settings
Flame Sensor
Ignitor
Pages: 44 Lennox SureLight 18M3401 Service manual
Brand: Lennox Category: Heat pumps Size: 698 KB
Languages: English
Open manualFrequently Answers and Questions
What is the SureLight ignition system?
The SureLight ignition system is a two-stage system that consists of a Lennox control board and hot surface ignitor. It controls all major furnace operations, including the combustion air inducer, the ignitor, and the gas valve.
How does the SureLight ignition system work?
The SureLight ignition system works by monitoring the first and second stage combustion air inducer prove switch. Once the prove switch is determined to be open, the combustion air inducer is energized on low (first stage) heat speed. The ignitor warms up and the gas valve opens for a trial for ignition. If ignition is not proved, the control will try four more times with an inter purge and warm-up time between trials.
What are the diagnostic LEDs used for?
The diagnostic LEDs are used for troubleshooting. They flash in patterns that correspond to the codes detailed in table 5.
How do I adjust the fan off delay?
You can adjust the fan off delay by flipping the dip switches 1 and 2 (for boards 18M3401 and 46M9901) or switches 3 and 4 (for boards 100869 and 100870).
How do I determine the second stage on delay?
The second stage on delay is determined by the dip switch 3 (for boards 18M3401 and 46M9901) or switch 1 (for boards 100869 and 100870).
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