![Fault Modes (cont’d)](/images/new-backgrounds/42041/4204143x1.webp)
20.Ignition System (cont’d)
Fault Modes (cont’d)
Lockout
21.Gas Valve
22.Fan Motor
If the gas valve was sensed as closed when it should be open, and has not de- energized after the venter motor was shutoff for 15 seconds, then the venter motor is
Soft Lockout - The control shall not initiate a call for heat or call for continuous fan while in lockout. The control will still respond to an open limit and undesired flame. Lockout shall automatically reset after one hour. Lockout may be manually reset by removing power from the control for more than one second or removing the thermostat call for heat for more than one and less than 20 seconds.
Hard Lockout - If the control detects a fault on the control board, the status LED will be
Power Interruption - During a momentary power interruption or at voltage levels below the minimum operating voltage (line voltage or low voltage) the system will
Power interruptions of less than 80mS shall not cause the control to change operat- ing states. Power interruptions greater than 80mS may cause the control to inter- rupt the current operating cycle and
The main operating gas valve is powered by the
WARNING: The operating valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting the unit to ensure positive closure. See Hazard Levels, page 2.
The fan motor is equipped with thermal overload protection of the automatic reset type. Should the motor refuse to run, it may be because of improper current char- acteristics. Make certain that the correct voltage is available at the motor.
NOTE: If the unit is equipped with an optional totally enclosed motor or optional voltage, the horsepower may be larger than the standard motor. Refer to the motor nameplate to verify horsepower.
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