4.Troubleshooting and System Detailed Diagnosis For ADC Direct Spark Ignition (DSI) Module P/N 128973

When the dryer calls for heat, 24 VAC from the step down transformer is applied to the “TH” and “GND” terminals of the DSI module. The DSI module light emitting diode (L.E.D.) indicator will LIGHT “RED” (for up to approximately 1.5-seconds [prepurge]) then the L.E.D. indicator will LIGHT “GREEN”; the gas valve will be energized, and the spark burst will be evident (on) for approximately 8-seconds at the tip of the electrode flame-probe assembly. Flame should now be established and confirmed. If a flame is not sensed and confirmed by the ignitor/flame-probe sensor after the approximate 8-second spark burst, the DSI module will go into the “LOCKOUT” mode and the L.E.D. will LIGHT “RED” CONTINUOUSLY. THERE ARE NO RETRIES. “Burner Ignition Control Fault” will display. To clear this fault press the “CLEAR/STOP” key.

If a flame has been established and confirmed and then lost, the DSI module L.E.D. indicator will continue to LIGHT “GREEN” and immediately a spark will be evident (on) for approximately 8-seconds. The flame should now be established and confirmed. If a flame is not sensed and confirmed by the ignitor/flame- probe sensor after the approximate 8-second spark burst, the DSI module will go into the “LOCKOUT” mode and the L.E.D. will LIGHT “RED” CONTINUOUSLY. THERE ARE NO RETRIES.

a. System Diagnosis

1) Gas Pressure

A gas pressure test should be taken at the gas valve pressure tap provided on every gas valve to assure that the water column (W.C.) pressure is correct and consistent.

There are two (2) types of devices commonly used to measure water column pressure. They are the spring and mechanical type gauge and the water column test gauge (manometer). The use of the spring and mechanical type gauge is not recommended because they are not always accurate. The preferred type of gauge is the manometer because it is a simple device to use and is highly accurate. A manometer is simply a glass or transparent plastic tube with a scale graduated in inches. When it is filled with water and pressure is applied, the water in the inner tube lowers, showing the exact water column pressure in inches.

WARNING: Test ALL connections for leaks by brushing on a soapy water solution.

WARNING: NEVER TEST FOR LEAKS

WITH A FLAME!!!

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ADC AD-200 service manual With a Flame
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AD-200 specifications

The ADC AD-200 is a high-performance analog-to-digital converter designed to meet the needs of a wide range of applications including industrial automation, instrumentation, medical devices, and consumer electronics. This converter is renowned for its combination of speed, precision, and reliability.

One of the standout features of the ADC AD-200 is its exceptional resolution. Offering up to 24 bits of resolution, it provides an outstanding level of detail and accuracy in signal conversion. This high resolution makes it ideal for applications where precision is paramount, such as in audio processing and sensitive measurements in scientific research.

The AD-200 operates at a maximum sampling rate of 1 Msps (mega-samples per second), allowing it to effectively capture fast-changing signals. This speed ensures that the converter can handle dynamic input signals without missing critical data points. Additionally, the device employs a pipelined architecture, which helps to maintain high throughput while keeping latency low—an essential characteristic for real-time applications.

Another critical aspect of the AD-200 is its low input noise and distortion levels. With a total harmonic distortion (THD) of less than 0.01%, the converter maintains signal integrity even when processing high-frequency signals. This feature is crucial in audio and instrumentation applications where signal clarity and fidelity are necessary.

The ADC AD-200 is equipped with advanced digital signal processing (DSP) capabilities, allowing users to perform filtering, averaging, and other signal conditioning tasks on the incoming data stream. This built-in processing capability means users can reduce the load on external processors, streamlining system designs and improving overall efficiency.

The device supports various input voltage ranges, which makes it versatile for multiple applications. It is compatible with single-ended and differential input configurations, providing flexibility for different circuit designs and requirements.

Connectivity features include both serial and parallel interfaces, offering easy integration into various systems. The ADC also comes with a robust software development kit (SDK) that provides necessary drivers and support to facilitate quicker implementation and system optimization.

In summary, the ADC AD-200 is a versatile, high-performance analog-to-digital converter marked by its high resolution, fast sampling rate, low noise levels, integrated DSP capabilities, and flexible connectivity options. These features make it a preferred choice for engineers and developers aiming for excellence in signal processing tasks across diverse industries.
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