American Dryer Corp AD-200 Direct Spark Ignition DSI Troubleshooting Terms definitions

1. Direct Spark Ignition (DSI) Troubleshooting Terms (definitions)

a. DSI MODULE "RED" L.E.D. INDICATOR LIGHT - this "red" L.E.D. (liquid emitting diode) light is located in the upper right corner of the DSI module (refer to the top illustration on page 12). This is a diagnostic indicator that simplifies the operational and troubleshooting procedures of the DSI system.

b.LOCK-OUT MODE - DSI module "red" L.E.D. indicator light stays on continuously. This indicates there is a system fault and most likely the fault is the DSI module itself.

c.FLAME-OUT -burner flame shut down by the DSI module due to lack of flame verification. This condition occurs only after ignition is evident but is lost. The DSI system will immediately attempt to relight the burner.

d.RECYCLE - flame has been sensed but lost. Initiate a new sequence (THERE ARE NO RETRIES).

2.Troubleshooting and System Basic Diagnosis

a.Preliminary Steps

The following steps must be preformed to minimize the time required to isolate cause of fault.

1)DSI module L.E.D. indicator light is off (no "red" light or no "green" light).

a) Check for voltage (approximately 24 VAC) across the

DSI model terminals "TH" and "GND...

If voltage (approximately 24 VAC) is evident, then, there is a malfunction within the DSI module itself, and it must be replaced.

If there is no voltage, and then problem is not the DSI module or the ignition system, then the problem else- where in the dryer (i.e., dryers' heat circuit [sail switch, hi-limit circuits, etc.]).

2)DSI module L.E.D. indicator lights "red" for approximately 1.5 seconds (prepurge). This indicates that ALL the controls (including ALL the safety circuits) are functioning and power is being supplied to the DSI module.

a)DSI module L.E.D. indicator lights "green." This indicates a normal heating cycle. This also indicates that the preliminary diagnostics of the module has confirmed that the DSI module is functional.

b)DSI module L.E.D. indicator lights "red" continuously... LOCK OUT MODE. This indicates that there is a system fault and most likely the fault is internal to the DSI module. To make sure, open and close the main door. Restart the dryer ... if the module LOCKS-OUT ("red" L.E.D. indicator light stay on continuously) again, replace the DSI module.

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