Onsite incinerators are frequently operated automatically from ignition to burndown (see Figure 10.11.5). The cycle is started by the microswitch on the charging door, which automatically starts the secondary burner, the water flow to the scrubber, and the induced-draft fan. When the door is closed, the primary burner is started and stays on for an adjustable time of up to an hour or until the door is reopened. Unless interrupted by a high-temperature switch, the secondary burner stays on for up to five hours. To provide each charge with the same preset burn-down protection, the secondary burner timer is reset every time the charging door opens. Both burners have overtem-perature and flame-failure safety controls. Also, a separate cycle timer controls the induced-draft fan and scrubber water flow to guarantee airflow and scrubbing action during

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