Page 40 AD Series Dehumidifying Dryers5-10 Redundant Safety Controller DisplayOptionalThe Redundant Safety Controller limits the process air temperaturefrom exceeding the upper temperature range set by the E5CNTemperature Controller. Standard AEC dryers use amicroprocessor-based controller for limiting the process airtemperature. The controller is a modular, self-contained unitremovable from the mounting housing. All parameters are factoryset and adjusted; normally, no field adjustment to the internalcontrols are necessary.Figure 10Typical Redundant Safety Controller Display5-11 Setting the Redundant Safety ControllerThe Redundant Safety Controller alarm setting is changed bypressing the up and down keys to input the alarm value. The upperdisplay reading indicates the Process Value, while the lowerdisplay indicates the High Point Setting alarm value. The factorysetting for the High Point Alarm Value (L1-hi ) is 150°F (-23°C).5-12 Restoring the WATLOW Redundant SafetyController to Factory SetupIf the preset parameters on the controller have been tampered withand it no longer functions properly, call the Service Department atAEC. This controller is not meant to be modified.
