Black Box CRDX-A-FS-24KW, CRDX-W-FS-12KW Alarm Log, Non-Critical Alarms, E2 Controller, Page

Chapter 4: E2 Controller

4.5.3 Alarm Log

Figure 4-23. Alarm Log screen.

No password is required to view alarm display messages. If an alarm condition occurs, the first active alarm may be displayed by pressing the key. The alarm screen display text message will remain unchanged until the alarm condition is cleared.

If the alarm log is entered from the main menu, any other active alarm message(s) may be viewed by using the Up and Down arrow keys to scroll through alarm messages.

4.5.3.1 Alarms

The red LED backlight within the alarm key will illuminate any time an alarm condition is present or previous alarms existed without having been reset or cleared. An audible alarm will also activate when an alarm condition occurs. The audible alarm may be enabled or disabled in the Service>Options menu loop. The first active alarm screen may be displayed by pressing the Alarm key. The Alarm display provides you with a text message describing the abnormal operating condition. Use the Up and Down arrow keys to scroll for any additional alarm messages. Only active alarm screens will be displayed when the Alarm key is pressed. The alarm screen display will remain unchanged until the alarm condition is corrected and the alarm key is pressed again to clear the alarm.

When access is gained to the Alarm Log loop, use the Up and Down arrow keys to scroll through the log for a history of alarm messages. The alarms log may be cleared in the Service>Alarm log menu loop.

The application software supports two types of alarms: “Non-Critical” and “Critical.” Any alarm may be programmed to activate the “Custom” (user-configured) alarm relay contacts.

4.5.3.2 Non-Critical Alarms

A non-critical alarm will activate the alarm screen that it is associated with. These alarms are programmed to activate the “Summary Fault” alarm and close the “Summary Fault” relay contacts without stopping unit operation.

Some examples of the factory programmed, non-critical alarms are:

• High Temperature	• Moisture Detection
• Low Temperature	• Change Filter
• High Humidity	• Sensor Failure
• Low Humidity	• Communication Failure

4.5.3.3 Critical Alarms

Critical alarms will coincide with automatic shutdown of the A/C unit(s) equipment as needed to prevent possible system damage. The A/C unit(s) equipment will remain shut down until the alarm condition(s) are no longer sensed and the controller has been reset.

Some examples of critical alarms are:
• No Airflow (Air-Proving Switch)	• High Head Pressure
• Fire/Smoke Detection	• Low Suction Pressure

• Off by Internal Alarm (Only for grouped systems)

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