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DN-Series Integrated Programmable Controls
DOAS
80
10.0 ALARMS AND TROUBLESHOOTING
If the problem is caused by an alarm, the first step in troubleshooting is to view the Alarm
screens. Press the Alarm button on the face of the controller to see all current alarms and what
function or component is causing the alarm. In some cases, the Alarm pre-set may need to be
adjusted or an offset may need to be changed. Before making any changes to the controller
programming, be certain to have an updated Backup file so that current settings can be easily
restored, if needed. See the following
Alarms
section for these.
Problems with an air handler are sometimes strictly mechanical, in which a fan or damper or
some other component simply stops working. Mechanical problems are easily traced to specific
components by using the Test End Device feature in the service level. See the following
Test
End Devices
section for this.
In other cases, problems may be caused by the air handler trying to overcome a pre-set or
operating parameter that has been set by the user. In these cases, view the controller screens
to trace the problem. See
Other Common Problems
section for these.
10.1 ALARMS
The alarms are viewed through the controller screen or through the BMS.
10.1.1 Acknowledging Alarms
When an alarm occurs, you will hear a buzzer sound and the alarm light will flash. Press the
alarm button to acknowledge the alarm and quiet the buzzer.
10.1.2 Viewing Alarms and Alarm Log
If there are active alarms the alarm button will be red. To view the active alarms, press the
alarm button. Each alarm has an alarm number (AL*11, in this case), a time stamp, and a
message to show which alarm occurred.
Continue to press the button to cycle through all active alarms. At the end you will see this
screen. Here you can press “ENTER” to see the past alarms.
TROUBLESHOOTING