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DN-Series Integrated Programmable Controls
DOAS
An alarm log screen looks like this. If the event is Stop, it shows the time that the alarm went
away. If the event is Start, it shows the time that the alarm first occurred. There may be up to
50 entries.
If no alarms are active, the screen will say No Alarms but you can still press “ENTER” to view
the last 50 alarm occurrences.
10.1.3 Resetting Alarms
If you cycle through the alarms, you will see this screen. At this time, you can hold the alarm
button down to reset the “User Reset” alarms. (The auto reset alarms reset themselves.)
10.1.4 Alarm Digital Outputs
The controller includes a digital output for remote indication of an alarm condition.
The first is AlarmOut.val and it closes the contact if there is an alarm that will shut down the
unit. These include:
u
Low Supply Temperature Alarm
u
High Supply Temperature Alarm
u
Loss of communication between the controller and the expansion module
u
Exhaust Fan Alarm (Failure to start)
u
Supply Fan Alarm (Failure to start) ONLY IF the
SF Alarm Unit Run?
is set to No. If yes, the
unit will not shut down and the exhaust fan will be allowed to continue to run. All heating and
cooling functions will be locked out, however.
TROUBLESHOOTING
