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DN-Series Integrated Programmable Controls
DOAS
84
TROUBLESHOOTING
10.1.5.3 Airflow Condition Alarms
NUMBER
NAME
STATUS SHOWN
MEANING
12
Al_SA_Airflow
Auto reset
Supply Airflow Alarm
13
Al_EA_Airflow
Auto reset
Exhaust Airflow Alarm
14
Al_SA_StaticPress
Auto reset
SA Static Pressure Level Alarm
15
Al_CO2
Auto reset
CO2/VOC Level Alarm
16
Al_SupAir_Low_
Temp_Warn
User reset
Low SA Temp Warning
17
Al_SupAir_Low_
Temp_Alarm
User reset
Low SA Temp Shutdown
18
Al_SupAir_Hi_Temp_
Warn
User reset
High SA Temp Warning
19
Al_SupAir_Hi_Temp_
Alarm
User reset
High SA Temp Shutdown
21
Al_EA_StaticPress
Auto reset
EA Static Pressure Level Alarm
Alarm Number 12:
Supply Airflow Alarm
This alarm occurs when the supply is set to control on supply flow (CFM). It indicates that the
flow measured is out of tolerance set here for more than the alarm delay set here.
This usually indicates that the unit is probably hunting and the KP (gain) for the PI control needs
to be adjusted. Set the KP to 0.1 or 0.2 to start. If it responds too slow, you can increase it but
these values are usually acceptable.
Alarm Number 13:
Exhaust Airflow Alarm
This alarm occurs when the supply is set to control on exhaust flow (CFM). It indicates that the
flow measured is out of tolerance set here for more than the alarm delay set here.
