Pressura RPM10 Operation And Service Manual page 34

7. The display can only show one alarm message. Therefore, the monitor has an alarm priority system, with the highest priority alarm being
displayed. If multiple alarms exist, the lower priority alarms will not display until after the highest priority alarm has been eliminated. The
alarm priority is as follows:
Room 1 pressure sensor – low alarm
Room 1 pressure sensor – high alarm
Room 1 – minimum exhaust flow
Room 1 – minimum supply flow
Room 1 – temperature alarms
Room 1 – relative humidity alarms
Room 1 – supply venturi (low static pressure) alarm
Room 1 – exhaust venturi (low static pressure) alarm
Anteroom pressure sensor – low alarm
Anteroom pressure sensor – high alarm
Room 2 pressure sensor – low alarm
Room 2 pressure sensor – high alarm
Room 1 – supply airflow-proving switch
Room 1 – exhaust airflow-proving switch
8. The low and high alarms are absolute values. The chart below shows how the values must be programmed in order to operate correctly.
-0.2 inches H O
2
Min Transducer Reading
(maximum negative)
High
Negative
Alarm
The value of each setpoint or alarm is unimportant (except for small dead band) in graph above. It is important to understand that the high
alarm is a greater negative (positive) value than the low alarm.
Low
Negative
Alarm
+0.2 inches H
Max Transducer Reading
(maximum positive)
Low High
Positive Positive
Alarm Alarm
O
2