3-O&M_Settings_r1r Section 3Page 37
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The DEV fan alarm is generally the most useful method for detecting fan failures when all fans are the
same size and operating at the same speed.
FAN ALRM = MIN. The alarm becomes active when the airflow rate falls below a user defined minimum
airflow rate.
FAN ALRM = %MAX. The alarm becomes active when the airflow rate falls below a user defined minimum
airflow percentage of the maximum airflow rate stored by the transmitter for each fan in the array.
Set the fan speed to maximum during setup to store the highest airflow rate for the %MAX fan alarm.
3.13.2. Action of Active Fan Alarm [ON ALRM]
Enable and select one of the fan airflow alarms.
[Menu path: SETTINGS >↓ FAN ALARM >↓ ON ALRM]
Default: KEEP
Optional Settings: IGNR
ON ALRM = KEEP. Use the airflow of the fan in active alarm to determine the total airflow rate for the fan
array.
ON ALRM = IGNR. Ignore (don’t’ use) the airflow of the fan in active alarm to determine the total airflow rate
for the fan array.
Note: Section 3.13.3. only applies when FA TYPE=MIN.
3.13.3. Fan Alarm Units of Measure [ALRM UM]
The airflow units of measure used to activate the fan airflow alarm.
[Menu path: SETTINGS >↓ FAN ALARM >↓ ALRM UM]
Default: FPM [m/s]
Optional Settings: CFM [L/s]
The area parameter(s) [AREA] of -F probe types must be entered (i.e. not equal to the factory default
value of {null}) for the LCD UM=CFM [L/s] option to be available. “ENTER AREA <OK>” will be
displayed when CFM [L/s] is selected. Press ENT or ESC to return to the “*ALRM UM=FPM [L/s]”
menu prompt.
3.13.4. Fan Alarm Setpoint [SETPNT]
3.13.4.1. DEV AND %MAX ALARMS
The setpoint, as a percentage of airflow, used to activate the fan airflow alarm.
[Menu path: SETTINGS >↓ FAN ALARM >↓ SETPOINT]
Default: 25%
Optional Settings: 10% to 100%
3.13.4.2. MIN ALARM
The airflow setpoint, in the specified units of measure, used to activate the fan airflow alarm.
[Menu path: SETTINGS >↓ FAN ALARM >↓ SETPOINT]