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Dust Sensor Failure Alarm
When the sensor reads a value that is outside of
the acceptable 0 to 100% range, an alarm will be
generated indicating the sensor has failed. This alarm
is just a notification and will not disable any other
features on the controller.
This alarm is fixed and cannot be adjusted.
High Dust Limit Alarm
When dust content in the air is high and is a risk
to prematurely reducing airflow through the filters,
the unit will restrict the use of the economizer. The
controller has adjustable software setpoints to indicate
dust levels are too high and to disable the economizer
operation for 5 minutes. Once the conditions are no
longer present, the alarm will automatically clear.
To adjust the dust sensor alarm setpoint:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to System Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Dust
Configuration A4.
5. Press ENTER key to scroll to Alarm Set (see
Figure 47).
6. Press UP or DOWN keys to change to the desired
value.
7. Press ENTER key to save the value.
NOTE: When the temperature outside is measured
at or below 0°F, the dust sensor alarm will be
disabled to allow economizer operation.
Adjusting Dust Sensor Alarm Setpoint
Damper Blade
The system utilizes four damper blades to bring in
outdoor air and exhaust space air for economizer
operation. Damper 1 is left intake, damper 2 is left
exhaust, damper 3 is right intake and damper 4 is right
exhaust (see Figure 48). Damper blades are made of
sheet metal and are integrated into the equipment.
FIGURE 48
W180 Damper Blades
FIGURE 47
Manual
2100-749
Page
31 of 68
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Troubleshooting
