Manual 2100-670
Page
24 of 32
FIGURE 31
Dust Sensor
Dust Sensor Failure Alarm
When the sensor reads a value that is outside of the
acceptable 0 to 100% RH 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.
Dust Limit Alarm
The controller has adjustable software setpoints
(default to 80%) to indicate dust levels are too high
and disable the economizer operation for 30 minutes.
This alarm is not communicated to the NOC. 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
Alarm Setup
(A9)
; press ENTER key.
5. Press ENTER key to scroll to
Setpoint
(see Figure
32).
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. This
is done because the compressor is disabled
below 0°F and the system would not have the
capability to cool.
Damper Blade
The system utilizes three damper blades used to bring
in outdoor air and exhaust space air for economizer
operation. The damper blades are made of sheet metal
and are integrated into the equipment.
Damper Switch
The economizer utilizes a magnetic switch to determine
if the damper is operating correctly. This switch will be
closed when the damper is closed and open when the
damper is open.
To verify the status of the switch:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to
I/O Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Digital In
Config (C2)
; press ENTER key.
5. Reference the value located at
6
Damp
row and
Val
column (see Figure 33).
6. The input will display
ON
when the damper is
closed (reflecting closed circuit on damper switch)
and will display
OFF
when the damper is open
(reflecting open circuit on damper switch).
FIGURE 32
Adjusting Dust Sensor Alarm Setpoint
FIGURE 33
Damper Switch
