Manual 2100-670I
Page
29 of 47
To ensure proper performance, cleaning may be
required. Vacuuming or blowing the dust off the sensor
with forced air is recommended.
Avoid inserting any
objects into the sensor
.
The dust sensor can be verified by:
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
Dust Sensor
(C8)
; press ENTER key.
5. Reference the
Value
for the current sensor reading
(see Figure 45).
6. To apply an offset to the current reading, press
ENTER key to scroll to
Offset
.
7. Press UP or DOWN keys to adjust the value to the
desired value.
8. Press ENTER key to save the value and move
cursor to next parameter.
NOTE:
The sensor can be disabled if required for
troubleshooting.
9. With the cursor on the
Enable
parameter, press
UP or DOWN keys to change the value from
ON
to
OFF
.
10. Press ENTER key to save.
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
FIGURE 45
Dust Sensor
controller has adjustable software setpoints (default to
80%) to indicate dust levels are too high and to disable
the economizer operation for 5 minutes (unit default).
This alarm is not communicated to the NOC. Once
the conditions are no longer present, the alarm will
automatically clear.
Disabling the dust sensor in
I/O Config
disables this
alarm.
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
46).
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.
FIGURE 46
Adjusting Dust Sensor Alarm Setpoint
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.
