Dust Sensor Failure Alarm; High Dust Limit Alarm; Damper Blade; Damper Switch - Bard FUSION-TEC HR35BPA Service Instructions Manual

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 clog the filters, the unit will restrict the
use of the economizer for a set period of time. The
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
45).
FIGURE 45
Adjusting Dust Sensor Alarm Setpoint
6. Press UP or DOWN keys to change to the desired
value.
7. Press ENTER key to save the value and scroll to
Delay.
8. Press UP or DOWN keys to change to the desired
value.
9. Press ENTER key to save the value and scroll to
Disable Time.
10. Press UP or DOWN keys to change to the desired
value.
Manual 2100-694B
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11. 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 could be disabled
below 0°F by configuration 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 C1; press ENTER key.
5. Reference the value located at Damper row and Val
column (see Figure 46).
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 46
Damper Switch

Damper Failed to Open Alarm

When the controller commands the economizer damper
actuator to a position other than 0% and the damper
switch indicates the damper is not open, after a delay
of 60 seconds (unit default) the controller will generate
a damper failed to open alarm. This alarm is just a
notification and will not disable any features on the
controller.