Damper Blade; Minimum Damper Position; Damper Switch; Damper Failed To Open Alarm - Bard FUSION-TEC WR36BPA Service Instructions Manual

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.

Minimum Damper Position

This unit has a minimum damper position feature to
vent the space and intake fresh air whenever the blower
is operating. This feature operates separately from free
cooling operation and minimum position should not
be set to a higher position than needed, as it is not
controlled by room or outdoor conditions. This feature
is disabled by default, but is available if needed.
To enable/disable/adjust the minimum damper position:
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 System Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Economizer
Setup A3.
5. Press ENTER key to scroll to Minimum Position
Enable (see Figure 50).
6. Press UP or DOWN keys to change ON or OFF
value.
7. Press ENTER key to save value and move the
cursor to Position.
8. Press UP or DOWN keys to adjust the minimum
position value.
9. Press ENTER key to save value.
10. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 50
Adjusting Minimum Damper Position

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.
5. Reference the value located at Damper row and Val
column (see Figure 51).
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 51
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 20 seconds 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.
Disabling the damper switch in I/O Config disables this
alarm.
To adjust the damper failed to open delay:
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
A4.
5. Press ENTER key to scroll to Open Delay (see
Figure 52 on page 32).
Manual 2100-695
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