Damper Switch; Damper Failed To Open Alarm; Damper Failed To Close Alarm; Figure 49 Damper Blade Position - Bard MEGA-TEC W180B Service Instructions Manual

To view damper blade 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 I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Analog
Outputs; press ENTER key.
5. Press UP or DOWN keys to scroll to Analog Outputs
C4-1 (damper 1), Analog Outputs C4-2 (damper
2), Analog Outputs C4-3 (damper 3) or Analog
Outputs C4-4 (damper 4). See Figure 49.
FIGURE 49
Damper Blade Position
Manual 2100-749
Page 32 of 68

Damper Switch

The economizer utilizes three magnetic switches (one
on each damper blade) 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 Inputs;
press ENTER key.
5. Press UP or DOWN keys to scroll to Digital Ins C1-
2.
6. Reference the values for Damper 1, Damper 2,
Damper 3 and Damper 4 (see Figure 50).
7. 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 50
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.
The alarm must be cleared by a user reset.

Damper Failed to Close Alarm

When the controller commands the economizer damper
actuator to the 0% position and the damper switch
indicates the damper is not closed, after a delay of 300
seconds the controller will generate a damper failed to
close alarm. This alarm is just a notification and will
not disable any features on the controller.
The alarm must be cleared by a user reset.