Economizer; Economizer Components; Actuator; Dust Sensor - Bard FUSION-TEC HR35BPA Service Instructions Manual

FIGURE 42
Adjusting Low Pressure Alarm Settings

Economizer

Economizer Components

Actuator

The actuator rotates up to 90° based on a 2-10v signal
sent to it by the controller. The actuator is rated at
90 lb-in and is spring return when power is lost. This
component is what opens and closes the damper blade.
To verify the output from the controller to the actuator:
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 Damper Output
C13; press ENTER key.
5. Reference the Damper Position for the current
output to the damper (see Figure 43).
FIGURE 43
Damper Output
6. To override the current position, press ENTER key
to scroll to Damper OV Pos.
7. Press UP or DOWN keys to change the value to the
desired output.
8. Press ENTER key to save the value and move
cursor to Override.
9. Press UP or DOWN keys to change the value from
Off to On.
10. The Damper Position will update with the new
override value and the damper will travel to that
position.
NOTE: This override will last for 5 minutes or until the
Override is changed back to Disabled.

Dust Sensor

The unit has a dust sensor installed in the outdoor air
inlet next to the outdoor air sensor. The dust sensor
checks for excessive particulates in the outdoor air, and
will close the economizer if the dust is excessive. The
sensor uses a PWM signal converted to 0.1-5v output
to the controller.
To ensure proper performance, cleaning may be
required. Vacuuming or blowing any accumulated dust
out of 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
C7; press ENTER key.
5. Reference the Value for the current sensor reading
(see Figure 44).
NOTE: The sensor can be disabled if required for
troubleshooting.
6. With the cursor on the Enable parameter, press UP
or DOWN keys to change the value from On to Off.
7. Press ENTER key to save the value and move
cursor to next parameter (Offset).
8. To apply an offset to the current reading, press UP
or DOWN keys to adjust the value to the desired
value.
9. Press ENTER key to save the value.
FIGURE 44
Dust Sensor
Manual 2100-694B
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