Economizer Alarms; Damper Failed To Close Alarm; Figure 2.35 Economizer Setup - Enthalpy Control; Figure 2.36 Economizer Setup - Temphum Control - Bard FUSION-TEC HR58APA Installation Support Materials

23. Press UP or DOWN keys to adjust the dew point
setpoint for economizer operation to the desired
value.
24. Press ENTER key to save the value and scroll to
Off Diff.
25. Press UP or DOWN keys to adjust the differential
where dew point no longer allows economizer
operation.
26. Press ENTER key to save the value and scroll to
parameter Delay.
27. Press UP or DOWN keys to adjust the delay
before the dew point consideration will allow the
economizer to operate.
28. Press ENTER key to save the value.
29. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 2.35
Economizer Setup – Enthalpy Control
See Table 2.4 for default settings for economizer
operation.
If the economizer is activated during a cooling call using
any of the previously mentioned modes, a 0-10v signal
will be sent to the actuator. The actuator will then open
and close the damper blades to maintain a mixed air
temperature of 55°F. When the mixed air temperature
increases the damper will open and when the mixed air
temperature decreases the damper will close.
Mode Consideration
Temperature
Humidity
Dew Point
* In Enthalpy mode, outdoor temperature, humidity and calculated dew point are all considered for economizer operation.
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The economizer may be disabled by the LV if the
system determines it needs to enter dehumidification
mode. More information about the dehumidification
sequence can be found on page 30 and in the LV
manual. In addition to dehum mode, the economizer
may be disabled for 30 minutes (adjustable) if the dust
sensor indicates the outdoor air is not acceptable for
cooling. After the time has expired and on a call for
cooling, the economizer will open again to sample the
air. The unit will either return to normal operation or
remain locked out for another 30 minutes.

Economizer Alarms

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.
To adjust the damper failed to close 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.
TABLE 2.4
Economizer Default Settings
Economizer Available for Cooling
When the outdoor air temperature
is below 70°F
LV Online: When the outdoor humidity
is below 80%
LV Offline: When the outdoor humidity
is below 60%
When the outdoor dew point
is below 55°F
FIGURE 2.36
Economizer Setup – TempHum Control
Economizer Not Available for Cooling
When the outdoor air temperature
is above 75°F
LV Online: When the outdoor humidity
is above 80%
LV Offline: When the outdoor humidity
is above 60%
When the outdoor dew point
is above 60°F