Bard FUSION-TEC HR58APB, Service Instructions Manual

Page: 28 / 32

Manual 2100-670
Page 28 of 32
(see Figure 41). The following menu shows
the Enthalpy content which also contains
parameters that would be shown on TempHum .
18. Press ENTER key to scroll to OA Humid Set (see
Figure 40).
19. Press UP or DOWN keys to change the humidity
setpoint to desired value.
20. Press ENTER key to save the value and scroll to
W/O LV Set .
21. Press UP or DOWN keys to change the humidity
setpoint for stand alone mode to desired value.
22. Press ENTER key to save the value and scroll to OA
Dew Pt Set .
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.
See Table 9 for default settings for economizer
operation.
FIGURE 40
Economizer Setup – Enthalpy Control
FIGURE 41
Economizer Setup – TempHum Control
TABLE 9
Economizer Default Settings
* In Enthalpy mode, outdoor temperature, humidity and calculated dew point are all considered for economizer operation.
Mode Consideration Economizer Available for Cooling Economizer Not Available for Cooling
Temp
Only
Temp & Humidity
Enthalpy*
Temperature
When the outdoor air temperature
is below 70°F
When the outdoor air temperature
is above 75°F
Humidity
LV Online : When the outdoor humidity
is below 80%
LV Online : When the outdoor humidity
is above 80%
LV Offline : When the outdoor humidity
is below 60%
LV Offline : When the outdoor humidity
is above 60%
Dew Point
When the outdoor dew point
is below 55°F
When the outdoor dew point
is above 60°F
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.