Figure 58 Economizer Setup A3 - Bard FUSION-TEC WR35BPA Service Instructions Manual

9. Press UP or DOWN keys to change the parameter
to the desired value.
10. Press ENTER key to save the value and scroll to
the next parameter.
11. Press UP or DOWN keys to change the (outdoor
temperature) Off Diff parameter to the desired
value.
12. Press ENTER key to save the value and move to the
next parameter.
13. If control type is TempHum or Enthalpy, the cursor
should now be on Humidity Set parameter.
14. Press UP or DOWN keys to change the parameter
to the desired value.
16. Press UP or DOWN keys to change the (outdoor
humidity) On Diff parameter to the desired value.
17. Press ENTER key to save the value and move to the
next parameter.
18. If control type is Enthalpy, the cursor should now
be on Dew Pt Set parameter.
19. Press UP or DOWN keys to change the parameter
to the desired value.
20. Press ENTER key to save the value and move to the
next parameter.
21. Press UP or DOWN keys to change the (outdoor
dew point) On Diff parameter to the desired value.
22. Press ENTER key to save the value.
To change economizer settings:
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 Economizer
Setup A3.
5. Press ENTER key to scroll to Mixed Air Temp (see
Figure 58).
Mode Consideration
Temperature
Humidity
Dew Point
* In Enthalpy mode, outdoor temperature, humidity and calculated dew point are all considered for economizer operation.
Manual 2100-695C
Page 36 of 56
6. Press UP or DOWN keys to change the parameter
to the desired value.
7. Press ENTER key to save the value and move to the
next parameter.
8. Press UP or DOWN keys to change the
(economizer) Delay parameter to the desired value.
9. Press ENTER key to save the value.
10. Press ESCAPE key several times to return to Main
Menu screen.
NOTE: The economizer delay parameter adjusts the
See Table 10 for default settings for economizer
operation.
When the economizer is activated during a free cooling
call only, using any of the previously mentioned modes,
a 0-10v analog signal will be sent to the economizer
actuator. The actuator will then open and close the
damper blades to maintain a supply air temperature of
55°F. If the economizer is active during optimized cooling
mode, the actuator will maintain a mixed air temperature
of 55°F. When the supply/mixed air temperature
increases, the damper will open and when the mixed air
temperature decreases, the damper will close.
TABLE 10
Economizer Default Settings
Economizer Available for Cooling
When the outdoor air temperature
is below 70°F
LC Online: When the outdoor humidity
is below 80%
LC Offline: When the outdoor humidity
is below 60%
When the outdoor dew point
is below 55°F
FIGURE 58
Economizer Setup A3
time the OD Temp Set, Humidity Set and Dew Pt
Set measurements (found on screen A2) can be
outside of the disabling parameters before the
economizer operation is disabled.
Economizer Not Available for Cooling
When the outdoor air temperature
is above 75°F
LC Online: When the outdoor humidity
is above 80%
LC Offline: When the outdoor humidity
is above 60%
When the outdoor dew point
is above 60°F