Manual 2100-695C
Page
36 of 56
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).
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
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.
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.
FIGURE 58
Economizer Setup A3
TABLE 10
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
LC Online
: When the outdoor humidity
is below 80%
LC Online
: When the outdoor humidity
is above 80%
LC Offline
: When the outdoor humidity
is below 60%
LC 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
