Manual 2100-670I
Page
33 of 47
6. Press UP or DOWN keys to change the
Type
desired value to
None
,
Dry Bulb
,
TempHum
or
Enthalpy
.
7. Press ENTER key to save the value and scroll to
the next parameter.
NOTE:
The following parameters are for the temperature
consideration for economizer use. Applies to
Dry
Bulb
,
TempHum
and
Enthalpy
type.
8. The cursor should now be on the
Outdoor Set
parameter.
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. The cursor should now be on
Off Diff
parameter.
12. Press UP or DOWN keys to change the parameter
to the desired value.
13. Press ENTER key to save the value and move to
the next parameter.
14. The cursor is now on the
Mixed FC Set
parameter.
15. Press UP or DOWN keys to change the parameter
to the desired value.
16. Press ENTER key to save the value.
17. Press the DOWN key to navigate to the
A3
screen.
NOTE:
This screen will not display if economizer mode is
set to
Dry Bulb
or
None
. Also, the contents of the
screen will change when type is set to
Enthalpy
(see Figure 54) as compared to when type is set
to
TempHum
(see Figure 58 on page 34). 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 55).
19. Press UP or DOWN keys to change the humidity
setpoint to desired value.
20. If set to
TempHum
, continue on to Step 22. If set
to
Enthalpy
, press ENTER key to save the value
and scroll to
OA Dew Pt Set
.
21. Press UP or DOWN keys to adjust the outdoor dew
point setpoint for economizer operation to the
desired value.
22. Press ENTER key to save the value and scroll to
On
Diff
.
23. Press UP or DOWN keys to adjust the outdoor
humidity differential for which the economizer is
re-enabled.
24. Press ENTER key to save the value and scroll to
parameter
Delay
.
25. Press UP or DOWN keys to adjust the time the
actual measurements can be outside of the
disabling parameters before the economizer
operation is disabled.
26. Press ENTER key to save the value.
27. Press ESCAPE key several times to return to Main
Menu screen.
See Table 8 on page 34 for default settings for
economizer operation.
When the economizer is activated during a freecooling
call only, using any of the previously mentioned modes,
a 0-10v analog signal will be sent to the economizer
actuator. Regardless of economizer only, or optimized
cooling mode, the actuator will then open and close the
damper blades to maintain a supply air temperature of
55°F. During optimized cooling mode, the damper blades
will be limited to a max output of 60%. When the supply/
mixed air temperature increases, the damper will open
and when the mixed air temperature decreases, the
damper will close.
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 15 and in the latest revision of
LV1000 Service Instructions 2100-673. In addition
to dehum mode, the economizer may be disabled for
5 minutes (adjustable) if the dust sensor indicates
the outdoor air may cause particulate buildup in the
FIGURE 54
Economizer Setup – Enthalpy Control
FIGURE 55
Economizer Setup – TempHum Control
