Freecooling; Figure 2.13 Economizer A4 Screen; Figure 2.14 Economizer A5 Screen - Bard MULTI-TEC W18AAPA Installation And Service Instructions Manual

Freecooling

Economizer Enable
The model number is used to determine if an
economizer is installed. If an economizer is not
installed, this feature will be disabled and sensors will
be turned off that are not installed.
The economizer will be enabled for cooling operation
if the following conditions are true: (screens available
through Sys Config in Main Menu)
To navigate to the Economizer A4 screen (Figure 2.13)
and Economizer A5 screen (Figure 2.14):
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 Sys Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Economizer
(A4) or Economizer (A5); press ENTER key.
5. Press ENTER key to scroll to Type.
6. Press UP or DOWN keys to change Type to
Drybulb, Temperature and Humidity or Enthalpy.
7. To change the outdoor setpoint for economizer
operation, press ENTER key to scroll to Outdoor
Set.
8. Press UP or DOWN keys to change the temperature
to the desired value.
9. Press ENTER key to scroll to On Diff.
10. Press UP or DOWN keys to adjust value. NOTE:
This value is the differential on for the outdoor
setpoint. This value is how many degrees above the
setpoint that the economizer will be enabled when
the economizer is disabled. The outdoor setpoint
is when the economizer will be disabled when the
economizer is active.
11. Press ENTER key to scroll to OA Humid Set.
12. Press UP or DOWN keys to adjust value.
13. Press ENTER key to scroll to OA Dew Pt Set.
14. Press UP or DOWN keys to adjust value.
15. Press ENTER key to scroll to On Diff.
16. Press UP or DOWN keys to adjust value. NOTE:
This value is the differential on for the outdoor air
dewpoint setpoint. This value is how many degrees
above the setpoint that the economizer will be
enabled when economizer is disabled. The outdoor
air dewpoint setpoint is when the economizer will
be disabled when the economizer is active.
17. Press ENTER key to scroll to Dewpoint Delay.
18. Press UP or DOWN keys to adjust value. NOTE:
This is a delay before the economizer will be
enabled based on dewopint. This time must expire
FIGURE 2.13
Economizer A4 Screen
FIGURE 2.14
Economizer A5 Screen
and the dewpoint must be above the setpoint plus
on differential value for the dewpoint portion of
economizer to be approved.
None
Economizer will not be enabled.
Drybulb Only
1. Outdoor air temperature is below 70°F (Outdoor
Set on display). See Figure 2.13.
2. LC6000 is not currently in Dehum Mode.
Temperature and Humidity (Default)
1. Outdoor air temperature is below 70°F (Outdoor
Set on display).
2. Outdoor relative humidity is below 60% (OA
Humid Set on display) without LC indoor zone
humidity sensor or 80% (OA Humid Set on display)
with LC indoor humidity sensor (see Figure 2.13).
3. LC6000 is not currently in Dehum Mode.
Enthalpy (Temperature, Humidity and Dewpoint)
1. Outdoor air temperature is below 70°F (Outdoor
Set on display).
2. Outdoor relative humidity is below 60% (OA
Humid Set on display) without LC indoor humidity
sensor or 80% (OA Humid Set on display) with LC
indoor humidity sensor (see Figure 2.13).
Manual 2100-665A
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