Manual 2100-665G
Page
16 of 28
Free Cooling
If the unit is equipped with an economizer, and
conditions are acceptable for economizer operation,
the MULTI-TEC wall-mount unit will utilize free cooling
operation before the use of any cooling operation
requiring compressor operation to reduce the energy
required to cool the indoor space.
Economizer Disable
There are two methods to disable the economizer if
the use of free cooling is restricted. The first method is
to select None as the economizer type within the
Sys.
Config.
menu. The second method requires changing
the model number within the
Adv. Sys. Config.
menu
to reflect a model installed with a blank-off plate (see
model nomenclature in Figure 1 on page 3). Changing
the wall-mount unit model number to reflect a unit with
a blank-off plate will not allow for an economizer type
to be selected therefore defaulting to a disabled state,
along with all sensors/alarms associated with it.
Economizer Enable
The economizer will be enabled for cooling operation
if the model number reflects a wall-mount unit with an
economizer installed, an economizer type other than
None and the conditions for the economizer type are
met. The following list explains the economizer types
and the parameters required for operation:
None
Economizer will not be enabled for freecooling
operation.
Drybulb Only
1. Outdoor air temperature is below the Outdoor Set
outdoor temperature setpoint listed within the
Sys.
Config.
menu. (Outdoor Set temperature setpoint is
70°F by default.) See Figure 22.
2. LC6000 is not currently in any dehumidification
mode.
3. LC6000 is not currently in any emergency mode.
Temperature and Humidity (Default)
1. Outdoor air temperature is below the Outdoor Set
outdoor temperature setpoint listed within the
Sys.
Config.
menu. (Outdoor Set temperature setpoint is
70°F by default.) See Figure 22.
2. Outdoor relative humidity is below the OA Humid
Set outdoor humidity setpoint listed within the
Sys.
Config.
menu. (OA Humid Set humidity setpoint is
80% RH by default.) See Figure 22.
3. LC6000 is not currently in any dehumidification
mode.
4. LC6000 is not currently in any emergency mode.
FIGURE 22
Economizer A4 Screen
FIGURE 23
Economizer A5 Screen
Enthalpy
1. Outdoor air temperature is below the Outdoor Set,
outdoor temperature setpoint, listed within the
Sys.
Config.
menu. (Outdoor Set temperature setpoint is
70°F by default.) See Figure 22.
2. Outdoor relative humidity is below the OA Humid
Set outdoor humidity setpoint listed within the
Sys.
Config.
menu. (OA Humid Set humidity setpoint is
80% RH by default.) See Figure 22.
3. The outdoor air dewpoint is below the OA Dew
Pt Set outdoor dewpoint setpoint, listed within
the
Sys. Config.
menu. (OA Dew Pt Set dewpoint
setpoint is 55°F by default.) See Figure 23.
4. LC6000 is not currently in any dehumidification
mode.
5. LC6000 is not currently in any emergency mode.
Economizer Modulation
The economizer damper output will modulate
between 0% and 100% to maintain a 55°F mixed
air temperature when the outdoor air conditions are
acceptable.
To adjust damper modulation values:
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.
Содержание MULTI-TEC W18AAPA
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