Emerson Liebert iCOM, Manual

Page: 154 / 172

Service Menu Parameters
Liebert
®
iCOM
®
for Liebert DSE
™
146
8.8 Service-Economizer Menu Screens
Economizer provides advanced air side Economizer monitoring and parameter adjustment
Figure 131 Economizer, page 1 of 3
SA02 Enable Economizer —Sets the Liebert Air Economizer
™
operation to one of the following
modes. These selections only determine if the Liebert Air Economizer is available for use; they do not
determine or override damper position. Damper position is always controlled by the sensor set to
control temperature (i.e., Return / Supply Sensor)
• Yes : This parameter will operate the Liebert Air Economizer based on the outdoor sensor reading
and will allow the Liebert iCOM to determine if the conditions are within the acceptable range of
operation.
• NO : This parameter will disable the Liebert Air Economizer and will not allow Liebert Air
Economizer to operate even if the outdoor conditions are acceptable.
• Remote : This parameter will enable the Liebert Air Economizer and ignore the outdoor Liebert
iCOM sensor even if the conditions are outside the range of operation.
SA04 Humidity Ratio —Sets the minimum and maximum limits of outdoor air based on the amount
of moisture content. The humidity ratio is set based on pounds of moisture per pound of dry air. This
is equivalent to the dew point temperatures.
SA05 Wet Bulb Temp —Read-only value that displays the outdoor wet bulb temperature. (This
reading will be in metric values.)
SA06 Outdoor Temp —Displays the actual outdoor temperature based on the Temperature
Humidity sensor (Sensor C). When this parameter shows OK, the outdoor temperature requirements
have been met to use economization. When NOK is shown, the outdoor temperature is outside the
operating range set in the Liebert iCOM control.
SA07 Stop ECO at Se —Sets the temperature when the Liebert Air Economizer will be
disabled due to an increasing outdoor air temperature. This parameter is added to the return air
sensor setpoint and then compared to the outdoor temperature reading. If the outdoor temperature
reading exceeds the return air temperature setpoint plus this parameter, the Liebert Air Economizer
will be disabled. This is factory-set at 20°F (-6.7°C).
SA08 Economizer Mode —Displayed when the Liebert Air Economizer is available for use.
SA09 Dew Point (calculated) —Displays the actual outdoor dew point based on the outdoor sensor.
SA10 Economizer Override At —Sets the indoor temperature when the Liebert Air Economizer ™
will be locked out. Even when all other parameters are satisfied, the Liebert Air Economizer will be
locked out when the return air temperature sensor reads this value.
SA11 Delay After Fan Start —Sets the delay from the time the unit has been started until the
ECO EMERGENCY OVERRIDE can be triggered. This allows airflow to pass over the sensors to get
an accurate reading before any emergency modes are activated.