Figure 85 Setpoints Screen - Emerson Liebert iCOM Manual

S132 Dehum Reheat/LL Sensor/Set—Sets the sensor and temperature start point that the reheat
will be deactivated and dehumidification will be stopped due to overcooling the space in a call for
dehumidification.
S133 Dehum Low Limit 1 LL1/LL2—Dehum Low Limit 1; Dehum Low Limit 2.
S134 Dehum Reheat Prop Band2—Sets the reheat proportional band for reheat operation
independently of the temperature proportional band. This parameter can be used to activate the
reheats at different points below the temperature setpoint.
S135 Estimated Aisle Temp—Sets an estimated cold aisle temperature when humidity control
sensor is set to remote and no remote temp sensors are installed at the unit. This estimated
temperature will be used to determine the humidity versus using an actual temperature in the cold
aisle that may fluctuate during modes of dehumidification or load changes of the IT equipment. This
provides a stable control point to reference the actual measured dew point from the return sensor.
Figure 85 Setpoints screen, page 4 of 9
S135 DT1 (Room/Outdoor) Type—Sets the activation point of the ambient dry bulb outdoor
temperature as it relates to either an indoor actual temperature or temperature setpoint. See 8.8 -
Service-Economizer Menu Screens for more information.
S136 DT1 (Room/Outdoor) Value—Field-adjustable setpoint or temperature. Type (setpoint or
temperature) is based on the setting on S135.
S137 DT2 (Room/FC Fluid) Type—Determines the method to activate the water circuit on
Dual-Cool and free-cool units. It may be set to CONTACT, TEMP or SET. CONTACT which uses a
dry contact to activate the free-cooling circuit. TEMP uses a sensor reading that can then be
compared to the return temp to see whether free-cooling is possible. SET compares the temperature
SET to the free-cooling sensor to determine free-cooling availability.
S138 DT2 (Room/FC Fluid) Value—Sets the delta between the actual temperature and fluid
temperature that must be met before free-cooling will occur.
Example: Actual Temperature = 75°F
Free-cooling Temperature = 70°F
DT2 Value = 4
Since the difference between the free-cooling fluid and the actual temperature is 5°F and the DT2
value is set to 4°F, then free-cooling would be utilized.
S139 Minimum CW Temp—Enables the temperature at which free-cooling can operate
independently without assistance of the compressor circuit(s).
S140 Minimum CW Temp Value—Sets the water temperature at which 100% free-cooling can be
provided to handle the full room load. When the fluid temperature is below this setting, then the
compressors will no longer turn On until the water temperature is above the minimum CW Temp.
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Liebert iCOM for Liebert DSE
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Service Menu Parameters