User manual

Service Menu Parameters
Liebert
®
iCOM
®
126
S131 Dehum Setpoint Adjust/Filter—Sets the amount that the Dehum Temp Setpoint is adjusted
when the reheats activate. Example: If the unit is equipped with a reheat device, this parameter will
increase the dehumidification temperature as the call for reheats are increased until the reheat call is
at 100%. When the reheats are at 100%, the full Dehum Setpoint Adjustment will be applied.
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 107 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 3.4.3 -
Liebert Air Economizer Control Menu Settings 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.