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Liebert iCOM
®
Control
69 Liebert
®
CRV
™
Figure 57 Setpoints parameters screen - Page 1
Temperature Setpoint—This parameter selects a temperature that the cooling unit will maintain
by applying cooling and or reheats. This parameter is adjustable from 41-104°F (5-40°C), the factory
default setting is 73°F (22.7°C).
Temperature Control Sensor—This sensor controls the cooling capacity of the Liebert CRV. If the
unit is chilled water model, then this sensor controls the chilled water valve opening. If the unit is a
DX (direct expansion) model then this sensor will control the amount of digital scroll capacity.
Temperature Control Type—This parameter selects the type of control the system will use to
activate cooling, heating, humidification and dehumidification. A detailed description of each control
type can be found in 3.7 - Supply Control.
Temperature Deadband—This parameter can be set to avoid overshooting of the setpoint and
cycling between the reheats and cooling. The value entered into this field will be split in half by the
temperature setpoint. Example—If the temperature setpoint is 70°F (21.1°C) and a 4°F (2.2°C)
deadband is set, then no cooling will be activated until 72°F (22.2°C) and no heating will be activated
until 68°F (20°C) is reached.
Cooling Proportional Band—This parameter adjusts the activation points of compressors or rate
of change based on the actual sensor values deviation from setpoint. The smaller this number the
faster the compressors and valve(s) will increase capacity. Too small of a number may cause the unit
to short cycle the compressors or excessively reposition the valve.
Cooling Integration/Derivative—Cooling integration takes into consideration the amount of time
the actual temperature has deviated from the setpoint. The longer this deviation exists the more
corrective action the unit will use to achieve the setpoint. The derivative term monitors the rate of
change and will reduce or increase the amount of corrective action based on the actual temperature
increasing or decreasing toward the temperature setpoint.
S101
S102
S103
S104
S105
S106
S107
S108
S109
S110
S111
PASSWORD (Actual Level 0) ????
Temperature Setpoint 68 °F
Temperature Control Sensor Remote Sensor
Temperature Control Type Proportional
Temperature Deadband 2°F
Cooling Proportional Band 9°F
Cooling Integration /Derivative min /sec
Heating Proportional Band 9°F
Heating Integration /Derivative min /sec
CRV Control Average
SETPOINTS (page 1 of 4) UNIT 01
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