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Liebert iCOM
®
Control
71 Liebert
®
CRV
™
Figure 59 Setpoints parameters screen - Page 3
Fan Control Type—This parameter sets how the fan speed will be controlled. This parameter can be
set to Auto mode, which will allow the Liebert CRV to drive the fan based on the temperature sensor
selected for sensor control type. This parameter can also be set to Manual mode, which allows the
Liebert CRV to be set to a fixed fan speed either through the local display or through a building
management system.
Fan Control Sensor—This parameter sets which sensor will drive the Liebert CRV fans when set to
Auto mode for the fan control type.
Fan Regulation Type—This parameter is the fans’ control type. It can be set to Proportional
control, which will modulate the fans linearly based on the deviation from the setpoint. PI control is
also available and works in the same manner as the temperature control integral term.
Fan Delta—This parameter sets the fan speed setpoint. The delta accounts for the temperature rise
from the Supply Air Sensor and the Remote Rack sensors by adding the Fan Delta to the
Temperature Setpoint (S102). This eliminates the possibility of setting the remote rack temperature
setpoint lower than the supply temperature setpoint.
Fan Speed Proportional Band—This parameter adjusts the fans rate of change based on the
actual sensor values deviation from setpoint or the delta. The smaller this number the faster the fan
will increase its speed. Too small of a number may cause the fans to excessively reposition.
Fan Speed Integration—This parameter adjusts the fanspeed of the unit based on time away from
setpoint. This parameter is only active when Control Type is set to “PI.”
Fan Speed Manual Setpoint—This parameter sets the speed of the fans when the unit is placed
into Manual Fan Speed Control mode.
Fan Speed STD—This parameter sets the maximum fan speed of the unit under normal operating
circumstances.
Fan Speed Min—This parameter sets the lowest fan speed operation of the unit.
Fan Speed Dehum—This parameter sets the fan speed the unit will operate at during a call for
dehumidification. The fan speed will position to the highest requirement. If the call for fan speed from
the remote rack sensor is requesting more CFM than the Dehum fan speed, then the fans will run at
the remote sensor fan speed request.
S123
S124
S125
S126
S127
S128
S129
S130
S131
S132
S133
PASSWORD (Actual Level 0) ????
Fan Control Type Auto
Fan Control Sensor Remote Sensor
Fan Regulation Type
Fan Delta °F
Fan Speed Proportional Band °F
Fan Speed Integration min
Fan Speed Manual Setpoint %
Fan Speed STD 75%
Fan Speed Min 50%
Fan Speed Dehum 70%
SETPOINTS (page 3 of 4) UNIT 01
to change parameter
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