Line
ID
Parameter
Name
Range
Default
Setting
Description
S124.1
Humidity Control
Sensor
Remote Sensor
Return Sensor
Return
Sensor
Defines which humidity sensor the humidity setpoint is compared with. The return
sensor is equipped with a Temp/Hum sensor and can calculate the dew point based on
Liebert® iCOM™'s internal look up table. If a sensor other than the return sensor is
selected, the Liebert® iCOM™ will calculate the corresponding RH % based on that
sensors actual temperature.
S125.1
Dew Point
Setpoint &
Humidity
Setpoint
41 - 65°F
5.0 - 18.3°C
48°F
8.9°C
Selects a humidity level that the cooling unit will maintain by removing or adding
moisture to the air. The humidity setpoint will either be set in percent RH or as a dew
point value, depending on what the humidity control type is set for.
S126.1
Humidity Control
Type
Relative
Compensated
Predictive Dew
Point
Predictive
Selects the humidity control calculation. Setting this parameter to relative (%RH) will
control the humidity without considering any temperature deviations. Predictive and
Absolute control consider the temperature deviation from temperature setpoint so that
a constant level of moisture is kept in the area based on the humidity sensor reading
and the temperature deviation from setpoint. Compensated is recalculated with the
actual deviation from temperature setpoint. 1° Celsius is equal to 3 % RH, indirect
proportional. If temperature increases, the humidity setpoint is decreased and vice
versa.
S127.1
Humidity
Proportional
Band
1 - 20% 0.2
Adjusts the activation points of the humidifier and compressors based on the actual
sensor values deviation from setpoint. The smaller this number, the faster the
compressors and humidifier will increase capacity. Too small of a number may cause
the unit to short cycle or overshoot setpoint.
S127.2
Dew Point
Proportional
Band
2 - 18°F
1.1 - 10.0 K
8°F
4.4 K
S128.2
Humidity
Integration Time
0.0 - 25.0 min 0.0 min
Adjusts the capacity of the unit based on a time away from setpoint so that accurate
humidity control can be maintained. If the integration time is set to 0, the humidity
control operates as a proportional only control. When integration time is set, the control
mode changes to PI control
S129.1
Humidity
Deadband
0 - 18°F
0.0 - 10.0 K
4°F
2.2 K
Prevents overshooting of the setpoint and cycling between humidification and
dehumidification. The value entered in this field will be split in half by the temperature
setpoint.
S146.1
Fan Control
Sensor
Supply Sensor
Remote Sensor
Return Sensor
Manual
Return
Sensor
Controls the fan speed for modulation. If MANUAL is selected, then the fan speed can
be controlled from the local display or through a building management system.
S147.1 Fan Setpoint
41 - 104°F
5.0 - 40.0 °C
73°F
22.8°C
Activated when a temperature sensor is being used to control the fan speed. If the same
sensor is used for temperature control and fan speed control, then this value will reflect
the same setpoint as the temperature control setpoint. Manual mode uses fan speed
STD for control.
S148.1
Fan
Temperature
Control Type
Proportional PI
Adaptive PID
PI
Sets the type of control the unit will use to control fan speed. PI control gain is set in the
Temp Prop/Integral parameter. PI control will operate the fan speed so that the actual
temperature of the fan control sensor is equal to the fan temp setpoint. If
PROPORTIONAL only is selected, the fan will change ONLY based on the deviation
from setpoint which will allow the actual temp to settle higher than setpoint.
149.1
Fan
Temperature
Control Prop
Band
4 - 200°F
2.0 - 111.0 K
36°F
20.0 K
Adjusts the fan speed rate of change based on the actual sensor values deviation from
setpoint. The small this number, the faster the fans will increase speed. Too small of a
number may cause the fans increase/decrease to overshoot setpoint
149.2
Fan
Temperature
Control
0.0 - 15.0 min 1.0 min
Adjusts the fans of the unit based on time away from setpoint so that accurate
temperature control can be maintained. The proportional and integral work together to
maintain setpoint. Large p-band with small integral time is a typical way to achieve
Table B.1 Service Menu Setpoints by Line ID (continued)
207
Vertiv™ Liebert® iCOM™Installer/User Guide
To Next Page
Loading...
