Figure 82 Service Menus-Setpoints Parameters Screen - Emerson Liebert CRV User Manual

S105 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.
S106 Cooling Proportional Band—Adjusts the activation points of compressor or chilled water
valve. The cooling proportional band adjusted the rate of change based on the actual sensor value's
deviation from setpoint. The smaller this number, the faster the compressor valve will increase
capacity. Too small of a number may cause the unit to short cycle the compressor or excessively
reposition the valve.
S107 Cooling Integration—Cooling integration takes into consideration the 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.
Figure 82 Service menus—Setpoints parameters screen - Page 2
S113 Humidity Setpoint—Selects a humidity that the cooling unit will maintain by removing or
adding moisture to the air. This parameter is adjustable from 20-55%. The factory default setting
from the factory is 45%.
This setting is automatically updated when S103 Controlling Sensor is changed.
• IF _S103 (TempSensTy) == 0 (Supply) THEN set = 45%
• IF _S103 (TempSensTy) == 1 (Remote) THEN set = 45%
• IF _S103 (TempSensTy) == 2 (Return) THEN set = 25%
S114 Humidity Control Type—Selects the humidity control calculation. It can be set to
"Proportional" or "PI" (proportional/integral) only. The Liebert CRV assumes the current humidity at
the control sensor by calculating the return air dew point, and then taking the temperature setpoint
of the selected cooling sensor (S103) as a reference to recalculate the humidity.
S115 Humidity Deadband—This parameter can be set to avoid overshooting of the setpoint and
cycling between humidification and dehumidification. The value in this field will be split in half by
the temperature setpoint. Example: If the humidity setpoint is 50% and a 4% deadband is set, then no
humidity control will be activated between 48% and 52%.
S116 Humidity Proportional Band—Adjusts (1- 25%) the activation points of the humidifier and
compressors based on the actual sensor values deviation from setpoint. The lower this value the faster
the compressors and humidifier will increase capacity. A value that is too small may cause the unit to
short cycle or overshoot setpoint.
S117 Humidity Integration Time—Adjusts the capacity of the unit based on time away from
setpoint (0 - 25 minutes) so that accurate humidity control can be maintained. This parameter is
active only when Control Type is set to "PI."
S118 Dehum Proportional Band—Adjusts the activation points of dehumidification based on the
actual sensor values deviation from setpoint. The lower this number the faster the compressors and
humidifier will increase capacity. A value that is too small may cause the unit to short cycle or
overshoot its setpoint.
® ™
Liebert CRV 106
®
Liebert iCOM Control