Service Menu Parameters
62
Figure 44 Setpoints parameters screen - Page 2
Humidity Setpoint
—This parameter allows the user to select a humidity that the cooling unit will
maintain by removing or adding moisture to the air. This parameter is adjustable from 20-80%. The
factory default setting from the factory is 50%.
Humidity Control Type
—This parameter selects the humidity control calculation. Setting this
parameter to “Relative” 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. The factory default setting is “Predictive.”
Humidity Proportional Band
—This parameter 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.
Humidity Integration Time
—This parameter adjusts the capacity of the unit based on time away
from setpoint so that accurate humidity control can be maintained. This parameter is only active
when Control Type is set to “PI.”
Humidity Deadband
—This parameter can be set to avoid overshooting of the setpoint and cycling
between humidification and dehumidification. The value entered into 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%.
Dehum/Heat Low Limit 1
—This parameter sets the temperature at which 1 of 2 compressors will
be deactivated for dehumidification control. Unit must be set for 2 compressor dehumidification for
this value to be settable. Example—If low limit 1 is set to 4°F (2.2°C) and the temperature setpoint is
70°F (21.1°C) then one of the 2 compressors will turn off at 66°F (18.8°C).
Dehum/Heat Low Limit 2
—This parameter sets the temperature at which all dehumidification is
stopped. Example—If low limit 2 is set to 8°F (4.4°C) and the temperature setpoint is 70°F (21.1°C)
then all dehumidification will be deactivated at 62°F (16.6°C).
SETPOINTS (pg 2 of 6)
to change parameter
to confirm
to select parameter
for next/previous unit
then
UNIT 01
PASSWORD (Actual Level 0)
Humidity Setpoint
Humidity Control Type
Humidity Proportional Band
Humidity Integration Time
Humidity DeadBand
Dehum/Heat Low Limit 1
Dehum/Heat Low Limit 2
????
50%
Relative
10.0%
0min
0.0%
-3°F
-7°F
S112
S113
S114
S115
S116
S117
S118
S119
S120
S121
S122
Summary of Contents for Liebert Challenger 3000
Page 2: ......
