Liebert iCOM
®
Control
105 Liebert
®
CRV
™
Example: The customer does not want fan speed to exceed 35% of the maximum speed at night.
U807 would be set for 0% / 100%
U818 = 35% (Max fan speed low noise)
U819 = 100% (Max fan speed during normal operation)
The settings above result in a 35% maximum speed when the timer is active (eg., a night) and
have the ability to run between 0 and 100% maximum speed of when the timer is inactive (normal
operation, during daytime).
U820 Current Max Speed—Shows the status of the actual maximum fan speed.
11.5 Liebert iCOM Service Menu Screens
Service menus allow customized settings for site operations. The password for service menu
parameters is 5010.
The Liebert iCOM firmware is being updated constantly. As a result, the Service menu parameter in
this manual may be different than what is shown on a cooling unit’s display. Check
www.liebert.com for the latest Liebert iCOM user manual updates.
Figure 81 Service menus—Setpoints parameters screen - Page 1
S102 Temperature Setpoint—Selects a temperature that the cooling unit will maintain by
applying cooling and or reheats. This parameter is adjustable from 45-104°F (7.2-40°C). The factory
default setting is 68°F (20.0°C).
S103 Temperature Control Sensor—Designates which sensor will drive the compressor capacity.
• Settings:
• Supply Sensor
• Remote Sensor
• Return Sensor
If S103 and S125 are set to equal values, this is called coupled. In that case, compressor capacity
and fanspeed work in parallel (based on one control output), driven by the same control
parameters.
If S103 and S125 are set to different values, this is called decoupled. In that case, the compressor
capacity and the fanspeed work on different control circuits, each with its own control parameters
and control outputs.
S104 Temperature Control Type—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 Supply Control on page 95.
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