Emerson Liebert CW - Manual (Page 24)

Guide Specifications
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2.5.1.4 Alarms
The Liebert iCOM control shall activate an audible and visual alarm in event of any of the following
conditions:
• High Temperature
• Low Temperature
• High Humidity
• Low Humidity
• Main Fan Overload (opt)
• Change Filters
• Loss of Air Flow
• Loss of Power
• Custom Alarm (#1 to #4)
Custom alarms are four customer accessible alarm inputs to be indicated on the front panel. Custom
alarms can be identified with prepared (programmed) labels for the following frequently used inputs:
• Leak Under Floor
• Smoke Detected
• Loss of Water Flow
• Standby Unit On
User customized text can be entered for two of the four custom alarms.
Each alarm (unit and custom) can be separately enabled or disabled, selected to activate the common
alarm, and programmed for a time delay of 0 to 255 seconds.
2.5.1.5 Audible Alarm
The audible alarm shall annunciate any alarm that is enabled by the operator.
2.5.1.6 Common Alarm
A programmable common alarm shall be provided to interface user selected alarms with a remote
alarm device.
2.5.1.7 Remote Monitoring
All alarms shall be communicated to the Liebert site monitoring system with the following informa-
tion: date and time of occurrence, unit number and current temperature and humidity.
2.5.1.8 Diagnostics
The control system and electronic circuitry shall be provided with self-diagnostics to aid in trouble-
shooting. The microcontroller board shall be diagnosed and reported as pass/not pass. Control inputs
shall be indicated as on or off at the front monitor panel. Control outputs shall be able to be turned On
or Off from the front monitor panel without using jumpers or a service terminal.
2.5.1.9 Data Collection
The control system shall maintain accumulative operating hours of compressors, fan motor and Econ-
O-Coil. The 10 most recent alarms shall be retained.
2.5.1.10 Communication
The Liebert iCOM control shall be compatible with Liebert remote monitoring and control devices.
2.6 Chilled Water Control Valve
The water circuit shall include a 3-way (2-way) modulating valve. The Liebert iCOM positions the
valve in response to room conditions. Cooling capacity will be controlled by bypassing chilled water
around the coil.