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Electrical Data
The control system shall maintain accumulative operating hours of compressor, reheat, humidifier, fan motor, and
Communications
The microprocessor shall be compatible with all Liebert remote monitoring and control devices.
2.1.5Advanced Microprocessor Control with Graphics (Optional)
The optional Advanced control processor shall be microprocessor based with a front monitor dot matrix display panel and control keys for user inputs. The controls shall be menu driven with on- screen prompts for easy user operation. The system shall allow user review and programming of tem- perature and humidity setpoints, alarm parameters, and setup selections including choice of control type. A password shall be required to make system changes. For all user selections, the range of acceptable input (temperature, humidity, or time delay) shall be displayed on the monitor screen. The system shall provide monitoring of room conditions, operational status in % of each function, compo- nent run times, date and time, and four analog inputs from sensors provided by others.
Control
The control system shall allow programming of the following room conditions:
•Temperature Setpoint 65 to 85°F
•Temperature Sensitivity +1 to +9.9°F (0.6 to 5.6°C) in 0.1° increments
•Humidity Setpoint 20 to 80% RH
•Humidity Sensitivity +1 to +30% RH
All setpoints shall be adjustable from the individual unit front monitor panel.
Temperature and Humidity Sensors shall be capable of being calibrated using the front monitor panel controls to coordinate with other temperature and humidity sensors in the room.
Predictive Humidity Control
The microprocessor shall calculate the moisture content in the room and prevent unnecessary humid- ification and dehumidification cycles by responding to changes in dew point temperature.
Compressor
The control system shall include a program to prevent compressor
System Auto-Restart
For
Sequential Load Activation
During
Chilled Water/Hot Water/Econ-O-Coil Flush Cycles
Chilled water, hot water, and
Front Monitor Display Panel
The microprocessor shall provide a front monitor 240 x 120 dot matrix display panel with adjustable backlighting. This display (along with five front mounted control keys) shall be the only operator interface required to obtain all available system information such as room conditions, operational sta- tus, graphical data, alarms, control and alarm setpoints, and all user selections including alarm delays, sensor calibration, DIP switch selections, and diagnostics. All indicators shall be in language form. No symbols or codes shall be acceptable.
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