Common Alarm
A programmable common alarm shall be provided to interface user selected alarms with a remote alarm device.
Remote Monitoring
All alarms shall be communicated to the Liebert site monitoring system with the following information: date and time of occurrence, unit number, and present temperature and humidity.
Analog Inputs
The system shall include four customer accessible analog inputs for sensors provided by others. The analog inputs shall accept a 4 to 20 mA signal. The user shall be able to change the input to 0 to 5 VDC or 0 to 10 VDC if desired. The gains for each analog input shall be programmable from the front panel. The analog inputs shall be able to be monitored from the front panel.
Diagnostics
The control system and electronic circuitry shall be provided with
Control outputs shall be able to be turned on or off from the front monitor panel without using jumpers or a service terminal. Each control output shall be indicated by an LED on a circuit board.
Data Collection
The control system shall maintain accumulative operating hours of compressor, reheat, humidifier, fan motor,
Graphing
The control shall display the following graphical data:
Temperature, humidity, analog inputs Component operating status by hour Operating status
Communications
The microprocessor shall be compatible with all Lie- bert remote monitoring and control devices.
The humidifier shall be of the infrared type consist- ing of high intensity quartz lamps mounted above and out of the water supply. The evaporator pan shall be stainless steel and arranged to be service- able without disconnecting water supply lines, drain lines or electrical connections. The complete humidi- fier section shall be
cally flush deposits from the humidifier pan. The system shall be field adjustable to change the cycle time to suit local water conditions. The humidifier shall have a capacity of _____ lbs/hr (kg/h).
The environmental control system shall be equipped with a steam generating humidifier that is controlled by the microprocessor control system. It shall be complete with disposable canister, all supply and drain valves, steam distributor, and electronic con- trols. The need to change canister shall be annunci- ated on the microprocessor control panel. The humidifier shall have a capacity of ____ lbs/hr (kg/h).
The
controlled in ____ stage(s).
The hot water reheat coil shall have copper tubes and aluminum fins with a capacity of _____ BTU/HR
(kW) when supplied with _____ °F (°C) entering
water temperature at _____GPM (l/s) flow rate. Max-
imum pressure drop shall be _____ PSI (kPa). The
control system shall be factory
The SCR (Silicon Controlled Rectifier) controller shall proportionally control the stainless steel reheats to maintain the selected room temperature. The rapid cycling made possible by the SCR control- ler provides precise temperature control, and the more constant element temperature improves heater life. The capacity of the reheat coils shall be _____
BTU/HR (kW).
The floor stand shall be constructed of a heliarc- welded tubular steel frame. The floor stand shall be coated using an autodeposition process to protect against corrosion. The floor stand shall have adjust- able legs with vibration isolation pads. The floor stand shall be: 9 in. (23cm), 12 in. (30cm), 15 in. (38cm), 18 in. (46cm), 21 in. (53cm), 24 in. (61cm) high.
The turning vane shall be designed to mount in the factory supplied floor stand and direct air either to the front or rear of the unit.
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