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Data Collection
The control system shall maintain accumulative operating hours of compressor, reheat, humidifier,
fan motor, Econ-O-Coil, and heat rejection. The sixty most recent alarms shall also be retained.
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 Liebert remote monitoring and control devices.
2.1.6
Infrared Humidifier (Standard)
The humidifier shall be of the infrared type consisting 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
humidifier section shall be pre-piped ready for final connection. The infrared humidification system
shall use bypass air to prevent over-humidification of the controlled space. The auto flush system
shall automatically 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).
2.1.7
Steam Generating Humidifier (Optional)
The environmental control system shall be equipped with a steam generating humidifier that is con-
trolled by the microprocessor control system. It shall be complete with disposable canister, all supply
and drain valves, steam distributor, and electronic controls. The need to change canister shall be
annunciated on the microprocessor control panel. The humidifier shall have a capacity of ____ lbs/hr
(kg/h).
2.1.8
Electric Reheat (Standard)
The low-watt density, 304/304, stainless steel, finned-tubular electric reheat coils shall be capable of
maintaining room dry bulb conditions when the system is calling for dehumidification. The reheat
section shall include UL recognized safety switches to protect the system from overheating. The
capacity of the reheat coils shall be ____ BTU/HR (kW), ____ kW, controlled in ____ stage(s).
2.1.9
Hot Water Reheat (Optional)
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. Maximum pressure drop shall be _____ PSI (kPa). The control system shall be factory pre-piped
with a 2-way motorized control valve and cleanable Y-strainer.
2.1.10 SCR Electric Reheat (Optional)
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 con-
troller provides precise temperature control, and the more constant element temperature improves
heater life. The capacity of the reheat coils shall be _____ BTU/HR (kW).
2.1.11 Floor Stand (Optional)
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.
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Electrical Data
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