user manual
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 self-diagnostics to aid in troubleshoot-
ing. 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. 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, 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 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 pre-piped ready for final connec-
tion. The infrared humidification system shall use
bypass air to prevent over-humidification of the con-
trolled space. The auto flush system shall automati-
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 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 approved safety switches to
protect the system from overheating. The capacity of
the reheat coils shall be ____ BTU/HR (kW), ____ kW,
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 pre-piped with a
2-way motorized control valve and cleanable
Y-strainer.
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.
DISCONTINUED
PRODUC T