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INTRODUCTION
Your Liebert Little Glass House™ (LGH) will
provide a secure controlled environment in a
single factory assembled enclosure. The
integrated/matched models are designed to
control the environment and provide smooth
reliable power so that your sensitive computer
and network equipment will provide the reliable
performance you depend upon for your business
operations.
The Little Glass House is completely factory
assembled and tested, ready for you to install
your equipment and plug the unit into a 120 V~/
60 Hz or 230 V~/ 50 Hz dedicated outlet. For 60
Hz models, the required power
receptacle/socket may be 15, 20, or 30 Amps,
depending on your selected LGH. Models with
60 Hz ECM-80 uses two input power
connections, with one 20 Amp plug for the ECM-
80 and the other plug either 15 or 20 Amps
depending on the UPS model. For 50 Hz
models, a power cord is included for connection
to a customer supplied plug.
Refer to drawings and tables in this manual for
dimensions, environmental performance data,
and input power requirements. Refer to the
separate UPS manual for UPS performance
details.
ENCLOSURE
The enclosure can accommodate shelf mounted
or rack mounted equipment, on either 19 or 24
inch punched rails (per EIA-310). The 19 inch
rack cabinets are 25 inches (635 mm) wide.
Cabinets with 24 inch racks are 30 inches (765
mm) wide. The enclosures can be nominal 72
or 78 inches (1830 or 1980 mm) high, and 34 or
38 inches (865 or 965 mm) deep. The unit is
mounted on casters and leveling feet. Interior
insulation is provided in models with
Environmental Control Module (ECM) cooling.
A solid panel (metal) front door is standard. A
smoked plastic front window is available to
maintain enclosure security while allowing you to
monitor equipment status. The rear door
provides convenient access to customer wiring.
Two horizontal cable entrance raceways are
provided. An optional internal cable
management raceway (vertical) is available.
Both doors have a key lock and a four point
latch.
ENVIRONMENTAL CONTROL
The Uninterruptible Air Supply™ (UAS) consists
of an Environmental Control Module (ECM) and
a Back-up Cooling Fan. The ECM is normally
sized to match the capacity of the UPS module
plus heat transmitted into the LGH. Three ECM
modules, ECM-42, ECM-62, and ECM-80 are
available. Air is controlled and circulated within
the enclosure. Outside (ambient) air is used to
remove heat from the enclosure through the air
cooled condenser. Two-speed fans are used to
provide quiet operation. At rated maximum
ambient conditions, the temperature inside the
enclosure will be from 70° to 95°F (21 to 35°C),
depending on the electronics load. If the internal
cabinet temperature reaches 100°F (38°C) -- for
example, during a power failure -- the Back-up
Cooling Fan operated on UPS battery power will
flow filtered ambient air through the enclosure.
The Back-up Cooling Fan is standard on UAS
models. All UAS or ECM models require a
clearance of 12 inches (305 mm) both on top
and rear of the LGH for proper airflow. The 50
Hz back-up cooling options have an On/Off (O/I)
switch located in the inlet channel to the ECM
condenser coil. This switch should be on during
normal operation.
If environmental control as previously described
is not required, Forced Air Cooling (FAC) is
available. Filtered ambient air is drawn through
the enclosure from the bottom front to the top
rear. A two-speed fan is controlled by a
thermostat factory set at 80°F (27°C), which
measures air entering the unit. The two-speed
fan design provides quiet low-speed operation
below the thermostat set point. A single fan
(nominally rated at 190 CFM - 323 CMH) or dual
fans (nominally rated at 360 CFM - 611 CMH)
can be provided. A clearance of 12 inches (305
mm) is required both on top and rear of the LGH
for FAC models.