Liebert Little Glass House User Manual download pdf (Page 4)

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.

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Liebert Little Glass House User Manual Page 4

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