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Standard Features—All Systems
7
4.0 STANDARD FEATURES—ALL SYSTEMS
4.1 Cabinet and Frame
The frame, 14 gauge, MIG welded tubular and formed steel, provides maximum support while 1"
(25.4mm) deep steel panels with 1-1/2 lb. (.68 kg) insulation protect and quiet the system. The front
door can be opened for service without shutting off the system. All components are accessible for ser-
vice/maintenance through the front and rear of the unit.
The Liebert Challenger ITR’s resistance to corrosion is enhanced by the black, powder-coat finish to
all frame components. Exterior panels are similarly protected with durable powder-coating.
4.2 Electrical Panel
The high voltage compartment contains the contactors, transformers and overloads and all other
high-voltage components.
Each high voltage component is protected by a separate overcurrent protective device. The entire high
voltage panel is enclosed by a safety lock dead front panel. When the front door is opened by operating
personnel, the high voltage components remain enclosed for operator safety.
4.3 Fan Section
The Liebert Challenger ITR features a quiet, low speed fan assembly with double inlet blower, life-
time lubrication and self-aligning ball bearings. The motor and variable pitch drive are mounted on
an adjustable base. The entire blower/ motor assembly is mounted on vibration isolators for smoother
operation.
The draw-through design of the fan section provides even air distribution across the coil, controlled
air for bypass humidification, elimination of air bypass around the filters and low internal cabinet
pressure drop.
4.4 Infrared Humidifier
High-intensity quartz lamps over the stainless steel humidifier pan permit clean, particle-free vapor
to be added to the air within 5 to 6 seconds of the electronic call from the microprocessor control.
The quartz lamps provide radiant energy that evaporates water in a pure state, without solids.
The Infrared Humidifier is equipped with an automatic water supply system that significantly
reduces cleaning maintenance. This system has an adjustable water over-feed to prevent mineral pre-
cipitation. A drain valve is provided to easily empty the humidifier pan prior to inspection or servic-
ing. A control valve regulates flow at water pressures between 5 and 150 psig (34.5 and 1034 kPa) and
includes a Y-strainer.
4.5 Electric Reheat
The two-stage 304 stainless steel reheat elements are a rigid, fin-tubular design that have extended
operation life. The reheat has ample capacity to maintain room dry-bulb conditions during a system
call for dehumidification. The two stages give an accurate, controlled response to the requirements of
the computer room. The low watt density, electrically enclosed elements are surrounded by the tube
and fins, reducing sheath temperatures and eliminating ionization.
4.6 Filters
The standard pleated 2" (51mm) filter with an efficiency of 20% (based on ASHRAE 52.1) can be
changed quickly and easily through the front of the unit.