Emerson Liebert Challenger ITR - Manual (Page 26)

Optional Equipment—All Systems
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10.3 SCR Reheat
This reheat uses stainless steel elements and also includes the necessary sensors and controls to pro-
vide variable heat output to help maintain tighter control of room conditions, especially in lightly
loaded applications. (Contact factory for available voltages.) Direct expansion units only.
10.4 High-Efficiency Filter
Four optional filters are available in lieu of standard package. A 4" (102mm) 20%, 30%, 40%-45% or
60%-65% filter may be specified. (Efficiency based on ASHRAE 52.1). 2" (51mm) 20% pre-filters may
also be specified.
10.5 High External Static Blowers
These blower/motor packages are available where external static pressures are up to 2.0 inches (500
Pa) on 60 Hz units, and up to 1.5 inches (370 Pa) on 50 Hz units. These blowers are rigidly mounted
for ducting directly to the blower housing.
(Consult the factory for specific applications.)
10.6 High-Efficiency Motors
These motors replace the standard efficiency motors to provide increased energy savings during oper-
ation (consult factory for specific efficiencies).
10.7 Plenums
Standard height of 18" (457mm) with top duct connection or two-way, three-way or 4-way grille dis-
charge styles available.
10.8 Low-Profile Plenum with Cold-Aisle Discharge
This plenum is designed to distribute supply air to electronic equipment beside and across from the
cooling unit. In addition to air exiting the front of the plenum, internal baffles direct air through the
left-side and right-side discharge vents. Factory-supplied hardware allows air to be blocked from exit-
ing one side of the plenum, allowing the cooling unit to be installed at the end of a row of equipment.
Plenum With Two-Way Grille
Low-Profile, Cold Aisle Discharge Plenum