Liebert Challenger Plus CP20A U Technical Data Manual page 19

Op tional fea tures - all mod els (con tin ued)
Base module - upflow units only
A 200mm base mod ule can be sup plied on re quest to sup port
up flow Chal lenger Plus units. The mod ule is used when
cus tomer con nec tions must be made through the base of the
unit, but no false floor is avail able.
Al ter na tively the base mod ule can be used for bot tom air
re turn where there is no raised floor.
Figure 14 - Base Module
Sound attenuation package
In ap pli ca tions where sound emis sion from the unit is of
criti cal im por tance, a spe cial sound at tenu at ing cartridge,
at tached to the top of the unit, is avail able to re duce sound
lev els to an ab so lute mini mum.
The car tridges, made of a self- extinguishing ma te rial with a
high at tenua tion ca pac ity are guar an teed against
dis in te gra tion and re lease of par ti cles due to fric tion within
the duct.
It is pos si ble to in stall one or two rows of car tridges in the
plenum de pend ing on the sound at tenua tion re quired. A
sin gle row re quires a 600 mm high ple num, two rows re quire
a 1200 mm high plenum.
A single car tridge in a 600mm high ple num pro vides a noise
re duc tion of -8.5 dB(A) at 2 m in front of the unit and 1.5 m
from the ground. A sin gle car tridge in a 1200mm high
ple num pro vides a noise re duc tion of -13 dB(A) at 1 m in
front of the unit and at an an gle of 45
A dou ble car tridge in a 1200mm ple num will pro vides a noise
re duc tion of -9.5 dB(A) at 2 m in front of the unit and 1.5 m
from the ground. It will provide a noise reduction of -14
dB(A) at 1 m in front of the unit and at an an gle of 45
unit top.
Re fer to the Op tions sec tion of the Tech ni cal Data Ta bles for
fur ther de tails.
SLE CP TDM E.1 (06/99)
o
to the unit top.
o
to the
Challenger Plus - Technical Data Manual
Fig ure 15 - Sound Attenuation Cartridge
Special packaging
Where the unit is to be trans ported by sea or in other cases
where heavy duty pack ag ing is re quired, spe cial crat ing is
avail able.
This can con sist of ei ther a wooden crate over the stan dard
car board/bub ble wrap pack ag ing or the en tire unit can be
en cased in a wooden box.
Spe cial pack ing for sea trans port, con sist ing of a wooden box
or crate in ad di tion to nor mal card board, can be sup plied on
re quest.
Fig ure 16 - Special Packaging
15