Stan Dard Fea Tures - All Models - Liebert Challenger Plus CP20A U Technical Data Manual

Challenger Plus - Technical Data Manual
Stan dard fea tures - all sys tems
Access/Maintenance
Rou tine main te nance ac cess to
com po nents, com pres sor, liq uid re ceiver, ther mal ex pan sion
valve, sight glass, fil ter dryer etc. is avail able through the
front panel of the unit. Serv ice ac cess to the air fil ter, the fan,
hu midi fier, elec tric panel, elec tronic con trol ler PCB, elec tric
re heats etc. is also through the unit front panel.
Cus tomer con nec tions to the re frig er ant cir cuit (hot gas and
liq uid line), cool ing wa ter cir cuits, mains power in put
sup ply, hu midi fier wa ter sup ply and con den sate drain lines
are lo cated in the base of the unit.
The com pres sor is housed in a sepa rate air tight com part ment
within the unit, al low ing ac cess to the com pres sor while the
unit is in op era tion.
Cabinet and panels
The cabi net is manu fac tured from zin tec, painted with
epoxy- polyester pow der paint and as sem bled us ing stain less
steel screws.
The front and rear pan els are double- skinned, with 22mm
fi ber glass in su la tion sand wiched be tween the pan els to
re duce noise emis sion and heat loss. The side pan els, which
are iso lated from the in side of the unit, are lined with 22mm
fi ber glass in su la tion sealed in an alu mi num foil.
The edges of the pan els are fit ted with seals to pre vent air loss
and to keep noise lev els to an ab so lute mini mum.
The struc ture is fully in com pli ance with Class 0 (ISO
1182.2). All sur faces in con tact with the air flow are
wash able in or der to re duce the for ma tion of bac te ria. All
ma te ri als used are CFC- free and may be re cy cled.
6
Air distribution
All units in the range are avail able in three con figu ra tions,
re frig er ant cir cuit
Down flow, Up flow Front Re turn and Up flow Bot tom
Re turn, re fer to Fig ure 7.
Fan section
The unit is fit ted with a direct- drive, sin gle in let back ward
curved, gal va nized painted steel ra dial cen trifu gal fan (plug
fan). The fan mo tor is a three- phase, 25- speed mo tor (speed
is ad just able via an au to trans former). The mo tor is rated to
IP44 and com plete with in ter nal ther mal pro tec tion.
The fan im pel ler is stati cally and dy nami cally bal anced and
equipped with self- lubricating bear ings. The fan is mounted
on vibration- absorbing rub ber sup ports to re duce vi bra tion
trans mis sion be tween the fan and the unit frame. This
vi bra tion at tenua tion helps to keep noise emis sion to a
mini mum. The mo tor is ca pa ble of pro vid ing the rated
air flow at ex ter nal static pres sures of up to 350 Pa.
Fig ure 7 - Air Dis tri bu tion
Fig ure 8 - Autotransformer and Fan
SLE CP TDM E.1 (06/99)