Liebert Challenger 3000 with iCOM

Split System ModelsFigure 35 Detail of ceiling hanging bracket3/8" threaded rod(field-supplied)3/8" hex nut3/8" washerSleeveIsolator3/8" fender washer3/8" hex nut3/8" hex nutNylockUnit base pan (ref)7.5.2 DuctingThe total external static pressure for the inlet and outlet ducts, including grille, must not exceed0.5 inches of H 2 O. Hood intake dimensions should be the same as the condensing unit ductdimensions.If the condensing unit is located close to the outside of the building, rain hoods must be installed. Inaddition, install a triple layer bird screen over rain hood openings to eliminate the possibility ofinsects, birds, water, or debris entering the unit.Use flexible ductwork or nonflammable cloth collars to attach ductwork to the unit and to controlvibration transmission to the building. Attach the ductwork to the unit using the flanges provided.Locate the unit and ductwork so that the return air does not short circuit to the supply air inlet.Avoid directing the hot exhaust air toward adjacent doors or windows.Normal operating sound may be objectionable if the condensing unit is placed directly over quiet workareas. Ductwork that runs through a conditioned space or is exposed to areas where condensationmay occur must be insulated. Whenever possible, ductwork should be suspended using flexiblehangers. Ductwork should not be fastened directly to the building structure. In applications wherethe ceiling plenum is used as the heat rejection domain, the discharge air must be directed away fromthe condensing unit air inlet and a screen must be added to the end of the discharge duct to protectservice personnel.For multiple unit installations, space the units so that the hot condensing unit exhaust air is notdirected toward the air inlet of an adjacent unit.Table 31 Airflow CFM (CMH)3-Ton5-Ton60 Hz 2000 (3398) 3500 (5947)50 Hz 1650 (2800) 3500 (5947)66