Planning the installation 10
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Leave a minimum clearance of 121.9 cm (48 in) from the back of the rack to the rear of another rack
or row of racks.
HP BladeSystem servers draw cool air in through the front and expel warm air through the rear of the
enclosure. Therefore, the front of the rack enclosure must be adequately ventilated to enable ambient room
air to enter the enclosure, and the rear of the enclosure must be adequately ventilated to enable the warm air
to escape from the enclosure.
IMPORTANT:
Do not block the ventilation openings.
If the front of the rack is not completely filled with components, the remaining gaps between the components
can cause changes in the airflow, which can adversely affect cooling within the rack. Cover these gaps with
blanking panels.
CAUTION:
Always use blanking panels to fill empty vertical spaces in the rack. This arrangement
ensures proper airflow. Using a rack without blanking panels results in improper cooling that can
lead to thermal damage.
In high density configurations, the HP 10000 Series Rack Airflow Optimization Kit (AF090A) should be
installed to prevent airflow from the rear of the rack to the front the rack via gaps in the rack frame.
HP 10000 Series and 10000 G2 Series racks provide proper server cooling from flow-through perforations
in the front and rear doors that provide 65 percent open area for ventilation.
CAUTION:
Always use blanks to fill empty spaces in enclosures. This arrangement ensures
proper airflow. Using an enclosure without the proper blanks results in improper cooling that can
lead to thermal damage.
Power requirements
Installation of this equipment must comply with local and regional electrical regulations governing the
installation of IT equipment by licensed electricians. This equipment is designed to operate in installations
covered by NFPA 70, 1999 Edition (National Electric Code) and NFPA-75, 1992 (code for Protection of
Electronic Computer/Data Processing Equipment). For electrical power ratings on options, refer to the
product rating label or the user documentation supplied with that option.
WARNING:
To reduce the risk of personal injury, fire, or damage to the equipment, do not
overload the AC supply branch circuit that provides power to the rack. Consult the electrical
authority having jurisdiction over wiring and installation requirements of your facility.
CAUTION:
Protect the enclosure from power fluctuations and temporary interruptions with a
regulating UPS. This device protects the hardware from damage caused by power surges and
voltage spikes and keeps the enclosure in operation during a power failure.
Grounding requirements
This equipment must be grounded properly for proper operation and safety. In the United States, you must
install the equipment in accordance with NFPA 70, 1999 Edition (National Electric Code), Article 250, as
well as any local and regional building codes.