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CAUTION: Always be sure that equipment is properly grounded and that you follow proper
grounding procedures before beginning any installation procedure. Improper grounding can
result in ESD damage to electronic components. For more information, refer to "Electrostatic
discharge (on page 37)."
CAUTION: When performing non-hot-plug operations, you must power down the server
and/or the system. However, it may be necessary to leave the server powered up when
performing other operations, such as hot-plug installations or troubleshooting.
Space and airflow requirements
To allow for servicing and adequate airflow, observe the following space and airflow requirements when
deciding where to install a rack:
•
Leave a minimum clearance of 63.5 cm (25 in) in front of the rack.
•
Leave a minimum clearance of 76.2 cm (30 in) behind the rack.
•
Leave a minimum clearance of 121.9 cm (48 in) from the back of the rack to the back of another rack
or row of racks.
Hewlett Packard Enterprise servers draw in cool air through the front door and expel warm air through the
rear door. Therefore, the front and rear rack doors must be adequately ventilated to allow ambient room
air to enter the cabinet, and the rear door must be adequately ventilated to allow the warm air to escape
from the cabinet.
CAUTION: To prevent improper cooling and damage to the equipment, do not block the
ventilation openings.
When vertical space in the rack is not filled by a server or rack component, the gaps between the
components cause changes in airflow through the rack and across the servers. Cover all gaps with
blanking panels to maintain proper airflow.
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.
The 9000 and 10000 Series Racks provide proper server cooling from flow-through perforations in the
front and rear doors that provide 64 percent open area for ventilation.
CAUTION: When using a Compaq branded 7000 series rack, install the high airflow rack
door insert (PN 327281-B21 for 42U rack, PN 157847-B21 for 22U rack) to provide proper
front-to-back airflow and cooling.
CAUTION: If a third-party rack is used, observe the following additional requirements to
ensure adequate airflow and to prevent damage to the equipment:
• Front and rear doors—If the 42U rack includes closing front and rear doors, you must allow
5,350 sq cm (830 sq in) of holes evenly distributed from top to bottom to permit adequate
airflow (equivalent to the required 64 percent open area for ventilation).
• Side—The clearance between the installed rack component and the side panels of the rack
must be a minimum of 7 cm (2.75 in).
Temperature requirements
To ensure continued safe and reliable equipment operation, install or position the rack in a well-ventilated,
climate-controlled environment.
Planning the installation 7
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