Cooling And Airflow Requirements; Power Requirements - ClearCube R1200 User Manual

Cooling and Airflow Requirements

Power Requirements

R Series Data Center Products User's Guide, Rev. B
Each complete chassis normally produces between 3100 and 3850 btu/hr (900 to 1130
watts) of heat, depending on processor activity, and a maximum of 5100 btu/hr (1500
watts). Ensure that the air conditioning and ventilation system for the installation area
can accommodate this thermal load. The back of the chassis has air vents for four
fans. The fan openings must be at least four inches from any airflow impeding barriers
such as walls, the back of the rack door or panel, large bundles of cables, etc. The
availability of an air exit path from these fans is imperative to the efficient operation of
the unit. Failure to provide sufficient air venting will result in a thermal overload of the
blade. If the chassis is installed in a cabinet, use a fully vented back door or panel.
CAUTION: Failure to provide sufficient space and room ventilation will
result in overheating that can cause eventual unit failure not covered as
part of the unit warranty.
Your ClearCube system centralizes all computing components in a single location
thereby concentrating the majority of the power needed to this one area. Although the
ClearCube solution reduces the overall power required when compared to traditional
box PCs, the power demands in the IT center are increased. Use the following power
and current specifications to ensure that your facilities can provide the required power
safely without tripping your circuit breakers.
You need to ensure that your power circuits can safely handle the peak current that
can be drawn by a chassis. The peak current usually occurs when a chassis and all
eight blades are powered on simultaneously. This maximum current must be
supported by your power circuit. An R4300 chassis and eight blades installed can
draw a peak current of 12 amps at 120 VAC (6 amps at 240 VAC) during power on.
The peak current is reached only briefly and thereafter the current draw levels out to a
typical range of between 7 and 9 amps at 120 VAC, depending on processor activity.
If your existing power circuit cannot handle the peak current of 12 amps, you must
have additional power system capacity installed by a qualified electrician.
If you are putting multiple chassis assemblies on a single power circuit, ensure that the
circuit can safely handle the combined peak currents of all the chassis assemblies. For
example, if you place two chassis assemblies on a single branch circuit, it must support
a peak current of 24 amps at 120 VAC.
CAUTION: Make sure your power strips, power grid, and circuit breakers
can safely provide the required current. Ensure that any extension cords
used meet local safety regulations and local fire codes.
When specifying uninterruptible power supplies (UPS), use the peak current draw (9
amps at 120 VAC per chassis) to determine the appropriate UPS. Please see the
ClearCube Site Preparation Checklist and Site Preparation Guide documents on the
Network Planning and Site Preparation • 29