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C120-H007-05EN 29
3.4 Air Conditioners
3.4 Air Conditioners
Factors to be considered when laying out air conditioning are described below:
3.4.1 Air conditioning units
Do not simply install a single, high-capacity central air conditioning unit in the
computer room or an adjoining air-conditioning room. Considering possible device
failures and the need for regular maintenance of air conditioning units, Fujitsu
recommends installing multiple small-capacity air conditioning units (having a
cooling power between 15 kW and 50 kW) at locations throughout the computer
room. Ensure that the installation area, including maintenance space, is not
unnecessarily large.
3.4.2 Air conditioning piping
When installing an underfloor-ventilation air conditioning unit, be careful to keep the
piping from interfering with the underfloor ventilation or wiring. Construct the air
conditioning piping upright from the floor above, below the ceiling, or on the back of
the air conditioning unit.
3.4.3 Heat distribution
Devices that generate high heat should be installed at the place where the devices are
cooled sufficiently by cold air from an air conditioner. Install air conditioners matched
to the required heat dissipation in each area.
3.4.4 Air circulation
When installing air conditioners in the computer room, lay out the equipment to allow
the air blown out from the air conditioner to circulate all around the equipment and
then back to the air conditioner steadily so that stagnant air will not exist. Because
airflow tends to stop around tall equipment, pay special attention to the relation
between the location of tall equipment and the air outlet of the air conditioner.
In a system using underfloor ventilation for air conditioning, consider the paths of
both hot and cold airflow.