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56 C120-H007-05EN
CHAPTER 4 Air Conditioning
2 When temperature reaches the target range, turn on the server system. The
humidifier may operate after the room temperature reaches a stable state.
(3) Example of stopping humidifier upon starting up of the server
system
In underfloor ventilation, if heat dissipation from server system during startup of the
equipment leads transition of drive condition of the air conditioners, and the room is
dampened heavily so that the room is brought to high humidity, dew condensation
may be caused in the server system. In such case, to prevent high humidity or dew
condensation, stop the humidifier before turning on the server system, restart the
humidifier when the temperature is stabilized after server system is turned on.
4.5.6 Preventing water leaks and installing detectors
Ensure that water leaks, resulting from failures in the air conditioner or water piping
or clogged drain pipes, will not spread to under the raised floor or over the floor
surface. When water leaks occur, they should be detected immediately. It is
recommended that dikes or similar fences be made around the air conditioner and that
leak detectors be installed inside the dike and around the water pipeline.
Figure 4.10 is a schematic view of a dike.
Figure 4.10 Dike