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52 C120-H007-05EN
CHAPTER 4 Air Conditioning
4.5 Precautions Pertaining to the Installation of Air
Conditioners
Air conditioners that are installed in computer rooms differ in many ways from those
installed in general offices. Precautions specific to installing air conditioners in a
computer room are summarized below.
4.5.1 Humidifier
The reason a humidifier is needed, types of humidifiers available, and humidifiers
used with underfloor-ventilation air conditioners are described below.
(1) Why a humidifier is needed?
In the winter time, drops in the relative humidity of the air in the computer room make
it more susceptible to the generation of static electricity. To prevent this, a humidifier
must be installed to raise the relative humidity of the room air.
(2) Types of humidifiers and replacement water
Use of a humidifier that generates steam by boiling water is recommended.
Using a boiling humidifier will cause impurities in the water to be precipitated and
should have automatic or periodic discharge and replacement of the water.
A spraying humidifier (for example, ultrasonic humidifier, water spray, or centrifugal
sprayer) discharges fine drops of water into the air in vapor form. With this type of
humidifier, impurities in the water could adhere to the equipment or supplies as white
powder. This white powder can be a source of numerous problems, including
defective insulation, rusting, clogged filters, or poor contact, and might also scratch
the surfaces of magnetic disks, resulting in loss of data.
When using spray humidifiers including ultrasonic humidifier, be sure to maintain the
purity of distilled water.
The following conditions must be considered when using purifiers.
z Let distilled water pass the ion exchange resin of the purifier. The conductivity of
water after passing a purifier must not exceed 2 μS/cm.
z Use a purifier that detects problems in the ion exchange resin automatically to
sustain the performance of the purifier. When problems are detected, replace the
ion exchange resin.