54 C120-H007-08EN
CHAPTER 4 Air Conditioning
4.5.3 Installing temperature/humidity sensors
Temperature/humidity sensors used to regulate the temperature and humidity of an air
conditioner are installed at different positions according to the ventilation method.
(1) Location of temperature/humidity sensors for a room air
conditioner
Location to install temperature/humidity sensors for a room air conditioner is:
At a height of about 1 to 1.5 m (3.3 to 4.9 ft) above the floor
Where measuring the mean temperature and humidity is available
Where they are not exposed to direct drafts of cold air from the air conditioner or
air emissions from the equipment
(2) Location of temperature/humidity sensors for an underfloor-
ventilation air conditioner
Location to install a temperature/humidity sensor for a underfloor-ventilation air
conditioner is:
Under the floor 1 to 1.5 m (3.3 to 4.9 ft) from the air outlets
Where they are readily accessible for inspection
4.5.4 Taking in fresh air
Fresh air needs to be drawn into the computer room for operators.
(1) Volume of fresh air
Fresh air should be taken in at a rate of about 30 m
3
/h (1100 ft
3
/h) per operator present.
Where outside air is taken in through a duct, and not by natural ventilation through
ventilation, dust must be removed and its temperature and humidity regulated before
it can be fed into the room or under the floor.
(2) Preventing natural inflow of outside air
Install a closing damper at the outside air intake duct. Keep it closed to prevent the
natural inflow of outside air while the air conditioner is shut down. Prevent natural
inflow of outside air through ventilation.
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