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C120-H007-05EN 57
4.5 Precautions Pertaining to the Installation of Air Conditioners
4.5.7 Installing a backup unit
It is recommended that the air conditioner be backed up. Without a backup unit, if the
air conditioner fails, the resultant rise in the computer room temperature would
demand a shutdown of the server system to correct the failure. A backup unit also
facilitates scheduled inspections.
4.5.8 Preventing freezing of cooling water
The air conditioner for a server system is generally run for cooling year round. If a
water-cooled air conditioner is used, care should be taken to prevent the water in the
cooling tower from freezing.