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 MIL-HDBK-1012/1
piping and controls. Glycol-loop exchangers (or water-loop exchangers in
climates not subject to freezing) permit use of a closed water system
connected to the condenser and facilitate compressor head pressure control by
pressure-actuated water regulators at the condenser.
8.11.2.7 Instrumentation. Most automatic data processing centers require
room temperature/humidity recording devices. Alarms should be incorporated
with the recorders to signal if temperature or humidity is too high or two
low. In large rooms, recorders should be installed in each zone. When
chiller water is supplied directly to the computer, records of chilled water
inlet and outlet temperatures and pressures should be maintained. Sensing
devices to indicate the presence of water in the computer room under-floor
cavity are desirable if chilled water piping is installed in the cavity. All
monitoring and alarm devices should provide local indication, and, if a
central monitoring and control point exists, the alarms should be transmitted
to that location.
8.11.2.8 Fire Protection. As a minimum, smoke detectors should be provided
in both the room and the air conditioned air stream. Under raised floors,
these devices should be provided in the cavity, regardless of whether it is
used as a plenum, when electrical cabling is installed, The fire protection
system should include a controlled and properly sequenced shutdown of computer
power, either manual or automatic, depending on its criticality and the
potential for false alarms. Refer to MIL-HDBK-1008 for additional guidance.
8.11.3
Electrical
8.11.3.1
Lighting
a) Fixtures. Lighting fixtures shall be recessed within the
ceiling where possible. Fixtures extending below the ceiling shall not
interfere with equipment installation.
b) Sunlight. Direct sunlight shall not interfere with the low
levels of illumination needed for visibility of the console and signal lamps.
c) Control. Lights for general illumination shall be sectionally
controlled by switches so that portions of the lighting can be turned off as
desired.
d) Emergency Lights. Emergency lighting shall be provided as
required by NFPA 101, Code for Safety to Life from Fire in Buildings and
Structures. The lighting shall be adequate to light the computer area when
general illumination is off. In transportables, provisions shall be made to
keep emergency lights from operating during shipment.
8.11.3.2 Power Requirements. Design shall conform to Article 645 of
NFPA 70.
a) Equipment Power. The designer shall comply with the power
requirements and characteristics peculiar to each piece of computer equipment.
The information will be supplied by the BESEP or the user command.
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