HP Integrity Superdome SX1000 User Manual page 152

Site Preparation
Electrical and Environmental Guidelines
An air distribution system should be zoned to deliver an adequate amount of supply air to the cooling air
intake vents of the computer system equipment cabinets. Supply air temperature should be maintained
within the following parameters:
• Ceiling supply system—From 55 F (12.8 C) to 60 F (15.6 C)
• Floor supply system—At least 60 F (15.6 C)
If a ceiling plenum return air system or a ducted ceiling return air system is used, the return air grille(s) in
the ceiling should be located directly above the computer equipment cabinets.
The following three types of air distribution system are listed in order of recommendation:
• Underfloor air distribution system—Downflow air conditioning equipment located on the raised floor of
the computer room uses the cavity beneath the raised floor as plenum for the supply air.
Return air from an underfloor air distribution system can be ducted return air (DRA) above the ceiling, as
shown in Figure 5-3 on page 142.
Perforated floor panels (available from the raised floor manufacturer) should be located around the
perimeter of the system cabinets. Supply air emitted though the perforated floor panels is then available
near the cooling air intake vents of the computer system cabinets.
• Ceiling plenum air distribution system—Supply air is ducted into the ceiling plenum from upflow air
conditioning equipment located in the computer room or from an air handling unit (remote).
The ceiling construction should resist air leakage. Place perforated ceiling panels (with down discharge
air flow characteristics) around the perimeter of the system cabinets. The supply air emitted downward
from the perforated ceiling panels is then available near the cooling air intake vents of the computer
system cabinets.
Return air should be ducted back to the air conditioning equipment though the return air duct above the
ceiling.
• Above ceiling ducted air distribution system—Supply air is ducted into a ceiling diffuser system from
upflow air conditioning equipment located in the computer room or from an air handling unit (remote).
Return air from an above ceiling ducted air distribution system may be ducted return air (DRA) above the
ceiling, as shown in Figure 5-5 on page 144, or ceiling plenum return air (CPRA), as shown in Figure 5-4
on page 143.
Adjust the supply air diffuser system grilles to direct the cooling air downward around the perimeter of
the computer system cabinets. The supply air is then available near the cooling air intake vents of the
computer system cabinets.
Air Conditioning System Installation All air conditioning equipment, materials, and installation must
comply with any applicable construction codes. Installation of the various components of the air conditioning
system must also conform to the air conditioning equipment manufacturer's recommendations.
Figure 5-3 on page 142 illustrates a typical computer room underfloor air distribution system (DRA).
Figure 5-4 on page 143 illustrates a typical computer room ceiling plenum air distribution system (CPRA).
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Chapter 5