HP Integrity rx2620 Site Preparation Guide. First Edition - HP Integrity rx262 - Page 25

General Site Preparation Guidelines Environmental Elements • The system should be capable of handling any future hp Integrity rx2620 Server expansion. • Air conditioning equipment air filters should have a minimum rating of 45% (based on "ASHRAE Standard 52-76, Dust Spot Efficiency Test"). • Introduce only enough outside air into the system to meet building code requirements (for human occupancy) and to maintain a positive air pressure in the computer room. Air Conditioning System Types The following three air conditioning system types are listed in order of recommendation: • Complete self-contained package unit(s) with remote condenser(s). These systems are available with up or down discharge and are usually located in the computer room. • Chilled water package unit with remote chilled water plant. These systems are available with up or down discharge and are usually located in the computer room. • Central station air handling units with remote refrigeration equipment. These systems are usually located outside the computer room. Basic Air Distribution Systems A basic air distribution system includes supply air and return air. An air distribution system should be zoned to deliver an adequate amount of supply air to the cooling air intake vents of the hp Integrity rx2620 Server 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 grill(s) in the ceiling should be above the exhaust area or the exhaust row. 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 a plenum for the supply air. Return air from an underfloor air distribution system can be ducted return air (DRA) above the ceiling. Perforated floor panels (available from the raised floor manufacturer) should be located around the front of the system cabinets. Supply air emitted though the perforated floor panels is then available near the cooling air intake vents of the hp Integrity rx2620 Server 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 front 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 hp Integrity rx2620 Server 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). Chapter 2 25