2024-390-E-AMS-Brady Services-WCOB Server Room HVAC

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Orange County West Campus Office Building -HVAC PDC Project 23020 In-Row Computer Room Air Conditioners 23 81 24.01 - 2 A.A field-adjustable,modular,supply-air baffle system shall be located in the discharge air stream on the front of the cabinet to direct air toward the equipment racks and balance air-flow requirements within the row.The five modular baffle segments shall be easily reconfigurable to redirect air flow as cooling requirements change.Controlling the air flow prevents hot spots and maintains high return-air temperatures by not blowing cold air over racks or out the ends of aisles.By focusing the cold air where it is needed and meeting the servers'requirements,the need for excessive airflow and energy consumption is eliminated. 2.05 CABINET CONSTRUCTION AND ACCESSIBILITY A.Cabinet Construction 1.The exterior panels of the unit shall be 20=gauge steel and powder-coated with charcoal color paint to protect against corrosion and follow Knürr rack appearance guidelines to mirror the style of neighboring equipment racks.The cabinet shall be mounted on casters for quick installation and provided with leveling feet.Both doors shall have a powder-coated sheet- metal frame with hexagonal perforations leaving 81%of the door open to air flow for efficient cooling.The front and rear doors shall swing 170 degrees open,shall be removable,and shall feature a two-point latch.The powder-coat painted steel side panels shall be lined with half-inch closed-cell polymeric insulation and secured using quarter-turn fasteners. B.Serviceability 1.The cabinet shall be designed so all components are easily accessible for service and maintenance through either the front or rear of the unit.Units that are not fully accessible from front and rear or not serviceable in place shall be unacceptable. 2.Side access shall not be required.Each of the variable-speed fans shall be individually replaceable through the front door of the unit.Units with a compressor and/or a condensate pump shall be conveniently mounted near the edge of the unit. C.Supply Air Baffle System 1.A field-adjustable,modular,supply-air baffle system shall be located in the discharge air stream on the front of the cabinet to direct air toward the server racks and balance air-flow requirements within the row.The five modular baffle segments shall be easily reconfigurable to redirect airflow as cooling requirements change.Controlling the air flow prevents hot spots and maintains high return-air temperatures by not blowing cold air over racks or out the ends of aisles.By focusing the cold air where it is needed and meeting the rack equipment’s cooling requirements,the need for excessive air flow and energy consumption is eliminated. 2.06 LOCKING DISCONNECT SWITCH A.A manual disconnect switch shall be mounted in the electrical panel and be capable of disrupting the flow of power to the unit.The electric-panel compartment shall be accessible only with the switch in the Off position.It shall be located behind the rear door for quick access. 2.07 SHORT CIRCUIT CURRENT RATING (SCCR) A.The electrical panel shall provide at least 65,000A SCCR. 2.08 FILTRATION A.MERV 8 1.The two filters shall be an integral part of the system,located within the cabinet and serviceable from the rear.The filters shall be washable,half-inch thick with an ASHRAE 52.2 MERV8 rating.A filter clog alarm shall be included. B.Extra Filter Set (Optional) 1.2 extra set(s)of filters shall be provided per system. 2.09 HEAT REJECTION A.Standard Features 1.The condenser shall consist of microchannel condenser coil(s),propeller fan(s)direct driven by individual fan motor(s),electrical controls,housing,and mounting legs.The Liebert®air- cooled condenser shall provide positive refrigerant head pressure control to the indoor cooling unit by adjusting heat rejection capacity.Microchannel coils shall provide superior Docusign Envelope ID: 8DED1454-68D2-4E36-9FC6-E56FF2124E5D