COMPUTER ROOM AIR CONDITIONING UNITS (CRACU)

be permitted.

PART 2

PRODUCTS

2.1

COMPUTER ROOM AIR CONDITIONING UNITS (CRACU)

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NOTE: The indoor components of CRACU are inherently

noisy. In noise sensitive areas, designers should

take steps to attenuate CRACU generated sound.

Determine the maximum acceptable sound level limit

for the application in NC level or dbA and add the

limit to the CRACU equipment schedule. This sound

level compliance may be verified by the CRACU

factory and field tests.

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NOTE: Designers should locate the floor registers

in a raised floor system as far from the CRACU as

possible to reduce direct sound transmission from

the unit to the conditioned space.

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NOTE: Designers should indicate the mandatory

routing of piping around the floor stand of a

downflow CRACU in their piping plan view and piping

details. Ensure, by dimensioning of piping details,

that no piping interferes with the air flow

performance of the CRACU.

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ASHRAE 15. Provide self-contained units, designed, [and] factory

assembled[, and factory tested]. Unit shall be listed in UL Elec Equip Dir

or ETL DLPfor computer room application. Unit shall include room cabinet

and frame, [floor stand, ]fan section, filter section, cooling coil, reheat

coil, humidifier, [compressors], [condensers], controls, and,

interconnecting piping internal to the CRACU.

2.1.1

Cabinet and Frame

2.1.1.1

Unit Cabinet

Unit frame shall be minimum 14 gage 2.0 millimeter welded steel tubes or

steel angles and shall be mill-galvanized or coated with an epoxy finish,

or an approved manufacturer's standard finish, if equivalent.

Exterior panels shall be furniture grade steel sheet, minimum of 20 gage

1.0 mm, mill-galvanized or coated with a corrosion-inhibiting epoxy finish,

or an approved equivalent finish. Mill galvanized sheet metal shall be

coated with not less than 1.25 ounces of zinc per square foot 380 gram of

zinc per square meter of two-sided surface. Mill rolled structural steel

shall be hot-dip galvanized or primed and painted. Cut edges, burns and

scratches in hot-dip galvanized surfaces shall be coated with galvanizing

repair coating.

Provide removable panel for access to controls without interrupting

airflow. Panels shall be gasketed to prevent air leakage under system

SECTION 15702N

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