ANSI AHRI 430-2009 pdf download.Performance Rating of Central Station Air-Handling Units
2.1 Scope. This standard applies to central station air-handling units, as defined in Section 3.
2.1.1 This standard applies to supply fan ratings for double width double inlet (DWDI) housed fans, axial fans, and full opening axial discharge plenum fans in a cabinet.
2.2 Exclusions.
2.2.1 This standard does not apply to forced-circulation, free-delivery air-coolers for refrigeration, which are covered in AHRI Standard 420.
2.2.2 This standard does not apply to unit heaters intended for free delivery of heated air or to room fan-coils as defined in AHRI Standard 440.
2.2.3 This standard does not apply to units that have direct expansion coils incorporated by the manufacturer in a matched split system air-conditioner, or as otherwise defined in the product scope definition of the AHRI Unitary Small Equipment and Unitary Large Equipment Sections and covered in AHRI Standard 210/240 or in AHRI Standard 340/360.
2.2.4 This standard does not apply to unit ventilators as defined in AHRI Standard 840.
All terms in this document will follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defined in this section.
3.1 Central Station Air-Handling Unit (CSAHU). A factory-made encased assembly consisting of a fan or fans and other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air. It shall not contain a source of cooling. This assembly is capable of use with duct work having a total static resistance of at least 0.5 in H 2 O [0.1 kPa].
3.1.1 Blow-Through Central Station Air-Handling Unit (Figure 1). A unit containing a fan that does not have a ducted fan outlet.
3.1.2 Draw-Through Central Station Air-Handling Unit (Figure 2). A unit that has a ducted fan outlet.
3.1.3 Supply Fan. The fan that provides enough energy to overcome the supply air restriction and some or all of the return air restriction to provide tempered air into the conditioned space.
3.1.4 Horizontal Shaft. A fan shaft that is parallel to the ground.
3.1.5 Vertical Shaft. A fan shaft that is perpendicular to the ground.
3.2 Unit Appurtenances. Equipment added to Central Station Air-Handling Units for purposes of control, isolation, safety,static pressure regain, wear, etc. Such appurtenances include coils, filters, dampers, air-mixers, spray assemblies,eliminators, etc.
3.3 Published Rating. This standard covers defined fan arrangements in a unit casing. A published rating is a statement of the assigned values of those performance characteristics, under stated Rating Conditions, by which a unit may be chosen to fit the application. These values apply to all units of like nominal capacity and type (identification) produced by the same manufacturer. As used herein, the term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by the manufacturer, at stated Rating Conditions. 3.3.1 Application Rating. A rating based on fan in unit casing tests, with defined appurtenances, performed at application Rating Conditions (other than Standard Rating Conditions).
3.3.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions.
3.4 Rating Conditions. Any set of operating conditions under which a single level of performance results, and causes only that level of performance to occur.
3.4.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics.ANSI AHRI 430-2009 pdf download
