Prior to the introduction of AHRI Standard 920, the industry experienced confusion on what direction to take when selecting and specifying DX Dedicated Outdoor Air System (DX-DOAS) units used to dehumidify 100% outdoor air for ventilation to a low dew point.
Common engineering practice in the past has been to apply AHRI Standard 340/360; however, this standard has shortcomings as it pertains to gauging the true performance of a DX DOAS unit. The purpose of this paper is to clarify these issues by examining the objectives of each standard and outlining their differences. The document equips HVAC industry professionals with the necessary understanding to effectively apply the appropriate standards for specifying and rating DX-DOAS units.
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