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![General The liquid source Reversible Chiller water to water heat pump shall be a single packaged reverse-cycle heating/cooling unit. The unit shall be listed by a nationally recognized safety-testing laboratory or agency, such as ETL Testing Laboratory, Underwriters Laboratory (UL), or Canadian Standards Association (CSA). The unit shall be rated in accordance with American Refrigeration Institute / International Standards Organization (ARI / ISO) and Canadian Standards Association (CSA-US). The liquid source Reversible Chiller water to water heat pump unit, as manufactured by WFI, Fort Wayne, Indiana, shall be designed to operate with source liquid temperatures between 30°F [-1.1°C] and 90°F [32.2°C] in cooling, and between 60°F [16°C] and 120°F [49°C] in heating.](http://www.system-maintenance.com/maint/images/T/icon_pdf_sm-04.jpg){kind=icon}
