_:vb50768633 . _:vb50768633 . . "Device that, on proper variable sensing, initiates control signals or actions to conserve energy. A control system that reduces the mechanical heating and cooling requirement."@en . _:vb50768630 _:vb50767579 . _:vb50768631 _:vb50768630 . _:vb50767579 . _:vb50767579 . _:vb50767579 . _:vb50768632 . . . . _:vb50768630 _:vb50768632 . _:vb50768632 _:vb50768633 . "Economizer" . . _:vb50768633 . _:vb50768631 . _:vb50767579 . _:vb50768633 .