50A WEATHERMAKER® Packaged Rooftop Electric Cooling Units With Puron® Refrigerant (R-410A) 20 to 60 Tons 50A2 - CV, Vertical 50A3 - VAV, Vertical 50A4 - CV, Horizontal 50A5 - VAV, Horizontal 48/50A Rooftop Carrier "A" Series Rooftop products are pre-wired and charged with refrigerant and tested in both cooling and heating modes at the factory. All 50A models feature an industrial grade cabinet with fully hinged access panels. Superior supply fan performance with up to 3.5 in. external static pressure is standard. They are available in dedicated vertical down shot and horizontal side supply/return airflow models. There are "A" Series models available for Constant Volume or Variable Air Volume applications. Units are available as cooling-only or with a variety of electric heat options. All "A" Series units come standard with ComfortLink™ control and Scroll compressors on dual independent TXV controlled refrigeration circuits