Single-Package High-Efficiency Electric Cooling Rooftop Units with Puron® Refrigerant (R-410A) 75 to 150 Nominal Tons 50N2 – Vert Supply/Return CV or SAV 50N3 – Vert Supply/Return VAV 50N4 – Horz Supply/Return CV or SAV 50N5 – Horz Supply/Return VAV 50N6 – Vert Supply/Return CV or SAV 50N7 – Vert Supply/Horz Return VAV 50N8 – Horz Supply/Vert Return CV or SAV 50N9 – Horz Supply/Vert Return VAV 48/50N Series Unit Icon Carrier N Series rooftop units are pre-wired and factory-tested in both cooling and heating modes. All 50N models feature a double wall foam panel cabinet design with hinged man-sized access panels. The standard airfoil supply fan or the optional high static airfoil supply fan will provide the necessary static pressure for today’s complex building applications and highly featured units. Units are available in dedicated vertical, horizontal, and mixed supply/return airflow configurations for constant volume (CV), staged air volume (SAV), or variable air volume (VAV) applications. A wide variety of gas heating options are also available. Units come with the ComfortLink™ DDC (direct digital control) communicating control system and hermetic scroll compressors on dual independent refrigeration circuits. The refrigerant circuits are controlled via Electronic Expansion Valves (EXV).