50HC17-28 WeatherMaster® High-Efficiency Single Package Rooftop Cooling Only with Optional Electric Heat, Optional EnergyX® Energy Recovery Device, and Puron (R-410A) Refrigerant 15 to 25 Nominal Tons 50HC17-28 WeatherMaster® High-Efficiency Single Package Rooftop Cooling Only with Optional Electric Heat, Optional EnergyX® Energy Recovery Device, and Puron (R-410A) Refrigerant 15 to 25 Nominal Tons