Single-Package Rooftop High Efficiency Electric Cooling Units with Optional Electric Heat 3 to 25 Nominal Tons 50HC WEATHERMASTER® rooftop unit were designed by customers for customers. With a gauge plug, centralized control center, plug & play accessory board, "no-strip screw" collars, and handled access panels, we’ve made the unit easy to install, easy to maintain, and easy to use. Units are pre-wired and pre-charged with environmentally sound Puron® (R-410A) refrigerant at the factory. The units are factory tested in cooling mode. Performance Features Puron® (R-410A) HFC refrigerant ASHRAE 90.1 and Energy Star compliant Single-stage capacity control (sizes 04 to 07) Two-stage cooling capacity control (sizes 08 to 28) SEERs up to 15.6 EERs up to 12.2 IEERs up to 13.4 Exclusive non-corrosive composite condensate pan in accordance with ASHRAE 62 Standard, sloping design; side or center drain Pre-painted exterior panels and primer-coated interior panels tested to 500 hours salt spray protection TXV refrigerant metering device on each circuit with removable power element Fully insulated cabinet