Ultra High Efficiency Single Package Electric Cooling with Optional Electric Heat Rooftop Units with Puron® Refrigerant (R-410A) Novation™ Heat Exchanger Technology 18 to 25 Nominal Tons 50PM units are single-package, ultra high efficient electric cooling with optional electric heat rooftop units with Novation™ Heat Exchanger Technology condenser coils. These units provide Carriers best life cycle operation with high operating efficiencies, ease of maintenance, installability, and reliability. Units come pre-wired and pre-charged with Puron® (R-410A) environmentally sound refrigerant at the factory. Units are fully factory tested. Performance Features Novation Heat Exhanger Technology Puron (R-410A) HFC refrigerant EERs up to 12.0 IEER up to 12.4 Low sound levels as low as 92 dB Multi-stage capacity control on all models TXV refrigerant metering system on each circuit Cooling operation up to 125° F ambient Foil faced insulation encapsulated throughout entire unit minimizes airborne fibers from the air stream Dedicated compressor compartment for lower sound ratings and no air bypass Internally sloped condensate pan conforms to ASHRAE 62 standard