... reasonable design, excellent quality 2.copeland semi-hermetic compressor 3.R22,R404a,R407C,R134a 1. Semi-hermetic piston ... .0Z, NJ-BF5.0Z:Copeland semi-hermetic piston compressor, oil separators, air-cooled condenser, axial flow fan, liquid reservoir, ... NJ-BF20Z, NJ-BF25Z:Copeland semi-hermetic piston compressor, oil separators, air-cooled condenser, axial flow fan, liquid reservoir, ...