Electric motor has been equipped with a low-noise all enclosed fan cooler, making it possible to use both indoors and outdoors.Direct acting electric motor results in elimination of vibration noise from direct connection failure.Suction and expulsion piping, thermal insulation and built-up frost may be inspected and decomposed, without disassembly, through the BPO（Back Pull Out）structure.Integrated mechanical seal to the shaft seal, making maintenance easy.