... problem,easy for maintenance.4. World famous brand compressor,4-way valve,motor,PCB,heat exchanger,Emerson ALCO ... (COPELAND or Sanyo)Water side heat exchanger TypeTube-Tube typeAir side heat exchanger TypeHigh efficiency copper tube(Interior Screw ... (COPELAND or Sanyo)Water side heat exchanger TypeTube-Tube typeAir side heat exchanger TypeHigh efficiency copper tube(Interior Screw ...