Efficient step/stepless control, convenience for operation and inspection One-touch setup function (choosing the maker automatic setup according to their basic spec) (Bitzer, Hitachi, Refcomp, Fusheng, Hanbell, Mitsubishi, Roltec and Kobe) Strong timer function (step delay, start delay, auto-stop delay, restart delay and pump down delay) Temperature control, pressure control (input temperature, output temperature, intake pressure control, discharge gas temperature control and observation)