racticing to have performance test after making real wire.(But, the real wire trainer should be connected with air-conditioning system, refrigeration system, freezing system, binary refrigeration system, and heat pump refrigeration system).
racticing to make basic circuit and practical circuit in wiring power,electric step by step.
Practicing to make circuit about that is controlled by every electric control valves as like magnet contactor switch(MC), relay(Ry), push butten switch(PB), select switch(S/SW), toggle switch(T/S), buzzer(BZ), timer(Timer), defrost timer(D.T), power lamp(PL),operation lamp(PL), stop lamp(GL) with several kind of circuits.