Power wire 1: Red  connect to positive pole +72V                   2: Black Connect to negative pole -72V Signal wire 1: Red 1st gear 2500R/Min control wire                   2: Black  Common port                   3: Orange 3rd gear4500R/Min control wire                   4: Green 2nd gear 3500R/Min control wire                   5: NC Undefined                   6: NC Undefined Connect red and black is 1st gear; Connect green and black is 2nd gear Connect orange and black is 3rd gear; Refrigerant: R134A/R1234YF