The invention relates to control technologies of variable frequency air conditioners, discloses a control method for an outdoor
direct current fan of the variable frequency air conditioner, and solves the problem that in traditional technologies, the revolving speed of the outdoor
direct current fan of the variable frequency air conditioner cannot be matched with a
system optimally, and as a result, the capacity and the reliability of the
system are influenced. The method comprises the steps that the original revolving speed of the
direct current fan is determined according to the frequency of a compressor and the outdoor environment temperature; in the running process of the compressor, the revolving speed of the direct current fan is adjusted in real time according to current
system parameters, such as the outdoor coil temperature, the IPM temperature, the exhaust temperature and the environment temperature, and the stepless speed regulation function of the fan revolving speed is achieved; and after the compressor is stopped, the outdoor coil temperature and the IPM temperature are detected, whether the fan runs or not, the running speed of the fan and the
running time of the fan are determined according to the temperatures. According to the control method, compared with an original control scheme in which the fan is stopped when the compressor is stopped, the temperature of the corresponding system can be reduced rapidly, the method is beneficial to shortening the time of
system recovery due to the fact that the overheated system results in
shut down of the compressor, and the time interval of once again start of the compressor is shortened.