What is the toggle switch on the AC side?

The toggle switch is the switch of the fan, usually the fan will turn on by itself when the unit got very hot, sometimes if you think the temperature is high, you can also turn on the switch to make the fan run. As some freezer & refrigerator, when you turn it on, this appliance will need big amp in the first beginning, the transformer inside will get hot in the mini secs, so the sensor not faster enough to turn the fan on, so sometimes the fan not turn on the inverter shut down because the high faster hot coming, in this moment, you'd better put the manual switch for the fan to come down the temperature, that's why we make this special design.