Safety Features - Midea AURORA ONOFF Series Service Manual

2. Safety Features

Compressor three-minute delay at restart
Compressor functions are delayed for up to one minute upon the first startup of the unit, and are delayed for up to three
minutes upon subsequent unit restarts.
Zero crossing detection error protection(Except for DC fan units)
If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not correct, the unit will
stop and the LED will display the failure. The correct zero crossing signal time interval should be between 6-13ms.
Automatic shutoff based on fan speed
If the indoor fan speed registers below 300RPM for an extended period of time, the unit ceases operation and the
corresponding error code is displayed on the indoor unit.
Indoor fan delayed operation
• When the unit starts, the louver is automatically activated and the indoor fan will operate after a period of 4
seconds.
• If the unit is in heating mode, the indoor fan is regulated by the anti-cold wind function.
Sensor redundancy and automatic shutoff
If one temperature sensor malfunctions, the air conditioner ceases operation.
Refrigerant leakage detection
This function is active only when cooling mode is selected. It will detect if the compressor is being damaged by
refrigerant leakage or by compressor overload. This is measured using the coil temperature of evaporator T2 when the
compressor is in operation.
 Product Features 3 