7.3 Main Protection
7.3.1 Time Delay at restart for compressor.
7.3.2 Sensor protection at open circuit and breaking disconnection.
7.3.3 Zero crossing detection error protection
If AC can not detect zero crossing signals for 4 minutes or the zero crossing signal time intervals 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.
7.3.4 Fan Speed is out of control
When Indoor Fan Speed is too low(lower than 300RPM) lasting certain time, the unit stops and LED
displays failure information and can’t returns to normal operation automatically.
7.3.5 Current protection
A
B
C
Resume
The current exceeds setting value for certain time, the compressor and outdoor fan will shut off.
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