7.3 Main Protection
7.3.1 Time Delay at restart for compressor.
Less than 1 minute delay for the 1
st
time
start-up and 3 minutes delay for others.
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 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.
7.3.4 Fan Speed is out of control
When Indoor Fan Speed is too low(lower than
300RPM) lasting 2 minutes, 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.
7.3.6 Indoor fan delayed open function
When the unit starts up, the indoor fan will open
4s later.If the unit runs in heating mode, the
indoor fan will be also controlled by anti-cold
wind function.
7.3.7 Refrigerant leakage detection
This function is only active in cooling mode. It
can better prevent the compressor being
damaged by refrigerant leakage or compressor
overload.
Open condition:
When compressor is active, the value of the
Coil temperature of evaporator T2 has no
change or very little change.
