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7. Electric control functions:
7.1 Protection
1. 3 minutes delay at restart for compressor.
2. Temperature protection of compressor top, compressor stops when the temp. of top of
compressor is more than 120℃, compressor runs when the temp. of top of compressor is less
than 105℃.
3. When AC voltage ≥ 270V for 30 seconds, Outdoor Unit stops operation and alarms.
When AC voltage ≤ 260V for 30 seconds, Outdoor Unit resumes operation.
4. Inverter module protection, Inverter module Protection itself has a protection function
against current, voltage and temperature.
5. Sensor protection at open circuit and breaking disconnection.
6. Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High
Fan+300RPM)or too low(lower than 400RPM), the unit stops and LED displays failure
information and can’t return to normal operation automatically.
7. Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit
stops and LED displays failure information and can’t return to normal operation automatically.
8. Current protection: When the current is more than 25A, the compressor stops.
9. Outdoor condenser high temperature protection: Under cooling mode, if T3>65 for 3 ℃
minutes, the compressor will stop. When T3<52, the protection is not valid.℃
10. Outdoor low temperature protection: If the outdoor temperature is lower than -15 for ℃
1hour, the compressor and fan motor will stop. If the outdoor temperature is higher than -12℃
for 10 minutes and the compressor stops operation for 1h, or the outdoor temperature is
higher than 5℃ for 10 minutes, then restart and enter into the prior operation mode.
11. Compressor pre-heating function: When the outdoor temperature is lower than 3℃ and
the compressor stops operation for more than 3 hours, or the outdoor temperature is lower
than 3℃ and the power is just put on, the compressor enters into pre-heating condition. When
outdoor temp. is more than 5℃ or user operate it, pre-heating condition will finish.
7.2 Operating mode
7.2.1 Cooling mode
1.Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto:
2.Auto fan at cooling mode: (T=Indoor Temp.-Setting Temp.)
Condition Indoor fan speed
T<1.5℃ Low
1.5℃<T<4℃ Mid.
Room temp. up
T>4℃ High
T> 3℃ High
1<T<3℃℃ Mid.
Room temp. down
T<1℃ Low
3.Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
Evaporator Temp. Compressor
T< 4℃ Off
T > 8℃ On