Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 - Page 293

10.3 Protection
10.3.1. 3 minutes delay at restart for compressor.
10.3.2. Temperature protection of compressor top, compressor stops when the temp. of top of compressor is
more than 115℃, compressor runs when the temp. of top of compressor is less than 100℃.
10.3.3. Voltage protection, unit stop when the voltage is more than 260V and less than 175V.
10.3.4. Inverter module Protection , Inverter module Protection itself has a protection function against current,
voltage and temperature.
10.3.5. Sensor protection at open circuit and breaking disconnection
10.3.6. 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.
10.3.7. 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.
10.4 Fan-only mode
Fan speed is high/mid/low/ Auto
10.5. Cooling mode
10.5.1 The 4-way valve is closed at cooling mode.
10.5.2 The action of the compressor and the outdoor fan:
Condition
T=Indoor Temp.
Ts=Setting Temp.
Compressor Outdoor fan
T> Ts+1 On On Room temp. up
T<Ts+1 Off Off
T> Ts On On Room temp. down
T<Ts Off Off
10.5.3 Auto fan at cooling mode:
Condition
T=Indoor Temp.-Setting Temp.
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
10.5.4 Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
Evaporator Temp. Compressor
0℃<T< 4℃ Decrease frequency of compressor
T< 0℃ Off
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