Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 - Page 59

8.4 Protection
8.4.1 The compressor functions protection with a delay of three minutes.
8.4.2 High temp. protection of condenser.
8.4.3 Sensor protection at open circuit and breaking disconnection
8.4.4 Temperature Fuse break protection
8.4.5 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 entire unit stops and LED displays
failure information and can’t returns to normal operation automatically.
8.5 Fan-only mode
Fan speed is high/mid/low/ Auto
8.6 Cooling mode
The 4-way valve is closed under cooling mode.
The action of the compressor and the outdoor fan:
Condition Compressor Outdoor fan
TA> Ts+1 On On Temp. up
TA<Ts+1 Off Off
TA> Ts On On Temp. down
TA<Ts Off Off
Auto fan under cooling mode:
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<3℃ Low
3℃<T<5℃ Med.
Temp. up
T>5℃ High
T> 3℃ High
1℃<T<3℃ Med.
Temp. down
T<1℃ Low
Anti-freezing control to indoor evaporator under cooling mode
Condition
Temp. Time
Compressor Outdoor fan
T> TE6 On On Temp. up
T< TE6 >5 Minutes Off Off
T> TE5 On On Temp. down
T< TE5 >5 Minutes Off Off
Condenser high-temperature protection under heating mode
T3 >65℃, turn off compressor.
8.7 Dehumidifying mode
8.7.1 The 4-way valve is off in dehumidifying mode
8.7.2 Compressor and Indoor Fan actions in dehumidifying mode
Compressor run 5 minutes , and indoor fan run 5 minutes in low speed, then turn off the
compressor, indoor fan run 5 minutes in low speed. And repeat on and off cycle.
8.7.3 Low room temperature protection:
When room temperature decreases to below 10℃, the compressor and the outdoor fan
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