Protection; Fan-Only Mode; Cooling Mode - Midea MSV1-09HRDN1 Service Manual

11.2. Protection

11.2.1. 3 minutes delay at restart for compressor.
11.2.2. 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℃.
11.2.3. Voltage protection, unit stop when the voltage is more than 260V and less than 175V.
11.2.4. Inverter module Protection, Inverter module Protection itself has a protection function against
current, voltage and temperature.
11.2.5. Sensor protection at open circuit and breaking disconnection
11.2.6. Fan Speed is out of control. When Indoor Fan Speed is too high (higher than 2100RPM) or too
low (lower than 300RPM), the unit stops and LED displays failure information and can't return to
normal operation automatically.
11.2.7. 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.

11.3. Fan-only mode

Fan speed is high/mid/low/ Auto

11.4. Cooling mode

11.4.1. The 4-way valve is closed at cooling mode.
11.4.2. The action of the compressor and the outdoor fan:
Room temp. up
Room temp. down
11.4.3 Auto fan at cooling mode:
Room temp. up
Room temp. down
11.4.4 Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
11.4.5 Current protection
Current up
Current down
11.4.6 Rated capacity test
Set mode to cooling mode
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Service manual
Condition
T=Indoor Temp.
T> Ts+1
T<Ts+1
T> Ts
T<Ts
Condition
T=Indoor Temp.-Setting Temp.
T<1.5℃
1.5℃<T<4℃
T>4℃
T> 3℃
1℃<T<3℃
T<1℃
Evaporator Temp.
0℃<T< 4℃
T< 0℃
Model Current
MSH-18HRIN1 I>18 A
14.5A<I<18A
I< 12.0A
MSH-18HRIN1 I>17.5 A
14.0A<I<17.5A
I< 11.5A
Compressor
On
Off
On
Off
Indoor fan speed
Compressor
Decrease frequency of compressor
Off
Compressor
Off
Decrease frequency of
compressor
On
Off
Decrease frequency of
compressor
On
Outdoor fan
On
Off
On
Off
Low
Mid.
High
High
Mid.
Low