Midea MSH-07CRN1, MSH-07HRN1, MSH-09CRN1, MSH-09HRN1, MSH-12CRN1, MSH-12HRN1 Manual page 176

8. Electronic Control Principle of Large Cooling Capacity Split Model A/C
8.1 Fan only mode
Fan speed is high/mid/low/ Auto
8.2 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:
T: Room temp.
Ts: Setting temp.
Temp. up
Temp. down
Auto fan
Temp. up
Temp. down
Anti-freezing control to indoor evaporator
Temp. up
Temp. down
Condenser high temp. protection( only for heat pump)
Temp. up
Temp. down
8.3 Dehumidifying mode
8.3.1 Indoor fan speed at low speed.
8.3.2 Protection is same as cooling mode.
8.4 Heating mode
8.4.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode.
8.4.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode, except
for the defrosting mode or the end of defrost.
8.4.3 Action conditions of compressor at heating mode: compressor must run for 4 minutes after starting
and then judge temperature. Meanwhile other protections are still valid.
Room temp. up
Room temp. down
Condition
T> Ts+1
T<Ts+1
T> Ts
T<Ts
Condition(T=Indoor Temp.-Setting Temp.)
T<1¡ æ
1 <T< ¡ æ 4¡ æ
T>5¡ æ
T> 4¡ æ
1 <T< ¡ æ 4¡ æ
T<1¡ æ
Condition
Temp. Time
T> TE6
T< TE6 >4 Minutes
T> TE5
T< TE5 >4 Minutes
Temp. Condition
T> TE10
T< TE10
T> TE11
T< TE11
Condition
T> Ts+4
T<Ts+4
T< Ts+3
T>Ts+3
Compressor Outdoor fan
On On
Off Off
On On
Off
Indoor fan speed
Low
Med.
High
High
Med.
Low
Compressor
On
Off
On
Off
Compressor
Off
On
Off
On
Compressor Outdoor fan
Off Off
On On
On On
Off Off
110
Off
Outdoor fan
On
Off
On
Off