Midea M3OC-27HRDN1-M - Electronic Control Functions

8. Electronic control function
8.1 Abbreviation
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet.
T3: Coil temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Setting temp.
8.2 Electric control working environment.
8.2.1 Input voltage: 230V.
8.2.2 Input power frequency:60Hz.
8.2.3 Indoor fan normal working amp. is less than 1A.
8.2.4 Outdoor fan. Normal working amp. is less than 1.5A.
8.2.5 Four-way valve normal working amp. is less than 1A.
8.2.6 Swing motor: DC12V.
8.3 Outdoor unit’s digital display tube
There is a digital display tube in outdoor PCB.
Digital display tube display function
• In standby , the LED displays “- -”
• In compressor operation, the LED display the running frequency,
• In defrosting mode, The LED displays “dF” or alternative displays between running frequency and
“dF”(each displays 2s)
• In compressor pre-heating, The LED displays “- -”
• In protection or malfunction, the LED displays error code or protection code.
8.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display tube will display
the follow procedure when push SW1 each time.
Display
Remark
1
Indoor unit capacity demand code
2
Outdoor unit running mode code
Off:0, Cooling:1, Heating:2
3
Amendatory capacity demand code
4
Outdoor unit fan motor state
Off:0, Low speed:1, High speed:2
5
Evaporator outlet temp. for 1# indoor unit
Actual data
6
Evaporator outlet temp. for 2# indoor unit
Actual data
7
Evaporator outlet temp. for 3# indoor unit
Actual data
8
Evaporator outlet temp. for 4# indoor unit
Actual data
9
Condenser pipe temp.
Actual data
10
Ambient temp.
Actual data
11
Compressor discharge temp.
Actual data
12
Inverter current
Actual data
13
EXV open angle for 1# indoor unit
Actual data divide 8