Midea M3OF-27HFN1-M - Control and Functions

18
If the outdoor ambient temperature is higher than
the set frequency during oil return, the unit stops
the oil return process.
5.3.11 Low Outdoor Ambient Temperature
Protection
When the compressor is off and T4 is lower than -
35℃ for 10 seconds, the unit stops and displays
“LP.”
When the compressor is on and T4 remains lower
than -40℃ for 10 seconds, the unit stops and
displays “LP.”
When T4 is no lower than -32℃ for 10 seconds,
the unit exits protection.
5.4 Control and Functions
5.4.1 Capacity Request Calculation
Cooling Mode:
T1 Ts
3
1
1
e
c
a
4
2
0
2
3
0
1
f
d
b
Capacity area
a
b
c
d
e
f
Norm code (N)
3
2
1.5
1
0.5
0
Model
9K
12K
18K
24K
HP
1.0
1.2
1.5
2.5
Note: The final result is an integer.
Use the following table and final capacity
request to confirm the operating frequency.
Frequency (Hz)
0
COO
L_F1
COO
L_F2
…
…
COOL
_F24
COO
L_F2
5
Amendatory
capacity
demand.
0
1
2
…
…
24
25
The maximum running frequency is adjusted
according to the outdoor ambient temperature
℃
55
54
Fmax= T4FREMAXC0
51.5
50.5
Fmax= T4FREMAXC1
45.5
44.5
Fmax= T4FREMAXC2
39
38
Fmax= T4FREMAXC3
33
32
Fmax= T4FREMAXC4
30
29
Fmax= T4FREMAXC5
22
20
Fmax= T4FREMAXC6
10
8
Fmax= T4FREMAXC7
0
-2
Fmax= T4FREMAXC8
-10
-12
Fmax= T4FREMAXC9
Fmax= T4FREMAXC10
Heating Mode
T1 Ts
4
0
a
3
1
-1
3
1
2
0
b
c
d
e
f
2
Capacity area
a
b
c
d
e
f
Norm code (N)
3
2
1.5
1
0.5
0
Model
9K
12K
18K
24K
HP
1.0
1.2
1.5
2.5
Note: The final result is an integer.
Then modify it according to a T2 average
(correction):