Midea M3OD-27HRDN1-M - System Control Logic

Meanwhile the maximum running frequency will
be adjusted according to the outdoor ambient
temp.
43
41
38
T4LimFre1_ADD
No limit
T4LimFre2_ADD
T4LimFre3_ADD
42
39
37
49
46
T4LimFre4_ADD
T4LimFre5_ADD
48
45
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
HP
1.0
1.2
1.5
Plus all the indoor capacity request together,
then modify it by T4
When there’s only one indoor unit
Heating
Outdoor temperature (T4)
＜0℃
＜12℃
12℃ ~ 17℃
≥17℃
Modify rate
120%
80%
40%
20%
When there’re more than one indoor unit
Heating
Outdoor temperature (T4)
＜0℃
＜12℃
12℃ ~ 17℃
≥17℃
Modify rate
120%
100%
80%
60%
Note: The final result is integer.
Then modify it according to T2
average(correction):
Note:Average value of T2：Sum T2 value of all
indoor units)/(indoor units number
According to the final capacity request to
confirm the operating frequency, as following
table.
Frequency (Hz)
0
HEAT
_F1
HEAT
_F2
…
HEAT
_F15
HEAT
_F16
Amendatory
capacity
demand.
0
1
2
…
15
16
Heating capacity improved in low ambient
heating
In heating mode, when
T2<T2_ExitT4LowFre_ADD , and T4<-4 ℃,
there’s frequency elevation:
elevated frequency= Recent frequency * 110%
When T2> T2_ExitT4LowFre_ADD-2 and T4>-6,
the highest frequency can’t exceed F17
When T2> T2_ExitT4LowFre_ADD-4 and T4>-8,
the highest frequency can’t exceed F18
When T2> T2_ExitT4LowFre_ADD-6 and T4>-10,
the highest frequency can’t exceed F19