Midea M3OF-27HFN1-M - Defrosting Control

19
Note:Average value of T2：Sum T2 value of all
indoor units)/ (indoor units number
℃
T2 average
Decrease frequency
47
Keep frequency
40
Increase frequency
Use the following table and final capacity
request to confirm the operating frequency.
Frequency (Hz)
0
HEAT
_F1
HEAT
_F2
…
HEAT
_F24
HEAT
_F25
Amendatory
capacity
demand.
0
1
2
…
24
25
The maximum running frequency is adjusted
according to the outdoor ambient temperature
℃
34
33
Standby
28
27 Fmax=T4FREHEATMAX1
25
24 Fmax=T4FREHEATMAX2
22
21 Fmax=T4FREHEATMAX3
19
18 Fmax=T4FREHEATMAX4
17
16 Fmax=T4FREHEATMAX5
15
14 Fmax=T4FREHEATMAX6
12
11 Fmax=T4FREHEATMAX7
6
5 Fmax=T4FREHEATMAX8
1
0 Fmax=T4FREHEATMAX9
-3
-4 Fmax=F21
-7
-8 Fmax=F22
-11
-12 Fmax=F23
-15
-16 Fmax=F24
Fmax=F25
5.4.2 Defrosting Control
Conditions for Defrosting:
After the compressor starts and enters normal
operation, mark the minimum value of T3 from
the 10th to 15th minute as T30.
If any one of the following conditions is satisfied,
the unit enters defrosting mode:
1) If the compressor’s cumulative running time
reaches 29 minutes and T3< TCDI1 and T3＋
T30SUBT3ONE≦T30.
2) If the compressor cumulative running time
reaches 35 minutes and T3< TCDI2 and T3＋
T30SUBT3TWO≦T30.
3) If the compressor cumulative running time
reaches 40 minutes and T3< -24C for 3 minutes.