Midea MCH2U-18PHH2 Service Manual page 19

Then modify it according to a T2 average
(correction):
Note:Average value of T2：Sum T2 value of
all indoor units)/ (indoor units number
℃ T2 average
47
40
Use the following table and final capacity
request to confirm
frequency.
Frequency
HEA
(Hz) 0 T_F
1
Amendatory
capacity
0 1
demand.
The maximum running frequency is
adjusted according to the outdoor ambient
temperature
Decrease frequency
Keep frequency
Increase frequency
the operating
HEA
HEA HEA
T
T ... T
_F2
_F2 _F24
5
2 ... 24 25
℃
34
33
28
27
25
24
22
21
19
18
17
16
15
14
12
11
6
5
1
0
-3
-4
-7
-8
-11
-12
-15
-16
6.4.2 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.
19
Standby
Fmax=T4FREHEATMAX1
Fmax=T4FREHEATMAX2
Fmax=T4FREHEATMAX3
Fmax=T4FREHEATMAX4
Fmax=T4FREHEATMAX5
Fmax=T4FREHEATMAX6
Fmax=T4FREHEATMAX7
Fmax=T4FREHEATMAX8
Fmax=T4FREHEATMAX9
Fmax=F21
Fmax=F22
Fmax=F23
Fmax=F24
Fmax=F25