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
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
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.