Haier AS25THMHRA-C, Service Manual

Page: 358 / 537

Functions and control
When refrigerating, it is needed to satisfy
F-MIN-d(compressor’s Min_hz)< F<F-MAX-d(compressor’s Max_hz)
When heating, it is needed to satisfy
F-MIN-r (compressor’s Min_hz)< F<F-MAX-r (compressor’s Max_hz)
PID control :
The innital frequency Sn is determined by Pn . We can calculate Hzoutf according to the value of
Kp ,Ki ,Kd, Out_gain,Pn.Then , Fn = Sn + Hzoutf. The value of Fn is calculated in each sample time (60
seconds),and Fn is adujusted
●
according to previous frequency of Sn and filtered output of Hzoutf.
7.1.2 The outdoor fan control (Exchange fan)
When the fan is
●
changed among every airflow speed (including stop blowing), in order to avoid the
airflow speed from skipping frequently, it must be kept under each mode for over 30 seconds, and then
●
it can be changed to another mode (when refrigerating, the time is changed to 15 seconds).
7.1.2.1 The outdoor DC fan control
Within three minutes of compressor starting, the compressor is controled according to the ambient
temperature.
Tao
（℃）
Tao <22
℃
22
℃
< Tao <29
℃
Tao
≥
29
℃
Refrigeration/dehumidification 500rpm 600rpm 700rpm
Tao
（℃）
Tao <<10
℃
10
℃
< Tao <16
℃
Tao
≥
16
℃
Heating
800rpm 760rpm 400rpm
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency
of the compressor.
Refrigeration/dehumidification <51 Hz 51-70 Hz
≥
70 Hz
frequency
（
Hz
）
≤
22 500rpm 600rpm 700rpm
22 22- 29
500rpm 600rpm 760rpm
Tao
（℃）
29-38
600rpm
700rpm 800rpm
≥
38
800rpm
Heating frequency
（
Hz
）
<51 Hz 51-90 Hz
≥
90 Hz
≤
10
760rpm
850rpm 950rpm
Tao
（℃）
10
●
-17
400rpm
760rpm 800rpm
≥
17 400rpm
16
Domestic air conditioner