Functions and control
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 fan control
Within three minutes of compressor starting, the compressor is controled according to the ambient temperature.
Tao
Tao <22
22 < Tao <28
Tao 28
Refrigeration/dehumidification
610rpm
610rpm
760rpm
Tao
Tao <<10
10 < Tao <17
Tao 17
Heating
760rpm
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency of the
710rpm
610rpm
compressor.
Refrigeration/dehumidification
<31 Hz
31Hz -49Hz
49 Hz
frequency Hz
22
510rpm
610rpm
610rpm
22-29
510rpm
610rpm
710rpm
Tao
29-38
580rpm
680rpm
760rpm
38
760rpm
Heating frequency Hz
<61 Hz
61-86Hz
86Hz
10
680rpm
760rpm
760rpm
Tao
10-17
610rpm
710rpm
760rpm
17
610rpm
17
Domestic air conditioner
