Functions and control
16 Domestic air conditioner
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
400r
Tao（℃） Tao <<10℃ 10℃< Tao <17℃ Tao≥17℃
Heating
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency
of the compressor.
Refrigeration/dehumidification
frequency（Hz）
<
41 Hz 41 Hz -55 Hz
≥55 Hz
Tao（℃）
≤22
22-29
29-38
Heating frequency（Hz）
<65 Hz 65-85 Hz
≥85 Hz
Tao（℃）
≤10
10-17
≥17
600r
760r
800r 760r
400r
400r
500r
600r
500r
600r
760r
600r 800r 900r
≥38
900r
760r 760r 800r
600r 760r 800r
600r
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