Haier 1U68MRAFRA-4 Service Manual page 18

When refrigerating, it is needed to satisfy
When heating, it is needed to satisfy
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
7.1.2 The outdoor fan control (Exchange fan)
When the fan is
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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（℃）
Refrigeration/dehumidification
Tao（℃）
Heating
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency
of the compressor.
Refrigeration/dehumidification
frequency（Hz）
≤22
22 22-29
Tao（℃）
29-38
≥38
Heating frequency（Hz）
≤10
Tao（℃）
10 -17
●
≥17
F-MIN-d(compressor's Min_hz)< F<F-MAX-d(compressor's Max_hz)
F-MIN-r (compressor's Min_hz)< F<F-MAX-r (compressor's Max_hz)
according to previous frequency of Sn and filtered output of Hzoutf.
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changed among every airflow speed (including stop blowing), in order to avoid the
●
Tao <22℃
500rpm
Tao <<10℃
800rpm
<51 Hz
500rpm
500rpm
600rpm
<51 Hz
760rpm
400rpm
22℃< Tao <29℃
600rpm
10℃< Tao <16℃
760rpm
51-70 Hz
600rpm
600rpm
700rpm
800rpm
51-90 Hz
850rpm
760rpm
400rpm
16
Functions and control
Tao≥29℃
700rpm
Tao≥16℃
400rpm
≥ 70 Hz
700rpm
760rpm
800rpm
≥90 Hz
950rpm
800rpm
Domestic air conditioner