Haier 1U35MEHFRA-1 Service Manual page 17

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 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
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
22-29
Tao
29-37
Heating frequency Hz
Tao
10-17
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)
Tao <22
610rpm
Tao <<10
760rpm
<38 Hz
22 610rpm
610rpm
810rpm
37
<45 Hz
10
760rpm
520rpm
17
22 < Tao <28
610rpm
10 < Tao <17
520rpm
38 Hz -56 Hz
610rpm
710rpm
810rpm
860rpm
45-70 Hz
860rpm
760rpm
520rpm
Domestic air conditioner
17
Functions and control
Tao 28
610rpm
Tao 17
400rpm
56 Hz
610rpm
800rpm
860rpm
70 Hz
900rpm
760rpm