Haier 1U35YEGFRA 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
(12K)
Tao
Heating
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency of the
compressor.
Refrigeration/dehumidification
frequency Hz 12 K
22
Tao
22-29
29
Heating frequency Hz
(12K)
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)
Tao <22
400r/min
Tao <<10
800r/min
<41 Hz
400r/min
500r/min
<61 Hz
760r/min
600r/min
22 < Tao <29
600r/min
10 < Tao <17
760r/min
41 Hz -62 Hz
500r/min
600r/min
760r/min
61-74 Hz
760r/min
760r/min
600r/min
Domestic air conditioner
17
Functions and control
Tao 29
760r/min
Tao 17
400r/min
62 Hz
600r/min
760r/min
74 Hz
800r/min
800r/min