Haier 1U35YEGFRA, Service Manual

Page: 17 / 67

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