Haier 1U35YEFFRA-C, Service Manual

Page: 17 / 67

Functions and control
17
Domestic air conditioner
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 <28 Tao 28
Refrigeration/dehumidification
(09K)
3rd level 5th level 7th level
Tao Tao <<10 10 < Tao <17 Tao 17
Heating level
level
3rd level
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency of the
compressor.
Refrigeration/dehumidification
frequency Hz 09K
<41 Hz
41 Hz -55 Hz 55 Hz
Tao
22
2nd level 3rd level 5 th level
22-28 3rd level 5 th level 7 th level
28
7 th level
Heating frequency Hz
(09K)
<51 Hz 51-71 Hz 71 Hz
Tao
10
5th level 7th level 7th level
10-17 3rd level 4 th level 5th level
17 2nd level
7th
5th