Haier AS25THMHRA-C Service Manual page 102

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
(09K)
Tao
Heating
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency of the
compressor.
Refrigeration/dehumidification
frequency Hz 09K
Tao
22-28
Heating frequency Hz
(09K)
10
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
3rd level
Tao <<10
7th
level
<40 Hz
22
2nd level
3rd level
28
<51 Hz
5th level
3rd level
17
22 < Tao <28
5th level
10 < Tao <17
5th level
40 Hz -55 Hz
3rd level
5 th level
7 th level
51-71 Hz
7th level
4 th level
2nd level
Domestic air conditioner
17
Functions and control
Tao 28
7th level
Tao 17
3rd level
55 Hz
5 th level
7 th level
71 Hz
7th level
5th level