Functions and control
17 Domestic air conditioner
When refrigerating, it is needed to satisfy
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˄ć˅ Tao <22ć 22ć< Tao <28ć Taoı29ć
Refrigeration/dehumidification
(18K/24K)
2ndlevel /2ndlevel 3rdlevel /4thlevel 5thlevel /6thlevel
Tao˄ć˅ Tao <<10ć 10ć< Tao <17ć Tao ı17ć
Heating 5th level /6thlevel 3th level /5thlevel 3rdlevel /2ndlevel
After 3 minutes, the compressor is controled according to the ambient temperature and the frequency of the
compressor.
Refrigeration/dehumidification
frequency˄Hz˅18K˄24K)
<40 Hz 40 Hz-60 Hz
ı60 Hz
Tao˄ć˅
İ22
2nd level 3rd level 5 th level(6 th)
22-28 3rd level 5 th level 7 th level(6 th)
ı28
7 th level
Heating frequency˄Hz˅
(18K/24K)
<51 Hz 51-70 Hz
ı70 Hz
Tao˄ć˅
İ10
5nd level(3rd) 6rd level 7 th level
10-17 3rd level(2nd) 4 th level 5 th level(6 th)
ı17
2nd level
7.1.3 The control of the outdoor Electronic expansion valve (EEV)
In cooling mode, the EEV opening range is 90~480 steps. The EEV opening is 90 steps when unit is
off.
In heating mode, the EEV opening range is 60~480 steps. The EEV opening is 60 steps when unit is
off.
After outdoor unit is off, the EEV opening keep the current on for 5 s, then open the EEV completely for
2 minutes, then become 90 steps (cooling) or 60 steps (heating).
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