T
d
Ts
Tao
Tc
Te
TmC
TinC
TaiC
Toci
TouC
TinB
TmB
TaiB
TouB
TinA
TmA
TaiA
TouA
HPSW
L
P
S
W
3.2 Outdoor frequency control
3.2.1 Compressor running frequency range: 20~90RPS
3.2.2 Defination of high-efficiency operation and its frequency control
In order to meet the cooling request at high ambient temperature and the heating request at low ambient
temperature, we set the high-efficiency operation.
Entering condition: cooling mode, Tao≥33℃(E), heating mode, Tao≤5℃(E).
3.3 Electronic expansion valve (EEV) control
3.3.1 Electronic characteristic
Max. open angle 500 pulse
Driving speed PPS
3.3.2 Initialization of EEV
EEV driving speed: open direction: 32MS; close direction: 32MS
3.3.3 Open angle limitation of EEV
Unit stop Adjustable upper
limitation
Thermostat ON Thermostat
OFF
Adjustable lower
limitation
Cool/dry
5（E） 450（E）
standard open
angle+tolerance
5（E） 80（E）
heat
60（E） 450（E）
standard open
angle+tolerance
60（E） 80（E）
3.3.4 Standard open angle control
In Cool/Dry mode, standard open angle: outdoor ambient temp.≥20℃, 250 pulse(E);
Outdoor ambient temp.＜20℃, 210 pulse(E);
In Heat mode, standard open angle: outdoor ambient temp.≥10℃, pulse (E);
outdoor ambient temp.＜10℃, 210 pulse (E).
3.3.5 When discharging temp. Td is too high, modify the EEV angle.
In order to cooperate the compressor discharging temp. over high protection, the system will enlarge the
EEV open angle. Within 5 minutes after compressor starts up, it will not modify. The detecting period is 30
seconds.
Cooling mode Indoor modification angle
100℃<discharging temp.
+50degree/30seconds, it will stop until up to the max. permitted
opening angle
90℃< discharging temp.<=100℃
Keep the angle
-48-
Commercial Air Conditioner Model: AU18/222XFERA
AS072/092/122XVERA
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