43
15. Outdoor Unit Control
Mode
Energy-saving mode
Effect priority mode
Outdoor ambient
temperature
Target average TC2
R
R
Tao≤12°C
Target average TC2
9
8
12°C<Tao<40°C
Target average TC2
Set value+2
Set value +2
Tao≥40°C
15.1 Compressor startup control
15.2 Outdoor fan motor control
On startup, inverter compressor will keep for 3 min at 45rps (when Ta<43°C) or 3 min at 40rps (when Ta>=43°C). in
cooling mode, meet running 3min and Td≥85°C(or max. running time is 5min),quite the startup control;
in heating mode, meet running 3min and Ts-Tc≥5°C(or Tc or Ts<-18°C, or max. running time is 5min), quite the
startup control;
During startup, the high pressure, high exhaust protection and current protection is priority and the low exhaust up
frequency protection is shielded.
After startup control, system according to the TC2 value Thermo ON indoor liquid pipe temperature as the target to
control the compressor frequency.
15.1.1 In cooling, the compressor frequency control as below:
Revalue set Tao<-5°C, Target average TC2:0°C; -5°C≤Tao<12°C, Target average TC2 is the set value ( when
12°C<Tao<40°C) and slope value of 0.
15.1.2 In heating, the compressor frequency control as below:
Mode
Energy-saving mode
Effect priority mode
Outdoor ambient
temperature
Target average TC2
Set
value+2
Tao≥15°C
Target average TC2
42
45
Tao≥-5°C
Target average TC2
Set
value+2
Tao<-5°C
In order to improve the effect of indoor unit, reach the purpose of rapid cooling/heating, make the following control:
1) In cooling, when outdoor ambient temperature above 25 °C, the first 60 min, TC2 drops 1°C, returned to normal
after 60 min;
2) In heating, when outdoor ambient temperature below 15 °C, the first 60 min, TC2 rise 1°C, returned to normal
after 60 min;
15.2.1 In cooling mode
15.2.2 In heating mode
According to outdoor temperature of Tc to control the outdoor unit , Tc refers to the higher value of Te and Tc.
when Tc < 10 °C, the fan will stop after running in the low speed for 1 minutes; when 10 °C≤ Tc < 25 °C, fan
reduce the speed per 1 class /45s drop 1 class speed; when 25°C≤Tc<35°C, fan keeps the current speed;
when35°C≤Tc<53°C, fan rise the speed per 1 class /45 s rise 1 class speed; when Tc≥53°C, fan will running with
the highest speed.
During the four-way valve revering, the fan motor stop. Four-way valve has the reversing, after the compressor
start, in 1 minutes the wind speed based on ambient temperature (including defrosting control and the end of the
heating oil return air discharge operation stages), according to the Te temperature automatic control after 1 minute,
Te refers to the higher value of Te and Tc.
When Te> 21°C, Fan reduce the speed per 1 class /45 s until to stop; when 16°C<Te≤21°C, Fan reduce the speed
per 1 class /45 s to drop 1 class ; when 6°C<Te≤16°C, fan keeps the current speed; when 1°C<Te≤6°C, fan rise the
speed per 1 class /45 s rise 1 class speed; when Te≤1°C, fan will running with the highest speed.
