Airwell YEVFD Series, Service Manual

Page: 55 / 92

16. Outdoor Unit Control
Mode
Effect priority mode
(default)
Energy-saving mode
Outdoor ambient
temperature
Ps correction
during running
Target Ps Setting value -R°C Setting value -R°C Ta≤12°C
During running:
correct the Ps
according to the
compression ratio
Target Ps (set by dip
switch)
0 2 12°C<Ta<40°C
Target Ps Setting value +2°C Setting value +2°C Ta≥40°C
16.1 Compressor startup control
After receiving the outdoor startup instruction, outdoor open SV1 30 seconds and then standby. When startup, the
compressor will keep for 3 min at 45rps (when Ta<40°C) or 3 min at 40rps (when Ta>=40°C). In cooling mode, meet
running 1min & (Td-CT)≥20°C or Ps≤0.1MPa (or max. running time is 3min),quite the startup control;
In heating mode, meet running 1min and & (Td-CT)≥20°C or Ps≤0.1MPa (or max. running time is 3min), quite the
startup control;
During startup, the high pressure protection, high exhaust protection and current protection is priority and the low
exhaust up frequency protection is shielded.
16.2 Compressor output control
Compressor Pd/Ps control, control the compressor frequency to output appropriate cooling/heating capacity.
The control at the end of the startup control.
16.2.1
In cooling mode:
According to the ambient temperature select target Ps automatically
R value setting: Ta<-5°C, Target Ps: setting value -8°C
-5°C≤Ta<12°C, Target Ps is the slope value of setting value and (setting value -8°C)
16.2.2 In heating mode:
According to the piping length to select target Pd and also according to the ambient temperature select target Pd
automatically
Mode
Effect priority mode
(default)
Energy-saving mode
Outdoor ambient
temperature
Pd correction during
running
Target Pd Setting value +3°C Setting value +3°C Ta≥15°C
During running:
correct the Pd
according to the
compression ratio
Target Pd Setting value +2°C Setting value +2°C Ta≥7°C
Target Pd
(set by dip switch)
48 46 Ta≥-5°C
Target Pd Setting value -2°C Setting value -2°C Ta<-5°C
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