SiBE18-821_C Basic Control
Function 79
2.2 Compressor PI Control
The PI control of compressor capacity is carried out to maintain Te at constant during cooling
operation and Tc at constant during heating operation to ensure stable unit performance.
[Cooling operation]
[Heating operation]
∗
Compressors may operate in a pattern other than those listed in above tables subject to the
operating conditions. Selection of full load operation to/from unload operation is made with
the unload circuit solenoid valve (Y3S). The full load operation is performed with the Y3S set
to OFF, while the unload operation is performed with the Y3S set to ON.
Controls compressor capacity to adjust Te to
achieve target value (TeS).
Te : Low pressure equivalent saturation temperature
(°C)
Te setting (Set in Set-up mode 2) TeS : Target Te value
(Varies depending on Te setting, operating
frequency, etc.)
LM (Normal)
(factory
setting)
H
369
Controls compressor capacity to adjust Tc to
achieve target value (TcS).
Tc : High pressure equivalent saturation temperature
(°C)
Tc setting TcS : Target Tc value
(Varies depending on Tc setting, operating
frequency, etc.)
LM (Normal)
(factory
setting)
H
43 46 49
Step Full-load Unload Step Full-load Unload
1 36.0 Hz 16 110.0 Hz
2 39.0 Hz 17 116.0 Hz
3 43.0 Hz 18 122.0 Hz
4 47.0 Hz 19 128.0 Hz
5 52.0 Hz 20 134.0 Hz
6 52.0 Hz 57.0 Hz 21 140.0 Hz
7 57.0 Hz 64.0 Hz 22 146.0 Hz
8 62.0 Hz 71.0 Hz 23 152.0 Hz
9 68.0 Hz 78.0 Hz 24 158.0 Hz
10 74.0 Hz 25 164.0 Hz
11 80.0 Hz 26 170.0 Hz
12 86.0 Hz 27 175.0 Hz
13 92.0 Hz 28 180.0 Hz
14 98.0 Hz 29 185.0 Hz
15 104.0 Hz 30 190.0 Hz
31 195.0 Hz
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