Compressor Pi Control - Daikin E-Series Service Manual

Basic Control
2.2

Compressor PI Control

Compressor PI Control

Carries out the compressor capacity PI control to maintain Te at constant during cooling
operation and Tc at constant during heating operation to ensure stable unit performance.
[Cooling operation]
Controls compressor capacity to adjust Te to
achieve target value (TeS).
TeS initial value
Te changes corresponding to the capacity which indoor units require the above as the initial
value. (However -7
[Heating operation]
Controls compressor capacity to adjust Tc to
achieve target value (TcS).
TcS initial value
Tc changes corresponding to the capacity which indoor units require the above as the initial
value. (However 42
RMXS112 · 140 · 160E
STn INV(Fullload) INV(Unload)
1
2
3
4
5
6 52.0Hz
7 57.0Hz
8 62.0Hz
9 68.0Hz
10 74.0Hz
∗ 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=SVUL). The full load operation is performed with the SVUL set to OFF, while the unload operation is
performed with the SVUL set to ON.
62
M (Normal)
Condition L
(factory setting)
ΔD up
3
ΔD keep
12 12
ΔD down
12 12
≤ ≤
Te 15)
L M (Normal) H
(factory
setting)
43 46 49
≤ ≤
Tc 51)
STn INV(Fullload) INV(Unload)
36.0Hz 11
39.0Hz 12
43.0Hz 13
47.0Hz 14
52.0Hz 15
57.0Hz 16
64.0Hz 17
71.0Hz 18
78.0Hz 19
20
Te : Low pressure equivalent saturation
temperature (°C)
TeS : Target Te value
(Varies depending on Te setting, operating
H frequency, etc.)
6 9
12
13
Tc : High pressure equivalent saturation
temperature (°C)
TcS : Target Tc value
(Varies depending on Tc setting, operating
frequency, etc.)
80.0Hz
86.0Hz
92.0Hz
98.0Hz
104.0Hz
110.0Hz
116.0Hz
122.0Hz
128.0Hz
134.0Hz
SiENBE18-621
STn INV(Fullload) INV(Unload)
21 140.0Hz
22 146.0Hz
23 152.0Hz
24 158.0Hz
25 164.0Hz
26 170.0Hz
27 175.0Hz
28 180.0Hz
29 185.0Hz
30 190.0Hz
31 195.0Hz
Function