Compressor Pi Control - Daikin Super Multi Plus D-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 · 160D
STEP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
∗ Compressors may operate in a pattern other than those listed in above tables subject to the operating conditions.
56
M (Normal)
Condition L
(factory setting)
∆D up
3
∆D keep
12 12
∆D down
12 12
≤ ≤
Te 15)
L M (Normal) H
(factory
setting)
43 46 49
≤ ≤
Tc 51)
INV
52Hz
57Hz
62Hz
68Hz
74Hz
80Hz
86Hz
92Hz
98Hz
104Hz
111Hz
118Hz
124Hz
129Hz
134Hz
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.)
STEP
16
17
18
19
20
21
22
23
24
25
SiEBE18-526
INV
140Hz
146Hz
152Hz
158Hz
164Hz
170Hz
175Hz
180Hz
185Hz
190Hz
Function