Daikin Super Multi Plus D-Series, Service Manual

Page: 67 / 395

Basic Control SiEBE18-526
56 Function
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]
Te changes corresponding to the capacity which indoor units require the above as the initial
value. (However -7
≤
Te
≤
15)
[Heating operation]
Tc changes corresponding to the capacity which indoor units require the above as the initial
value. (However 42
≤
Tc
≤
51)
Controls compressor capacity to adjust Te to
achieve target value (TeS). Te : Low pressure equivalent saturation
temperature (°C)
TeS initial value TeS : Target Te value
(Varies depending on Te setting, operating
frequency, etc.)
Condition L
M (Normal)
(factory setting)
H
∆
D up 3 6 9
∆
D keep 12 12 12
∆
D down 12 12 13
Controls compressor capacity to adjust Tc to
achieve target value (TcS). Tc : High pressure equivalent saturation
temperature (°C)
TcS initial value TcS : Target Tc value
(Varies depending on Tc setting, operating
frequency, etc.)
L M (Normal)
(factory
setting)
H
43 46 49
RMXS112 · 140 · 160D
STEP INV
1 52Hz
2 57Hz
3 62Hz
4 68Hz
5 74Hz
6 80Hz
7 86Hz
8 92Hz
9 98Hz
10 104Hz
11 111Hz
12 118Hz
13 124Hz
14 129Hz
15 134Hz
STEP INV
16 140Hz
17 146Hz
18 152Hz
19 158Hz
20 164Hz
21 170Hz
22 175Hz
23 180Hz
24 185Hz
25 190Hz
∗
Compressors may operate in a pattern other than those listed in above tables subject to the operating conditions.