9.3.7 Settings
Path: … > SET
Controller 2, basic type
A; controllers 1+2,
basic type U
Display Name Range Factory setting
SET MAX Economy
setpoint high
Main controlled
variable input range
28 °C, 80 %, 100, 1000
SET MAX Comfort setpoint
high
Main controlled
variable input range
24 °C, 60 %, 60, 600
SET MAX Comfort setpoint
low
Main controlled
variable input range
21 °C, 40 %, 0, 0
SET MAX Economy
setpoint low
Main controlled
variable input range
19 °C, 20 %, 0, 0
9.3.8 Application examples
The universal controller is able to control to an absolute variable or differential
variable. In the case of differential control, the variable to be controlled is the
following:
Main controlled variable (MAIN) minus variable at the differential input (DIFF)
Typical application examples of both control strategies:
• Basic heating plant, outside temperature-dependent flow temperature control
(without room influence), thermostatic radiator valves
• Differential pressure control
The chilled ceiling's flow temperature is controlled to an absolute value:
Example of chilled ceiling
(absolute variable)
DO
Q1
M
AO
AI
T
Y
X1
Y
SIGNAL Y
LABEL
TEMP
yp yp yp
x
xx
DIFF
x
Q
MAIN
LIM SEQLIM
SHIFT
1
CTLOOP 1
DV ALM
SEQ2 Y
SEQ2 P
SEQ1 Y
SEQ1 P
SEQ4 Y
SEQ4 P
SEQ5 Y
SEQ5 P
p2
PUMP 1
PUMP 1
1
y2
IN X
x
A0
AO 1
3101S25
107 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
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