Siemens Building Technologies
Basic Documentation REA22
Issue 2.0
CE1P2276E / 31.03.1999
Landis & Stefa Division
Description of heating engineer settings
21/30
4
Description of heating engineer settings
ON
1 2 3 4
ON
1 2 3
22
76
Z
2
7
ON
1 2 3
3
2
4
1
1
DIP switch 1 for optimum start control
2
DIP switch 2 for limitation of setpoints,
cooling function and periodic pump run
(pump kick)
3
DIP switch 3 for PID control and frost pro-
tection
4
Reset button for confirmation of changed
settings
4.1
DIP switch 1
OPTIMUM P.1
OFF
1h / °C
1/2h / °C
1/4h / °C
1
2
3
22
76
Z
0
1
P.1
The factory setting of all DIP switches is OFF.
If one or several DIP switch positions are changed, the reset button must be pressed as
a confirmation. Otherwise the previous settings are still active!
4.1.1 Optimum start control
Optimization brings forward the switch-on point P.1 such that the selected setpoint will
be reached at the desired time. The setting depends on the type of control system in
use, that is, on heat transmission (piping system, radiators), building dynamics (building
mass, insulation), and heating output (boiler capacity, flow temperature). The optimiza-
tion is set with DIP switch 1 as follows:
OFF
No effect
1/4h/°C
For fast controlled systems
1/2h/°C
For medium controlled systems
1h/°C
For slow controlled systems
t
T
17
18
19
- 4
- 2
22
7
6
D
0
1
16
- 3
1/4h/°C
1/2h/°C
1h/°C
P.1
- 2
- 1
- ½
- 1½
- 1
- ½
- ¼
- ¾
P
on
20
°C
T1
- 1 h
h
h
TR
x
h
h
h
h
h
h
h
h
h
T
Temperature (°C)
TR
x
Actual value of room temperature
t
Forward shift of switch-on point (h)
P
on
Starting point for optimum on
Note
