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Siemens Building Technologies CE1N2252E / 14.01.1999
Landis & Staefa Division 5/8
OPTIMUM P.1
OFF
1h / °C
1/2h / °C
1/4h / °C
123
2252Z01
P.1
Optimisation brings forward the switch-on point P.1 such that the selected set point 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 optimisa-
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
2252D01
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
16...29°C
3...29°C
123
2252Z02
COOLING
HEATING
PUMP ON
PUMP OFF
When using minimum limitation of set point to 16 °C, undesired heat transfer to neigh-
bouring flats is prevented in buildings that have several heating zones. The function can
be selected with DIP switch 2.
DIP switch 2 is used for switching over to cooling mode when used in cooling applica-
tions.
The setting is made with DIP switch 2 while the pump is running. Protects the pump
against seizure during longer OFF periods. The periodic pump run is activated for one
minute every 24 hours at 12:00 h.
Technical features
DIP switch 1
Optimum start control
DIP switch 2
Limitation of set point
Cooling
Periodic pump run
(pump kick)
5


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