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Circulating pump cycling
Circulaton setpoint
Setpoints
Minimum limitation of the return temperature
Return setpoint min
68/109
Siemens
Building Technologies
DHW release
Time program 4 / DHW
1661
Circulating pump cycling
1663
Circulaton setpoint
When the function is activated, the circulating pump is switched on for 10 minutes
within the release time and then switched off again for 20 minutes.
If a sensor is installed in the DHW distribution pipe, the controller will monitor its actual
value during the time the legionella function is performed. The adjusted setpoint must
be maintained at the sensor during the adjusted dwelling time.
6.5 Boiler
Line no.
Operating line
2210
Setpoint min
2212
Setpoint max
The controlled boiler temperature setpoint can be limited by selecting setpoint minimum
and setpoint maximum. These limitations can be regarded as protective functions for
the boiler.
In normal operation, minimum limitation of the boiler temperature is the lower limit value
of the controlled boiler temperature setpoint, depending on the boiler's operating mode.
In normal operation, maximum limitation of the boiler temperature is the upper limit
value of the controlled boiler temperature setpoint and, at the same time, setpoint of the
electronic limit thermostat (TR).
The setting range of setpoint minimum and setpoint maximum is limited by the setpoint
of manual control.
Example when using boiler operating mode "Automatic":
TK
°C
80
TK
w
70
60
50
40
TK
min
30
0
20
10
0
Line no.
Operating line
2270
Return setpoint min
If the boiler return temperature falls below the return temperature setpoint, maintained
boiler return temperature becomes active.
Maintained boiler return temperature makes it possible to impact the consumers via the
following settings:
· "Return influence consumers", using operating line line 2272
· "Control bypass pump", using operating line 2291
User Manual
6 The settings in detail
TK
m ax
-10
-20
°C
TA
gem
Legend
TK
Boiler temp
TKw
Boiler temperature setpoint
...TKmax Maximum limitation:boiler
temperature
TKmin
Minimum limitation of the
boiler temperature
SDK
Switching diff
Tagem
Composite outside
temperature
CE1U2357en
2014-07-30
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