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Siemens Heating controllers RVP201 and RVP211 CE1P2464en
Building Technologies 3 Technical design 12.12.2007
If, however, the boiler temperature falls below 5 °C, the burner will always be switched
on until the boiler temperature has exceeded the minimum limit value of the boiler tem-
perature by the amount of the switching differential. This always ensures a minimum
boiler temperature of 5 °C.
3.3.8 Limitations
The maximum limitations are no safety functions! For this purpose, devices such as
thermostats, limit thermostats, etc., are to be used.
Maximum limitation of the flow temperature can be set in the range 10…100 °C.
At the limit value, the heating curve runs horizontal. This means that the flow tempera-
ture setpoint cannot exceed the maximum value.
This function can be disabled.
Maximum limitation of the boiler temperature can be set in the range 10…100 °C.
The burner's switch-off point cannot be higher than the maximum limit value. In that
case, the switch-on point will be lower by the amount of the set switching differential.
This function can be disabled.
For minimum limitation of the boiler temperature, a fixed limit value of 5 °C has been
entered. The switch-on point cannot fall below the minimum limit value. In that case, the
switch-off point will be higher by the amount of the set switching differential (also refer
to "Frost protection for the boiler" in section "3.3.7 Control process").
Q
2462D07
T
K
SD
T
Kmax
T
Kmin
SD
SD
Action of switching differential at
the limit values
Q
H
Heating load
SD Switching differential
T
K
Boiler temperature
T
Kmax
Maximum limit value
T
kmin
Minimum limit value
3.4 Optimization functions
3.4.1 Boost heating
When changing from a lower temperature level (reduced temperature or protection
mode) to the normal temperature, the room temperature setpoint is raised by 5 K, also
leading to an appropriately higher flow temperature setpoint. Also, the selected room
authority is considered when generating this setpoint.
The boost of 5 K is factory-set.
When the room temperature is only 0.25 K below the normal temperature setpoint, the
boost function will be disabled.
Boost heating can be provided only if a room temperature sensor (room unit) is used.
It is active independent of the setting of potentiometer E.
Note
Maximum limitation of
flow temperature
Maximum limitation of
boiler temperature
Minimum limitation of
boiler temperature
21


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