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Siemens Heating controllers RVP201 and RVP211 CE1P2464en
Building Technologies 3 Technical design 12.12.2007
These three factors are used to generate the corrective variable for the flow tempera-
ture setpoint.
This type of control is used primarily in well insulated buildings or buildings with consid-
erable heat gains where
several rooms are occupied at the same time
a room is suited as a reference room for the room temperature
3.3.7 Control process
If the flow temperature deviates from the setpoint, a two-port seat valve or mixing valve
(three-port seat or slipper valve) driven by an electric actuator is controlled in a step-
wise fashion until the setpoint is reached.
The RVP201/211 is suited to drive electric or electro-hydraulic actuators with a running
time of 2 to 3 minutes, whereby a maximum running time of 6 minutes may not be ex-
ceeded.
If the flow temperature deviates from the setpoint, a two- or three-port seat valve driven
by an electro-thermal actuator is controlled in on / off mode until the setpoint is
reached. The switching differential is constant at 1 K (fixed value).
The RVP201/211 is suited to drive electro-thermal actuators with a running time of 8 to
16 minutes.
Two-position control maintains the required boiler temperature by switching the burner
on and off. The control commands to the burner are delivered via the output relay.
The minimum running time of the burner is 4 minutes (fixed value). The switching dif-
ferential is adjustable in the range 1…20 K.
The controller compares the actual value of the boiler temperature with the setpoint. If
the boiler temperature falls below the setpoint by an amount equal to half the switching
differential, the burner is switched on. If the boiler temperature exceeds the setpoint by
half the switching differential, the burner is switched off again.
If there is no more deviation before the minimum burner running time has elapsed, the
burner will still remain switched on until that time has elapsed (burner cycling protection.
This means that the minimum burner running time has priority. To be considered is the
boiler temperature's maximum limitation however, which always switches the burner off.)
T
Kw
+ 0,5 × SD
0
1
2522D14
T
K
T
Kw
T
Kw
- 0,5 × SD
T
Kx
t
Y
B
SD Switching differential
t Time
T
K
Boiler temperature
w
TK
Boiler temperature setpoint
x
TK
Boiler temperature actual value
Y
B
Burner control signal
Frost protection for the boiler uses fixed values:
Switch-on point: 5 °C boiler temperature (= minimum limit value)
Switch-off point: minimum limit value of boiler temperature + switching differential.
For the switching differential, the value set for control will be adopted
During quick setback or when there is no demand for heat, the boiler will be shut down,
that is, no defined minimum temperature will be maintained.
Three-position flow
temperature control
Two-position flow tem-
perature control
Two-position boiler
temperature control
Frost protection for the
boiler
20


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