Boiler Temperature Control - Siemens RVP201.0 Manual

Flow temperature
control
Boiler temperature
control
D.h.w. heating
Frost protection for
the plant
4/12
Siemens
Building Technologies
Weather-compensated control with room temperature influence: the setpoint of the
flow or boiler temperature is continuously shifted in function of the outside tempera-
ture (via the outside sensor) and, in addition, in function of the setpoint / actual value
deviation of the room temperature
Room temperature authority is adjustable (range 0...100 %); guide value is 50 %
Room temperature-compensated control: the setpoint of the flow or boiler tempera-
ture is continuously shifted in function of the setpoint / actual value deviation of the
room temperature
With both types of weather-compensated control, the composite outside temperature is
used as the compensating variable. It is generated from the actual and the attenuated
outside temperature. Compared to the actual outside temperature it is attenuated and
delayed.
Three-position control: the flow temperature is controlled continuously with no offset
via a seat or slipper valve driven by an electric or electro-hydraulic actuator
Two-position control: the flow temperature is controlled via a seat or slipper valve
driven by an electro-thermal actuator. The switching differential is 1 K
Maximum limitation of the flow temperature can be provided in the range 10...100 °C.
This function can be deactivated.
The boiler temperature is controlled by a single-stage burner which is switched on and
off. The burner's minimum on time is four minutes. The switching differential is adjusta-
ble in the range 1...20 K.
Maximum limitation of the boiler temperature can be provided in the range 10...100 °C.
This function can be deactivated.
If the boiler temperature falls below 5 °C, the burner will be switched on to maintain a
minimum boiler temperature.
When there is no demand for heat and during quick setback, the boiler will be switched off.
In the case of flow temperature control with a mixing valve, d.h.w. heating is ensured
with a charging pump
With boiler temperature control, the d.h.w. is heated either with a charging pump or
changeover valve
In the case of a charging pump, priority selection can be:
Absolute priority: during d.h.w. heating, the heating circuit pump is locked
No priority (parallel): heating circuit pump and d.h.w. charging pump operate at the
same time
With underfloor heating systems and boiler operations, absolute priority must always be set.
The temperature is measured with an immersion sensor LG-Ni 1000. If the sensor ac-
quires a d.h.w. temperature below the setpoint, the charging pump or changeover valve
will be activated. The excess flow temperature during charging is 16 K (fixed value)
above the adjusted d.h.w. temperature setpoint.
The d.h.w. storage tank is protected against frost. If there is risk of frost, the d.h.w.
temperature will not be allowed to fall below 5 °C.
The d.h.w. temperature can also be acquired by a thermostat. Charging takes place
when the thermostat's contact closes. There is no protection against frost.
Note: a relay controlled by the thermostat (low voltage!) must be connected to terminals
B3–M.
The heating circuit pump is activated to prevent freeze-ups in the plant. Frost protection
can be provided with or without an outside sensor:
With outside sensor:
Outside temperature 1.5 °C: the heating circuit pump will be switched on for 10
minutes at 6-hour intervals
Outside temperature –5 °C: the heating circuit pump runs continuously
Without outside sensor:
Heating Controller RVP201, RVP211 CE1N2464en
2017-07-31