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Siemens Heating controllers RVP201 and RVP211 CE1P2464en
Building Technologies 3 Technical design 12.12.2007
D.h.w. heating is always enabled; there are no locking times.
In manual operation, d.h.w. heating is switched on; the charging pump is enabled.
With d.h.w. heating (charging pump or changeover valve), the switching differential lies
asymmetrically below the setpoint:
t
2462D03
x
T
BW
w
SD = 5 K
ON
OFF
SD Switching differential
t Time
T
BW
D.h.w. temperature
w Setpoint of d.h.w. temperature
x Actual value of d.h.w. temperature
If, in the case of boiler operation, the boiler temperature during the pump overrun time
lies below the d.h.w. temperature, pump overrun will be stopped prematurely (that is,
before the 6 minutes have elapsed). This prevents the d.h.w. from cooling down un-
necessarily.
When using a thermostat for the d.h.w. temperature, pump overrun will be stopped
when the boiler temperature lies below the adjusted d.h.w. temperature setpoint.
3.7.4 D.h.w. heating with changeover valve
If the sensor acquires a d.h.w. temperature that lies 5 K below the d.h.w. temperature
setpoint (or if the contact of the d.h.w. thermostat closes), the changeover valve will be
activated. During d.h.w. heating, the flow temperature is raised to a level that is 16 K
(fixed value) higher than the adjusted setpoint of the d.h.w. temperature. When the
d.h.w. temperature reaches the setpoint, the changeover valve will be shut down again.
D.h.w. heating is always enabled; there are no locking times.
In manual operation, d.h.w. heating is switched off; the changeover valve travels to the
position "Heating circuit" (space heating).
If, in the case of boiler operation, the boiler temperature during the pump overrun time
lies below the d.h.w. temperature, pump overrun will be stopped prematurely (that is,
before the 6 minutes have elapsed). This prevents the d.h.w. from cooling down un-
necessarily.
When using a thermostat for the d.h.w. temperature, pump overrun will be stopped
when the boiler temperature lies below the adjusted d.h.w. temperature setpoint.
3.7.5 Frost protection
The d.h.w. storage tank is protected against frost, provided a d.h.w. temperature sensor
is used.
Frost protection is automatically activated if the d.h.w. temperature falls below 5 °C.
The charging pump or the changeover valve will be activated and a d.h.w. temperature
of at least 5 °C is maintained.
When using a thermostat, the RVP211 does not provide frost protection for the d.h.w.
storage tank.
Switching differential
Protection against
discharging
Heating
Protection against
discharging
Caution!
26


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