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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 14 Function block: D.h.w. 15.03.2011
14.6.6 Flow temperature setpoint
With "Shifting priority" and "No priority", the temperature setpoint for the common
flow, which is used for d.h.w. charging and space heating, can be generated in 2
different ways:
Flow temperature setpoint according to maximum selection
Flow temperature setpoint according to d.h.w. request
With plant types 1 - x and 2 - x, the temperature setpoint for the common flow is
forwarded to the precontroller via data bus.
With plant type 3 - x, the temperature setpoint for the common flow is valid for
sensor B2.
14.6.7 Maximum selection
With d.h.w. heating, the temperature setpoint for the common flow – which is used
for both the d.h.w. and the heating circuit – is generated via maximum selection,
based on the 2 heat requests.
The mixing heating circuit calls for 40 °C, the d.h.w. circuit for 65 °C. With d.h.w.
charging, the setpoint for the common flow temperature will then be the higher of
the 2, namely 65 °C.
14.6.8 D.h.w.
With d.h.w. heating, the temperature setpoint for the common flow used for d.h.w.
and the heating circuit will then be that demanded by the d.h.w. circuit.
The mixing heating circuit calls for 80 °C, the d.h.w. circuit for 65 °C. With d.h.w.
heating, the temperature setpoint for the common flow will then be that demanded
by the d.h.w. circuit, namely 65 °C.
14.7 Type of d.h.w. charging
Refer to chapter 15 "Function block: Multifunctional relays".
14.8 D.h.w. storage tank sensor/thermostat
The way the d.h.w. storage tank temperature is acquired must be selected on op-
erating line 126. It can be captured with 1 or 2 sensors, or with 1 or 2 thermostats.
In the case of plants without solar d.h.w. heating, settings 0 to 3 are available; with
solar d.h.w. heating, setting 4 or 5:
Setting Type of charging
0 D.h.w. charging with 1 sensor
1 D.h.w. charging with 2 sensors
2 D.h.w. charging with 1 thermostat
3 D.h.w. charging with 2 thermostats
4 Solar d.h.w. charging with 1 sensor *
5 Solar d.h.w. charging with 2 sensors *
* The settings for solar d.h.w. charging are to be made on operating lines 201 - 208
Example
Example
60


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