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Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
14 Function block: D.h.w.
2017-07-24
14.6.5 No priority
No priority means parallel operation. D.h.w. charging has no impact on the heating
circuits.
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 type 4 - x, the temperature setpoint for the common flow is forwarded
to the precontroller via data bus.
With plant types 5 - x and 6 - 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 relay
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:
Example
Example