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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 14 Function block: D.h.w. 15.03.2011
14.11 Setpoint for legionella function
Operating line 130 can be used to adjust the setpoint for the legionella function or
to deactivate the function (setting ---).
For a description of the legionella function and related settings, refer to chapter 16
"Function block: Legionella function".
14.12 Forced charging
Operating line 131 can be used to select whether or not forced charging of the
storage tank shall take place every day when d.h.w. heating is released for the first
time.
With forced charging, the storage tank is also charged when the d.h.w. temperature
lies between the switch-on and switch-off temperature. The switch-off point
remains the same.
If d.h.w. heating is released for 24 hours a day, forced charging takes place very
day at midnight.
14.13 Protection against discharging
14.13.1 Purpose
With plant types that use a d.h.w. storage tank, protection against discharging is
ensured during overrun of the d.h.w. charging pump.
This function makes certain that the d.h.w. does not cool down during the time
pump overrun is performed.
14.13.2 Mode of operation
If the flow temperature lies below the storage tank temperature, pump overrun is
ended prematurely.
The flow temperature is acquired with sensor B2 or obtained via data bus (LPB)
as the common flow temperature, depending on the type of plant.
If the flow temperature lies below the d.h.w. temperature setpoint, pump overrun
is ended prematurely.
The flow temperature is acquired with sensor B2 or obtained via data bus (LPB)
as the common flow temperature, depending on the type of plant.
The flow temperature is ascertained as follows, depending on the type of plant and
the bus connection:
Plant type Controller without bus
connection (LPB)
Controller with bus
connection (LPB)
1–1 Since no flow temperature is
available, there is no pump
overrun due to protection
against discharging
Common flow temperature of the
same segment via data bus.*
Otherwise, there is no pump over-
run due to protection against dis-
charging
3–1 Sensor B2 Sensor B2
* Not possible with RVP351 (no LPB)
With storage tank
sensor
With thermostat
Flow temperature
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