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Siemens RVP201 Manual

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Siemens Heating controllers RVP201 and RVP211 CE1P2464en
Building Technologies 3 Technical design 12.12.2007
3.8 Pump control
The controller controls the heating circuit pump depending on demand. This means that
the pump will be switched on only when there is demand for heat or when frost protec-
tion for the plant has responded.
3.8.1 Pump overrun
To ensure there is no buildup of heat in the boilers (overtemperature protection), heat-
ing circuit pump and charging pump continue to run for a certain period of time after the
switch-off command has been given. The factory-set pump overrun time is 6 minutes.
Depending on the type of plant and the operational status, overrun of the heating circuit
pump and the charging pump acts as follows:
Type of plant Priority Operation Heating circuit
or boiler pump
Charging pump or
changeover valve
D.h.w. heating
only
1
)
Off Overrun
5
)
D.h.w. heating +
Q
H
2
)
Off Æ On
4
) Overrun
5
)
Boiler operation
D.h.w. heating
with charging
pump
Absolute
Q
H
Æ 0
3
) Overrun Off
D.h.w. heating
only
1
)
Overrun
5
) Overrun
5
)
D.h.w. heating +
Q
H
2
)
On Overrun
5
)
Boiler operation
D.h.w. heating
with changeover
valve
–
Q
H
Æ 0
3
) Overrun
5
) –
Absolute or
parallel
D.h.w. heating
only
1
)
Off No Overrun
Absolute D.h.w. heating +
Q
H
2
)
On
6
) No Overrun
Parallel D.h.w. heating +
Q
H
2
)
On No Overrun
Mixing valve
operation
Absolute or
parallel
Q
H
Æ 0
3
) Overrun
5
) Off
Q
H
Heating load
1
) D.h.w. heating only, no space heating (summer operation)
2
) D.h.w. heating and, at the same time, normal heating operation (heating season)
3
) No heating load (Off by ECO)
4
) On completion of d.h.w. heating, the heating circuit pump is immediately activated;
this may lead to a temperature rise in the heating circuit
5
) Protection against discharging active
6
) Mixing valve closes
3.8.2 Pump kick
Periodic pump run is provided to prevent pump seizure during longer off periods (e.g. in
the summer). After the last regular use of the pump, the pump kick is provided for one
minute at 156-hour intervals.
… 27 …


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