Pump And Valve Kick; Protection Against Discharging After D.h.w. Heating - Siemens RVA63.242 User Manual

Benefit
Description
Process
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Siemens Building Technologies
Landis & Staefa Division

6.10 Pump and valve kick

No seizing of pumps and valves.
The pump and valve kick is a protective function aimed at preventing the pumps and
valves from seizing.
The connected pumps and valves will be activated for 30 seconds every Friday
morning at 10:00 h, on by one, at 30 second intervals. Non-existing devices will be
skipped so that the order of activation may vary.
The pump kick is activated without giving consideration to any of the other functions.
The valve kick is activated only when there is no demand for heat.
During the periods of time pump and valve kick are activated, the water circulates. The
mechanical parts of the pumps and the valve seats will be purged, thus preventing the
pumps and valves from seizing.
The electric immersion heater (K6/K7) is not affected by this function!
6.11 Protection against discharging after d.h.w.
heating
Inadvertent discharging of the d.h.w. storage tank will be prevented.
The "Protection against discharging after d.h.w. heating" prevents inadvertent
discharging of the d.h.w. storage tank resulting from the pump overrun. Together with
"Protection against discharging during d.h.w. heating" (operating line 54
protection against discharging is thus ensured.
The controller compares the storage tank temperature with the cascade flow
temperature (common flow temperature) or, in certain situations, with the boiler
temperature.
If the cascade temperature (or the boiler temperature) is lower than the storage tank
temperature, pump overrun will be stopped prematurely.
Basic Documentation RVA63.242, RVA53.242
General control processes
), efficient
OEM
CE1P2373E
26.03.2001