Pump Kick; Protection Against Discharging After D.h.w. Heating - Siemens RVA47.320 User Manual

Benefit
Description
Process
Effect
Note
Benefit
Description
Process
Siemens Building Technologies
HVAC Products
7.6

Pump kick

•
No seizing of pumps
The pump kick is a protective function aimed at preventing the pumps from seizing.
Every Friday at 10:00 h, the pumps connected directly to the RVA47.320 are activated
for 30 seconds, one by one at an interval of one minute.
The pump kick is activated without giving consideration to any of the other functions.
During the periods of time pump kick is activated, the water circulates. The mechanical
parts of the pumps will be purged, thus preventing the pumps from seizing.
The kick of the d.h.w. pump is the last pump kick made in order to prevent the transfer
of heat from the d.h.w. storage tank to the heating system.
7.7 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 44
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 RVA47.320
Functions with no settings
), efficient
OEM
141/166
CE1P2379E
15.07.2002