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Siemens Building Technologies Basic Documentation RVA53.242, RVA53.242 CE1P2373E
Landis & Staefa Division General control processes 26.03.2001
6.9 D.h.w. push
Availability of d.h.w. is also ensured during non-occupancy times.
If, due to unexpected demand, the d.h.w. storage tank is emptied, the d.h.w. push
provides one-time charging of the storage tank until the nominal d.h.w. temperature
setpoint is reached.
The d.h.w. push is triggered as soon as the actual d.h.w. temperature falls below the
reduced d.h.w. setpoint (line 51OEM ) by an amount that exceeds twice the switching
differential (line 120).
TBWx < TBWR - 2 SDB
When the d.h.w. push is triggered, the storage tank is charged once until the nominal
d.h.w. temperature setpoint (line 120) is reached.
Then, normal operation according to the d.h.w. heating program is resumed.
t
2371D10
TBWw
TBWR
TBWw
TBWR
2
·
SDBW
SDBW
SDBW
Push
TBWx
t
SDBW Switching differential d.h.w.
TBWw Nominal setpoint of the d.h.w. temperature
TBWR Reduced setpoint of the d.h.w. temperature
Benefit
Description
Process
Effect
Example
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