Siemens RVA53.280 - Switching Differential of D.H.W. Temperature (SDBW)

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Siemens Building Technologies Basic Dokumentation RVA63.280, RVA53.280 CE1P2374E
Landis & Staefa Division 19.04.2001
3.26 Switching differential of d.h.w. temperature
(SDBW)
Optimum frequency of d.h.w. heating.
D.h.w. heating is in the form of 2-position control for which a switching differential must
be set.
The switching differential used for d.h.w. control does not affect d.h.w. heating with a
control thermostat.
Setting range Unit Factory setting
0...20 °C (K) 5
The setting will change the switching differential of the d.h.w. temperature control.
Entry:
Increase: Switching differential will become larger
Fewer and longer heating up times, larger temperature variations
Decrease: Switching differential will become smaller
More frequent and shorter heating up times, smaller temperature
variations
3.26.1 d.h.w. temperature control
2-position control heats the d.h.w. at certain intervals. The duration of the heating up
time is dependent on the mass of the storage tank and the amount of water contained
in the tank. The greater the amount of d.h.w. needed, the longer the heating up time.
OFF
ON
P
°C
TBWx
TBWw
2371D05
TBWw-SDBW
t
Legend
TBWx Actual value of d.h.w.
temperature
TBWw D.h.w temperature setpoint
SDBW Switching differential of d.h.w.
temperature
ON Switch-on point
OFF Switch-off point
D.h.w. ON: TBWx = TBWw - SDBW
D.h.w. OFF: TBWx = TBWw
°C
2371Z24
ON
OFF
w
wSetpoint
51 Switching differential of d.h.w. temperature
Switch-on point
Switch-off point
Benefit
Description
Note
Setting
Effect
Switching differential