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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 14 Function block: D.h.w. 15.03.2011
The switch-on and switch-off temperatures for charging via sensors are calculated
as follows:
T
BWx
2524D02
ON
OFF
SD
BW
T
OFF
= T
BWw
T
ON
ON
D.h.w. charging ON
OFF
D.h.w charging OFF
SD
BW
Switching differential of d.h.w. charging (operating line 128)
T
ON
Switch-on temperature
T
OFF
Switch-off temperature
T
BWw
NORMAL or REDUCED setpoint of d.h.w. temperature (operating line 26 or 28)
T
BWx
D.h.w. temperature (operating line 27)
T
BWx1
Measured value storage tank sensor 1 (B31)
T
BWx2
Measured value storage tank sensor 2 (B32)
Fixing the switch-on temperature (start of d.h.w. charging):
Op. line
126
Acquisition Switching criterion
0 1 sensor T
BWx1
< (T
BWw
– SD
BW
)
1 2 sensors T
BWx1
< (T
BWw
– SD
BW
) and T
BWx2
< (T
BWw
– SD
BW
)
2 1 thermostat Thermostat contact B31 closed
3 2 thermostats Thermostat contacts B31 and B32 closed
4 Solar via 1 sensor T
BWx1
< (T
BWw
– SD
BW
)
5 Solar via 2 sensors T
BWx1
< (T
BWw
– SD
BW
) and T
BWx2
< (T
BWw
– SD
BW
)
Fixing the switch-off temperature (end of d.h.w. charging):
Op. line
126
Acquisition Switching criterion
0 1 sensor T
BWx1
> T
BWw
1 2 sensors T
BWx1
> T
BWw
and T
BWx2
> T
BWw
2 1 thermostat Thermostat contact B31 open
3 2 thermostats Thermostat contacts B31 and B32 open
4 Solar with 1 sensor T
BWx1
> T
BWw
5 Solar with 2 sensors T
BWx1
> T
BWw
and T
BWx2
> T
BWw
From the 2 tables above, it is apparent that when using 2 sensors, it is of no impor-
tance which is fitted at the top and which at the bottom of the storage tank.
If the storage tank is equipped with a thermostat, it is the thermostat that deter-
mines the switch-on/off temperature.
Note
61


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