Basic Documentation
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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 10 DHW heating 2017-09-29
TStTa
3133D05
ON
OFF
SDDhw
T
OFF
=
TStTaSetpt
T
ON
T
TStTaTop
An additional storage tank sensor can be configured for storage tank charging control.
The storage tank sensor at the bottom allows better usage of the storage tank volume.
The function is to be activated via "Extra configuration":
… > Inputs > Storage tank sensor bottom Assign terminal
Main menu > Commissioning > Settings > … or
Main menu > Settings > DHW > DHW
Operating line
Range
Factory setting
Setback DHW setpoint bottom
0…20 K
5 K
When using an additional storage tank sensor at the bottom of a stratification storage
tank, it can be ensured that the tank will be fully charged.
In the case of storage tanks with good stratification, consideration can also be given to
the anticipated temperature differential by setting the DHW setpoint drop at the bottom
(TStTa SetptRed).
Storage tank charging is started when both temperatures (TStTaTop and TStTaBot)
drop below their switch-on points (T
on
).
For storage tank charging to end, both temperatures (TStTaTop and TStTaBot) must
exceed their switch-off point (T
OFF
).
3133D06
T
TStTaTop
T
TStTaBot
ON
OFF
SDDhw
TStTaSetpt
+
P
ON
SDDhw
TStTaTop
TStTaBot
ON
OFF
TStTaSetptNorm TStTaSetptRed
P
OFF
P
ON
P
OFF
Type of storage tank = stratification storage tank with 2 storage tank sensors
Storage tank temperature setpoint = 55 °C
Switching differential for storage tank charging = 5 K
Setpoint reduction at the bottom for storage tank charging = 3 K
Storage tank sensor
at the bottom
Extra configuration
Settings
Storage tank sensor
at top and bottom
Starting storage tank
charging
Ending storage tank
charging
Example