Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 6 Boiler temperature control 2017-09-29
6.2.2 Boiler hydraulics
3133S71
BoPu
TBo
TRtBo
3133S72
TBo
ByPu
TRtBo
TBo
Boiler temperature sensor
TRtBo
Return temperature sensor
(optional, for minimum
limitation)
BoPu
Boiler pump
ByPu
Bypass pump
Boiler pump in the flow
Boiler pump in the bypass
For plant types with boiler (H3-x and H4-x), a boiler pump is always configured. This
boiler pump can also be operated parallel to the boiler, or it can be configured as a
boiler bypass pump.
When using the pump as a boiler bypass pump, the configuration must be made on the
"Extra configuration" menu.
3133S73
MnPu
TBo
TRtBo
BoPu
VlvRtMx
Y2
TBo
Boiler temperature sensor
TRtBo
Boiler return temperature sensor
BoPu
Boiler pump
MnPu
Main pump
VlvRtMx
Maintained return temperature mixing valve
Y2 Balancing valve
With plant types H4-x, the maintained boiler return temperature with 3-position mixing
valve is already configured.
Configuration of a terminal pair for a 3-position mixing valve is required. The terminals
available for selection are the free terminal pairs (Q1/Q2, Q3/Q4) for the on and the off
signal. For that purpose, the special terminal pairs with RC radio interference
suppression must be used.
For more detailed information, refer to subsection 3.2.2 "Terminal assignment and
properties of outputs".
If, in addition, a main pump shall be configured, this must be done on the "Main
controller" block.
Optionally, a twin pump can be used in place of the boiler pump. In that case, in
addition to boiler pump A, an output must also be assigned to boiler pump B via "Extra
configuration".
The single pump or twin pump can be monitored with a fault input and / or a flow
switch.
For more detailed information, refer to section 5.8 "Pump control and twin pumps".
Boiler pump B as a boiler twin pump
T
3132S66
T
T
3132S67
T
3132S68
T
Plant types H3-x
Pump function
Plant types H4-x
Maintained boiler return
temperature with 3
-
position control
Main pump
Twin pump
Boiler pump B
Shutoff valve