Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 6 Boiler temperature control 2017-09-29
Normally, the shutoff valve is fully open when the boiler is released. In the case of the
maintained boiler return temperature where the boiler is always kept at the minimum
temperature, the behavior of the shutoff valve can be parameterized.
When Open is selected for the shutoff valve (maintained boiler temperature), the valve
will always be opened when the burner runs, even if there is no heat request.
Depending on the type of hydraulic system, this may not be required (e.g. bypass
pump).
DC 0…10 V output for a DC 0…10 V mixing valve actuator.
For more detailed information, refer to subsection 6.6.11 "Maximum limitation of the
boiler temperature".
6.3 Boiler operating modes and boiler setpoints
Main menu > Boiler > Boiler operating mode
Operating line Range Factory setting
Preselection
Auto /
Release DHW / Off
Auto
Setp preselection manual
---- / 8…140 °C
----
State
On / Off
Cause
Commissioning / Frost protection for consumer /
Overtemp protection/overrun /
Frost protection for boiler /
Operating mode selector /
Prot boil startup Boiler / Release delay burner /
Outside temperature lock / Minimum limitation
boiler / Test mode / Flue gas measuring mode /
Request / No request
The user can switch the boiler off via operation.
In operating mode "Release DHW", only heat requests from DHW (digital input or via
KNX bus) will be taken into consideration.
If "Off" is preselected, the internal frost protection function remains active. Heat
requests from an external consumer resulting from frost protection will also be
considered.
This setting can be used to preselect a minimum request for the boiler controller, which
means that a maximum selection based on the consumers' requests will be maintained.
The boiler’s state is indicated (On / Off).
It is indicated why the current state is active.
The boiler temperature setpoint will be generated based on the temperature requests
received from the consumers plus the setpoint increase.
The boiler temperature setpoint and the actual boiler temperature can be called up on
the info level.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Operation settings
Operating line
Range
Factory setting
Setpoint increase
0…50 K
0 K
Control of the shutoff
valve
Maintained boiler return
temperature, continuously
Plant operation selector
Preselection
Manual preselection
of setpoint
State
Cause
Boiler temperature
setpoints