Basic Documentation
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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 6 Boiler temperature control 2017-09-29
6.6.12 Protection against pressure shocks
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Limitations
Operating line
Range
Factory setting
Delta boiler temp max (stage 2)
0…10 K
1 K
To prevent pressure shocks in the gas network when stages 1 and 2 are
simultaneously switched off, stage 2 is switched off before the maximum boiler
temperature is reached, the difference being "Delta boiler temp max (stage 2)".
When the boiler is locked, stage 1 is switched off after stage 2, the difference in time
being 10 seconds.
6.7 Flue gas temperature supervision
Flue gas temperature supervision offers:
• Display of the current flue gas temperature
• Display of the maximum flue gas temperature acquired after a selected point in time
• Supervision of the flue gas temperature limit including alarm should the limit value be
exceeded
An appropriate sensor must always be configured, independent of usage.
Main menu > Commissioning > Extra configuration > Boiler > Inputs
Operating line
Adjustable values / display / remarks
Flue gas temperature sensor
Assign input
In contrast to the other temperature inputs, where the default configuration is a Ni1000
sensor, sensor type Pt1000 is used here. The type of sensor can be adapted under
Settings > Inputs at the configured terminal.
Through configuration of the sensor, the following functions are made possible:
This function is active as soon as a flue gas temperature sensor is configured.
Main menu > Boiler > Inputs/setpoints
Operating line
Adjustable values / display / remarks
Flue gas temperature maximum
It is always the maximum flue gas temperature that is saved and displayed. The
displayed value can be adjusted like a setting value (e.g. to 0 °C), whereupon the slave
pointer will start at zero again.
The maximum value is filtered to suppress faults. This means that the maximum flue
gas temperature rises at a maximum rate of 1 K/s.
If a flue gas temperature limit value is parameterized, a fault status message will be
delivered should the limit value be exceeded.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Fault settings > Flue temp supervision
Operating line
Range
Factory setting
Flue gas temperature limit value
---- / 0…400 °C
---- °C
Slave pointer function
Supervision of maximum
value