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