Flue Gas Measuring Mode - Siemens Synco700 RMK770 Documentation Handbook

Supervision of the
maximum value
Supervision of the
maximum value and
boiler stop
Diagnostic values
120/226
Building Technologies
HVAC Products
It is always the maximum flue gas temperature that is saved and displayed. On the
menu line that shows the value, the value can be reset to 0 °C, thereby adopting the
current value.
The maximum value is filtered to suppress faults. As a result, the maximum flue gas
temperature rises at the rate of maximum 1 K/s.
If a flue gas temperature limit value is parameterized, a fault status message will be
delivered when the limit value is crossed.
Main menu > Commissioning > Settings > ... or
Main menu Settings > Boiler ... > Fault settings > Flue gas temperature supervision
>
Operating line
Flue gas temperature-limit value
When the flue gas temperature lies 5 K below that maximum flue gas temperature, the
error message can be reset by acknowledging the error message. When resetting, the
slave pointer valve is also reset to the current value.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Boiler ... > Fault settings > Flue gas temperature supervision
Operating line
Impact of fault
Fault priority
If a flue gas temperature limit value is monitored, it is also possible to define if crossing
of the limit value shall cause the boiler to shut down (No stop, Stop).
Main menu > Boiler ... > Inputs/Setpoints
Operating line
Flue gas temperature
Flue gas temperature maximum
The current flue gas temperature and the maximum flue gas temperature are available
as diagnostic values.
7.12

Flue gas measuring mode

Flue gas measurement can be triggered via a digital input ( Inputs > Flue gas measuring
mode ) or operation.
Main menu > Boiler ... > Flue gas measuring mode
and
Operating line
Preselection
Flue gas meas mode contact
Release stage 2/modulation
Actual value boiler temperature
Flue gas temperature
The function will be aborted after 30 minutes.
If the function is activated with one of the boilers, all boilers in the boiler sequence will
be shut down. With the relevant boiler, the boiler pump and the peripheral devices will
be put into operation. The boiler is assigned a boiler temperature setpoint of 90 °C. This
value is limited by the maximum boiler temperature.
During the period of time the "Flue gas measuring mode" function is performed, supervi-
sion of the maximum flue gas temperature does not lead to a plant stop. However, if the
maximum flue gas temperature is exceeded, a fault status message will be delivered.
Boiler Sequence Controller RMK770
7 Boiler temperature control
Range
---- / 0...400 °C
Range
No stop / Stop
Urgent / Not urgent
Adjustable values / remarks
Range
Off / On
0 / 1
Yes / No
Factory setting
---- °C
Factory setting
No stop
Nonurgent
Factory setting
Off
Yes
CE1P3132en
01.03.2005