Siemens LMS14 User Manual page 429

Info/diagnostics
Operating state
Building Technologies Division
Since input H2 inside the module acts on the states of the relays, the limit thermostat
continues to be active even if communication with the basic unit is interrupted.
If the Limit thermostat function is not desired, the parameter settings for input H2 must
be appropriately changed.
Line no. Operating line
7846 Contact state H2 module 1
7849 Contact state H2 module 2
7852 Contact state H2 module 3
Signal states: Open/Closed.
The current operating state can be verified on operating page Status.
Start prevention
This input allows you to force the boiler not to start by applying start prevention.
Error 193 Start prevention signal input is generated, transferred via LPB, and saved in
the error history.
Start prevention is only applied to the local boiler.
If start prevention is activated at multiple Hx inputs, it will be applied whenever a start
prevention input is active.
Danger!
Start prevention also locks protection functions such as frost protection!
Make sure that the start prevention function cannot cause any damage.
Boiler flow switch
The contacts of the boiler flow switch make when there is flow, or sufficient flow,
through the boiler's heat exchanger. If the contacts do not close, startup is prevented.
Warning!

If the function is activated simultaneously at several inputs, it automatically
acts on the input with the highest number.
Example:
If the boiler flow switch is activated simultaneously at inputs H1 and H3, it
only becomes active at H3 (no configuration error)

With the BwDl2 instantaneous water heater system, the boiler flow switch
is not checked
Boiler pressure switch
When the contacts of the pressure switch make, burner control startup and control of
the pumps are immediately released. When the contacts break, start prevention or
lockout is triggered.
Warning!
If the function is activated simultaneously at several inputs, it automatically
acts on the input with the highest number.
Example:
If the boiler pressure switch is activated simultaneously at inputs H1 and H3, it
only becomes active at H3 (no configuration error).
User Manual LMS14...
6 The settings in detail
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CC1U7471en
28.01.2015