General Notes On Risks And Problems - Siemens LMS14 User Manual

Restrictions
Human failure
Safety-related parameters
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6.28.6 General notes on risks and problems

These are not arbitrary data, but parameter values created for a specific type of boiler.
The following errors can occur:
1. The parameter set written to a boiler does not match.
2. A boiler receives a partial parameter set that does not match and now receives a
mixture of parameters.
The resulting malfunctions and risks are unpredictable.
If selecting a wrong data set which – due to lacking checking criteria – is nonetheless
compatible, the LMS14... can be parameterized for a completely different (unsuitable)
type of boiler. Here, the persons creating the data sets must define the compatibility
conditions as accurately as possible. The name assigned to the data set should be a
practical one (maximum 16 characters). This name appears on the unit's operator
section before parameter reading into the LMS14... can be started. The heating
engineer can compare the displayed text (name of data set) with the type of boiler, thus
preventing the transfer of wrong data sets. Data set name and boiler type should
match.
If using a parameter set whose possible checks have been completely canceled (refer
to chapter All possible checks canceled), a wrong parameter set might be transferred to
the (replacement) LMS14... – due to a mistake made by the heating engineer. This
could lead to wrong safety times, wrong speed limits or wrong switch-off thresholds.
This can result in excessive boiler temperatures. In the case of a boiler operating with
Sitherm Pro, this could lead to an unfavorable control curve, causing the boiler to
produce high emission levels.
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015