Siemens LMV50 Series Manual page 226

Correct parameterization
of the system
Fuel-air ratio
control system
226/327
Building Technologies
The parameterized values and setting values (e.g. curve characteristics) that define the
fuel-air ratio control system and – if used – the O2 trim control must be documented by
the individual responsible for plant / the heating engineer after the plant is installed and
commissioned. These data can be printed out with the help of the ACS450 PC
software, for example, or they must be put down in writing. These documents must be
kept in a safe place and are to be checked by the inspector.
Caution!
On the OEM level of the LMV5, it is possible to make parameter settings that
differ from application standards. For this reason, it is to be checked whether
parameterization is in compliance with the relevant application standards (e.g.
EN 298, EN 676, EN 267, etc.) or whether the respective plant must be approved
on an individual basis.
The following parameters are of particular importance:
The setting values (curve parameters) for the actuating devices, the types of fuel, and
the combustion air across the burner's load range must be stored in adequate
numbers. While considering the combustion chamber pressure, fuel pressure as well as
temperature and pressure of the combustion air, assignment of the selected setting
values of fuel and combustion air must be made such that correct operation with
sufficient amounts of excess air is ensured across the entire load range of the burner.
Proof of this must be delivered by the burner / boiler manufacturer by measuring the
combustion characteristics. When using a VSD, the fan is run to the steady-state
condition. Hence, the burner's rated load refers to the fan speed acquired with speed
standardization.
Basic Documentation LMV5...
14 Duties of the authorized inspector
CC1P7550en
22.05.2018