Commissioning Notes - Siemens LMV27.100x2 Basic Documentation

Fuel / air ratio
control system
LMV27
Building Technologies
1.7

Commissioning notes


When commissioning the unit, check all safety functions

There is no absolute protection against incorrect use of the RASTx connectors. For
this reason, prior to commissioning the plant, check the correct assignment of all
connectors

Electromagnetic emissions must be checked on an application-specific basis
After the plant has been installed and commissioned, the person responsible for the
plant / heating engineer must document the parameterized values and settings (e.g.
curve characteristics) used for air-fuel ratio control.
These data can be printed out with the help of the ACS410 PC software, for example, or
must be written down.
This document must be kept in a safe place and checked by the expert.
Caution!
On the OEM level of the LMV27, parameter settings other than those specified in
the application standards can be made. For this reason, check whether the
parameter settings made are in compliance with the relevant application
standards (e.g. EN 676, EN 267, etc.), or whether the respective plant demands
special approval!
The selected setting values of fuel and combustion air must be assigned such that –
while giving consideration to the combustion chamber / fuel pressure, temperature and
combustion air pressure, as well as wear of actuators and controlling elements, etc. –
correct operation with sufficient amounts of excess air will be ensured across the
burner's full output range for an extensive period of time (until the next regular
inspection is due; also refer to chapter Monitoring the positions). This must be proven by
the burner / boiler manufacturer by measuring the characteristic combustion process
values. If the standardization process is repeated, the air-fuel ratio control system must
be rechecked.
Prior to commissioning the system, the following points must be checked:

Parameterization of operating mode (e.g. «G mod», «Gp1 mod», «Lo mod», etc.)
must accord with the type of burner used (refer to chapter Selection of operating
mode)

Correct assignment of the valves to the valve outputs of the LMV27

Correct setting of the time parameters, especially the safety and prepurge times

Correct functioning of the flame detector in the event of loss of flame during
operation (including the response time), with extraneous light, during the prepurge
time and, when there is no establishment of flame, at the end of the ignition safety
time

Activation of the valve proving function and determination of the correct leakage
rate, if required by the application (refer to chapter Valve proving)
Basic Documentation LMV27...
1 Safety notes
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CC1P7541en
17.12.2018