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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 9 Electronic air-fuel ratio control 01.12.2009
9.6 Setting and parameter setting notes
• When making the settings for the electronic air-fuel ratio control system integrated
in the LMV37.4..., it must be ensured that sufficient amounts of excess air are avail-
able because over a period of time, the flue gas values is impacted by a number of
factors, such as air density, wear of the actuators and controlling elements, etc. For
this reason, the flue gas values initially set must be checked at regular intervals
• To safeguard against accidental or unauthorized transfer of parameters from the pa-
rameter backup of the ACS410 to the LMV37.4... basic unit, the OEM (burner or
boiler manufacturer) must enter an individual burner identification
for every burner.
Only when this requirement is satisfied does the LMV37.4... system make certain
that the ACS410 does not transfer a parameter set from a plant (with unsuited and
possibly dangerous parameter values) to the LMV37.4... basic unit
• With the LMV37.4..., it is to be noted that the unit’s characteristics are determined
primarily by the parameter settings and not so much by the type of unit. This means
that – among other considerations – the parameter settings must always be
checked prior to commissioning the plant, and that the LMV37.4... must never be
transferred from one plant to another without adapting the parameters to the new
plant
• When using the ACS410 PC software, the safety notes given in the relevant Operat-
ing Instructions (J7352) must also be observed
• The parameter level is password-protected. The OEM assigns individual passwords
for the parameter levels he can access. The unit is supplied with default passwords
entered by Siemens; they must be changed by the OEM. These passwords are con-
fidential and may only be assigned to authorized staff
• The responsibility for setting parameters is assumed by the person who, in accor-
dance with the access rights, has made changes on the respective setting level
In particular, the OEM assumes responsibility for the correct parameter settings
in compliance with the standards covering the specific applications (e.g.
EN 676, EN 267, EN 1643, etc.).
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