Makeup Of Structure / Function Description; For Europe; For North America - Siemens LMV37.4 Series Basic Documentation

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Building Technologies
2 Makeup of structure / function
description
The LMV37.4 is a microprocessor-based burner management system with matching
system components for the control and supervision of forced draft burners of medium to
high capacity.
Integrated in the LMV37.4 are:

Burner management system complete with valve proving system

Electronic fuel-air ratio control system for a maximum of 2 SQM3 or SQN1
actuators

Control of VSD air fan

Modbus interface
Figure 4: System structure
Example: Modulating gas burner
The system components (AZL2, actuators) are connected directly to the LMV37.4. All
safety-related digital inputs and outputs of the LMV37.4 are monitored by a contact
feedback network.
The diagram shows the maximum functionality of the LMV37.4. The actual functions are
to be determined based on the respective execution / configuration.

2.1 For Europe

For intermittent operation in connection with the LMV37.4, the ionization probe or the
QRA, QRB or QRC optical flame detectors can be used. Continuous operation is
possible only when using an ionization probe.

2.2 For North America

For intermittent operation could in connection with the LMV37.4, the ionization probe or
the optical flame detector QRA or QRB can be used. Continuous operation is
possible only when using an ionization probe.
Basic documentation LMV37.4...

2 Makeup of structure / function description

CC1P7546en
17.12.2018