System Make-Up / Function Description; For Europe; For North America - Siemens LMV37.4 Series Basic Documentation

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System make-up / 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 basic unit of the LMV37.4... are:
•
Burner management system complete with valve proving system
•
Electronic air-fuel ratio control system for a maximum of 2 SQM3... or SQN1... ac-
tuators
•
Control VSD air fan
•
Modbus interface
Example: Modulating gas burner
The system components (display and operating unit, actuators) are connected directly to
the LMV37.4... basic unit. All safety-related digital inputs and outputs of the system are
monitored by a contact feedback network.

2.1 For Europe

For intermittent operation in connection with the LMV37.4..., the ionization probe or the
QRA..., QRB... or QRC... optical flame detector 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 QRA4... or QRB... can be used. Continuous operation is
possible only when using an ionization probe.
Basic documentation LMV37.4...
2 System make-up / function description
CC1P7546en
01.12.2009