Siemens LMV37.400A2 - System Overview and Functionality; System Make-up and Function Description; System Configuration for Europe; System Configuration for North America

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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 2 System make-up / function description 01.12.2009
2 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.