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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 2 13.08.2004
2 General
2.1 Brief description
The LMV5... is a microprocessor-based burner management system with matching sys-
tem components for the control and supervision of forced draft burners of medium to
large capacity.
The following components are integrated in the basic unit of the LMV5...:
• Burner control with gas valve proving system
• Electronic fuel / air ratio control system for a maximum of 4 actuators
• Optional PID temperature / pressure controller (load controller)
• VSD module
The system components (AZL5... display and operating unit, actuators, O2 module,
etc.) are interconnected via a bus system. Communication between the individual CAN
bus users’ takes place via a reliable, system-based data bus.
The safety concept makes use of 2 microprocessors for 2-channel signal processing.
It offers a very high level of safety and reliability for monitoring the software and the pro-
gram and control sequences.
All safety-related digital outputs of the system are permanently monitored via a contact
feedback network.
For flame supervision in connection with the LMV5..., universal infrared flame detectors
type QRI... or ionization probes can be used for continuous operation, and photoresistive
flame detectors type QRB... for intermittent operation.
Example: Dual-fuel burner
- Gas: Modulating
- Oil: 2-stage
Basic diagram
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