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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 1 Overview 07.11.2002
1 Overview
LMU... are Boiler Management Units (BMUs) of digital design for use with gas-fired
appliances equipped with premix burners.
They are used for the startup, control and supervision of premix burners having the
capacity ranges < 70 kW, 70 - 120 kW or > 120 kW in intermittent operation and with
direct ignition of the main flame.
The LMU... provide all supervisory and control functions required for burner, heating and
DHW operation and make possible modular system extensions via integrated
communication interfaces.
Output modulation is accomplished via a PWM-controlled fan, and pneumatic fuel / air
ratio control with the help of a gas valve.
1.1 System concept
7494b01E/0702
RVA47... RVA46...
LPB
QAA73...
OCI / ACS
OCI420
QAC34...
AGU2.500
LPB
Human Machine Interface
(HMI)
AGU2.303...
AGU2.361...
LMU...
AGU2.350...
AGU2.362...
Room thermostat /
time switch
Modulating room unit
Building automation /
remote management
Service tool
Clip-in
Auxiliary modules
RVA65...RVA63... RVA66...
AGU2.310...
AGU2.51x
0...10 V
4...20 mA
Brief description
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