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Brief description
QAA73...
RVA47...
Building automation /
remote management
OCI / ACS
RVA63...
Service tool
10/171
Siemens Building Technologies
HVAC Products
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
QAC34...
Room thermostat /
time switch
Modulating room unit
RVA46...
LPB
RVA65...
RVA66...
Basic Documentation LMU54... / LMU64...
1 Overview
LMU...
OCI420
AGU2.500
LPB
Clip-in
Auxiliary modules
Human Machine Interface
(HMI)
AGU2.303...
AGU2.350...
AGU2.361...
AGU2.362...
AGU2.310...
AGU2.51x
0...10 V
4...20 mA
7494b01E/0702
CC1P7494en
07.11.2002
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