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Siemens LMU54 Series

Siemens LMU54 Series
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Software version 2. 08
CC1P7494en
07.11.2002
Siemens Building Technologies
HVAC Products
LMU54... / LMU64...
Boiler Management Unit (BMU)
Basic Documentation

Table of Contents

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Siemens LMU54 Series Specifications

General IconGeneral
Frequency50/60 Hz
Flame supervisionIonisation, UV
ApplicationBurner control
Input Voltage24 V AC/DC
Operating Temperature-20...+60 °C
Relative HumidityUp to 95% (non-condensing)

Summary

Overview

Features

Detailed description of the LMU's functionalities and capabilities.

Functions

Burner control

Detailed explanation of the burner control program, sequences, and parameters.

Selection of the compensation variants

How to select compensation variants for heating and DHW circuits based on plant components.

Supervisory functions

Explains various safety and monitoring functions like temperature and pressure supervision.

Boiler control

Covers boiler control logic, including frost protection and temperature regulation.

Electronically controlled PWM heating circuit pump

Details the control of the PWM heating circuit pump and its stages.

Clip-in AGU2.500... for additional heating circuit

Clip-in module OCI420... for communication via LPB

Clip-in function module AGU2.51 x

DHW control (BWR)

Boiler temperature setpoint during DHW heating with storage tank systems

How boiler setpoints are managed for DHW heating with storage tanks.

DHW temperature control

Explains the compensation variants for DHW temperature control.

Instantaneous DHW system

Details the operation and control of instantaneous DHW heating systems.

Special functions

Explains special operational modes and parameterization options for the LMU.

Connection diagrams

9.1 LMU...

Comprehensive connection diagram for the LMU unit and its terminals.

Technical data

10.1 LMU...

Electrical and environmental specifications for the LMU unit.

Parameter list legend of parameter bit fields LMU...

12.1 Parameter list

Detailed table of parameters for temperatures, switching differentials, and controller functions.

12.3 Legend of parameter bit fields LMU...

Explanation of bit fields within various configuration registers.

Addendum: Hydraulic diagrams BMU

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