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Siemens Manuals
Control Unit
LMU54 Series
Basic documentation
Siemens LMU54 Series Basic Documentation
Boiler management unit (bmu)
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
1 Overview
Brief Description
System Concept
Features
Safety Functions
Supervision / Protective Functions for the Plant
Auxiliary Modules (Clip-In)
Dhw
Heating Circuit
System Application
Operation / Service
Parameterization
Mains Transformer
Other Features
Product Range
Field of Use
Target Market
Heating Plants
Heat Generating Equipment
Notes on Product Liability
Notes on Environmental Protection
Disposal Notes
2 Product Range Overview
3 Functions
Burner Control
Program Selection
Eeprom
Forced Intermittent Operation
Burner Control Program
Sequence Diagram
Capacity Range < 70 Kw
Capacity Range 70
Capacity Range > 120 Kw
Description of Sequence Diagrams
Sequence Times
Standby
Startup
Shutdown
Home Run
Special Cases (Deviations)
Lmu
Parameterization of Speed Feedback Signal
Fan Parameters Accessible Via QAA
The Different Capacity Ranges
Setting the Fan Parameters During Startup and Shutdown
Speed Readjustment
Selection of the Compensation Variants
Heating Circuits
Room Setpoint
Configuration of the Heating Circuits
DHW Circuit
Acquisition of Actual Values
Assignment of Analog Sensors
Temperatures
Display of Ionization Current
Supervisory Functions
Temperature Limiter Function
Flue Gas Temperature Supervision
Plausibility Check of Sensor
Function
Electronic (S)LT
Handling Faults
Flow Switch / Water Pressure Supervision
Function of Flow Switch
Function of Pressure Switch
Pressure Sensor
Static Supervision
Dynamic Supervision
Load Limitation
Speed Limitation
Limitation of Ionization Current
Boiler Control
Frost Protection for the Boiler
Controller Delay
Controller Delay Due to Parameterization
Controller Delay Due to SLT Criterion
Controller Configuration
Transfer of Setpoint / Actual Value
Determining the Controller Coefficients
Heat Output Limits
Boiler Temperature Control
2-Position Control
Minimum Boiler Pause Time
Boiler Cycling Protection
Dynamic Switch-Off Differential
Modulating Control, Conventional
Hydraulic System Management (HSM)
Frost Protection for the Plant
Consumer Management (CM)
Determining the Demands for Heat
Priorization of Demands for Heat
Determining the Temperature Demand
Temperature Limitation
Summer / Winter (S / W) Changeover
Electronically Controlled PWM Heating Circuit Pump
General
Introduction
Notes
Task of ∆T Control with PWM Pump
First Stage Maximum Limitation of the Flow Temperature
Second Stage ∆T Limitation
Third Stage ∆T Supervision
PWM Pump Control
H-Q Chart (Example)
Adaption of Modulating Pump to the Heating Plant
Parametes of the PWM Pump (OEM)
Preset Parameters
Activation of PWM Pump Via a Configuration Byte
Parameters of the PWM Pump (Installer)
Parameters for Temperatures
PID Controller Coefficients of Delta-T Supervision
Summary of All ∆T Parameters
Behavior in Different Operating Modes
Pump Overrun
Normal Operation (Heating Operation)
Reduced (Setback) Operation
Shutdown Mode
Heating up Phase
DHW Operation
Heating Circuit Control
Attenuated Outside Temperature
Composite Outside Temperature
Type of Building Construction
Heating Curves
Generating the Demands for Heat
Time Switch
Room Thermostat
Combinations of RU and Room Thermostat / Time Switch
ECO Functions
S / W Changeover
Automatic 24-Hour Heating Limit
Quick Setback Constant (KON)
Generating the Temperature Demands
With Fixed Value Control or Emergency Operation
With Weather Compensation
4 Clip-In AGU2.500
Functions
General
Hydraulic Diagrams
Sensor Inputs (Analog Inputs)
Inputs / Outputs
Interfaces for the LMU
Sensor
Frost Protection
Overtemperature Protection
Mixing Circuits
Determining the Flow Temperature Setpoint
Handling the Locking Signal
Handling the Forced Signal
Flow Temperature Control
Pump Control
Pump Control with Pump Circuits
Pump Control with Mixing Circuits
Pump Overrun
Pump Kick
Mixing Valve Control
Position of Mixing Valve in the Idle State
Functional Test
5 Clip-In Module OCI420
Functions
General
Inputs / Outputs
Interfaces to LMU
Connection of LMU
Additional Heating Circuit Extensions Via ALBATROS Controllers
Automatic Changeover of Operating Mode
Giving Consideration to Heat Demand from the RVA
Locking and Forced Signals When Connecting to the LPB
External DHW Heating by ALBATROS Controllers
Type of Priority of DHW Heating
Multiboiler Plants with LMU (Cascade Applications)
Separate DHW Circuit in Cascade Applications
Operation with the RVA65
System Functions
Uniform System Time
Error / Diagnostic Messages from the LMU
Outside Sensor, Outside Temperature Sensor
Assignment of Address Numbers
Setting the LPB Device and Segment Address
6 Clip-In Function Module Agu2.51X
Functions
General
Outputs
Number of Available Outputs
Inputs
Digital Input
Analog Input
Predefined Setpoint (Temperature Demand)
Predefined Output
Sensor Input "Pressureless Header
7 DHW Control (BWR)
Boiler Temperature Setpoint During DHW Heating with Storage Tank
Systems
DHW Temperature Control
Compensation Variants
Position of Diverting Valve
Storage Tank Systems
Stratification Storage Tank
Instantaneous DHW System
Notes
Hydraulic Diagram
Operating Mode
Outlet Temperature Control (FS-DHW Is Closed)
Comfort Control (after FS-DHW Opening)
Aqua-Booster System
Hydraulic Diagram
Operating Mode
Outlet Temperature Control
Comfort Control
Legionella Function
Special Functions
Forced Signals
Parameterization
Via PC Tool ACS420 and OCI490
Via QAA73
Via AGU2.361 / AGU2.303
Programmable Input of the LMU
Modem Function
Warm Air Curtain Function
Programmable Output of the LMU
Status Output
Alarm Output
Operational Status Signal
Switching off the External Transformer
Pump Output Second Heating Circuit
DHW Circulating Pump
Actuating Device with Warm Air Curtain Function Activated
Pump of Pressureless Header
Basic Function of Controller Clip-In Module
Actuating Device with Full DHW Charging Activated
Actuating Device When Analog Signal Exceeds Threshold
Power Concept
8 Basic Diagram
Lmu
9 Connection Diagrams
Lmu
DHW Stepper Motor (Bipolar)
Agu2.104A109
Agu2.500A109
Agu2.500A209
Oci420A109
Oci420A209
Agu2.51X
Connecting Cable between OCI490
Mounting, Electrical Installation and Service
Mounting (General)
Mounting the Lmu5X
Ignition Device
Terminals and Wiring
Testing by the Customer
10 Technical Data
Lmu
General
Electrical Connection Data
Cable Lengths (LMU
Connectors
Clip-In
Agu2.500
Outputs
Electrical Connections
Input
Agu2.51X
External Components
RAST5 Connectors
Mains Transformer
Fan with DC 24 V Motor
Fan with DC Motor Operating on Mains Voltage
11 Dimensions
Lmu5X
Lmu6X
AGU2.500A109 / Agu2.51Xa109
Agu2.500A209
Oci420A109
Oci420A209
Mounting Plate for Clip-In Module
12 Parameter List / Legend of Parameter Bit Fields LMU
Parameter List
Parameter List LMU
Temperatures
Switching Differentials
Controller Functions
Controller Times
Controller Coefficients
Pressures
Burner Control Fan
Burner Control Sequence
Burner Control Identification
Operating Data
MCI
Lpb
Lockout Position Storage
Phase Designations / Numbers
Legend of Parameter Bit Fields LMU
Controller Functions
Burner Control Program
Operating Modes
Lpb
13 Glossary of Abbreviations
Constants
Variables
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Brief Description
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LMU54... / LMU64...
Boiler Management Unit (BMU)
Basic Documentation
Software version 2. 08
Siemens Building Technologies
CC1P7494en
HVAC Products
07.11.2002
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Lmu64 series
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