Siemens LMU54 Series Operator's manual

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

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Safety notes
Caution: The present Basic Documentation describes the broad range of applications and functions
offered by the LMU... and shall serve as a guideline. The correct functioning of the unit must
be checked and confirmed by functional tests on the boiler and / or on the relevant plant!
•Degree of protection IP 40 to EN 60 529 for burner controls must be ensured by the burner or boiler
manufacturer by adequately mounting the LMU...
•In the geographical areas where DIN standards apply, mounting and installation must be in compliance
with the relevant VDE requirements, especially DIN / VDE 0100, 0550 and DIN / VDE 0722!
•The electrical wiring inside the boiler must conform to country-specific and local regulations!
•Where (S)LTs are required, refer to the safety-related notes given in section «Electronic (S)LT»!
•It must be ensured that spliced individual wires cannot get in contact with adjacent terminals.
Use adequate ferrules!
•Prior to commissioning, check wiring and parameterization carefully!
The boiler manufacturer is responsible for the correct parameterization of the LMU..., which must be in
compliance with the relevant standards and regulations!
•When commissioning the plant, check all safety functions!
•Before performing any wiring changes or other work in the connection area of the LMU…, completely
isolate the unit from the mains supply!
•Lay high-voltage ignition cable completely separate from all other cables!
•Ensure protection against electric shock hazard on the LMU… and on all electrical connections
through appropriate mounting!
•There is no absolute protection against incorrect use of the RAST5 connectors.
For this reason, check the correct connector assignments prior to commissioning the plant!
•The burner manufacturer must ensure protection against electric shock hazard on all AC 230 V terminals
by fitting dummy plugs!
•When wiring the unit, AC 230 V mains voltage and extra low-voltage must always be run strictly
separate to warrant protection against electric shock hazard!
−DIN EN 60335
−DIN EN 60730-2-5
•Protect the mains-powered ionization probe against electric shock hazard!
The LMU… is a safety device!
•Do not open, interfere with or modify the unit!
•Siemens is not liable for damage resulting from unauthorized interference!
•In the event of blown fuses inside the LMU..., return the unit to Siemens!
(Customer may replace mains fuse F1 only once)
•Electromagnetic emissions must be checked on an application-specific basis!
To ensure the safety and reliability of the LMU..., the following points must also be observed:
−Condensation, formation of ice and ingress of water are not permitted!
If such conditions have occurred, make certain the unit is completely dry before switching on!
−Static charges must be avoided as they can damage the unit’s electronic components when touching them
Recommendation: Use ESD equipment!
U

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Contents
1Overview ..........................................................................................10
−Brief description..........................................................................10
1.1 System concept ..................................................................................10
1.2 Features............................................................................................11
−Safety functions ..........................................................................11
−Supervision / protective functions for the plant .................................11
−Auxiliary modules (clip-in).............................................................11
−DHW .........................................................................................12
−Heating circuit.............................................................................12
−System application ......................................................................12
−Operation / service......................................................................12
−Parameterization.........................................................................13
−Mains transformer........................................................................13
−Other features.............................................................................13
1.3 Product range.....................................................................................13
1.4 Field of use........................................................................................13
−Target market .............................................................................13
−Heating plants.............................................................................13
−Heat generating equipment...........................................................13
1.5 Notes on product liability......................................................................14
1.6 Notes on environmental protection........................................................14
−Disposal notes ............................................................................14
2Product range overview ....................................................................15
3Functions..........................................................................................17
3.1 Burner control ....................................................................................17
−Program selection .......................................................................17
−EEPROM...................................................................................17
−Forced intermittent operation ........................................................17
−Burner control program ................................................................17
−Sequence diagram ......................................................................18
−Capacity range < 70 kW............................................................18
−Capacity range 70...120 kW.......................................................18
−Capacity range > 120 kW..........................................................19
−Description of sequence diagrams..............................................19
−Sequence times.......................................................................20
−Standby..................................................................................20
−Startup ...................................................................................20
−Shutdown................................................................................22
−Home run................................................................................22
−Special cases (deviations).........................................................22
−LMU... plausibility checks of the speed parameters .......................24
−Parameterization of speed feedback signal..................................24
−Fan parameters accessible via QAA ...........................................25
−The different capacity ranges .....................................................26
−Setting the fan parameters during startup and shutdown................27
−Speed readjustment .................................................................28
3.2 Selection of the compensation variants..................................................30

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−Heating circuits...........................................................................30
−Room setpoint ............................................................................32
−Configuration of the heating circuits...............................................34
−DHW circuit................................................................................35
3.3 Acquisition of actual values ..................................................................37
−Assignment of analog sensors ......................................................37
−Temperatures .............................................................................37
−Display of ionization current..........................................................38
3.4 Supervisory functions ..........................................................................39
−Temperature limiter function.........................................................39
−Flue gas temperature supervision..................................................39
−Plausibility check of sensor .......................................................39
−Function.................................................................................39
−Electronic (S)LT..........................................................................40
−Handling faults ........................................................................40
−Flow switch / water pressure supervision........................................42
−Function of flow switch..............................................................42
−Function of pressure switch.......................................................42
−Pressure sensor..........................................................................42
−Static supervision.....................................................................43
−Dynamic supervision ................................................................44
−Load limitation............................................................................45
−Speed limitation..........................................................................48
−Limitation of ionization current.......................................................48
3.5 Boiler control......................................................................................49
−Frost protection for the boiler........................................................49
−Controller delay ..........................................................................49
−Controller delay due to parameterization.....................................49
−Controller delay due to SLT criterion...........................................50
−Controller configuration................................................................50
−Transfer of setpoint / actual value...............................................50
−Determining the controller coefficients ........................................50
−Heat output limits.....................................................................51
−Boiler temperature control............................................................52
−2-position control .....................................................................52
−Minimum boiler pause time........................................................52
−Boiler cycling protection...............................................................52
−Dynamic switch-off differential....................................................53
−Modulating control, conventional................................................54
3.6 Hydraulic system management (HSM)...................................................55
−Frost protection for the plant .........................................................55
3.7 Consumer management (CM) ..............................................................56
−Determining the demands for heat.................................................56
−Priorization of demands for heat ................................................56
−Determining the temperature demand............................................57
−Temperature limitation..............................................................58
−Summer / winter (S / W) changeover..............................................59
3.8 Electronically controlled PWM heating circuit pump.................................61
−General......................................................................................61
−Introduction................................................................................61
−Notes .....................................................................................61

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−Task of ∆T control with PWM pump ...............................................61
−First stage Maximum limitation of the flow temperature..................62
−Second stage ∆T limitation........................................................62
−Third stage ∆T supervision ........................................................63
−PWM pump control......................................................................63
−H-Q chart (example).................................................................63
−Adaption of modulating pump to the heating plant.........................64
−Parametes of the PWM pump (OEM).............................................64
−Preset parameters .......................................................................64
−Activation of PWM pump via a configuration byte.............................65
−Parameters of the PWM pump (installer) ........................................66
−Parameters for temperatures ........................................................66
−PID controller coefficients of delta-T supervision..............................67
−Summary of all ∆T parameters ......................................................67
−Behavior in different operating modes ............................................68
−Pump overrun..........................................................................68
−Normal operation (heating operation)..........................................68
−Reduced (setback) operation.....................................................68
−Shutdown mode.......................................................................68
−Heating up phase.....................................................................68
−DHW operation........................................................................69
3.9 Heating circuit control..........................................................................70
−Attenuated outside temperature .................................................70
−Composite outside temperature ...................................................71
−Type of building construction .....................................................71
−Heating curves.........................................................................72
−Generating the demands for heat ..................................................73
−Time switch.............................................................................74
−Room thermostat .....................................................................75
−RU .........................................................................................75
−Combinations of RU and room thermostat / time switch.................76
−ECO functions ............................................................................77
−S / W changeover.....................................................................77
−Automatic 24-hour heating limit..................................................77
−Quick setback constant (KON) ......................................................78
−Generating the temperature demands .............................................78
−With fixed value control or emergency operation...........................78
−With weather compensation.......................................................78
4Clip-in AGU2.500... for additional heating circuit.................................79
−Functions ...................................................................................79
−General...................................................................................79
−Hydraulic diagrams......................................................................79
−Sensor inputs (analog inputs)........................................................79
−Inputs / outputs...........................................................................79
−Interfaces for the LMU..................................................................80
−Sensor.......................................................................................80
−Frost protection...........................................................................80
−Overtemperature protection..........................................................80
−Mixing circuits..........................................................................80
−Determining the flow temperature setpoint ......................................80
−Handling the locking signal........................................................80

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−Handling the forced signal.........................................................80
−Flow temperature control..............................................................80
−Pump control..............................................................................81
−Pump control with pump circuits.................................................81
−Pump control with mixing circuits ...............................................81
−Pump overrun..........................................................................81
−Pump kick...............................................................................81
−Mixing valve control.....................................................................81
−Position of mixing valve in the idle state......................................81
−Functional test ............................................................................81
5Clip-in module OCI420... for communication via LPB..........................82
−Functions ...................................................................................82
−General ..................................................................................82
−Inputs / outputs...........................................................................82
−Interfaces to LMU........................................................................82
5.1 Connection of LMU... to ALBATROS via OCI420 (LPB clip-in) ..................82
5.1.1 Additional heating circuit extensions via ALBATROS controllers................82
−Automatic changeover of operating mode.......................................83
−Giving consideration to heat demand from the RVA…......................83
−Locking and forced signals when connecting to the LPB...................83
5.1.2 External DHW heating by ALBATROS controllers ...................................83
−Type of priority of DHW heating ....................................................84
5.1.3 Multiboiler plants with LMU (cascade applications)..................................84
−Separate DHW circuit in cascade applications.................................85
−Operation with the RVA65... .........................................................85
5.1.4 System functions ................................................................................86
−Uniform system time....................................................................86
−Error / diagnostic messages from the LMU......................................86
−Outside sensor, outside temperature sensor...................................88
−Assignment of address numbers................................................88
−Setting the LPB device and segment address.................................88
6Clip-in function module AGU2.51x .....................................................89
−Functions ...................................................................................89
−General ..................................................................................89
−Outputs......................................................................................89
−Number of available outputs......................................................89
−Inputs........................................................................................90
−Digital input .............................................................................90
−Analog input ............................................................................90
−Predefined setpoint (temperature demand)..................................90
−Predefined output ....................................................................91
−Sensor input “Pressureless header”............................................91
7DHW control (BWR) ..........................................................................93
−Boiler temperature setpoint during DHW heating with storage tank
systems .....................................................................................93
−DHW temperature control.............................................................94
−Compensation variants.............................................................94
−Position of diverting valve..........................................................95
−Storage tank systems...............................................................95
−Stratification storage tank..........................................................96

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−Instantaneous DHW system ........................................................100
−Notes ...................................................................................100
−Hydraulic diagram..................................................................100
−Operating mode........................................................................100
−Outlet temperature control (FS-DHW is closed)..........................100
−Comfort control (after FS-DHW opening)...................................100
−Aqua-booster system..................................................................103
−Hydraulic diagram..................................................................103
−Operating mode........................................................................103
−Outlet temperature control.......................................................103
−Comfort control......................................................................103
−Legionella function ....................................................................104
7.1 Special functions ..............................................................................105
−Forced signals ..........................................................................105
−Parameterization.......................................................................105
−Via PC tool ACS420 and OCI490... ..........................................105
−Via QAA73... / AGU2.310........................................................105
−Via AGU2.361 / AGU2.303......................................................106
−Programmable input of the LMU... ...............................................106
−Modem function.....................................................................106
−Warm air curtain function ........................................................106
−Programmable output of the LMU... .............................................107
−Status output.........................................................................107
−Alarm output..........................................................................107
−Operational status signal.........................................................107
−Switching off the external transformer .......................................108
−Pump output second heating circuit..........................................108
−DHW circulating pump............................................................108
−Actuating device with warm air curtain function activated.............108
−Pump of pressureless header ..................................................108
−Basic function of controller clip-in module..................................108
−Actuating device with full DHW charging activated......................108
−Actuating device when analog signal exceeds threshold..............109
−Power concept..........................................................................109
8Basic diagram.................................................................................110
8.1 LMU... .............................................................................................110
9Connection diagrams......................................................................111
9.1 LMU... .............................................................................................111
9.2 DHW stepper motor (bipolar)..............................................................112
9.3 AGU2.104A109................................................................................112
9.4 AGU2.500A109................................................................................113
9.5 AGU2.500A209................................................................................114
9.6 OCI420A109 ....................................................................................115
9.7 OCI420A209 ....................................................................................116
9.8 AGU2.51x ........................................................................................117
9.9 Connecting cable between OCI490... and PC.......................................118
9.10 Mounting, electrical installation and service..........................................119
−Mounting (general) ....................................................................119
−Mounting the LMU5x...............................................................119

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−Ignition device...........................................................................119
−Terminals and wiring .................................................................119
−Testing by the customer.............................................................120
10 Technical data ................................................................................121
10.1 LMU................................................................................................121
−General....................................................................................121
−Electrical connection data...........................................................122
−Cable lengths (LMU... ÖHMI and LMU... ÖClip-in).................126
−Connectors ..............................................................................126
10.2 Clip-in .............................................................................................127
10.2.1 AGU2.500........................................................................................127
−Outputs....................................................................................127
−Electrical connections................................................................127
−Input........................................................................................127
10.2.2 AGU2.51x........................................................................................127
−Outputs....................................................................................127
−Electrical connections................................................................127
−Input........................................................................................127
10.3 External components ........................................................................128
−RAST5 connectors ....................................................................128
−Mains transformer .....................................................................128
−Fan with DC 24 V motor.............................................................128
−Fan with DC motor operating on mains voltage..............................128
11 Dimensions....................................................................................129
11.1 LMU5x... .........................................................................................129
11.2 LMU6x... .........................................................................................130
11.3 AGU2.500A109 / AGU2.51xA109 .......................................................131
11.4 AGU2.500A209................................................................................132
11.5 OCI420A109....................................................................................133
11.6 OCI420A209....................................................................................134
11.7 Mounting plate for clip-in module ........................................................135
12 Parameter list / legend of parameter bit fields LMU...........................136
12.1 Parameter list...................................................................................136
−Parameter list LMU....................................................................136
−Temperatures........................................................................136
−Switching differentials.............................................................137
−Controller functions ................................................................137
−Controller times .....................................................................138
−Controller coefficients.............................................................138
−Pressures .............................................................................138
−Burner control fan ..................................................................139
−Burner control sequence.........................................................139
−Burner control identification.....................................................140
−Operating data......................................................................140
−MCI......................................................................................140
−LPB .....................................................................................140
12.2 Lockout position storage....................................................................141
−Phase designations / numbers ....................................................141

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12.3 Legend of parameter bit fields LMU.....................................................142
−Controller functions ................................................................142
−Burner control program...........................................................145
−Operating modes ...................................................................147
−LPB......................................................................................147
13 Glossary of abbreviations................................................................148
−Constants.................................................................................148
−Variables..................................................................................148
14 Addendum: Hydraulic diagrams BMU...............................................149
14.1 Hydraulic diagrams ...........................................................................149
−Basic diagrams.........................................................................149
−Pump circuit extensions via AGU2.500.........................................151
−Mixing circuit extensions via AGU2.500... .....................................153
−Zone extensions........................................................................156
−Heat generation manager...........................................................162
14.2 Assignment of hydraulic diagrams to the outputs of the LMU…...............166

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HVAC Products 1Overview 07.11.2002
1Overview
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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1.2 Features
Below, the full functionality of the LMU... is described. For information on the scope of
functions of a specific unit, refer to the relevant version / configuration.
•Gas burner control conforming to EN 298 for intermittent operation
•Integrated boiler / burner control for space heating and DHW operation
•Sequence control depending on the boiler’s capacity: < 70 kW, 70 - 120 kW, or > 120 kW.
Boiler capacities up to about 600 kW can be handled (depending on the type of fan /
gas valve used)
•Integrated electronic (safety) limit thermostat
•Integrated limit thermostat function
•Direct ignition of the main flame by means of
−integrated single-pole high-voltage ignition (with the choice of single-electrode
operation)
−external AC 230 V ignition control (optional)
•Continuous (analog) ionization current supervision with optional indication of flame
intensity
•Gas valve control AC 230 V (RAC optional)
•Number of start repetitions can be programmed
•Quick startup (especially in connection with instantaneous DHW systems)
•Fan supervision
•Optimization of combustion (optional)
•Control of an AC 230 V fan (DC 24 V fan optional)
•Ignition load precontrol via speed readjustment
•Adaptive postpurge level of fan speed
•Load limitation (fan limitation by minimum / maximum speed and / or flame signal)
•Number of fan feedback pulses can be selected
•Flame stabilization time
•Boiler cycling protection via minimum boiler off time
•Dynamic switch-off differentials for space heating (Hz) and DHW (Bw) operation
•Pump and diverting valve kick
•Frost protection functions for the plant, the boiler, DHW and the room
•Water pressure supervision (pressure sensor with static and / or dynamic supervision,
contact for pressure switch, flow switch)
•Flue gas temperature supervision
•OCI420 clip-in for communication, LPB interface for ALBATROS system world
•AGU2.500 clip-in for additional heating circuit
•AGU2.51x clip-in function module
- inputs:NTC, 10 kΩ
digital input
0(4)...20 mA
DC 0...10 V
- outputs:max. 3 relays AC230 V
Safety functions
Supervision / protective
functions for the plant
Auxiliary modules
(clip-in)

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•Integrated DHW systems with specific algorithms for storage tank, stratification
storage tank, instantaneous and aquabooster systems
•Instantaneous DHW heating systems with optional comfort function
•DHW heating with charging pump / diverting valve
•Diverting valve control via stepper motor control, N.O. contact with continuous phase
or changeover contact
•DHW control with sensor or thermostat
•Control of DHW circulating pump withQAA73...-V1.4
•Integrated weather-compensated pump heating circuit
•PWM-controlled heating circuit pump with specific algorithms to ensure most effective
condensation, improved overall efficiency and enhanced room comfort (optional)
•Additional weather-compensated heating circuit for single-user applications via
modular clip-in add-on module AGU2.500 (pump or mixing heating circuit) with
independent minimum / maximum limitation and heating curve.
Independent time switch program in connection with the QAA73...
•Automatic summer / winter changeover
•Automatic 24-hour heating limit (with no RU connected)
•Quick setback (with no RU connected)
•Compensation variants with room thermostat / time switch (single- or dual-channel
time switch)
•Compensation variants with room controls via integrated interface based on
OpenTherm (QAA73... / QAA53...)
•Integrated interface on OpenTherm basis
•Communication capability via the Local Process Bus (LPB) by means of clip-in
module
•Consistent system architecture of RVA… controllers
•Optional remote supervision
•Connection via LPB clip-in module to
−RVA46... zone controllers
−RVA47... cascade controllers
−RVA63... boiler and heating circuit controllers
−RVA65... energy managers for solar, wood, etc.
−RVA66... boiler and heating circuit controllers
−OCI6... communication interface for remote supervision (in connection with
appropriate ACS… software) 1)
•Modular and flexible concept of operating units AGU2.3...; optionally with housings for
flush panel mounting, degree of protection IPX4D (splash-proof) and LCD model with
clock function and backlit display
•Chimney sweep function
•Controller stop function for output adjustment
•Error messages with lockout storage and fault history
•Display and interrogation of all relevant process parameters via operating units,
QAA73... and PC tool
•Counter for the number of startups and the number of operating hours
•Maintenance functions with service message 1)
•Automatic plant configuration (identification of RU, connected HMI, sensors, etc.)
1) Planned; on request
DHW
Heating circuit
System application
Operation / service

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•Via PC tool ACS420
•Via room unit QAA73...
•Via operating units AGU2.3...
•Via specific final production test tool ACS421
•Mains transformer integrated in the unit
An additional external transformer is not absolutely required (only when using a fan
operating on DC 24 V, or in the case of stepper motor control).
•Multifunctional housing with mechanical attachment facility for maximum 2 clip-in
modules
−Integrated exchangeable main fuse AC 230 V
−Integrated installer interface via RAST5 connector
•Optional extensions with up to 2 flexible clip-in modules that can be matched to
individual customer needs
•Programmable relay output (AC 230 V) for specific functions
•Programmable digital input for specific functions
•Housing / clip-in modules of advanced design made of recyclable plastic
1.3 Product range
Refer to chapter 2, «Product range overview».
1.4 Field of use
The LMU... are designed for use by OEMs. They are supplied directly to the boiler
manufacturer and enhance both the functionality and the level of outfit of gas-fired
boilers.
Suited for all types of standard heating systems such as radiator or underfloor heating
systems in the residential sector (one-family houses or blocks of flats).
Primarily for use with:
•Premixing or condensing gas-fired appliances with modulating burners using PWM
DC fans and pneumatic fuel / air ratio control, in intermittent operation and with direct
ignition of the main flame
•Capacity ranges < 70 kW, 70...120 kW, or > 120 kW
•Heating boilers or combi boilers with DHW storage tanks or instantaneous DHW
heaters
Parameterization
Mains transformer
Other features
Target market
Heating plants
Heat generating
equipment

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1.5 Notes on product liability
•The units may only be used in building services plant in accordance with the
applications and features described above
•When using the products, all requirements specified in chapter «Technical data» must
be observed
•The local safety regulations must be complied with
1.6 Notes on environmental protection
The LMU... contains electrical and electronic components and may not be disposed of
together with household waste. Local and currently valid legislation must be
observed!
Disposal notes

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2Product range overview
RVA46... RVA47... RVA...
ACS6... / OCI6...
QAA73...
Room units
AGU2.5xx
QAC34...
QAL36...VDU...
OCI420...
LMU...
BMU
QAD36...
QAZ36...
Controllers
Clip-in modules
Gas valves / Mixer
Temp. sensors
Service remote
management
7494b02E/0802
HMI
AGU2.350 AGU2.361 AGU2.362AGU2.303 AGU2.310
AGU3.6...
The following units and accessories are designed for use with the ALBATROS range:
Type of unit Description Documentation no.
LMU54... BMU (without housing, without combustion optimization) CC1P7494 1)
LMU64... BMU (with housing, without combustion optimization) CC1P7494 1)
REA02... Room thermostat (RAA20) CE1N3002
REA11... Room temperature controller CE1P2274
RVA46... Heating controller CE1P2372
RVA47... Cascade controller for modulating gas-fired CE1P2379
heating boilers
RVA63... Heating circuit controller CE1P2373 2)
RVA65... Heat energy manager CE1P2392 2)
RVA66... Heating circuit or primary controller with DHW control CE1P2378 2)
OCI490A109 PC interface for ACS42X... --
ACS420 Software for OCI490A109
ACS421 Final production test software
ACS... Operating software CE1B2530 2)
OCI6... Central communication unit CE1N2530 / 2531 2)
BMU
Controller
Service tool
Remote supervision

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QAA73... RU for boiler control with OpenTherm interface CE1P2284
QAA53... RU for boiler control with OpenTherm interface CE1Q2282
AGU2.500A109 Clip-in for additional heating circuit
AGU2.500A209 Clip-in for additional heating circuit (printed circuit board version)
AGU2.511A109 Clip-in function module, voltage relay
AGU2.513A109 Clip-in function module, current relay
AGU2.514A109 Clip-in function module, sensor relay
AGU2.515A109 Clip-in function module, digital input relay
OCI420A109 Clip-in for communication LPB interface
OCI420A209 Clip-in for communication LPB interface (printed circuit board version)
VDUxxx Compact gas control loop with pneumatic fuel / air CC1N7662
ratio control
AGU3.6... Gas / air mixing device (pressure side) -- 2)
QAC34/101 Outside sensor NTC 1kΩCE1Q1811
QAD36/101 Strap-on temperature sensor NTC 10 kΩ--
QAK36... Screwed immersion temperature sensor NTC 10 kΩ-- 2)
QAL36.225 Universal temperature sensor NTC 10 kΩCE1Q1842
QAZ36.522/109 Cable temperature sensor NTC 10 kΩ, cable length 2 m CE1Q1843
QAZ36.526/109 Cable temperature sensor NTC 10 kΩ, cable length 6 m CE1Q1843
AQL21.30 Holding spring for QAL36.225, 30 mm --
AQL21.42 Holding spring for QAL36.225, 42 mm --
AGU2.350A109 Dummy cover, housing for flush panel mounting, 1)
degree of protection IPx4D
AGU2.361A109 Operating section for boiler, housing for flush panel mounting, 1)
degree of protection IPx4D
AGU2.362A109 Operating section for heating circuit, housing for flush panel mounting,1)
degree of protection IPx4D
AGU2.303B109 Operating section, type of printed circuit board 1)
AGU2.310A109 Operating unit with LCD (printed circuit board version) 1)
AGU2.100A109 Connecting cable LMU... ÖAGU2.303 / AGU2.361 / AGU2.310 1) 2)
AGU2.101A109 Connecting cable AGU2.361 ÖAGU2.362 1) 2)
AGU2.102A109 Connecting cable AGU2.361 Öcontrol panel mounting QAA73... 1) 2)
AGU2.103A109 Connecting cable service interface AGU2.361 ÖQAA73... 1) 2)
AGU2.104A109 Connecting cable LMU... ÖClip-in module AGU2.500 / OCI420 2)
1) Refer to Operating Instructions CC1B7494
2) On request
Room units
Clip-in modules
Gas valve
Sensor
Operating section
Cable

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3Functions
3.1 Burner control
Parameterization enables certain parts of the burner control program to be changed,
thus permitting a number of different burner control sequences.
The burner control sequences are distinguished by their capacity ranges in which the
boilers shall operate.
In accordance with the standards, there are 3 different capacity ranges:
•< 70 kW
•70...120 kW
•> 120 kW
For all capacity ranges, there are additional parameterization choices available,
enabling the burner control’s sequence and times to be matched to specific
requirements.
The EEPROM of the LMU... is used to store the burner control’s program sequence and
lockout positions.
Also, control parameters and other setting values are filed in EEPROM.
Forced intermittent operation ensures that the burner control initiates shutdown after no
more than 24 hours of continuous operation.
This enables the burner control to perform the internal self-tests included in the startup
and shutdown sequence.
The burner control’s program ensures orderly operation of the unit including startup and
shutdown as well as flame supervision.
The sequence can be altered by changing certain parameters.
If there are deviations from the defined sequence, or in the case of a reset, the program
initiates safety shutdown (home run) and then - depending on the setting made -
lockout, restart or start prevention.
The program sequence is controlled in accordance with the program’s phases. The
individual phases are grouped and include startup, operation, shutdown and home run.
After a reset (power on), the burner starts its home run. Depending on the available
(parameterized) input / output signals or program times (e.g. prepurging), the individual
program phases will be either executed or skipped.
The burner control’s program is designed for intermittent operation. To verify orderly
functioning (detection of faults), a complete program cycle is required.
In the «Standby» position, the burner control is ready to operate and waits for a heat
demand signal from the controller, or it demands start prevention (no release).
The burner control maintains the «Operation» position until no more heat is demanded
by the controller -but for no more than 24 hours. On completion of that period of time,
the burner control will automatically enforce intermittent operation.
Program selection
EEPROM
Forced intermittent
operation
Burner control program

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dependent on
parameter
setting
dependent on
parameter
setting
dependenton
parameter
setting
dependent on
parameter
setting
dependent on
parameter
setting
dependent on
parameter
setting
PH_
THL2 ZPH_ THL2 Z
22 0 1 2 3 654 10 Hz 11 Bw
12 Hz+Bw 20 2 4 7 21 99
HMI
display:
Phase
Home run
TLOTNB
Standby
ti
PH_TNB tv TBRE TW1 TW2 tvz tsa1 tsa2 tn
tsa
TNN tsa1 tsa2
tsa
THL2 tn
PH_TLO PH_TNN PH_
STANDBY PH_ STARTVER PH_ THL1_1 PH_TV PH_TBRE PH_TW1 PH_TW2 PH_TVZ PH_ TSA2_1 PH_TI
PH_
MODU-
LATION PH_ THL2_1 PH_TN_1
PH_
TSA1_1 PH_ TSA2_2
PH_
TSA1_2 PH_ THL2_2 PH_TN_2 PH_ STOER
THL1 PH_
THL1_2
THL1 (TW1)
PH_TW1
Flame
Heat demand
PH_
TSA1_2
PH_
STANDBY
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2
Z Z
7494f01e/0801
NoG_Null
BV
Ignition
LP (4)
NoG_Max
N_VL
N_TL
N_Vor
N_ZL
-N_TL_Delta
-N_ZL_Delta
+N_ZL_Delta
-N_Vor_Delta
+N_VL_Delta
LP (3)
LP (2)
ZZZZ
ZZ
ZZZZ
ZZ
Z
Z
PH_
THL2
Operation
ZZ
22 0 1 23654 10 Hz
11 Bw
12 Hz+Bw 20 2 4 7 21 99
HMI
display:
Phase
Home run
TLOTNB
Standby
ti
PH_TNB tv TBRE TW1 TW2 tvz tsa1 tsa2 tn
tsa
TNN tsa1 tsa2
tsa
THL2 tn
PH_TLO PH_TNN PH_
STANDBY PH_ STARTVER PH_ THL1_1 PH_TV PH_TBRE PH_TW1 PH_TW2 PH_TVZ PH_ TSA2_1 PH_TI
PH_
MODU-
LATION PH_ THL2_1 PH_TN_1
PH_
TSA1_1 PH_ TSA2_2
PH_
TSA1_2 PH_ THL2_2 PH_TN_2 PH_ STOER
THL1 PH_
THL1_2
THL1 (TW1)
PH_TW1
PH_
THL2 Z
R
PH_
THL2
PH_
THL2 Z
R
Flame PH_
TSA1_2
PH_
STANDBY
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2 ZZZ Z
7494f02e/0201
NoG_Null
BV
Ignition
LP (4)
NoG_Max
N_VL
N_TL
N_Vor
N_ZL
-N_TL_Delta
-N_ZL_Delta
+N_ZL_Delta
-N_Vor_Delta
+N_VL_Delta
dependent on
parameter
setting
LP (3)
LP (2)
ZZ
ZZ
ZZ
ZZ
Z
Z
R
ZZ
R
Z
RR
ZZ
RR
ZZ
RR
ZZ
R
Z
R
Heat demand
R
Logic on
Logic off
On deviation
transition to home run
Deviation leads to lockout
On deviation transition to
specified or following
phase
Control
Permitted range
Prohibitedrange
-> Home run
Prohibitedrange
-> Lockout
Ideal signal
Transition criterion
Control signal
Triggering forced prepurging
Repetition can be parameterized,
then lockout
Z
Operation
dependenton
parameter
setting
dependent on
parameter
setting
dependenton
parameter
setting
dependenton
parameter
setting
dependenton
parameter
setting
Sequence diagram
Capacity range < 70 kW
Capacity range 70...120 kW

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22 0123654 10 Hz
11 Bw
12 Hz+Bw 20 2 4 7 21 99
HMI
display:
Phase
Home run
TLOTNB
Standby
ti
PH_TNB tv TBRE TW1 TW2 tvz tsa1 tsa2 tn
tsa
TNN tsa1 tsa2
tsa
THL2 tn
PH_TLO PH_TNN PH_
STANDBY PH_ STARTVER PH_
THL1_1 PH_TV PH_TBRE PH_TW1 PH_TW2 PH_TVZ PH_ TSA2_1 PH_TI
PH_
MODU-
LATION PH_
THL2_1 PH_TN_1
PH_
TSA1_1 PH_ TSA2_2
PH_
TSA1_2 PH_ THL2_2 PH_TN_2 PH_ STOER
THL1 PH_
THL1_2
THL1 (TW1)
PH_TW1
7494f03e/0201
NoG_Null
BV
Ignition
LP (4)
NoG_Max
N_VL
N_TL
N_Vor
N_ZL
-N_TL_Delta
-N_ZL_Delta
+N_ZL_Delta
-N_Vor_Delta
+N_VL_Delta
dependent on
parameter
setting
LP (3)
LP (2)
ZZ
ZZ
ZZ
ZZ
Z
Z
PH_
THL2
Flame PH_
TSA1_2
PH_
STANDBY
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2
PH_
THL2 ZZZ Z
Heat demand
R
Logic on
Logic off
On deviation
transition to home run
Deviation leads to lockout
On deviation transition to
specified or following
phase
Control
Permitted range
Prohibited range
-> Home run
Prohibited range
-> Lockout
Ideal signal
Transition criterion
Control signal
Triggering forced prepurging
Repetition can be parameterized,
then lockout
Z
Operation
dependent on
parameter
setting
dependenton
parameter
setting
dependenton
parameter
setting
dependenton
parameter
setting
dependenton
parameter
setting
The burner control’s program is subdivided into different phases. Each phase is
identified by a certain output and input configuration of the burner control.
For the precise sequence of signals, refer to the sequence diagrams.
Signal sequences not shown in the sequence diagrams are summarized under «Special
cases».
The times given in the sequence diagrams are distinguished as follows:
UPPERCASE LETTERS (e.g. «THL1») constants stored in ROM
Lowercase letters (e.g. «tsa») parameters stored in EEPROM
With regard to the speed feedback signal, the following nominal levels are used:
N_Vor, N_VL, N_ZL, N_TL
Prepurging Nominal load 1) Ignition load Partial load
1) Previously «Full load» (VL)
Sequence diagram
Capacity range > 120 kW
Description of sequence
diagrams

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According to the sequence diagram, there is a permitted tolerance band with an upper
and a lower limit for each level (e.g. «N_ZL»), which is defined via parameter
«N_XX_Delta».
The relevant sequence phases (refer to the sequence diagrams) are queried for these
limits.
Example: Ignition load upper limit = «N_ZL» + «N_ZL_Delta»
lower limit =«N_ZL» - «N_ZL_Delta»
These limit values are complemented by «NoG_Null» and «NoG_Max» (refer to the
sequence diagrams).
«NoG_Max» is the maximum speed that must never be reached. «NoG_Null» is the low
speed that must be crossed when changing to standby.
Time Min.
(s) Max. (s) Response at end of Description
TNB 0.2 21.0 Lockout position Afterburn time
TLO 0.2 51.0 Lockout position Open LP
TNN 0.2 51.0 Lockout position Down to speed = 0
THL1 0.2 51.0 Lockout position First fan runup time
THL2 0.2 51.0 Lockout position Second fan runup time
tv 051.0 Switching Prepurging
TBRE 0.2 51.0 Lockout position Brake time until ignition load is reached
TW1 0.2 51.0 Lockout position Waiting for internal sequence, speed
readjustment and optimization of
combustion
tvz 0.2 5.0 Switching Preignition time
TSA 1.8 9.8 1) Ignitionsafety time
tsa1 0.2 9.6 2) 1) Ignition safety time with ignition
tsa2 0.2 TSA-tsa1 2) 1) Ignition safety time without ignition
ti 0.2 10 Switching Interval operation
tn 051.0 Switching Postpurging
1) Lockout position or start repetition, depending on the flame signal and the parameter;
various parameterization choices (refer to relevant description)
2) With parameterization with abortion of safety time in the case of flame detection, the times
of «tsa1» and «tsa2» are derived from the time of establishment of flame. It should be
noted, however, that «TSA» can never be exceeded
The following phases (with associated times in parentheses) are relevant with one
startup / shutdown cycle:
•PH_STANDBY (unlimited): Burner control waits for a heat demand signal from the
controller
•PH_STARTVER: No external or internal release, relevant diagnostic code is delivered
The change from «Standby» to «Operation» is the startup triggered by a heat demand
signal from the controller.
If startup takes place with prepurging, startup will commence with the «PH_THL1_1»
phase; if no prepurging is used, with the «PH_THL1_2» phase.
Sequence times
Standby
Startup