Siemens LMV37.4 Series Operator's manual

Software version
V03.40
CC1P7546en
20.09.2013 Building Technologies Division
Infrastructure & Cities Sector
LMV37.4...
Basic unit with integrated air-fuel ratio control for
forced draft burners
Basic Documentation
The LMV37.4... and this Basic Documentation are intended for OEMs which integrate the units in their
products!

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Supplementary documentation
User Documentation Modbus AZL2... .....................................................................A7541
Environmental Product Declaration LMV2… / LMV3...............................................E7541
Installation and Operating Instructions PC Software ACS410................................. J7352
Data ‘Sheet LMV37.4... .......................................................................................... N7546
Product Range Overview LMV2… / LMV3... .......................................................... Q7541

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Contents
1Safety notes ................................................................................................. 12
1.1 Warning notes ...............................................................................................12
1.2 Mounting notes .............................................................................................. 13
1.3 Installation notes............................................................................................ 14
1.4 Electrical connection of the LMV37.4... ......................................................... 15
1.5 Electrical connection of flame detectors........................................................16
1.6 Commissioning notes .................................................................................... 16
1.7 Notes on settings and parameter settings.....................................................18
1.8 Standards and certificates.............................................................................19
1.9 Service notes.................................................................................................19
1.10 Life cycle........................................................................................................19
1.11 Disposal notes ............................................................................................... 19
2System structure/function description......................................................20
2.1 For Europe.....................................................................................................20
2.2 For North America .........................................................................................20
2.3 General information ....................................................................................... 21
3Type summary ............................................................................................. 21
4Technical Data ............................................................................................. 22
4.1 Basic unit LMV37.4........................................................................................22
4.1.1 Terminal loading «Inputs» .............................................................................22
4.1.2 Terminal loading «Outputs» .......................................................................... 23
4.1.3 Analog output / load output X74 pin 3 ...........................................................25
4.1.4 Cable lengths.................................................................................................25
4.1.5 Cross-sectional areas....................................................................................25
4.1.6 Connections of actuators............................................................................... 25
4.2 Signal cable AGV50... from AZL2... BCI ...................................................26
4.3 Environmental conditions ..............................................................................26
4.4 Flame detector...............................................................................................27
4.4.1 Ionization probe.............................................................................................27
4.4.2 UV flame detectors QRA2 / QRA4 / QRA10..................................................29
4.4.3 Photoresistive flame detectors QRB… .......................................................... 30
4.4.4 Blue-flame detectors QRC….........................................................................31
5Dimensions ..................................................................................................32
5.1 LMV37.4... ..................................................................................................... 32
6Display and diagnostics .............................................................................33
7Basic unit ..................................................................................................... 34
7.1 Description of inputs and outputs .................................................................. 34
7.2 Flame detectors.............................................................................................35
7.2.1 Loss of flame ................................................................................................. 36
7.2.2 Extraneous light.............................................................................................37
7.2.3 No flame at the end of safety time 1 (TSA1) ................................................. 37

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7.2.4 Flame intensity...............................................................................................37
7.2.5 Supervision of flame detector ........................................................................37
7.3 Digital inputs ..................................................................................................38
7.3.1 Safety loop X3–04 pin 1 and 2.......................................................................38
7.3.2 (Burner flange) X3–03, pin 1 and 2................................................................39
7.3.3 Input for external controller (ON / OFF) X5–03, pin 1....................................39
7.3.4 Inputs X5-03 pin 2 and 3 (Open / Close or stage 2 / stage 3)........................39
7.3.5 Air pressure switch (APS) X3–02...................................................................40
7.3.6 Gas pressure switch valve proving (P LT) – or heavy oil direct start X9-04 ..41
7.3.7 Gas / oil pressure switch-min (Pmin), start release gas X5–01 .....................43
7.3.8 Setting the time for making the pressure switch test .....................................44
7.3.9 Gas / oil pressure switch-max (Pmax) / or POC contact, start release oil X5–
02...................................................................................................................45
7.3.10 Reset X8-04, pin 1 .........................................................................................47
7.4 Digital outputs ................................................................................................48
7.4.1 Output alarm type No-SI – X3–05, pin 2........................................................48
7.4.2 Fan motor contactor type SI – X3–05, pin 1 ..................................................48
7.4.3 Fan continuous purging X3–05, pin 3 ............................................................48
7.4.4 Output ignition (Z) type SI (IGNITION) X4–02 ...............................................49
7.4.5 Outputs fuel valves type SI (V1...V3 / PV) X8–02, X7-01, X7-02...................50
7.4.6 Output safety valve (SV) type SI X6–03 ........................................................50
7.4.7 Output for indication of operation X8-04, pin 2 ..............................................50
7.5 Program sequence.........................................................................................51
7.5.1 Time parameters............................................................................................51
7.5.2 Valve proving .................................................................................................52
7.5.2.1. Valve proving with separate pressure switch (P LT) X9-04 ...........................53
7.5.2.2. Valve proving via gas pressure switch-min X5-01 .........................................54
7.5.2.3. Lockout phase (phase 00) .............................................................................54
7.5.2.4. Safety phase (phase 01)................................................................................55
7.5.3 Special functions during the program sequence............................................56
7.5.3.1. Reset / manual lockout ..................................................................................56
7.5.3.2. Alarm upon start prevention...........................................................................57
7.5.3.3. Possible start preventions..............................................................................58
7.5.3.4. Repetition counter..........................................................................................58
7.5.3.5. Start without prepurging (as per EN 676) ......................................................61
7.5.3.6. Gas shortage program...................................................................................61
7.5.3.7. Program stop function....................................................................................62
7.5.3.8. Forced intermittent operation (<24 hours) .....................................................62
7.5.3.9. Low-fire shutdown..........................................................................................62
7.5.3.10. Continuous fan...............................................................................................63
7.5.3.11. Test function for approval of burner – loss-of-flame test (TÜV test) ..............64
7.5.3.12. Purging in the lockout position .......................................................................65
7.5.3.13. Switching back to pilot ...................................................................................66
7.6 Fuel trains (application examples) .................................................................69
7.7 Sequence diagrams.......................................................................................78
7.7.1 Gas direct ignition «G», «G mod», «G mod pneu»........................................79
7.7.2 Gas pilot ignition 1 «Gp1», «Gp1 mod», «Gp1 mod pneu»...........................80
7.7.3 Gas pilot ignition 2 «Gp2», «Gp2 mod», «Gp2 mod pneu»...........................81
7.7.4 Light oil direct ignition «Lo», «Lo mod», «Lo 2-stage», «Lo 3-stage» ...........82

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7.7.5 Light oil pilot ignition «Lo Gp» ....................................................................... 83
7.7.6 Heavy oil direct ignition «HO», «HO m. Umsp mod», «HO m. Umsp 2-stage»
with separate circulation control .................................................................... 84
7.7.7 Heavy oil direct ignition «HO», «HO o. Umsp mod», «HO o. Umsp 2-stage»,
«HO o. Umsp 3-stage» without separate circulation control ......................... 85
7.7.8 Legend to the sequence diagrams ................................................................ 86
8Selection of operating mode ......................................................................89
8.1 Deleting curves..............................................................................................91
9Connection to load controllers ..................................................................92
9.1 Controller on contact X5-03 pin 1 .................................................................. 92
9.2 External load controller via contacts X5-03, pin 2 / pin 3...............................92
9.3 Default output via building automation – X92 ................................................ 95
9.4 Manual output................................................................................................ 96
9.5 Output with curve settings .............................................................................96
9.6 External load controller via analog input X64 pin 1 / X64 pin 2 .....................97
9.6.1 Switching thresholds for modulating operation.............................................. 97
9.6.2 Switching thresholds for multistage operation............................................... 98
9.7 Prioritization of load sources ......................................................................... 99
9.7.1 Emergency operation with several load controllers .......................................99
9.7.2 Manual control ...............................................................................................99
10 Electronic air-fuel ratio control ................................................................100
10.1 General........................................................................................................ 100
10.2 Behavior outside the operating positions..................................................... 100
10.2.1 Traveling speed ........................................................................................... 100
10.2.2 Home position..............................................................................................100
10.2.3 Prepurging ...................................................................................................101
10.2.4 Ignition ......................................................................................................... 101
10.2.5 Postpurging .................................................................................................101
10.3 Modulating operation...................................................................................102
10.3.1 Definition of curves ...................................................................................... 102
10.3.2 Traveling speed / maximum curve slope .....................................................103
10.3.3 Entering the running position....................................................................... 104
10.3.4 Operating position .......................................................................................104
10.3.5 Limitation of modulation range ....................................................................105
10.3.6 Setting the minimum and maximum output ................................................. 106
10.4 Multistage operation .................................................................................... 107
10.4.1 Definition of curves ...................................................................................... 107
10.4.2 Traveling speed ........................................................................................... 107
10.4.3 Adjustment of output....................................................................................108
10.4.4 Entering the operating position.................................................................... 108
10.4.5 Operating position .......................................................................................108
10.4.6 Limitation of modulation range ....................................................................109
10.5 End of operating position............................................................................. 109
10.6 Notes on settings and parameter settings...................................................110
11 Actuators X53 / X54 ................................................................................... 111

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11.1 Function principle.........................................................................................111
11.2 Definition of angles ......................................................................................111
11.3 Referencing..................................................................................................112
11.3.1 Reference travel...........................................................................................113
11.4 Direction of rotation......................................................................................115
11.5 Monitoring the actuator positions .................................................................116
11.6 Changing the error detection band for monitoring the actuator positions ....118
11.7 Forced travel................................................................................................118
11.8 Detection of line interruptions ......................................................................118
11.9 Protection against actuator mixup................................................................119
11.9.1 Proposal for implementation ........................................................................119
12 Fan control .................................................................................................120
12.1 Function principle.........................................................................................120
12.2 Activation of VSD/PWM fan .........................................................................120
12.3 VSD control X74 pin 3..................................................................................121
12.4 PWM fan control X64 pin 3 ..........................................................................121
12.5 Safe separation of mains voltage and protective extra low-voltage.............122
12.6 Ramp time....................................................................................................122
12.7 Acquisition of speed.....................................................................................123
12.7.1 Acquisition of speed with proximity switch...................................................123
12.7.2 Acquisition of speed with Hall generator......................................................124
12.8 Speed control...............................................................................................125
12.9 Speed supervision .......................................................................................126
12.10 Setting the parameters of VSD ....................................................................127
12.11 Standardization of speed .............................................................................128
12.12 Control of fan motor with pneumatic air-fuel ratio control ............................131
12.13 EMC of LMV37.4... and VSD .......................................................................131
12.14 Description of connection terminals.............................................................132
12.14.1 VSD..............................................................................................................132
12.14.2 PWM fan ......................................................................................................132
13 Load output X74 pin 3 ...............................................................................133
13.1 Safe separation of mains voltage and extra low-voltage ............................133
13.2 Modulating operation ...................................................................................133
13.3 2-stage operation.........................................................................................133
13.4 3-stage operation.........................................................................................134
14 Fuel meter input X75 pin 1 / X75 pin 2 .....................................................135
14.1 Configuration of fuel meter...........................................................................135
14.1.1 Types of fuel meters ....................................................................................135
14.1.2 Configuration of pulses per volume unit.......................................................135
14.1.3 Reading and resetting the meter readings...................................................135
14.2 Fuel throughput............................................................................................136
14.2.1 Configuration................................................................................................136
14.2.2 Reading out the fuel throughput...................................................................136

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15 Connection and internal diagram ............................................................ 137
16 Special feature: Burner identification (ID)............................................... 138
17 Connection to superposed systems........................................................138
17.1 General information and building automation functions .............................. 138
17.2 Modbus........................................................................................................ 140
18 PC software ACS410 .................................................................................141
19 Error history...............................................................................................142
19.1 Error classes................................................................................................142
19.2 Makeup of error history................................................................................ 143
20 Lifecycle function...................................................................................... 143
21 Safety notes on use of the AZL2… .......................................................... 144
22 Operating the AZL2… unit ........................................................................ 145
22.1 Description of unit/display and buttons........................................................ 145
22.2 Meaning of symbols on the display ............................................................. 146
22.3 Brightness of display ...................................................................................146
22.4 Special functions ......................................................................................... 147
22.4.1 Manual lockout ............................................................................................147
22.4.2 Manual control (manual request for output).................................................147
22.5 Timeout for menu operation ........................................................................148
22.6 Backup / restore ..........................................................................................149
22.6.1 Backup.........................................................................................................150
22.6.2 Restore........................................................................................................ 152
23 Operation of basic unit via the AZL2… ...................................................154
23.1 Normal display............................................................................................. 154
23.1.1 Display in standby mode ............................................................................. 154
23.1.2 Display during startup / shutdown ............................................................... 154
23.1.2.1. Display of program phases.......................................................................... 154
23.1.2.2. Display of program phase with remaining running time until end of the phase
is reached .................................................................................................... 154
23.1.2.3. List of phase displays ..................................................................................155
23.1.3 Display of operating position .......................................................................156
23.1.4 Fault status message, display of errors and info ......................................... 157
23.1.4.1. Display of errors (faults) with lockout........................................................... 157
23.1.4.2. Reset ........................................................................................................... 157
23.1.4.3. Activating info / service mode from lockout .................................................157
23.1.4.4. Error with safety shutdown ..........................................................................158
23.1.4.5. General information ..................................................................................... 158
23.1.4.6. Start prevention ...........................................................................................158
23.1.4.7. Safety loop...................................................................................................158
24 Menu-driven operation..............................................................................159
24.1 Assignment of levels.................................................................................... 159
25 Info level ..................................................................................................... 160

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25.1 Display of info level ......................................................................................161
25.2 Display of info values (examples) ................................................................161
25.2.1 Identification date.........................................................................................161
25.2.2 Identification number....................................................................................161
25.2.3 Burner identification .....................................................................................162
25.2.4 Number of startups resettable......................................................................162
25.2.5 Total number of startups ..............................................................................163
25.2.6 End of info level ...........................................................................................163
26 Service level ...............................................................................................164
26.1 Display of service level ................................................................................164
26.2 Display of service values (example) ............................................................165
26.2.1 Number of faults...........................................................................................165
26.2.2 Error history .................................................................................................165
26.2.3 Intensity of flame..........................................................................................165
26.2.4 End of service level......................................................................................165
27 Parameter level ..........................................................................................166
27.1 Entry of password ........................................................................................167
27.2 Entry of burner identification ........................................................................169
27.3 Change of heating engineer’s password......................................................170
27.4 Change of OEM’s password ........................................................................171
27.5 Use of parameter level.................................................................................171
27.6 Structure of parameter levels.......................................................................172
27.7 Parameters without index, with direct display..............................................173
27.7.1 Using the example of parameter 208: Program stop ...................................173
27.8 Parameters without index, with no direct display (with parameters having a
value range >5 digits) ..................................................................................175
27.8.1 Using the example of parameter 162: Operating hours resettable ..............175
27.9 Parameter with index, with direct display.....................................................177
27.9.1 Using the example of parameter 501: No-flame positions fuel actuator ......177
27.10 Parameters with index, with no direct display..............................................179
27.10.1 Using the example of parameter 701: Errors...............................................179
27.11 Air-fuel ratio curves – settings and commissioning......................................182
27.11.1 Initial commissioning....................................................................................182
27.11.2 Setting curvepoints P0 and P9 for modulating mode («G mod», «Gp1 mod»,
«Gp2 mod» and «Lo mod»).........................................................................185
27.11.3 Setting curvepoints P0 and P9 for «G mod pneu», «Gp1 mod pneu» and
«Gp2 mod pneu» .........................................................................................187
27.11.4 Warm settings for modulating mode («G mod», «Gp1 mod», «Gp2 mod» and
«Lo mod» and «Ho mod») ...........................................................................188
27.11.5 Warm settings for modulating mode («G mod pneu», «Gp1 mod pneu» and
«Gp2 mod pneu») ........................................................................................193
27.11.6 Cold settings for «G mod», «Gp1 mod», «Gp2 mod» and «Lo mod» and «Ho
mod» ............................................................................................................193
27.11.7 Cold settings for «G mod pneu», «Gp1 mod pneu» and «Gp2 mod pneu».193
27.11.8 Editing the curvepoints.................................................................................194
27.11.9 Interpolation of curvepoints..........................................................................195

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27.11.10 Setting of curvepoints for multistage mode («Lo 2-stage», «Lo 3-stage», «Ho
2-stage» and «Ho 3-stage»)........................................................................198
27.11.11 Warm settings for «Lo 2-stage», «Lo 3-stage», «Ho 2-stage» and «Ho 3-
stage»..........................................................................................................199
27.11.12 Cold settings for multistage mode («Lo 2-stage», «Lo 3-stage», «Ho 2-stage»
and «Ho 3-stage»)....................................................................................... 203
27.11.13 Intensity of flame during curve settings .......................................................203
28 Parameter list LMV37.4... .......................................................................... 204
29 Error code list ............................................................................................216
30 Revision history of basic unit LMV37.4................................................... 229
31 List of figures.............................................................................................233

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1 Safety notes
1.1 Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes must be observed!
LMV37.4... are safety devices! Do not open, interfere with or modify the units.
Siemens does not assume responsibility for damage resulting from unauthorized
interference!
The chapters covering the LMV37.4... contain additional warning notes which
should also be observed when using the different unit versions!
After commissioning and after each service visit, check the flue gas values
across the entire output range!
The present Basic Documentation describes a wide choice of applications and functions
and shall serve as a guideline. The correct functioning of the units is to be checked and
proven by function checks on a test rig or on the plant itself!
All activities (mounting, installation and service work, etc.) must be performed by
qualified personnel
Degree of protection IP40 as per DIN EN 60529 for the basic unit must be ensured
through adequate mounting of the LMV37.4... by the burner or boiler manufacturer
Before making any wiring changes in the connection area, completely isolate the
plant from mains supply (all-polar disconnection). Ensure that the plant cannot be
inadvertently switched on again and that it is indeed dead. If not disconnected, there
is a risk of electric shock hazard
Protection against electric shock hazard on the LMV37.4... and on all connected
electrical components must be ensured through adequate mounting. In terms of
design, stability and protection, the cover used must conform to EN 60730
After each activity (mounting, installation and service work, etc.), check to ensure
that wiring is in an orderly state and that the parameters are correctly set
Fall or shock can adversely affect the safety functions. Such units must not be put
into operation even if they do not exhibit any damage
When programming the air-fuel ratio control curves, the commissioning engineer
must constantly watch the quality of the combustion process (e.g. by means of a
flue gas analyzer) and, in the event of poor combustion values or dangerous
conditions, take appropriate actions, e.g. by shutting down the system manually
The following plug-on terminations carry FELV (Functional Extra Low-Voltage) (also
refer to chapter Electrical connection of the LMV37.4...) which means that they do not
provide safe separation from mains voltage:
- The BCI (X56) for the connecting cable of the AZL2... or PC software ACS410
- COM (X92) for accessories, such as the OCI410...
These plug-on terminations may be removed or replaced only when the plant is dead
(all-polar disconnection)
The connectors of the connecting cables for the LMV37.4... or other accessories,
such as the OCI410... (plugged into the BCI), may only be removed or exchanged
when the plant is shut down (all-polar disconnection), since the BCI interface does
not provide safe separation from mains voltage
The connections for the SQM3… or SQN1... actuators do not provide safe
separation from mains voltage. Prior to connecting or changing one of these
actuators, the plant must be shut down (all-polar disconnection)

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To ensure safety and reliability of the LMV37.4... system, the following points must also
be observed:
-Condensation and ingress of humidity must be avoided. Should such conditions
occur, make sure that the unit is completed dry before switching on again!
-Static charges must be avoided since they can damage the unit’s electronic
components when touched.
Recommendation: Use ESD equipment
-If the unit fuse was blown due to overload or a short-circuit at the connection
terminals, the LMV37.4... must be replaced since the switching contacts might have
been damaged
-If error codes 95…98 appear during operation, this may be an indication of contact
problems and the LMV37.4... should be replaced
1.2 Mounting notes
Ensure that the relevant national safety regulations and standard notes are
complied with
In geographical areas where DIN regulations are in use, the requirements of VDE
must be satisfied, especially DIN / VDE 0100, 0550 and DIN / VDE 0722
The LMV37.4... basic unit must be secured with fixing screws M4 (UNC32) or M5
(UNC24), observing a maximum tightening torque of 1.8 Nm and using all 4 fixing
points. The additional mounting surfaces on the housing are provided to improve
mechanical stability. These must fully rest on the mounting surface to which the unit
is secured. The flatness of that mounting surface must be within a tolerance band of
0.3 mm
122
(103.5)
6.5
103.5 10
217
M5 x 4
0,3
Bild 365./0409
Additional mounting
surfaces
Outer contour of housing
Figure 1: Note on mounting
Note on mounting

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1.3 Installation notes
Always run the high-voltage ignition cables separate from the unit and other cables
while observing the greatest possible distances
Ensure that the electrical wiring inside the boiler is in compliance with national and
local safety regulations
Mains power must always be supplied via Land N. This means that no potential
differential must exist between the neutral conductor Nand protective earth PE
Phase and neutral conductor must not be interchanged (dangerous malfunctions,
loss of protection against electric shock hazard, etc.)
Make certain that strain relief of the connected cables is in compliance with the
relevant standards (e.g. as per DIN EN 60730 and DIN EN 60335)
Ensure that spliced wires cannot get into contact with neighboring terminals. Use
adequate ferrules
Run the high-voltage ignition cable completely separate from all other cables
The burner manufacturer must protect unused terminals of the LMV37.4... by fitting
dummy plugs (exception: X64 (reserve) and X74)
When making the wiring, the AC 120 V or AC 230 V section must be strictly
separated from other voltage sections, thus ensuring protection against electric
shock hazard. For more detailed information, refer to chapter Electrical connection
of the LMV37.4...
The connectors of the connecting cables for the LMV37.4... may only be removed
or exchanged when the plant is turned off (all-polar disconnection), since the BCI
interface does not provide safe separation from mains voltage
AGV50... signal cable between LMV37.4... and AZL2...
Since the BCI carries FELV (refer to chapter Electrical connection of the
LMV37.4...), the connection between LMV37.4... and AZL2... must be established
via the AGV50... signal cable, or by ensuring compliance with the specification. The
signal cable is specified for use under the burner hood. When using other types of
signal cable that do not meet the specification requirements, safety against electric
shock hazard is not necessarily ensured
Do not lay signal cable AGV50... from the LMV37.4... to the AZL2… together with
other cables
Service operation with a longer signal cable from the LMV37.4...:
If a longer signal cable is required for service work for example (short-time usage,
<24 hours), note that the above application under the burner hood no longer applies
and, for this reason, the signal cable can be subjected to increased mechanical
stress. In that case, use a reinforced signal cable
Both the AGV50... signal cable and the AZL2… must be shipped and stored so that
no damage due to dust and water can occur when the products are used in the
plant
To ensure protection against electric shock hazard, make certain that, prior to
switching on power, the AGV50... signal cable is correctly connected to the AZL2…
The AZL2… must be used in a dry and clean environment
The mechanical coupling between the actuators and the controlling elements for
fuel and air, or any other controlling elements, must be rigid

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1.4 Electrical connection of the LMV37.4...
The LMV37.4... operates with the following low-voltages:
SELV (Safety Extra Low-Voltage) and PELV (Protective Extra Low-Voltage) ensure
protection against electric shock hazard
FELV (Functional Extra Low-Voltage) without safe separation offers no protection
which, in the event of fault, would not exclude risks
Mains voltage
SELV PELV FELV
Mains voltage
Figure 2: Electrical connection

Note
SELV or PELV depends on the safety class of the connected components. In the case
of PELV, the relevant component is connected to protective earth.

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1.5 Electrical connection of flame detectors
It is important to achieve practically disturbance- and loss-free signal transmission:
Never run the detector cables together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
Observe the permissible detector cable lengths
The mains-powered ionization probe is not protected against electric shock hazard.
It must be protected against accidental contact
Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice
Locate the ignition electrode and the ionization probe such that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads)
1.6 Commissioning notes
When commissioning the unit, check all safety functions
There is no absolute protection against incorrect use of the RASTx connectors. For
this reason, prior to commissioning the plant, check the correct assignment of all
connectors
Electromagnetic emissions must be checked on an application-specific basis
After the plant has been installed and commissioned, the person responsible for the
plant / heating engineer must document the parameterized values and settings (e.g.
curve characteristics)used for air-fuel ratio control.
These data can be printed out with the help of the ACS410 PC software, for example, or
must be written down.
This document must be kept in a safe place and checked by the expert.
Caution!
On the OEM level of the LMV37.4..., parameter settings other than those
specified in the application standards can be made. For this reason, check
whether the parameter settings made are in compliance with the relevant
application standards (e.g. EN 676, EN 267, etc.), or whether the respective
plant demands special approval!
The selected setting values of fuel and combustion air must be assigned such that –
while giving consideration to the combustion chamber / fuel pressure, temperature and
combustion air pressure, as well as wear of actuators and controlling elements, etc. –
correct operation with sufficient amounts of excess air is ensured across the burner’s full
output range for an extensive period of time (until the next regular inspection is due; also
refer to chapter Monitoring the positions). This must be proven by the burner / boiler
manufacturer by measuring the characteristic combustion process values. If the
standardization process is repeated, the air-fuel ratio control system must be rechecked.
Prior to commissioning the system, the following points must be checked:
Parameterization of operating mode (e.g. «G mod», «Gp1 mod», «Lo mod», etc.)
must accord with the type of burner used (refer to chapter Selection of operating
mode)
Correct assignment of the valves to the valve outputs of the LMV37.4...
Correct setting of the time parameters, especially the safety and prepurge times
Correct functioning of the flame detector in the event of loss of flame during
operation (including the response time), with extraneous light, during the prepurge
time and, when there is no establishment of flame, at the end of the safety time
Activation of the valve proving function and determination of the correct leakage
rate, if required by the application (refer to chapter Valve proving)
A
ir-fuel ratio
control system
Basic unit section

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The functions of the following available or required input status signals must be
checked:
Air pressure
Minimum gas pressure / maximum gas pressure or POC
Gas pressure valve proving
Minimum oil pressure and maximum oil pressure
Safety loop (e.g. safety limiter)
Duties of the expert when making the approval tests
Action Check / response
a) Burner startup with flame detector
darkened
Lockout at the end of safety time 1 (TSA1)
b) Burner startup with flame detector exposed to
extraneous light, e.g. to incandescent light with
detectors for visible radiation, quartz-halogen bulb
or cigarette lighter flame with detectors for UV
radiation
Lockout at prepurge time (t1)
c) Simulation of loss of flame during operation. For
that, darken the flame detector in the operating
position and maintain that state
Lockout or restart, depending on the basic unit’s
configuration
d) Check the plant’s response time with loss of flame
during operation. For that purpose, manually
disconnect the fuel valves from power and check
the time from this moment the basic unit requires to
turn off power to the valve
Turning off power to the valves by the basic unit within
the period of time permitted for the respective type of
plant
e) Check the safe operation of the burner while giving
consideration to system tolerances
System tolerances are the result of a number of factors,
such as:
-Tolerances of actuators plus mechanical linkage to
the controlling elements
-Environmental conditions
(temperature, air conditions)
-Type of fuel (calorific value / pressure)
-Type of supply air path and flue ways
Example of procedure for checking the burner’s
response to actuator tolerances:
-Approach a output point in programming mode (e.g.
low-fire or high-fire)
-Change the actuator’s position against the optimum
fuel-air ratio setting as can be expected in the case
of tolerances
-Check the flue gas values with a flue gas analyzer
Recommendation:
Make this readjustment against the optimum fuel-air
ratio setting for one actuator at a time!
Further checks may be required, depending on the field of use and the relevant
standards.

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1.7 Notes on settings and parameter settings
When adjusting the electronic air-fuel ratio control system integrated in the
LMV37.4..., allow for sufficient amounts of excess air since – over a period of time –
the flue gas settings are affected by a number of factors (e.g. density of air, wear of
actuators and controlling elements, etc.). For this reason, the flue gas values initially
set must be checked at regular intervals
To safeguard against inadvertent or unauthorized parameter transfer from the PC
software to the basic unit, the OEM must assign an individual burner
identification (ID) for each burner. Compliance with this regulation is mandatory to
ensure that the LMV37.4... system prevents the transfer of parameter sets of some
other plant (with inadequate and possibly dangerous parameter values) to the
LMV37.4… system via the PC software. In addition, the air-fuel ratio control
parameters must be manually approached and the combustion values checked
With the LMV37.4... system, it is to be noted that the unit’s characteristics are
determined primarily by the specific parameter settings rather than the type of unit.
This means that, among other things, each time a plant is commissioned, the
parameter settings must be checked and the LMV37.4... must not be transferred
from one plant to another without adapting the parameter settings to the new plant
When using the ACS410 PC software, the safety notes given in the relevant
Installation and Operating Instructions (J7352) must also be observed
A password protects the parameter level against unauthorized access. The OEM
allocates individual passwords to the setting levels he can access. The default
passwords used by Siemens must be changed by the OEM. These passwords are
confidential and may only be given to persons authorized to access such setting
levels
The responsibility for setting the parameters lies with the person who – in
accordance with his access rights – made changes to the respective setting level
In particular, the OEM (burner and / or boiler manufacturer) assumes
responsibility for the correct parameter settings in compliance with the standards
covering the specific applications (e.g. EN 676, EN 267, EN 746-2, etc.).

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1.8 Standards and certificates
Conformity to EEC directives
- Electromagnetic compatibility EMC (immunity)
- Directive for gas-fired appliances
- Low-voltage directive
- Directive for pressure devices
2004/108/EC
2009/142/EC
2006/95/EC
97/23/EC
ISO 9001: 2008
Cert. 00739
ISO 14001: 2004
Cert. 38233
Test specifications:
EN 230, EN 298, EN 1643, EN 12067-2, EN 13611
Type
LMV37.400A1 --- --- --- ●●●●
LMV37.400A2 --- --- --- ●●●●
LMV37.420A1 ●●●●●●●
1.9 Service notes
If fuses are blown, the unit must be returned to Siemens (refer to chapter
Warning notes)
1.10 Life cycle
The burner management system LMV3… has a designed lifetime* of 250,000 burner
startup cycles which, under normal operating conditions in heating mode, correspond to
approx. 10 years of usage (starting from the production date given on the type field).
This lifetime is based on the endurance tests specified in standard EN 230 / EN 298.
A summary of the conditions has been published by the European Control
Manufacturers Association (Afecor) (www.afecor.org).
The designed lifetime is based on use of the basic unit according to the manufacturer’s
Basic documentation. After reaching the designed lifetime in terms of the number of
burner startup cycles, or the respective time of usage, the basic unit is to be replaced by
authorized personnel.
* The designed lifetime is not the warranty time specified in the Terms of Delivery
1.11 Disposal notes
The unit contains electrical and electronic components and must not be disposed of
together with household waste. Local and currently valid legislation must be observed.

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Industry Sector 2 System structure/function description 20.09.2013
2 System structure/function description
The LMV37.4... is a microprocessor-based burner management system with matching
system components for the control and supervision of forced draft burners of medium to
high capacity.
Integrated in the basic unit of the LMV37.4... are:
Burner management system complete with valve proving system
Electronic air-fuel ratio control system for a maximum of 2 SQM3... or SQN1...
actuators
Control of VSD air fan
Modbus interface
Figure 3: System structure
Example: Modulating gas burner
The system components (display and operating unit, actuators) are connected directly to
the LMV37.4... basic unit. All safety-related digital inputs and outputs of the system are
monitored by a contact feedback network.
2.1 For Europe
For intermittent operation in connection with the LMV37.4..., the ionization probe or the
QRA..., QRB… or QRC... optical flame detectors can be used. Continuous operation
is possible only when using an ionization probe.
2.2 For North America
For intermittent operation could in connection with the LMV37.4..., the ionization probe
or the optical flame detector QRA... or QRB... can be used. Continuous operation is
possible only when using an ionization probe.