User Manual

ManualsBrandsSiemens ManualsBoiler EquipmentBoiler Management Unit LMU7

CC1N7495en

20.04.2016

Building Technologies Division

495

Boiler Management Unit

(BMU)

LMU74...

LMU75...

LMU7… are digital Boiler Management Units (BMUs) for use in gas-fired applianc-

es equipped with premixing burners.

LMU74…  without combustion optimization

LMU75…  with combustion optimization

The LMU7… and this Data Sheet are intended for use by OEMs which integrate

the BMUs in their products.

Use

The LMU7... provide all supervisory and control functions required for burner, space

heating and DHW operation and – using integrated communication interfaces – facili-

tate modular system extensions.

They are especially suited for:

 Premixing or condensing gas-fired appliances with burners modulating via PWM fan

and pneumatic gas / air ratio control in intermittent operation, with direct ignition of

the main flame

 Capacity ranges < 70 kW, 70...120 kW and > 120 kW

 Heating boilers or combi boilers with DHW storage tanks or instantaneous DHW

heaters

Attention!

All safety, warning and technical notes given in the Basic Documentation of the

LMU7… (P7495) and in the User Manual (U7495) also apply to this document!

Summary of content (18 pages)

PAGE 1
7 Boiler Management Unit (BMU) 495 LMU74... LMU75... LMU7… are digital Boiler Management Units (BMUs) for use in gas-fired appliances equipped with premixing burners. LMU74…  without combustion optimization LMU75…  with combustion optimization The LMU7… and this Data Sheet are intended for use by OEMs which integrate the BMUs in their products. Use The LMU7...
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Supplementary documentation Environmental Product Declaration LMU74... / LMU75... …… .............................. E7495 Extended OEM User Manual (setting lists)…… ........................................................I7495 Extended OEM User Manual (setting lists) Sitherm Pro…… ............................... I7495.1 Basic Documentation LMU7... ................................................................................ P7495 Basic Documentation Sitherm Pro ...........................................
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Standards and certificates Applied directives:  Low-voltage directive  Directive for gas-fired appliances  Electromagnetic compatibility EMC (immunity) *) 2014/35/EC 2009/142/EC 2014/30/EC *) The compliance with EMC emission requirements must be checked after the Boiler Management Unit is installed in equipment Compliance with the regulations of the applied directives is verified by the adherence to the following standards / regulations:  Automatic burner control systems for burners and appliancDIN E
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Mechanical design REA02... QAA75... REA11... QAA55... RVS... ACS... / OCI... OCI420... AGU2.5... VGU... AGU3... AVS37.294 AVS37.390 Basic operator unit (PCB version) 7475b02e/0513 LMU7... 4/18 Building Technologies Division CC1N7495en 20.04.
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Technical data LMU7...
PAGE 6
Technical data (cont’d) Total current of all mains components connected to the LMU7...
PAGE 7
Technical data (cont’d) External ignition module (X3-03) - Voltage - Current AC 230 V +10 % / -15 % 5 mA…0.5 A, cos > 0.8 must still ignite at AC 175 V Max. 3 m - Cable length Any external ignition modules used must be approved by Siemens to ensure their switching performance meets the requirements! Fan speed (X14) Refer to separate Siemens specification: Spezifikation_LMU5x_TrafoGebläse_de_VX.Y.
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Technical data (cont’d) Pressure sensor (X11) - Output voltage LMU7... - Current - Input voltage LMU7... - Cable length - Huba Control - Huba Control - Imit Heating circuit Flow Switch (X11) - Output voltage LMU7... - Contact resistance - Cable length DHW Flow Switch (X11) - Output voltage LMU7... - Contact resistance - Cable length Safety shutdown / gas pressure switch (X10-03) - Output voltage LMU7...
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Technical data (cont’d) BSB users Electrical connections Operator unit (X30) Room unit (X16) - Connection - Cable length - Cable resistance - Cross-sectional area Users PWM control for heating circuit pump (X11) - PWM frequency - Output voltage LMU7... - Cable length DHW thermostat of the DHW sensor input - Voltage - Current AVS37... QAA55... / QAA75... 2- or 3-wire Max. 200 m Max. 3 x 14  Min. 0.5 mm² Max. 4 (1 operator unit, 2 room units, 1 service unit) Preconditions: 1. Only one QAA75...
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Technical data (cont´d) Mechanical design - AGU2.500x109 - AGU2.500x209 ClipIn AGU2.500... Housing version PCB version Outputs Mixing circuit pump and mixer Electrical connection - Voltage - Current - Mains frequency Note: With regards to the outputs, the total current draw of the LMU7...
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Technical data (cont´d) ClipIn AGU2.51... Outputs   Maximum 3 outputs (K1...K3) When using 2 ClipIns with the LMU7..., only 2 outputs possible Electrical connection - Voltage - Current - Mains frequency AC 230 V +10 % / -15 % 5 mA…1 A, cos >0.8 50 Hz ±5 % Note: With regard to the outputs K1...K, the total current draw of the LMU7... system must be taken into consideration! Degree of protection IP00 Min.
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Technical data (cont´d) Solar ClipIn AGU2.530A109 Outputs Free programmable Electrical connection - Voltage - Current - Mains frequency Note With regard to the outputs, the total current draw of the LMU7...
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Technical data (cont´d) Degree of protection LPB ClipIn OCI420… IP00 Min. IP40 (must be ensured when fitted inside the boiler) III (SELV) 2 To DIN EN 730-2-5 Class A Safety class Degree of pollution Software classes - Controller part Housing - Material - Color - Flame protection class Environmental conditions Polycarbonate RAL 7035 (light-grey) To UL 94: V-2 Storage Climatic conditions Mechanical conditions Temperature range Humidity Transport DIN EN 60 721-3-1 Class 1K3 Class 1M2 -20...
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Functions Heat source boiler                       Electronic temperature controller Minimum and maximum limitation of the boiler temperature Optimum start control with minimum limitation of the boiler temperature Boiler overtemperature protection (pump overrun) Burner cycling protection via minimum burner running time Frost protection boiler Forced intermittent operation Burner control programs for 3 capacity ranges Acquisition of actual values Flue gas temperature supervision Elect
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Functions (cont’d)          General  Automatic summer- / wintertime changeover Standard time programs Multifunctional inputs and outputs Connection facility for mixing valve module for 2nd mixing / pump circuit Connection facility for service tool (via OCI700…) Connection facility for remote supervision (via OCI611...
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Basic diagram AC 230 V Lockout (STB, TB) RAC 26 V Safety shutdown (GP) Room thermostat 1 or time switch Room thermostat 2 or time switch RAC 26 V AC 230 V RAC 26 V 4 RAC 26 V Heating circuit pressure switch BV1 AC 230 V or RAC 230 V Fuel valve BV2 external ignition module modulated PWM fan AC 230 V AC 230 V Heating circuit pump PWM-moduliert RAC 26 V DHW FlowSwitch or DHW thermostat AC 230 V DHW pump 1 or diverting valve RAC 26 V Programmable digital input e.g.
PAGE 17
Basic diagram (cont'd) AC 230 V Lockout (STB, TB) RAC 26 V Safety shutdown (GP) Room thermostat 1 or time switch Room thermostat 2 or time switch Heating circuit pressure switch Fuel valves BV2 external ignition module RAC 26 V AC 230 V RAC 26 V 4 modulated PWM fan AC 230 V RAC 26 V 6 Stepper motor control (combustion optimization) RAC 26 V M AC 230 V DHW FlowSwitch or DHW thermostat Heating circuit pump RAC 26 V Programmable digital input e.g.
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Dimensions Dimensions in mm LMU7... 156 115 48,5 29 max. 47 x) 7,5 7,5 67 73 115 137,5 5 (7 O 3, 145 162,75 24 11 59 18/18 Building Technologies Division 156 170 7495m01/0805 2016 Siemens AG Building Technologies Division, Berliner Ring 23, D-76437 Rastatt Subject to change! CC1N7495en 20.04.