User Manual

ManualsBrandsSiemens ManualsBoiler EquipmentBoiler Management Units (BMUs) LMU5, LMU6

CC1N7494en

20.04.2016

Building Technologies Division

494

LMU5…

LMU6…

Boiler Management Units

(BMUs)

LMU5...

LMU6...

LMU5... / LMU6… are digital Boiler Management Units (BMUs) for use in gas-fired

appliances equipped with premixing burners.

The LMU5… / LMU6... and this Data Sheet are intended for OEMs which integrate

the BMUs in their products!

Use

The LMU5… / LMU6... provide all supervisory and control functions required for burner,

space heating and DHW operation and – using integrated communication interfaces –

facilitate 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



Note!

Do not use for new designs.

Attention!

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

LMU5… / LMU6… (P7494) also apply to this document!

Summary of content (9 pages)

PAGE 1
7 LMU5… 494 LMU6… Boiler Management Units (BMUs) LMU5... LMU6... LMU5... / LMU6… are digital Boiler Management Units (BMUs) for use in gas-fired appliances equipped with premixing burners. The LMU5… / LMU6... and this Data Sheet are intended for OEMs which integrate the BMUs in their products! Use The LMU5… / LMU6... provide all supervisory and control functions required for burner, space heating and DHW operation and – using integrated communication interfaces – facilitate modular system extensions.
PAGE 2
Supplementary documentation Extended User Manual OEM (setting lists)…… ........................................................I7494 Basic Documentation LMU5… / LMU6 ................................................................... P7494 Range Overview LMU5… / LMU6… ....................................................................... Q7494 User Manual LMU5… / LMU6…… ..........................................................................
PAGE 3
System structure LMU... QAC34... REA02... Outside sensor Room thermostat / time switch AGU2.303... AGU2.350... AGU2.361... AGU2.362... QAA73... Room unit RVA47... Building automation / remote management Operating units (HMI) RVA46... Cascade controller AGU2.310... / AGU2.311... Heating circuit controller OCI420 AGU2.500 AGU2.51... LPB OCI... / ACS... AGU2.53... RVA63... RVA65... RVA66...
PAGE 4
Technical data Operating voltage General  AC 230 V +10 % / -15 % Note! Ensure that conductors L and N are correctly connected! Mains frequency Power consumption Rated surge voltage category Degree of protection Safety class Pollution degree Software classes - Controller section - Burner control Dimensions (L x H x D) - Without housing - With housing Weight - Without housing - With housing Housing (only LMU6…) - Material - Color - Flame protection class Mounting position Attention! Ensure adequate diss
PAGE 5
Technical data (cont’d) Total current, all mains components connected to the LMU5… / LMU6... and the ClipIns Safety temperature limiter - Voltage - Current Electrical connections Fuel valve - AC output - Current  5 A (at UN = AC 230 V; Tu = 60 °C) AC 230 V +10 % / -24 % 5 mA…1 A, cos > 0.6 carrying power supply for fuel valve and ignition AC 230 V +10 % / -24 % valve must still open at AC 175 V 5 mA…0.5 A, cos > 0.8 5 mA…0.2 A, cos > 0.
PAGE 6
Technical data (cont’d) Electrical connections Boiler temperature sensor Return temperature sensor DHW temperature sensor Flue gas temperature sensor Outside sensor Pressure sensor - Input voltage LMU5… / LMU6... - Pressure value Room thermostat / time switch - Output voltage LMU5… / LMU6... - Contact resistance - Cable length Room unit - Connection - Cable length - Cable resistance - Power consumption NTC 10 k NTC 10 k NTC 10 k NTC 10 k NTC 1 k DC 0.5…3.5 V can be freely parameterized up to 9.
PAGE 7
Functions Heat source boiler                   Minimum and maximum limitation of boiler temperature Forced intermittent operation Burner control programs for 3 capacity ranges Acquisition of actual value Supervision of flue gas temperature Electronic (Safety)Temperature Limiter) Temperature limiter function Proof of flow / supervision of water pressure Pressure sensor Output / speed limitation Limitation / supervision of ionization current Burner lock Continuous pump run Boiler temperatu
PAGE 8
Basic diagram AC 230 V Lockout (SLT, LT) RAC 26 V Safety shutdown (GP) BV1 AC 230 V or RAC 230 V BV2 Ignition module integrated RAC 26 V Room thermostat or time switch Ignition module AC 230 V RAC 26 V Heating circuit pressure switch PWM / hall RAC 26 V 4 Modulated PWM fan AC 230 V or DC 24 V 6 Stepper motor control (diverting valve) DHW flow switch or DHW thermostat RAC 26 V Programmable digital input (e.g.
PAGE 9
Dimensions Dimensions in mm LMU54… 8,9 45,5 0,5 51 86 180 94 59 19,5 7494m02/0604 ø3 24 35 ,5 (6x ) 97 180 LMU64… 67,5 66,5 8 38 188 140 10 212 200 7494m01/1000 188 200 2016 Siemens AG Building Technologies Division, Berliner Ring 23, D-76437 Rastatt Subject to change! Building Technologies Division 9/9 CC1N7494en 20.04.