7 Boiler Management Unit (BMU) 471 LMS... LMS… are digital Boiler Management Units (BMUs) for use in gas-fired appliances equipped with premixing burners. The LMS… and this Data Sheet are intended for use by OEMs which integrate the BMUs in their products. Use LMS are digital boiler management units (BMUs) for use with gas-fired appliances equipped with premix burners.
LMS15 LMS14 Supplementary documentation Type (ASN) Description Documentation no. CC1E7471 LMS14 Boiler Management Unit CC1Q7471 CC1U7471 CC1E7471 LMS15 Boiler Management Unit Sitherm Pro CC1Q7471 CC1U7471 CC1U7472 Product range Product range overview Albatros² System Albatros system CE1P2359_08 Subschema Albatros2 Hydraulic subschema and extra functions CE1P2359_10 AGU2.550A109 Extension ClipIn for LMS CC1N7492 AGU2.551A109 Extension ClipIn for PWM (DC 0...10 V) CC1N7493 AGU2.
LMS15 LMS14 Type (ASN) Description Documentation no. QAD36/101 Contact temperature sensor NTC 10 k CC1Q1808 QAZ36.522/109 Immersion temperature sensor NTC 10 k CC1Q1843 QAZ36.526/109 Immersion temperature sensor NTC 10 k CC1Q1843 OCI345.06/101 LPB ClipIn CC1U2355_043 OCI351.
Standards and certificates Applied directives: ∂ Low-voltage directive ∂ Gas Appliances Regulation (EU) ∂ Electromagnetic compatibility EMC (immunity) *) 2014/35/EC (EU) 2016/426 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 DIN EN 298 appl
Technical Data LMS14 Basic unit General Mains voltage (rated voltage) Mains frequency Power consumption - Operation - Power pack Rated surge voltage category Degree of protection Safety class Degree of pollution Software classes - Controller part - Burner control Dimensions (L x W x D) Weight Unit fuse Mounting position AC 230 V 50 Hz to DIN EN 298 Max. 14 W Max.
Technical Data LMS14 (cont'd) Electrical connections Mains voltage connections Total current all mains components connected to LMS14 and clipins 5 A (at UMains = AC 230 V; Ta = 25 °C) Attention! Fuse protection! The following connecting terminals are protected by the unit fuse as per the chapter titled Technical data - General data. The cross sections of the connection lines must be designed according to the unit fuses.
Technical Data LMS14 (cont'd) Safety limit thermostat ∂ Voltage ∂ Current ∂ Cable length Fuel valve ∂ AC output ∂ Ε Current AC 230 V 5 mA...1 A, cosι >0.6 Carrying power to the fuel valve and ignition ′1 m AC 230 V +10%/-15% Valve must still open at AC 175 V 5 mA…0.5 A, cosι >0.
Technical Data LMS14 (cont'd) Supply voltage outputs, general data Extra-low voltage connections (PELV) Warning! For functional reasons, the LMS14 extra-low voltage circuits are connected to the protective earth via X17. Therefore, they are classed as PELV circuits.
Technical Data LMS14 (cont'd) Inputs B3/B38 DHW sensor B3/B38 (X5) ∂ Resistance value ∂ Cable length NTC 10 k ′10 m (when connecting a thermostat to the input for the DHW sensor, high-quality thermostat contact material is required (e.g.
Technical Data LMS14 (cont'd) Input H3 Multifunctional input/pressure sensor (X4) ∂ Output voltage LMS14 ∂ ∂ ∂ ∂ ∂ ∂ DC 15 V ±5% DC 5 V ±5% Imax. 10 mA DC 10 V Safety extra low-voltage DC 0…10 V >100 kς Current Input voltage LMS14 Analog input - Operating range - Input resistance Digital input Safety extra low-voltage for potential-free low-voltage contacts Voltage with open contact DC 15 V Voltage with closed contact DC 1.
Technical Data LMS14 (cont'd) Input H6 Multifunctional input/gas pressure switch (X5) ∂ Digital input ∂ Safety extra low-voltage for potential-free low-voltage contacts Voltage with contact open DC 5 V Voltage with contact closed DC 2 mA ∂ Cable length ′120 m Observe cross-sectional area of wires! (Refer to chapter Cross-sectional area sensors) Input H7 Multifunctional input/air pressure switch (X4) Digital input ∂ Safety extra low-voltage for potential-free low-voltage contacts Voltage with contact open DC
Technical Data LMS14 (cont'd) PWM pump connection P1 PWM pump connection (X15) ∂ PWM output - Safety extra low voltage Output voltage at Iout = 0 Output current (short-circuitproof) PWM frequency - Line length PWM output / 10 V output UX2 / UX3 PWM output / 10 V output UX2 / UX3 ∂ PWM output - Extra-low voltage Output voltage at Iout = 0 Output current (short-circuitproof) PWM frequency - Cable length ∂ 10 V output - Extra-low voltage Output voltage at Iout = 0 Output current (short-circuitproof) Calibr
Technical Data LMS14 (cont'd) BSB users BSB terminals (X7/X30/X50) ∂ Operator unit ∂ Room unit - Connection - Cable length ∂ - Cable resistance - Cross-sectional area of cable Users AVS37… QAA55/QAA75… 2- or 3-wire Max. 200 m at 1.5 mm² cross-sectional area of cable Max. 3 x 14 ς Min. 0.5 mm² Max. 5 (1 operator unit, 3 room units, 1 service unit) 13/32 Building Technologies CC1N7471en 27.03.
Technical Data LMS14 (cont'd) Limitation of the BSB users The LMS14 may only be subjected to a maximum load of 40 mA on the BSB ports (CL+/CL-) and a maximum load of 400 mA on the 12 V supply. Danger! These maximum currents must not be exceeded by the total number of bus users combined. To avoid uncontrollable malfunctions on the LMS14, each system must be checked accordingly. Current rating on BSB connections (CL+/CL-) in mA * Current rating on 12 Vsupply in mA * AVS37.294 AVS77.314 0.2 22 AVS37.
Current rating on BSB connections (CL+/CL-) in mA * Current rating on 12 Vsupply in mA * AVS75.390 0.2 0 AVS75.370 0.2 0 AGU2.550 0.2 80 OZW672 0.2 0 OCI700 OCI611 0.2 0 AVS71.410 (RF gateway) 0.2 22 AVS71.393 0.2 10 Devices Remark Auxiliary modules: Others: * The values shown refer to the status as of July 2015 and may have to be checked.
Technical Data AGU2.56xx109 General device data Degree of protection Safety class Pollution degree Dimensions Weight Mounting position Lifetime Electrical data IP20 Safety class III 2 60 x 20 x 12 mm (L x W x H) Approx. 16 g Optional Max. 300 h Power supply DC 5 V ±5% Warning! Only use the parameter stick during the parameter setting process on the LMS14.
Technical Data LMS15 Ε Basic unit Note! The data listed are only those deviating from the Technical Data of the LMS14 Mains voltage (rated voltage) Mains frequency Power consumption ∂ Operation ∂ Power pack Rated surge voltage category Degree of protection Safety class Degree of pollution Software classes ∂ Controller part ∂ Burner control Dimensions (L x W x D) Weight Unit fuse Mounting position AC 230 V 50 Hz to DIN EN 298 Max.
Technical Data LMS15 (cont'd) Electrical connections Total current for all network components connected to the LMS15 and clip-ins Mains voltage connections 5 A (at UMains = AC 230 V; Ta = 25 °C) Attention! Fuse protection! The mains voltage connection terminals are protected by the unit fuse as per the chapter Technical data - General data.
Technical Data LMS15 (cont'd) OpenTherm OpenTherm connection ∂ ∂ Connection Cable length ∂ ∂ ∂ ∂ Cable resistance Wire cross section User Open-circuit voltage According to OpenTherm specification V4.0 2-wire Max. 50 m with a 1 mm² wire cross section Max. 2 x 5 ς Min. 0.5 mm² Max. 1 per connection Max. 24 V DC 19/32 Building Technologies CC1N7471en 27.03.
Functions Heating circuit control ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ Different operating modes (protection mode, automatic operation, reduced mode, comfort mode) Different compensation variants (e.g.
Functions (cont'd) Primary controller/system pump ∂ ∂ ∂ Limitations of the flow temperature setpoint Mixing valve control Plant hydraulics Boiler ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ Setpoint adjustment Setpoint manual control Frost protection for the boiler PID control algorithm Boiler/burner control Overtemperature protection Minimum limitation of boiler temperature Minimum limitation of return temperature Boiler pump control Electronic temperature controller Limitation of boiler tempera
Functions (cont'd) Special operating modes ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ Chimney sweep function Setting the burner capacities Setpoint manual control Controller stop function Setting the controller stop setpoint Deaeration function Setting the type of venting Telephone function for customer service Solar ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ dT-control for DHW storage, buffer storage Minimum and maximum charging temperature Minimum running time Pump kick and valve kick Status display (operating state) Overtemp
Functions (cont'd) DHW storage tank ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ Setting the sensors DHW charging with one sensor DHW charging with 2 sensors DHW charging with thermostat DHW release Charging control Limitation of charging time DHW charging with charging pump/diverting valve Discharging protection Overtemperature protection Frost protection for the DHW storage tank Recooling Electric immersion heater DHW push Excess heat draw Setting the plant hydraulics Speed-controlled pump Heat transfer Settin
Functions (cont'd) Faults ∂ ∂ ∂ Error message functions Error acknowledgement Fault history Maintenance/special mode ∂ ∂ Maintenance functions Mains voltage supervision/mains frequency supervision Parameter stick ∂ ∂ Setting the parameter Data transfer Input/output test ∂ ∂ ∂ Output test for relay Input test for sensor Input test for inputs Hx / Ex General ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ Status message Cascade diagnostics Heat source diagnostics Consumer diagnostics Chimney drying Display lists Lockout/
Basic diagram LMS14 L1, N, PE / L1, L2, PE (L1 / N replaceable) Fuel valve AC 230 V Mains voltage (S)TB / TB (Safety)Temperature limiter, Temperature limiter) Ignition module AC 230 V Lockout Lockout reset button Variable speed PWM fan AC 230 V H1 Programmable analog / digital input Multifunctional output QX1 H3 Programmable analog / digital input Heating circuit pump QX2 H4 Programmable frequenzy / digital input Analog output P1 H5 Programmable digital input Analog output UX2 H6
Basic diagram LMS15 L1, N, PE / L1, L2, PE (L1 / N replaceable) Mains voltage (S)TB / TB Safety temperature limiter, temperature limiter Reset Lockout reset button H1 Programmable analog / digital input H3 Programmable analog / digital input H4 Programmable frequenzy / digital input RT / H5 Fuel valve DC 24 V Stepper motor fuel valve Ignition module DC 24 V PWM fan AC 230 V Programmable digital input H6 Gas pressure switch or programmable digital input H7 Air pressure switch or programmabl
Dimensions Dimensions in mm LMS14… complete (Basic) 150 140 108,5 93,8 5 Ø 4, 2 (7 x) 71 146,5 5 8,6 51,8 60,5 82,7 117 129 150,7 220 230 83 21 66 5 112,1 139 17,2 7471m27/0514 140 27/32 Building Technologies CC1N7471en 27.03.
Dimensions (cont'd) Dimensions mm LMS14… complete (Medium) 150 140 139,4 131,5 108,5 95,2 71 Ø4 ,2 5 54 (7 x 9,33 ) 93,8 183,2 195,65 221,4 220 230 214,5 83 112,1 146,5 46 5 7,8 8,6 31,3 21 51,8 60,5 82,7 117 129 124,5 150,7 179,5 169,5 9,9 66 5 99 128,7 133 139 20,4 7471m26/0514 140 28/32 Building Technologies CC1N7471en 27.03.
Dimensions (cont'd) Dimensions in mm 7471m25/0514 LMS14… complete (Deluxe) 150 140 135,2 131,5 108,5 93,8 71 Ø4 5 54 ,2 (7x 9,3 ) 139 169,5 146,5 150,7 179,2 210 183,2 195,65 217,2 220 230 112,1 5 7,8 26,75 31,3 51,8 60,5 82,7 117 124,5 129 133 9,9 64 66 5 128,7 21,6 142,2 29/32 Building Technologies CC1N7471en 27.03.
Dimensions (cont'd) Dimensions in mm LMS15… complete (Basic) 150 140 O 108,5 4, 2 (7 93,8 x) 71 5 5 8,6 26 20 51,8 82,7 117 129 146,5 150,7 230 220 83 66 7471m07/0409 5 Nullpunkt 112,1 139,6 17,3 140 30/32 Building Technologies CC1N7471en 27.03.
Dimensions (cont'd) Dimensions in mm LMS15… complete (Medium) 150 140 139,4 108,5 95,2 O 4,2 71 (7x 5 54 ) 9,3 221,4 220 230 93,8 146,5 51,8 56,8 5 8,6 20 26 76,5 82,7 117 128,7 124,5 150,7 179,5 169,5 183,2 195,7 220,6 209,5 112,1 46 66 99 5 17,3 139,6 140,7 140 9,8 21 Nullpunkt 7471m08/0409 31/32 Building Technologies CC1N7471en 27.03.
Dimensions (cont'd) Dimensions in mm LMS15… complete (Deluxe) 150 O 108,5 95,2 2 4, x) (7 71 5 54 93,8 169,5 183,2 195,7 217,2 230 220,6 209,5 220 83 117 5 26 20 26,7 56,8 76,5 124,5 129 146,5 150,7 179,5 112,1 9,8 64 66 5 Nullpunkt 7471m09/0409 21,6 139,6 140,7 140 32/32 Building Technologies 2018 Siemens AG Building Technologies, Berliner Ring 23, D-76437 Rastatt Subject to change! CC1N7471en 27.03.
