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Siemens LMU54 Series Basic Documentation

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

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Summary of Contents for Siemens LMU54 Series

  • Page 1 LMU54... / LMU64... Boiler Management Unit (BMU) Basic Documentation Software version 2. 08 Siemens Building Technologies CC1P7494en HVAC Products 07.11.2002...
  • Page 2 • 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 ) •...

  • Page 3: Table Of Contents

    Fan parameters accessible via QAA ...........25 − The different capacity ranges .............26 − Setting the fan parameters during startup and shutdown....27 − Speed readjustment ..............28 Selection of the compensation variants ..........30 3/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 4 Summer / winter (S / W) changeover..........59 Electronically controlled PWM heating circuit pump......... 61 − General..................61 − Introduction ................61 − Notes ..................61 4/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 5 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 5/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 6 DHW temperature control............. 94 − Compensation variants ............. 94 − Position of diverting valve ............95 − Storage tank systems ............... 95 − Stratification storage tank ............96 6/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 7 Connecting cable between OCI490... and PC........118 9.10 Mounting, electrical installation and service .......... 119 − Mounting (general) ..............119 − Mounting the LMU5x............... 119 7/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 8 Burner control identification ............. 140 − Operating data ..............140 − MCI..................140 − LPB ..................140 12.2 Lockout position storage..............141 − Phase designations / numbers ............ 141 8/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...
  • Page 9 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 9/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products Contents 07.11.2002...

  • Page 10: Overview

    Building automation / AGU2.310... remote management OCI420 AGU2.500 AGU2.51x OCI / ACS RVA63... RVA65... RVA66... Service tool 0...10 V Clip-in 4...20 mA 7494b01E/0702 Auxiliary modules 10/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 1 Overview 07.11.2002...

  • Page 11: Features

    • AGU2.51x clip-in function module - inputs: NTC, 10 kΩ digital input 0(4)...20 mA DC 0...10 V - outputs: max. 3 relays AC 230 V 11/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 1 Overview 07.11.2002...

  • Page 12: Dhw

    • Counter for the number of startups and the number of operating hours • Maintenance functions with service message • Automatic plant configuration (identification of RU, connected HMI, sensors, etc.) Planned; on request 12/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 1 Overview...

  • Page 13: Parameterization

    • Capacity ranges < 70 kW, 70...120 kW, or > 120 kW • Heating boilers or combi boilers with DHW storage tanks or instantaneous DHW heaters 13/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 1 Overview...

  • Page 14: Notes On Product Liability

    Disposal notes 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! 14/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 1 Overview...

  • Page 15: Product Range Overview

    PC interface for ACS42X. .. ACS420 Software for OCI490A109 ACS421 Final production test software Remote supervision ACS... Operating software CE1B2530 OCI6... Central communication unit CE1N2530 / 2531 15/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 2 Product range overview 07.11.2002...
  • Page 16 AGU2.103A109 Connecting cable service interface AGU2.361 Ö QAA73... 1) 2) AGU2.104A109 Connecting cable LMU... Ö Clip-in module AGU2.500 / OCI420 Refer to Operating Instructions CC1B7494 On request 16/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 2 Product range overview 07.11.2002...

  • Page 17: Functions

    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. 17/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 18: Sequence Diagram

    Logic off -> Home run phase Triggering forced prepurging On deviation Prohibited range Repetition can be parameterized, Control transition to home run -> Lockout then lockout 18/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 19: Capacity Range > 120 Kw

    With regard to the speed feedback signal, the following nominal levels are used: N_Vor, N_VL, N_ZL, N_TL Prepurging Nominal load Ignition load Partial load Previously «Full load» (VL) 19/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 20: Sequence Times

    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. « 20/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 21 0 but only to a minimum of 0.2 seconds. • PH_TI; (ti), interval required for stabilization of the flame • PH_MODULATION; (unlimited), controller operation. In this phase, the controller result is output 21/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 22: Shutdown

    «PH_STANDBY» phase. The timer for forced intermittent operation is reset in the «PH_STANDBY» phase. Quick startup with forced intermittent operation is not possible. 22/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...
  • Page 23 As long as the setpoint is lower than the threshold value, the fan will not be controlled. It is controlled only - using the threshold value - when the setpoint is at least equal to the threshold value. 23/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 24: Lmu

    The fan’s speed feedback signal can be parameterized. speed feedback signal Parameter: Fan pulses (in «FaEinstellFlags3») Available choices: 2, 3 or 4 pulses per revolution 24/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 25: Fan Parameters Accessible Via Qaa

    When, in the following, reference is made to one of the safety-related parameters, it is also possible that the corresponding QAA parameter is meant (depending on the parameterization). 25/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 26: The Different Capacity Ranges

    » « » With the LMU...: Loss of flame during phases PH_TI PH_MODULATION Accomplished by parameterizing the specified value for the start repetitions to 0 26/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 27: Setting The Fan Parameters During Startup And Shutdown

    (see above). Faults outside these worst cases give rise to a violation of the speed limits and lead to appropriate reactions (refer to sequence diagram). 27/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 28: Speed Readjustment

    This means that the settling process will be accelerated. The learning function can be deactivated with flag «N_Nachstell_lern» (in «FaEinstellFlags2»). 28/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...
  • Page 29 If a small value is parameterized (e.g. 1), ignition is effected immediately. The greater the value, the less overshoot is permitted on ignition. It should be noted that greater values extend the startup phase. 29/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 30: Selection Of The Compensation Variants

    Time switch program on the AGU2.310 for heating circuit 1 RU1 / V Heat demand from RU for heating circuit 1/ heating circuit 2 – Will not be evaluated 30/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 31 Tset / Tset2 present SU prog. HMI Hz1 control sation RU Weather compen- Weather compen- Present Present TvSollWf1 Tset / Tset2 sation LMU sation RU 31/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 32: Room Setpoint

    (TrSmin+TrSmax) / 2 present Present Present TrSollMmi (TrSmin+TrSmax) / 2 Present TrSet (TrSmin+TrSmax) / 2 present Present Present TrSet TrSollMmi Present Don’t care TrSet (TrSmin+TrSmax) / 2 32/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 33 Present Present (TrSmin+TrSmax) / 2 SU program Hz1 Present TrSet (TrSmin+TrSmax) / 2 present Present Present TrSet TrSollMmi Present Don’t care TrSet (TrSmin+TrSmax) / 2 33/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 34: Configuration Of The Heating Circuits

    RU, Hz2 by the secondary heating circuit of the RU, if RU is present Hz1 and Hz2 are controlled by the secondary heating circuit of the RU, if RU is present 34/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 35: Dhw Circuit

    (DHW heated by RVA) Present and DHW Present Not present TbwSollRva RVA-DHW RVA-compensated released 1) Present and DHW Present Present TbwSollRva RVA-DHW RVA-compensated released 1) 35/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 36 It is to be connected to the RU input. This function cannot be used in connection with a RU 3) Can be selected via parameterization «KonfigRg6.2» 36/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 37: Acquisition Of Actual Values

    DHW temperature 1 / 2 0...100 °C -5...125 °C Outside temperature -35...+35 °C -50...+50 °C Flue gas temperature type A and B 0...125 °C -5...150 °C 37/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 38: Display Of Ionization Current

    QAA73... can only read. The time required for updating is about 3 seconds. 2. Via the PC tool. 3. Via the HMI (AGU2.303..., AGU2.310... or AGU2.361...) 38/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 39: Supervisory Functions

    TaBegr SdHzEin Boiler output = Pmin...Pmax Pmin Pmin...Pmax Pmin P = 0 P = 0 Pmin...Pmax ZAueRuec Time Flue gas temperature supervision with the LMU... 39/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 40: Electronic (S)Lt

    Handling faults The table below contains the faults that can occur. It also shows the related measures, that is, whether start prevention or immediate lockout shall be triggered. 40/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 41 If the (S)LT’s cutout temperature is reached, the fan will also be activated. Both are active until the relevant trigger criterion is no longer present, the maximum time being «ZGebNach» (parameter). 41/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 42: Flow Switch / Water Pressure Supervision

    (KonfigRg5). In any case, the pump will be deactivated to prevent dry run. Note Only one of the 3 devices (flow switch, pressure switch or pressure sensor) can be used for supervision. Combinations are not possible. 42/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 43: Static Supervision

    To ensure that short-time crossings of the water pressure thresholds do not immediately give rise to a response, the acquired water pressure will be filtered (τ ≈ 2 seconds). 43/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 44: Dynamic Supervision

    ∆ P dpH2OminPuOn (e.g. 0.4 bar) Pump off Pump on Pump off T1+8 s Time Dynamic water pressure supervision of the LMU... 44/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 45: Load Limitation

    (PhzMax – LmodTL) + LmodTL 100 % RelModLevSet: The relative modulation level setting specifies the maximum degree of modulation of the RU in % of the modulating range. 45/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 46 Maximum output in DHW mode: LmodTL ≤ PhzMax ≤ LmodVL Maximum output in heating mode: Maximum output in heating mode LmodTL ≤ PhzMaxAkt ≤ PhzMax and RU connected: 46/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 47 With regard to heat demand, the following thus applies to the output or speed range: Demand for space Demand for DHW heating heating Minimum output N_TL N_TL Maximum output NhzMaxAkt N_VL 47/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 48: Speed Limitation

    If the ionization current exceeds the limit, the speed limit is reduced again by 100 min every 10 seconds until the speed limit has reached the minimum speed (N_TL). 48/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 49: Boiler Control

    Output ZReglVerz Ignition LmodRgVerz 7494d06aE Beginning Ignition Start of Start of modulation of startup (release of controller by the load controller fuel valves) delay time 49/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 50: Controller Delay Due To Slt Criterion

    DHW storage tank Instantaneous DHW charging heating Controller parameters KpHz1, TnHz1, TvHz1 KpBw, TnBw, TvBw KpBw, TnBw, TvBw Kp, Tn, Tv Sampling time ZabtastK ZabtastK ZabtastDlh 50/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 51: Heat Output Limits

    Function Required heat output Chimney sweep function PhzMaxAkt Controller stop function Set on the HMI or QAA73... Controller delay LmodRgVerz 51/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 52: Boiler Temperature Control

    Boiler cycling protection is accomplished with different methods, depending on the Boiler cycling protection operating mode. Heating DHW storage tank Instantaneous mode DHW heater Dynamic switch-off differential Minimum boiler pause = outlet temperature control 52/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 53: Dynamic Switch-Off Differential

    Notes A minimum switching differential of +2 K (SdAusMin, SdEin) must be observed. The dynamic switch-off differential only works with positive values of SdAusMin and SdAusMax! 53/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 54: Modulating Control, Conventional

    It is also possible to set the sampling time for the boiler circuit and the DHW circuit. The heat output determined by the PID controller is limited to the permissible output range. 54/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 55: Hydraulic System Management (Hsm)

    • If, before, the outside temperature was higher, the pumps will cycle in that range • If, before, the outside temperature was lower, the pumps will remain activated in that range 55/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 56: Consumer Management (Cm)

    Demands for heat of the same priority can be satisfied at the same time (if not excluded by the hydraulic system). Subordinate priorities will be locked and must wait until the higher priority is satisfied. 56/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 57: Determining The Temperature Demand

    TkSmax TkSoll Correlation between 2-position control and temperature limiter As the graph shows, the following conditions must be satisfied: TkMax < Tstb TkSmax < TkMax 57/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 58: Temperature Limitation

    Heating circuit 1 can only be operated as a pump circuit. For this reason, limitation is made for the range permitted for the pump circuit. TkSmin ≤ temperature demand HC1 ≤ TkSnorm Limitation HC1: Exception: → Warm air curtain function 58/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 59: Summer / Winter (S / W) Changeover

    LMU HC(s) HC(s) zone Summer Summer Locked Locked Locked Winter Summer Locked Locked Locked Summer Winter Locked Released Released Winter Winter Released Released Released 59/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...
  • Page 60 ≥ & DHW demand Resulting heat demand of CM Note A description of summer / winter changeover with the AGU2.310... is given in CC1B7494. 60/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 61: Electronically Controlled Pwm Heating Circuit Pump

    Since in the case of weather compensation, the heating curve defines the flow temperature for a maximum volumetric flow, ∆T control should be based on that setting. 61/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 62: First Stage Maximum Limitation Of The Flow Temperature

    Condensing boilers with no return temperature sensor to increase the efficiency of Application condensation and when there are limitations with regard to the heat exchanger’s maximum ∆T. There should be no bypass, if possible. 62/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 63: Third Stage ∆T Supervision

    • Automatic maximum operation should the control line become faulty H-Q chart FoerderMax (= 5.9) (example) Speed = QmodDrehzStufen FoerderMin (= 0.6) Q [m / H] Speed = 1 H-Q chart of PWM pump 63/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 64: Adaption Of Modulating Pump To The Heating Plant

    (ZAbtastK). The default value of «KtAbtastDt » is 10. If this parameter is changed, the controller parameters must be adapted also. 64/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 65: Activation Of Pwm Pump Via A Configuration Byte

    XX1X XXXX: In reduced operation (night setback), the selected ∆T supervision is active, depending on the activated stage Not relevant for ∆T supervision. Bit 6 and Bit 7 65/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 66: Parameters Of The Pwm Pump (Installer)

    20. dTkTrMax Setting to be made if required. Maximum differential or ∆T between flow and return that shall be maintained by the ∆T supervision. 66/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 67: Pid Controller Coefficients Of Delta-T Supervision

    1,0: medium Bit 4 ∆T in reduced operation. Bit 5 Installer 0: inactive; 1: active Bit 6 Not relevant Installer Bit 7 Not relevant Installer 67/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 68: Behavior In Different Operating Modes

    (night setback) or after plant shutdown (night shutdown). Then, a change to the volumetric flow is made that was calculated according to the current outside temperature. 68/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 69: Dhw Operation

    Emergency operation, fixed Room influence RU, value control, weather weather compensation RU compensation LMU... TkSnorm MaxTSet Compensation variant HC1 (setting parameter of LMU…) (setting of RU) 69/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 70: Heating Circuit Control

    It acts indirectly on the flow temperature control via the composite outside temperature. TiAussen Example °C TaGed 18:00 06:00 18:00 06:00 18:00 TiAussen Actual outside temperature TaGed Attenuated outside temperature 70/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 71: Composite Outside Temperature

    Houses or buildings with thick walls or walls with Type of building construction outside insulation • Light building construction: Houses or buildings with thinner walls or light brickwork 71/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 72: Heating Curves

    Heating curves Heating curves (standard Siemens), TrSoll = 20 °C Sth=20 Sth=10 Sth=2 Composite outside temperature TaGem Heating curves of LMU...-internal weather compensation (impact of slope) TvSoll: Flow temperature Legend TaGem: Composite outside temperature Sth: Heating curve slope (parameter) The heating curve describes radiator systems with a radiator exponent of n =1.3 at a room temperature setpoint of 20 °C.

  • Page 73: Generating The Demands For Heat

    S / W changeover on HMI Quick setback If certain plant components are not present (e.g. no S / W changeover), the input will enable the demand for heat. 73/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions...

  • Page 74: Time Switch

    SU = 1 With this variant, the demand for heat is generated based on S / W changeover, heating limit switch and quick setback. 74/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 75: Room Thermostat

    Demand for heat locked RU1 = 1: Demand for heat released Heating circuit 2 RU2 = 0: Demand for heat locked RU2 = 1: Demand for heat released 75/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 76: Combinations Of Ru And Room Thermostat / Time Switch

    If this parameter = 0, room thermostat 1 / 2 is used If, with the AGU2.310, time switch operation is parameterized, the contact will not be evaluated and replaced by the switching program of the operating section 76/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 77: Eco Functions

    Automatic 24-hour heating limit TaGem Composite outside temperature Room temperature setpoint During the time the automatic 24-hour heating limit is active, the heating will Effect automatically be off. 77/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 78: Quick Setback Constant (Kon)

    LMU… are not relevant! For detailed information on the assignment of setpoints, refer to «Compensation variants heating circuits». 78/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 3 Functions 07.11.2002...

  • Page 79: Clip-In Agu2.500

    Note The read-in tolerance is the worst-case device accuracy excluding the sensor tolerance. Refer to «Connection diagrams». Inputs / outputs 79/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 4 Clip-in AGU2.500... for additional heating circuit 07.11.2002...

  • Page 80: Interfaces For The Lmu

    PI mode. The flow temperature is controlled to the setpoint of the determined flow temperature plus the boost. 80/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 4 Clip-in AGU2.500... for additional heating circuit...

  • Page 81: Pump Control

    In the test, the mixing valve is first driven toward the fully open position (8 seconds) and then toward the fully closed position (10 seconds). Then, the output is used for the control of the pump (10 seconds). 81/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 4 Clip-in AGU2.500...

  • Page 82: Clip-In Module Oci420

    (setpoints, time switch programs, etc.). For the operation of external heating circuits, an appropriate hydraulic diagram must be selected on the LMU… Suitable choices are diagram 64 through 76. 82/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420...

  • Page 83: Automatic Changeover Of Operating Mode

    Provision of external DHW heating by ALBATROS controllers means that an adequate hydraulic diagram must have been selected on the LMU..Suitable choices are diagram 64 through 76. 83/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420...

  • Page 84: Type Of Priority Of Dhw Heating

    − Calibration of actual output of BMU 1...4 (lines 25 through 28). This value is to be set directly on the respective unit (parameter 440, calibration factor) 84/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420... for communication via LPB...

  • Page 85: Separate Dhw Circuit In Cascade Applications

    For this reason, there is no difference to cascade applications as far as the BMU is concerned. A separate DHW circuit is also supported with this type of application, provided the LMU… has been configured to device address 2! 85/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420...

  • Page 86: System Functions

    In connection with the communication interface OCI6... and high-priority error messages, alarms can be sent to remote operating stations, ensuring remote supervision of heating plant. 86/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420... for communication via LPB...
  • Page 87 = 1 A faster response of the entire system can be obtained by cutting the power supply for a short moment 87/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420... for communication via LPB...

  • Page 88: Outside Sensor, Outside Temperature Sensor

    Units located at the same place of application can be combined in one segment . The segment address has a setting range from 0 to 14 and must be set to 0 for the LMU..., independent of the type of application! 88/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 5 Clip-in module OCI420...

  • Page 89: Clip-In Function Module Agu2.51X

    3 outputs can be handled. If, in addition to the clip-in function module, an LPB clip-in module is used, only outputs 1 and 2 of the clip-in function module can be handled. 89/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 6 Clip-in function module AGU2.51x...

  • Page 90: Inputs

    Parameter «TAnfoExtMax» U (V) S = 5 °C! I (mA) 7494d42/0702 130 Temp. (°C) Predefined setpoint 90/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 6 Clip-in function module AGU2.51x 07.11.2002...

  • Page 91: Predefined Output

    If no boiler return sensor is connected, an error code will be delivered. If the state of the boiler return sensor changes from “Present” to “Faulty”, the actual boiler temperature will be maintained again and an error code delivered..91/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 6 Clip-in function module AGU2.51x...
  • Page 92 This state is maintained until the boiler return temperature returns below the temperature level after the pressureless header. In other words, the boiler is always controlled to the higher of the 2 temperatures. 92/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 6 Clip-in function module AGU2.51x...

  • Page 93: Dhw Control (Bwr)

    Limitation to «TkSmax» and reduction of boost. Limitation of the DHW temperature setpoint. This means that the storage tank’s charging time becomes longer. It is possible that only a lower DHW temperature setpoint will be reached. 93/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 94: Dhw Temperature Control

    50 °C TbwSmin 7494d17E/0201 TbwSmin TbwSmax TbwSoll Boiler temperature setpoint during storage tank charging TbwSmin: Minimum DHW temperature setpoint TbwSmax: Maximum DHW temperature setpoint 94/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 95: Position Of Diverting Valve

    + TuebBw). The output demand on the burner is controlled between «LmodTL» and «LmodVL» or, in the case of an active speed limitation, between «N_TL» and «N_VL». 95/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 96: Stratification Storage Tank

    LMU... basic unit. Plant diagram Heating circuit 1 9, 41, 43, 57, 59, 73, 75 Multispeed 10, 42, 58, 74, 83 Multispeed or modulating 96/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...
  • Page 97 «Reduced» to «Nominal level» on the same day, there will be no more forward shifts. After the first forward shift: FreigabeDurchladung = 0 This gives rise to the release of the stratification storage tank’s recharging. 97/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)
  • Page 98 The boiler temperature setpoint is determined by boiler temperature setpoint = BwSollwert + boost, whereby the minimum limitation is boiler temperature setpoint = 50 °C + TuebBw. 98/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)
  • Page 99 «N_TL» and «N_VL». If, during active recharging, the release criterion for recharging becomes obsolete, the demand for DHW will be stopped based on the criteria of full charging. 99/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 100: Instantaneous Dhw System

    • After outlet temperature control, comfort control will be activated for a certain period of DHW demand time: - Without additional heat demand: Time «Z_BwComfort1» - With additional heat demand: Time «Z_BwComfort2» 100/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...
  • Page 101 - If «B2 < TqNach»: For the fixed time of one minute Heat demand 7494d28E/0102 FS-DHW T_set_DHW TbwBereit Z_BwComfort1 Z_BwComfort1 Z_BwComfort2 Z_BwComfort2 Z_BwComfort2 101/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...
  • Page 102 The above graph applies to «Z_BwComfort1» and «Z_BwComfort2». If «ZqComfortAus» is parameterized longer than the longest time of «Z_BwComfort1» and «Z_BwComfort2», the pump will run as long as comfort mode is active. 102/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 103: Aqua-Booster System

    − In addition - as an option - an external DHW flow switch can be used to generate a demand (parameter «KonfigRg8») 103/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)

  • Page 104: Legionella Function

    Legionella function The LMU... does not provide legionella protection. That function is implemented in connection with the QAA73... for example. 104/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 105: Special Functions

    AGU2.310 AGU2.303 AGU2.361 ACS420 Choices and channels for parameterizing the BMU Via PC tool ACS420 Users Siemens, OEM, for use in laboratories and OCI490... Features Changing individual parameters and a parameter set Parameter types Safety-related and non-safety-related parameters Parameter levels Connection OCI490...

  • Page 106: Via Agu2.361 / Agu2.303

    • The warm air curtain function is active when the contact is closed • PWM pump control will not be affected The limitation of HC1 is provided according to «TkSmin ≤ temperature demand HC1 ≤ TkSmax». 106/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)

  • Page 107: Programmable Output Of The Lmu

    Output is set when there is a fault on the unit that calls for a manual lockout reset (nonvolatile lockout). Operational status signal Output is set when the burner is in operation. 107/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)

  • Page 108: Switching Off The External Transformer

    DHW stratification storage tank is activated. This means that the function can only be activated when using hydraulic diagrams that include stratification storage tanks. Otherwise, the output remains reset. 108/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR) 07.11.2002...

  • Page 109: Actuating Device When Analog Signal Exceeds Threshold

    2 clip-in modules (e.g. AGU2.500 / OCI420) An additional external transformer is required only when using a DC 24 V fan or for stepper motor control. 109/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 7 DHW control (BWR)

  • Page 110: Basic Diagram

    (continuously) The diagram shows the maximum functionality of the LMU... system. For the specific scope of functions, refer to the relevant version / configuration ! 110/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 8 Basic diagram...

  • Page 111: Connection Diagrams

    Connection diagrams 9.1 LMU... 111/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 112: Dhw Stepper Motor (Bipolar)

    Wire to be cut off Peripheral core marking Pin1 Pin1 7494a04E/1002 6-core ribbon cable spacing 2.5 mm, AWG 24, grey Connector: Lumberg type Duomodul 3515 05 K04 112/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 113: Agu2.500A109

    02-K14 02-K32 03-K10 Lumberg designation (3611...) X52-01 X52-02 X52-03 Siemens designation 02-P Standard short-form designation 02-K15 Lumberg designation (3611...) X51-01 Siemens designation 7494a05E/0102 Flow sensor 113/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 114: Agu2.500A209

    02-K14 02-K32 03-K10 Lumberg designation (3611...) X52-01 X52-02 X52-03 Siemens designation 02-P Standard short-form designation 02-K15 Lumberg designation (3611...) X51-01 Siemens designation 7494a09E/0702 Flow sensor 114/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 115: Oci420A109

    Status indication Service tool 02-K Standard short-form designation 02-K10 Lumberg designation (3611...) X41-01 Siemens designation 7494a06E/0702 Data bus (LPB) MB Ground bus (LPB) 115/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 116: Oci420A209

    X40 Status indication Service tool 02-K Standard short-form designation 02-K10 Lumberg designation (3611...) X41-01 Siemens designation 7494a10E/0702 Data bus (LPB) Ground bus (LPB) 116/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 117: Agu2.51X

    X52-03 Siemens designation 02-P Standard short-form designation 02-K15 Lumberg designation (3611...) X51-01 Siemens designation 7494a12E/0702 Observe polarity of input with: AGU2 .511A109 Input AGU2.513A109 117/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 9 Connection diagrams 07.11.2002...

  • Page 118: Connecting Cable Between Oci490

    9.9 Connecting cable between OCI490... and PC The connecting cable to be used is a 9-polar serial interface cable with a 1-to-1 connection (crossed connections not permitted)! Note The cable is not supplied by Siemens. 118/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64...

  • Page 119: Mounting, Electrical Installation And Service

    Ensure protection against electric shock hazard on unused AC 230 V connection terminals (RAST5) by fitting dummy plugs! To isolate the unit from the mains network, use a multipolar switch. For wiring the bus users, only the cables specified by Siemens may be used! 119/171 Siemens Building Technologies Basic Documentation LMU54...

  • Page 120: Testing By The Customer

    Connection of functional earth to X1-3 must be made in compliance with regulations ! Testing by the customer If the boiler or burner manufacturer wants to conduct additional insulation or high- voltage tests, they can only be made after prior approval by Siemens ! 120/171 Siemens Building Technologies Basic Documentation LMU54...

  • Page 121: Technical Data

    - Flame protection class to UL 94: V-2 Unit fuse (to IEC 127) T6.3 H 250 Identification code (to EN 298) F M C L B N 121/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 10 Technical data 07.11.2002...

  • Page 122: Electrical Connection Data

    Note If a fuel valve with rectifier shall be connected to the fuel valve AC output, it can only be made with the approval of Siemens! In that case, additional protective measures inside the LMU... will be required (optional electronic components).
  • Page 123 AC 175 V - Max. cable length With regard to switch-on and switch-off characteristics, every type of external ignition module used must be approved by Siemens ! • Integrated ignition module (X3-04) - Min. sparking power / pulse 3 mJ at 2 kΩ...
  • Page 124 12 kΩ ≤ 3 m - Cable length • Pressure sensor (X11) - Huba Control, type 502 0 ... 4 bar - Imit on request 124/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 10 Technical data 07.11.2002...
  • Page 125 - Max. output Voltage LMU… DC 41 V at 122 mA ≤ 1 m - Cable length Note: The currents specified are average motor currents 125/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 10 Technical data 07.11.2002...

  • Page 126: Cable Lengths (Lmu

    Quick connector 2.8 x 0.8 mm the LMU... * Connector to be fitted to the component (to be provided by OEM) Recommended cross-sectional area of cable for X11...X15: 0.38 mm 126/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 10 Technical data...

  • Page 127: Clip-In

    1) Contact rating: Nom. DC 34 V / 5 mA Note The inputs may only be used with safety extra low-voltage (SELV) and may not be connected to protective earth (PE)! 127/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 10 Technical data...

  • Page 128: External Components

    Connectors with screw terminals e.g. Lumberg type 3611 (suitable stranded wires 2.5 mm • Safety transformer to EN 61 558-2-6 Mains transformer refer to separate Siemens specification_LMU5x_transformer and fan_de_VX.Y.doc specification (mandatory) • Rated data Fan with DC 24 V motor refer to separate Siemens specification_LMU5x_transformer and fan_de_VX.Y.doc...

  • Page 129: Dimensions

    11 Dimensions 11.1 LMU5x... Dimensions in mm 45,5 129/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 130: Lmu6X

    11.2 LMU6x... Dimensions in mm 67,5 66,5 7494m01/1000 130/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 131: Agu2.500A109 / Agu2.51Xa109

    11.3 AGU2.500A109 / AGU2.51xA109 Dimensions in mm 7494m17/0801 15,35 131/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 132: Agu2.500A209

    11.4 AGU2.500A209 Dimensions in mm 7494m20 41,35 132/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 133: Oci420A109

    11.5 OCI420A109 Dimensions in mm 7494m18/0801 15,35 133/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 134: Oci420A209

    11.6 OCI420A209 Dimensions in mm 13,75 7494m21 41,35 134/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 135: Mounting Plate For Clip-In Module

    11.7 Mounting plate for clip-in module Dimensions in mm min. 9.2 Openings for mounting 7494m19E/0102 24.9 min. 3.4 51.8 Material thickness Distance between in these areas 2 modules 135/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 11 Dimensions 07.11.2002...

  • Page 136: Parameter List / Legend Of Parameter Bit Fields Lmu

    5 ... 130 °C Engineer Installer (5 °C< = TAnfoExtMax< = 130 °C) 7494t01E_Param_List.xls * Read only 136/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 137: Switching Differentials

    -128 ... 127 match effective output (production) 470 KonfigEingang Boiler Progr input LMU basis 0 ... 255 Engineer Installer 137/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 138: Controller Times

    Max pressure differential that can occur when pump is 480 dpH2OmaxPuOn 0 ... 5 bar Engineer Installer supervision switched on 138/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 139: Burner Control Fan

    Limit value for limiting the ionization current. 476 IonLimit Boiler 0 ... 25 µA OEM Service 0 = function inactive 139/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 140: Burner Control Identification

    415 LPBErrorGerAlarm Boiler OCI420 Setting flags for configuring the device alarm on LPB 0 ... 255 (Development) 140/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 141: Lockout Position Storage

    PH_THL2_2 PH_TN_1 PH_TN_2 PH_STOER For meaning of the phase numbers, refer to the → Sequence diagrams Note 141/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 142: Legend Of Parameter Bit Fields Lmu

    Assignment of second time switch to OT terminals (X10-01) XX0X XXXX time switch acts on HC XX1X XXXX time switch acts on DHW 142/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...
  • Page 143 (1 = HC; 0 = DHW) 100X XXXX stepper motor valve, unipolar 101X XXXX stepper motor valve, bipolar 143/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...
  • Page 144 XXXX XXX1 modulating DtBegr dt limitation XXXX XX0X XXXX XX1X DtRegelung dt control XXXX X0XX XXXX X1XX 144/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 145: Burner Control Program

    Feedback signal from ignition XXXX XXX0 static (internally) XXXX XXX1 dynamic (externally) VO_Aktiv XXXX XX0X internal Vcc_3V3 XXXX 0XXX internal 145/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...
  • Page 146 Checking excessive dT (> dTkTrSTB + 8K) ON / OFF XXXX 0XXX checking OFF XXXX 1XXX checking ON 146/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 147: Operating Modes

    LPBErrorGerAlarm Setting flags for configuring the device alarm on LPB LPBAlarm Acknowledge XXXX XXX0 alarm acknowlegdement OFF LPBAlarmEvent XXXX XX0X event capability OFF (as supplied) 147/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 12 Parameter list / legend of parameter bit fields LMU... 07.11.2002...

  • Page 148: Glossary Of Abbreviations

    Room temperature setpoint of the HMI TvIst Actual value of the flow temperature (second heating circuit) TvSollMmi Flow temperature setpoint of the HMI 148/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 13 Glossary of abbreviations 07.11.2002...

  • Page 149: Addendum: Hydraulic Diagrams Bmu

    Instantaneous DHW heater with primary heat exchanger and Instantaneous DHW heater with secondary heat exchanger and pump circuit DHW pump and pump circuit 149/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...
  • Page 150 Purging Purging valve valve Stratification storage tank with charging pump and pump circuit Stratification storage tank with diverting valve and pump circuit 150/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...

  • Page 151: Pump Circuit Extensions Via Agu2.500

    Instantaneous DHW heater with primary heat exchanger and Instantaneous DHW heater with secondary heat exchanger, 2 pump circuits DHW pump and 2 pump circuits 151/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...
  • Page 152 Purging valve Stratification storage tank with charging pump and Stratification storage tank with diverting valve and 2 pump circuits 2 pump circuits 152/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...

  • Page 153: Mixing Circuit Extensions Via Agu2.500

    Diagram 48 Diagram 50 20 °C 20 °C 7494h01_50 Mixing circuit Storage tank system with one pump circuit and one mixing circuit 153/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 154 Instantaneous DHW heater with secondary heat exchanger, DHW pump, pump circuit and mixing circuit diverting valve (electromotoric or electrohydraulic), pump circuit and mixing circuit 154/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...
  • Page 155 Stratification storage tank with diverting valve, pump circuit Stratification storage tank with diverting valve, pump circuit and one mixing circuit with system pump and one mixing circuit 155/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...

  • Page 156: Zone Extensions

    (RVA46) clip-in or RVA46) Alternatively, the mixing cicuits of the RVA46 can also be additional pump circuits (including combinations). Zone control with RVA46 156/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...
  • Page 157 (including combinations). Q8 only via clip-in. Burner and DHW circuit (BMU) Storage tank system with diverting valve and zone control with RVA46... 157/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 158 Burner with inst. DHW heater and pump circuit (BMU) Instantaneous DHW heater with secondary heat exchanger and zone control with the RVA46... 158/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 159 Boiler with inst. DHW Q8 only via clip-in. heater and pump circuit (BMU and controller clip-in) Aqua-booster with zone control with the RVA46... 159/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 160 (including combinations). Storage tank 150 l Purging valve Stratification storage tank system with diverting valve and zone control with the RVA46... 160/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 161 Alternatively, the mixing cicuits of the RVA46 can also be additional pump circuits controller clip-in) (including combinations). Stratification storage tank system with diverting valve and zone control with the RVA46... 161/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU...

  • Page 162: Heat Generation Manager

    Diagram 80 BMU1 BMU2 BMUn 7494h02_80 Without DHW heating Diagram 81 BMUn BMU2 7494h02_81 BMU1 With DHW heating by a storage tank system 162/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 163 B M U 1 BMU2 BMUn 7494h02E_83 Solar-R Storage tank 150 l Purging valve With DHW heating by a stratification storage tank system 163/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 164 With DHW heating by an instantaneous DHW heater (aqua-booster) Diagram 85 BMUn BMU2 7494h02_85 BMU1 With DHW heating by a storage system with DHW charging pump 164/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 165 Flue gas sensor Outdoor sensor Room unit (QAA70) PWM pump, mandatory PWM pump, optional Multispeed pump, single-speed Heating controller (RVA) (no PWM pump) 7494h01legE 165/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...

  • Page 166: Assignment Of Hydraulic Diagrams To The Outputs Of The Lmu

    Pump is only switched off via PWM control, AC 230 V connection externally If Q8Fkt = 0: Control of Q1 (AC 230 V) If Q8Fkt = 1: Control of Q8 Q1 cannot be modulated 166/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 14 Addendum: Hydraulic diagrams BMU 07.11.2002...
  • Page 167 76 Boiler temperature setpoint 50, 57, 58, 66, 73, 74, 95, Room thermostat ........... 75 96, 98, 106 RU............... 75 Brief description LMU.......... 10 Time switch..........73 167/171 Siemens Building Technologies Titel des Dokumentes CC1P7494de HVAC Products Index 07.11.2002...
  • Page 168 Controller functions ........142 DHW storage tank-........56 LPB............147 DHW stratification storage tank- ...... 56 Operating modes ......... 147 Instantaneous DHW-....... 56, 100 Legionella function..........104 Modem function-.......... 106 168/171 Siemens Building Technologies Basisdokumentation LMU54... / LMU64... CC1P7494de HVAC Products Index 07.11.2002...
  • Page 169 Setting the LPB device and segment address ... 88 Programmable input of the LMU......106 Uniform system time ........86 Programmable output of the LMU......107 Pump circuit extensions........151 Technical data..........121 Pump control 169/171 Siemens Building Technologies Titel des Dokumentes CC1P7494de HVAC Products Index 07.11.2002...
  • Page 170 Weather compensation30, 45, 47, 61, 69, 72, 73, 74, With weather compensation ......78 Temperature limiter ......... 39, 54, 80 Terminals and wiring......... 119 Zone extensions ..........156 Testing by the customer ........120 170/171 Siemens Building Technologies Basisdokumentation LMU54... / LMU64... CC1P7494de HVAC Products Index 07.11.2002...
  • Page 171 Siemens Building Technologies AG © 2002 Siemens Building Technologies AG Landis & Staefa Division Subject to change Berliner Ring 23 D-76437 Rastatt Tel. 0049-7222-598-0 Fax 0049-7222-53182 www.landisstaefa.com 171/171 Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en HVAC Products 07.11.2002...

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