Siemens LMU54 Series Basic Documentation page 4

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Siemens Building Technologies
HVAC Products
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Heating circuits........................................................................... 30
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Room setpoint ............................................................................ 32
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Configuration of the heating circuits............................................... 34
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DHW circuit................................................................................ 35
3.3 Acquisition of actual values .................................................................. 37
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Assignment of analog sensors ...................................................... 37
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Temperatures ............................................................................. 37
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Display of ionization current.......................................................... 38
3.4 Supervisory functions .......................................................................... 39
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Temperature limiter function ......................................................... 39
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Flue gas temperature supervision.................................................. 39
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Plausibility check of sensor ....................................................... 39
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Function ................................................................................. 39
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Electronic (S)LT.......................................................................... 40
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Handling faults ........................................................................ 40
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Flow switch / water pressure supervision........................................ 42
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Function of flow switch.............................................................. 42
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Function of pressure switch....................................................... 42
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Pressure sensor.......................................................................... 42
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Static supervision..................................................................... 43
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Dynamic supervision ................................................................ 44
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Load limitation ............................................................................ 45
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Speed limitation .......................................................................... 48
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Limitation of ionization current....................................................... 48
3.5 Boiler control...................................................................................... 49
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Frost protection for the boiler ........................................................ 49
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Controller delay .......................................................................... 49
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Controller delay due to parameterization ..................................... 49
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Controller delay due to SLT criterion........................................... 50
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Controller configuration................................................................ 50
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Transfer of setpoint / actual value............................................... 50
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Determining the controller coefficients ........................................ 50
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Heat output limits ..................................................................... 51
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Boiler temperature control ............................................................ 52
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2-position control ..................................................................... 52
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Minimum boiler pause time........................................................ 52
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Boiler cycling protection ............................................................... 52
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Dynamic switch-off differential.................................................... 53
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Modulating control, conventional ................................................ 54
3.6 Hydraulic system management (HSM)................................................... 55
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Frost protection for the plant ......................................................... 55
3.7 Consumer management (CM) .............................................................. 56
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Determining the demands for heat................................................. 56
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Priorization of demands for heat ................................................ 56
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Determining the temperature demand ............................................ 57
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Temperature limitation.............................................................. 58
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Summer / winter (S / W) changeover.............................................. 59
3.8 Electronically controlled PWM heating circuit pump................................. 61
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General...................................................................................... 61
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Introduction ................................................................................ 61
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Notes ..................................................................................... 61
Basic Documentation LMU54... / LMU64...
Contents
CC1P7494en
07.11.2002