Siemens LMU54 Series Basic Documentation page 5

Siemens Building Technologies
HVAC Products
Task of ∆T control with PWM pump ...............................................61
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First stage Maximum limitation of the flow temperature..................62
Second stage ∆T limitation ........................................................62
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Third stage ∆T supervision ........................................................63
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PWM pump control......................................................................63
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H-Q chart (example).................................................................63
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Adaption of modulating pump to the heating plant .........................64
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Parametes of the PWM pump (OEM) .............................................64
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Preset parameters .......................................................................64
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Activation of PWM pump via a configuration byte.............................65
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Parameters of the PWM pump (installer) ........................................66
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Parameters for temperatures ........................................................66
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PID controller coefficients of delta-T supervision..............................67
Summary of all ∆T parameters ......................................................67
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Behavior in different operating modes ............................................68
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Pump overrun ..........................................................................68
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Normal operation (heating operation)..........................................68
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Reduced (setback) operation.....................................................68
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Shutdown mode.......................................................................68
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Heating up phase.....................................................................68
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DHW operation........................................................................69
3.9 Heating circuit control..........................................................................70
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Attenuated outside temperature .................................................70
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Composite outside temperature ...................................................71
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Type of building construction .....................................................71
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Heating curves.........................................................................72
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Generating the demands for heat ..................................................73
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Time switch.............................................................................74
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Room thermostat .....................................................................75
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RU .........................................................................................75
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Combinations of RU and room thermostat / time switch.................76
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ECO functions ............................................................................77
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S / W changeover.....................................................................77
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Automatic 24-hour heating limit..................................................77
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Quick setback constant (KON) ......................................................78
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Generating the temperature demands .............................................78
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With fixed value control or emergency operation...........................78
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With weather compensation.......................................................78
4 Clip-in AGU2.500... for additional heating circuit.................................79
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Functions ...................................................................................79
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General...................................................................................79
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Hydraulic diagrams ......................................................................79
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Sensor inputs (analog inputs)........................................................79
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Inputs / outputs ...........................................................................79
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Interfaces for the LMU..................................................................80
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Sensor.......................................................................................80
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Frost protection...........................................................................80
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Overtemperature protection ..........................................................80
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Mixing circuits..........................................................................80
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Determining the flow temperature setpoint ......................................80
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Handling the locking signal........................................................80
Basic Documentation LMU54... / LMU64...
Contents
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CC1P7494en
07.11.2002