Temperature Limitation - Siemens LMU54 Series Basic Documentation

Temperature limitation

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Siemens Building Technologies
HVAC Products
If the selected limiter cutout temperature is too high, internal limitation will be as follows:
TkMax = Tstb – 3K
If the maximum boiler temperature setpoint is selected too high and the switch-off
differential too wide (temperature limiter level reached), a minimum differential between
boiler setpoint and limiter cutout temperature must be observed:
TkSmax = TkMax – 3K
TkIst
Tstb
Min. difference to STB (3K)
TkMax
temperature limiter (3K)
TkSmin
TkSmin
Limitation of the maximum boiler temperature setpoint by the temperature limiter
In this case, the maximum boiler temperture setpoint is «TkSmaxAktuell». The greater
demand from the consumer circuits cannot be satisfied. If, after use of the CM, the
current switch-off differential «SdAus» is changed, the limitation is made one more time.
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
Basic Documentation LMU54... / LMU64...
3 Functions
Min. difference to
TkSmax
TkSmax
TkSmaxAktuell
7494d13e/0102
TkSoll
CC1P7494en
07.11.2002