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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
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
TkSoll
7494d13e/0102
TkSmin
TkMax
TkSmax
Tstb
TkSmin TkSmax
TkSmaxAktuell
Min. difference to
temperature limiter (3K)
Min. difference to STB (3K)
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.
Limitation HC1: TkSmin ≤ temperature demand HC1 ≤ TkSnorm
Exception: → Warm air curtain function
Temperature limitation
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