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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
3.2 Selection of the compensation variants
Different types of compensation are used for the heating and the DHW circuit, depending
on the types of plant components. On completion of a certain startup time, during which
the connected components are queried, the relevant compensation variant is selected.
If plant components are connected or removed during operation, the compensation variant
changes after the new plant state is identified.
The plant components decisive for the compensation variant of heating circuits 1 and 2
or the following:
• The RU
• The outside sensor
• The HMI (none / cannot be parameterized / can be parameterized)
External heat demand signals (via the RVA...) are received directly and are not included
in the following table.
RU
QAA53 /
QAA73
RU for Hk1
active
RU for Hk2
active
Outside
sensor
Setpoint Hk1
TkSoll
Setpoint Hk2
TvSoll
Compensation
variant heating
circuit 1
Compensation
variant heating
circuit 2
Not present – – Not present
TvSollWf1 at
TaGem = 0 °C
TvSollWf2 at
TaGem = 0 °C
Emergency
operation
Emergency
operation
Not present – – Present TvSollWf1 TvSollWf2
Weather compen-
sation LMU
Weather compen-
sation LMU
Present No No Not present
TvSollWf1 at
TaGem = 0 °C
TvSollWf2 at
TaGem = 0 °C
Emergency
operation
Emergency
operation
Present No No Present TvSollWf1 TvSollWf2
Weather compen-
sation LMU
Weather compen-
sation LMU
Present Yes No Not present Tset / Tset2
TvSollWf2 at
TaGem = 0 °C
Room compen-
sation RU
Emergency
operation
Present Yes No Present Tset / Tset2 TvSollWf2
Weather compen-
sation RU
Weather compen-
sation LMU
Present Yes Yes Not present Tset / Tset2 Tset / Tset2
Room compen-
sation RU
Room compen-
sation RU
Present Yes Yes Present Tset / Tset2 Tset / Tset2
Weather compen-
sation RU
Weather compen-
sation RU
Present No Yes Not present
TvSollWf1 at
TaGem = 0 °C
Tset / Tset2
Emergency
operation
Room compen-
sation RU
Present No Yes Present TvSollWf1 Tset / Tset2
Weather compen-
sation LMU
Weather compen-
sation RU
TvSollWf1 Flow temperature setpoint resulting from weather compensation for heating circuit 1
TvSollWf2 Flow temperature setpoint resulting from weather compensation for heating circuit 2
TsRaumMmi Room temperature setpoint of HMI
TSet Flow temperature setpoint of RU for heating circuit 1
Tset2 Flow temperature setpoint of RU for heating circuit 2
TrSet Room temperature setpoint of RU for heating circuit 1
RT / SU Room thermostat / time switch
SU program Hz1 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
Heating circuits
Without HMI
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