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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
The plant night start by temperature difference for cooling demand occurs when
the following conditions are met:
– Room tmp > Start stpt cooling und
– Timer Minimum off time = 0
The shutdown occurs for:
– Room tmp < Start stpt cooling - Hysteresis
The plant night start by temperature difference for heating demand occurs when
the following conditions are met:
– Room tmp > Start stpt heating und
– Timer Min off time = 0
The shutdown occurs for cooling demand occurs for:
Room tmp > Start stpt heating + Hysteresis
The function when the room temperature sensor (return air sensor) fails.
Main Index > Unit > Operating mode > Tmp start
Parameter Range Function
Start stpt cooling
-64.0….64.0 [°C] Start temperature for cooling.
Cooling setpoint -64.0….64.0 [°C] Cooling setpoint.
Start stpt heating -64.0…64.0 [°C] Start temperature for heating.
Heating setpoint -64.0….64.0 [°C] Heating setpoint.
Hysteresis 0.1…64.0 [°C] Shutdown hysteresis.
Minimum off time 0…999 [min] Minimum switch-off time after active heating or cooling.
Min run time 0.0…..999.0 [min] Minimum runtime after a start.
5.2.8 Boost function (boost plant start)
Boost is enabled:
Main Index > Configuration > Configuration 2 > Boost <> No
Boost ensures a comfortable room temperature when the plant is switched on nor-
mally.
The heating and or cooling start can be enabled separately:
Main Index > Configuration > Configuration 2 > Boost
The function can be implemented using a return air sensor if no room sensor is
available.
Boost for cooling demand occurs when the following conditions are met:
– Room tmp > Start stpt cooling + Hysteresis and
– Time to normal start via the time switch program < Compensation time
The shutdown occurs for:
– Room tmp < Start stpt cooling
Boost for heating demand occurs when the following conditions are met:
– Room tmp < Start stpt heating - Hysteresis and
– Time to normal start via the time switch program < Compensation time
The shutdown occurs for:
– Room tmp > Start stpt heating
The function when the room temperature sensor (return air sensor) fails.
Cooling demand
Heating demand
Note
Parameter
Prerequisite:
Function
Cooling demand
Heating demand
Note
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 45