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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
5 Functions
5.1 Global functions
5.1.1 General
This section describes special functions that related to the application as a whole.
None.
Main Index > Global functions
Parameter Range Function
Su-Wi calculation
– Summer
– Winter
Displays present status for summer and winter op-
eration.
Go to page to parameterize summer/winter
changeover.
Manual mode
– Auto
– Manual
Displays whether one of the outputs is not in auto
mode (intervention via HMI), a sensor is out of ser-
vice or the manual operation mode is not on auto.
Go to page with all digital inputs, e.g. to set the
alarm class for enabled manual alarm.
– Auto mode: No element in manual mode or out
of service.
– Manual mode: At least one element is in manual
operation or out of service.
Enable manual alarm
– No
– Yes
Enables an alarm if when Manual mode = Manual.
– No alarm trigger.
– Alarm trigger.
Enable comm test Function not yet available.
Communication test Function not yet available.
5.1.2 Summer Winter changeover
None.
It decides whether the plant is in summer or winter operation based on various op-
tions (hardware input, date, temperature). This information is required (as an op-
tion) to shut down humidification in summer, to changeover the Combi Coils and to
changeover temperature control (Tmp control mode = RmSplyC Su or RtSplyC Su).
A hardware input enabled for the changeover (Main Index > Configuration > Con-
figuration 1 > Su/Wi input = Yes) has the highest priority (Signal 1 = Summer).
The temperature or date can affect the changeover depending on parameteriza-
tion. Both criteria must be met when both are enabled. There is no changeover and
the plant in continuously in winter operation when no criterion is enabled.
Prerequisites
Parameters
Prerequisite
Function
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 33
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