156 / 244
Siemens
Standard application AHU
CE1P3977en_02
Building Technologies
Configuration
01.02.2010
Parameter
Range
Explanation
The setting only makes sense when the sensor is mounted in the
duct and night start operations (e.g. night cooling) is used or as
safety function for the pump start at a low outside air temperature.
Room hum Sensor
No
Yes
Input for room humidity sensor.
Supply hum sensor
No
Yes
Input for supply air humidity sensor.
Outs air hum sensor
No
Yes
Input for outside air humidity sensor.
Functions
Damper
Open/close damper.
No
No dampers.
Combined
Two dampers with only one common output.
Supply
Supply air damper with output.
Exh
Two dampers with separate outputs.
Exhaust fan
Exhaust air fan (supply air fan is always available; cannot be dis-
abled).
No
No exhaust air fan.
Yes
Exhaust air fan with separate output.
Combined
Exhaust and supply air fan with common output.
Fan control mode
Select fan and control type.
Positions SupplySlv and ExhaustSlv not possible without enabled
exhaust air fan.
Positions Direct and DirectVar possible if the exhaust air fan is pa-
rameterized as combined.
The exact number of outputs depends on the number of steps and
whether or not the exhaust air fan is enabled. The number of re-
quired inputs/outputs double if the fan is enabled with a separate
output.
The sensors required for control, e.g. pressure sensors, are en-
abled here as well.
Direct
Up to 3 digital outputs each for stepped fans.
DirectVar
Up to 3 digital outputs each for stepped controlled variable speed
fans.
FixedSpeed
One digital and analog output each for analog – modulating con-
trolled variable speed drives (e.g. St1 = 2V, St2 = 5V, St3 = 8V).
Pressure
One digital and analog output each and one analog input each for
variable speed drives in pressure-controlled plants.
Flow
One digital and analog output each and one analog input each for
variable speed drives in flow-controlled plants.
SupplySlv
One digital and analog output each and three analog inputs for the
variable speed drives in pressure-controlled plants where the sup-
ply air fan operates dependent on the exhaust fan.
ExhaustSlv
One digital and analog output each and three analog inputs for the
variable speed drives in pressure-controlled plants where the ex-
haust air fan operates dependent on the supply air fan.
Tmp control mode
Select control algorithm for temperature control.
Supply
Supply air temperature control only.
RmSplyC
Room / supply air temperature cascade control.
RtrnSplyC
Return / supply air temperature cascade control.
RmSplyC Su
Room / supply air cascade control during the summer; supply air
temperature control only during the winter.
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 156