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Siemens
Standard application AHU
CE1P3977en_02
Building Technologies
Functions
01.02.2010
Parameter
Range
Function
air temperature < Min setpoint. The heating register is
started if this is not enough.
Max setpoint
Min setpoint...50 [°C]
Highest allowable supply air temperature for pure room
temperature or return air temperature control. A controlled
limiting of the heating controller occurs for supply air tem-
perature > Max setpoint.
5.5.6 Fan Heating / Cooling
Fan heating / cooling enabled in configuration 2. No settings required for I/Os in
configuration 1 and configuration.
Main Index > Configuration > Configuration 2
Parameter
Range
Function
Fan htg / clg
– No
– Htg
– Clg
– Htg+Clg
The fan is further used as a heating or cooling se-
quence.
– No sequential impact on the fan.
– Only impacts fan during the heating sequence.
– Only impacts fan during the cooling sequence.
– Impact on fan in both sequences.
Sequence fan clg
–
– Fan-Clg
– Clg-Fan
For fan cooling only!
– Fan sequence prior to cooling sequence.
– Cooling sequence prior to fan sequence.
Controller output reduced (increased during cooling) the fan setpoint as it relates to
the maximum allowable fan compensation (see Fan compensation as well) in the
event the supply air setpoint is not achieved.
The fan speed (stage) is reduced when all available heating registers are operating
at 100% during heating. This heats up the discharged air.
The fan speed (stage) is increased if all available cooling registers are operating at
100 % (Sequence fan clg = Clg-Fan) during cooling. This cools down the dis-
charged air. The fan speed (stage) is first increased during the sequence fan clg =
Fan-Clg and the first cooling register is switched on.
Main Index > Unit > Temperature control > Fan heating
Main Index > Unit > Temperature control > Fan cooling
Parameter
Range
Function
Controller
0…100 [%]
Present value for the controller. Go to controller set-
tings page.
Deadzone
0…20 [°C]
Controller dead zone heating: Setpoint = Supply air
setpoint – dead zone.
Controller dead zone clg: Setpoint = Supply air
heating se dead zone. Or if sequence is
placed last (Clg-Fan): Supply air cooling se
dead zone
– Calculated supply air setpoint for heating register: 22 °C.
– Dead zone for the fan heating controller (dead zone): 2 °C.
---> Effective setpoint for the controller = 22 °C – 2 °C = 20 °C.
Prerequisite
Enable
Function
Parameterization
Heating example
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 64
