Siemens Climatix Series - Air Quality Control

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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
Main Index > Unit > Humidity control > Fan compensation
Parameter Range Function
Controller 0…100 [%] Present value for the controller. Go to controller set-
tings page.
Setpoint 0…100 [%] Controller setpoint relating to the room humidity.
Function – Increase
– Decrease
– Increase the fan setpoint.
– Reduce the fan setpoint.
– Room humidity setpoint: 50 %rH.
– Present room humidity: 40 % rH.
---> Controller output > 0 % (e.g. 50 %).
Switch function: Increase
The controller output increases the fan setpoint relating to the maximum allowable
fan compensation (See as well Fan compensation).
– Setpoint supply air pressure: 80 Pa (maximum possible setpoint = Setpoint of
the maximum enabled stage + Max Force, e.g. = 120 Pa).
– Maximum allowable fan compensation (100 % compensation): 40 %.
– Controller output: 50 %.
---> New setpoint = 80 Pa + (40 Pa * 50 %) = 100 Pa.
Switch function: Decrease
The controller output reduces the fan setpoint relating to the maximum allowable
fan compensation (See as well Fan compensation).
– Setpoint supply air pressure: 80 Pa (maximum possible setpoint = Setpoint of
the maximum enabled stage + Max Force, e.g. = 120 Pa).
– Maximum allowable fan compensation (100 % compensation): 40 Pa.
– Controller output: 50 %.
---> New setpoint = 80 Pa – (40 Pa * 50 %) = 60 Pa.
5.12 Air quality control
Main Index > Configuration > Configuration 2 > Fan comp air qual = Yes
und/oder
Main Index > Configuration > Configuration 1 > Hrec comp air qual = Yes
Fans (see fan compensation) and/or mixed air dampers are influenced based on
air quality. The fresh air volume is increased when CO
2
content is too high (fan
speed increases; recirculation flow is reduced). The fresh air volume is increased
when CO
content is too high (fan speed decreases; recirculation flow is increased).
Main Index > Unit > Air quality control
Parameter Range Function
Controller 0…100 [%] Present value for the controller. Go to controller set-
tings page.
Function
– Normal
– Inverted
The control direction of the controller must be se-
lected depending on demand:
Normal for CO
2.
Inverted for CO.
Setpoint 0…3000 [ppm] Air quality control setpoint.
Parameterization
Example
Prerequisite
Function
Parameter
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 90