Siemens Climatix Series User Manual

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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

Siemens Climatix Series Specifications

General

Application	HVAC control
Communication Protocols	BACnet, Modbus, KNX
Inputs	Analog and digital inputs
Outputs	Analog and digital outputs
User Interface	web interface
Power Supply	24 V AC
Protection Class	IP20
Mounting	DIN rail mounting