Specifications

15
4.2 Selectingthecontrolsystem
Thevariouscontrolsystems
– System1:Roomhumiditycontrol
System1issuitedforairconditioningsystemswithmainlyrecirculatedair.Thehumiditysensor
ispreferablylocatedintheroomitselforintheexhaustairduct.
A1/2 humidity sensor
B1 ventilationinterlock
B2 airowmonitor
B3 safetyhumidistat
PI
E
 externalcontinuouscontroller(e.g.PIcontroller)
PID
I
internal continuous controller (PID controller)
Y input signal from A1
Z input signal from A2
A1 humidity sensor
B1 ventilationinterlock
B2 airowmonitor
B3 safetyhumidistat
PI
E
 externalcontinuouscontroller(e.g.PIcontroller)
PID
I
internal continuous controller (PID controller)
Y input signal from A1
– System2:Roomhumiditycontrolwithcontinuouslimitationofthesupplyairhumidity
System2issuitedforairconditioningsystemswithalargeportionofsupplyair,lowsupplyair
temperature,post-humidication,orvariableairowvolume.Ifthesupplyairhumidityexceeds
the preset value, the continuous limitation is effected prior to the room hum idity control.
Thehumiditysensor(A1)ispreferablylocatedintheexhaustairductorintheroomitself.The
humidity sensor (A2) for the limitation of the supply air humidity is located in the supply air duct
after the steam distribution pipe. This control system requires the internal PID controller or an
externalcontinuouscontrollerwiththeoptiontoconnectasecondhumiditysensor.
Attention! The continuous limitation of the supply air humidity is no substitute for the safety -
humidistat.