Condair CP3 - 4.3 Selecting the control system; System 1: Room humidity control; System 2: Room humidity control with continuous limitation of the supply air humidity

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4.3 Selecting the control system
The various control systems
– System 1: Room humidity control
System1issuitedfordirectroomhumidication and air conditioning systems with mainly
recirculated air.Thehumiditysensororhumidistatrespectivelyispreferablylocatedintheroom
itselforintheexhaustairduct.
A1 humidity sensor
B1 ventilationinterlock
B2 airowmonitor
B3 safetyhumidistat
B4 humidistat
PI
I
 InternalP/PIcontroller
PI
E
External continuous controller
 (e.g.PI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a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humi-
distat.
A1/2 humiditysensor
B1 ventilationinterlock
B2 airowmonitor
B3 safetyhumidistat
PI
I
 InternalP/PIcontroller
PI
E
External continuous controller
 (e.g.PIcontroller)
Y inputsignalfromA1
Z inputsignalfromA2