Condair EL2 - Page 21

21
Condair EL2
– System 3: Supply air humidity control with continuous output limitation
Supply air humidity control (humidity sensor installed in supply air duct) should be used
only where room humidity control is impracticable for technical reasons. Such systems
always require a PI-controller.
Thehumiditysensor(A1)islocatedinthesupplyairductafterthesteamdistributionpipe.The
humiditysensor(A2)forthecontinuousoutputlimitationislocatedinthesupplyairductbefore
the steam distribution pipe. Such a system requires a PI-controller with the option to connect a
second humidity sensor.
A1/2 humidity sensor
B1 ventilation interlock
B2 airowmonitor
B3 safetyhumidistat
PI
E
External PI controller
Y inputsignalfromA1
Z inputsignalfromA2
Which humidity control system for which application?
Application Location of the humidity sensor
room or exhaust air duct supply air duct
Airconditioningsystemswith:
–supplyairportionupto33% System 1 System 1
–supplyairportionupto66% System 1 or 2 System 2 or 3
–supplyairportionupto100% System 2 System 3
– supply air humidity control — System 3
Directroomhumidication System 1 —
Please contact your Condair supplier, if your application meets the following conditions:
– Humidicationofsmallroomsupto200m
3
– Airconditioningsystemswithahighnumberofairexchanges
– Systemswithvariableairvolumeow
– Testfacilitieswithextremecontrolaccuracyrequirements
– Rooms with a high variation in max. steam capacity
– Systemswithtemperatureuctuations
– Coldroomsandsystemswithdehumidication
Admissible input signals
– 0...10VDC(externalcontinuouscontroller)
– 24VOn/Off(humidistat)