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54 Mounting and installation work
A1/2 humidity sensor
B1 ventilation interlock
B2 airow monitor
B3 safety humidistat
PI
I
Internal PI controller
PI
E
External PI controller
Y input signal from A1
Z input signal from A2
5.6.3 System 3 – Supply air humidity control with continuous output limit ation
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 distri-
bution pipe. Such a system requires a PI-controller with the option to connect a second humidity sensor.
Fig. 25:
System 3 – Supply air humidity control with continuous output limit ation
5.6.4 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 Nortec 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
54


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