Nordmann ES4 - Selecting the Control System

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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 condition-
ing systems with mainly recirculated air. The humidity sensor or
humidistat respectively is preferably located in the room itself or in the
exhaust air duct.
– 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 vari-
able 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 dis-
tribution 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 humidity sensor
B1 ventilation interlock
B2 airow monitor
B3 safety humidistat
B4 humidistat
PI
E
External continuous controller
(e.g. PI controller)
Y input signal from A1
A1/2 humidity sensor
B1 ventilation interlock
B2 airow monitor
B3 safety humidistat
PI
E
External continuous controller
(e.g. PI controller)
Y input signal from A1
Z input signal from A2
Nordmann
ES4
Nordmann
ES4