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53Mounting and installation work
5.6 Notes on humidity control systems/humidity control
5.6.1 System 1 – Room humidity control
System 1 is suited for direct room humidication and air conditioning systems with mainly recir-
culated air. The humidity sensor or humidistat respectively is preferably located in the room itself or in
the exhaust air duct.
Fig. 23: System 1 – Room humidity control
5.6.2 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.
Fig. 24: System 2 – Room humidity control with continuous limitation of the supply air humidity
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
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
53


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