Fig.4.g
Key:
Steam_pr Steam production %rH Relative humidity measured
Pmax Max production hy Activation hysteresis
Pmin Min production
Tab.4.c
To verify that the relative humidity measured by the probe is within certain predefined values, two alarm
thresholds can be set in autonomous control:
l high relative humidity;
l low relative humidity.
When these thresholds are exceeded, an alarm is activated and the corresponding relay contact is closed.
4.6.5 Autonomous control with relative humidity probe and
outlet limit probe
In this case too, the controller modulates steam production based on the % rH measured by the main
relative humidity probe, while limiting production if the humidity measured by a second limit probe,
located in the air duct downstream of the steam distributor, approaches the maximum desired value.
Consequently, to prevent the relative humidity of the outlet air from exceeding a value that is considered
excessive, autonomous control with a limit probe can be set with a high relative humidity alarm
threshold. When this threshold is exceeded, an alarm is activated and the corresponding relay contact is
closed. The limit probe allows steam production to be modulated depending on the specific set limit
differential.
4.6.6 Application for steam baths
In applications for steam baths, in which the control probe measures temperature rather than humidity,
the same rules apply as for autonomous control with probe. By setting control based on temperature, the
humidifier will continue to produce steam until reaching the desired set point temperature inside the
steam bath, and consequently the desired saturation of the air (fog effect). Recommended CAREL
transducer: ASET030000 or ASET030001 or NTC probe UEKNTC0*.
4.7
Steam
production
control signals
Depending on the type of signal used, steam production can be enabled and/or managed in different
ways (ON/OFF or modulating).
Important: the probe inputs are protected against short-circuits, and the maximum current delivered
(3U) is 50 mA. Despite this, it is recommended to configure the “Control type” before connecting the
probes to the terminals.
To help users configure the unit, a screen index is shown at the top right of the display. The screen index
corresponds to the sequence in each menu in order to reach the specific page.
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