Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
3.5 Air humidification
The controller can manage air humidification using a built-in humidifier in the unit.
The controller is set up at the factory with all the parameters required to control the installed humidifier.
3.5.1 Ancillary built-in humidifier functions
Humidifier control includes some ancillary functions, a description of which is given below.
3.5.1.1 Manual water drain
The manual water drain function is designed to fully empty the cylinder in the humidifier. This function is enabled only
through the web page. Access to this page requires the operator to log in with a Service level password. If the humidifier is
producing steam, enabling of the function causes steam production to be stopped instantly.
3.5.1.2 Pre-washing
The pre-washing function is used to wash the water lines and the humidifier cylinder. The cylinder is filled and then emptied
3 times in order to wash away impurities from the pipes and cylinder, if any. We recommend enabling this function especially
after connecting the water lines or after cylinder replacement. This function is enabled only through the web page. Access
to this page requires the operator to log in with a Service level password. If the humidifier is producing steam, enabling of
the function causes steam production to be stopped instantly.
3.5.1.3 Water drainage before machine shutdown
The function for water drainage before a machine shutdown is enabled in order to avoid water stagnation in the humidifier
cylinder, which may lead to the formation of algae or bacteria (e.g. Legionella), if the cylinder is filled with water for over 72
consecutive hours without producing steam. The cylinder is drained and remains as such until it receives a signal requesting
the production of steam. The function is always active and the shutdown interval is fixed.
3 Software functions