Daikin R-32 rooftop Series, Operation Manual

Page: 29 / 40

Translation from original instructions
Packaged Rooftop
29
We reserve the right to make changes without any prior notice.
UATYA
4P645203-1
5.5 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.
5.5.1 Ancillary built-in humidifier functions
Humidifier control includes some ancillary functions, a description of which is given below.
5.5.1.1 Manual water drain
The manual water drain function is designed to fully empty the cylinder in the humidifier. This function is enabled on
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.
5.5.1.2 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 on 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.
5.5.1.3 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.
5.6 Air dehumidification
Air dehumidification is required during the cooling cycle, where it occurs naturally.
If dehumidification is required simultaneously with cooling, the controller starts the compressors, based on which of
the two demands is greater.
The possibility exists that the temperature setpoint is reached before the humidity setpoint is achieved. If this is the
case, the controller pushes cooling even further so as to cause the temperature to drop below the setpoint.
However, to prevent an excessive drop of the air temperature in the room, the controller uses the heating devices
fitted in the unit to post-heat the air.