4.5.1 Air duct connection layout (multiport plenum PLM)
• PLM plenum is provided with n°10 possible air connections of which n° 6 closed by insulated plates (A) fixed by
selfdrilling screws, as shown on fig. 10a.
• in order to get the desired air inlet/air outlet layout, move opportunely and block again the plates on the
connections really not used; do this before positioning the plenum.
4.6 Air duct connections
• The air ducts must be correctly sized, in order to match unit external static pressure at duty airflow rate; take also
into account the air pressure drop of possible options.
• In order to prevent water condensation and to reduce noise to the rooms, it is strongly suggested to install
insulated air ducts or provide a duct insulation.
• Consider the need to install sound attenuators depending on unit sound level and the required acoustic comfort
of the room to be treated.
• Between unit and air ducts always install suitable flexible joints; anyway, the electrical continuity must be ensured
between air ducts (if metal type) and unit by a ground cable.
• Air duct weight shall not load the unit or its possible external sections.
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