Rational iCombi Pro, Original Installation Instructions

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9 | Wastewater connection
72 / 96 80.06.083_iCombiPro-iCombiClassic_IM_en-US
Device size 20 half size GN, 20 full size GN
The average height of the 90-degree pipe on the wastewater connection is
78 mm [3 inch].
9.3 Additional ventilation of the drain section (optional)
NOTE
Overflow of the device due to external siphon
The device is already equipped with an integrated siphon. A second,
external siphon (p trap) without ventilation of the drain section can cause
the device to overflow.
No external siphon may be connected to the wastewater connection
without upstream ventilation.
Make sure that there is a free outflow zone or vent at the wastewater
connection.
NOTE
Regular cleaning of the funnel
The funnel on the ventilation pipe must be cleaned at regular intervals. The
funnel must be removed from the ventilation pipe for cleaning.