Rational LM1 Series, Original Installation Manual, Page: 69 / 92

9 | Wastewater connection
80.06.070_iCombi Pro-iCombi Classic_IM_V01_en-GB 69 / 92
Unit size 6-1/1 GN up to 10-2/1 GN
The average height of the waste water connection for tabletop units is around
50 mm [1.57 inches].
Unit size 20-1/1 GN, 20-2/1 GN
The average height of the waste water connection is 70 mm [2.76 inches].
9.3 Additional aeration of the drain (optional)
NOTICE
Unit overflowing through external siphon
The unit is already equipped with an integrated siphon. A second external
siphon without aeration of the drain will cause the unit to overflow.
No external siphon may be connected to the waste water connection without
upstream aeration.
You must ensure that there is a free outlet section and vent for the drain
connection.
If an external siphon is connection, the unit requires additional aeration of the
drain via a ventilation pipe, which is connected to the drain pipe and prevents
the unit from overflowing. The bottom part of the ventilation pipe has holes in it
to create a chimney effect.