Wilo -DrainLift M1/8 Einbau- Und Betriebsanleitung Seite 30

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Fig. 7: Permissible surfaces for the main inlet port (DNb100/DNb150)
Fig. 8: Setting up the inlet port (DNb100/DNb150)
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DN 100
DN 150
• Measure position. Pay attention to the minimum connection height for the inlet in the tank
and the perpendicular entry into the tank (90° ± 5°). The horizontal notch lines in the tank
provide orientation for the connection heights 180 mm and 250 mm (pipe centre). Other
infinitely variable connection heights are possible.
NOTE: Inlet ports below 180 mm are possible, but can cause a corresponding backflow in
the inlet pipe. In this case, when the pump run-time is set low, there is the danger that the
pipe no longer empties completely due to the low water level drop in the tank, which can
cause deposits to form inside it (see 8.2.2 Setting the pump run-time).
• Select the position and pipe installation so that surge-like water entry and strong air entry
are avoided as much as possible.
CAUTION! Risk of malfunctions!
Surge-like water entry can impair the function of the unit.
Connect the inlet pipe so that the entering water flow does not hit the float of the level
control directly!
• Drill a hole for the inlet with a keyhole saw (DNb100 included in delivery, DNb150 accessory)
in one of the tank surfaces intended for this purpose (Fig. 8).
Make sure the excess material in the drill bit is removed completely!
Max. speed 200 rpm; if necessary, put the saw down once in a while to remove drilled
material. If this material isn't completely removed, the tank material heats up and starts to
melt; Interrupt the cutting process, allow to cool and clean the saw; Lower the speed, vary
the feed pressure, and then maybe change the direction of rotation (counterclockwise
rotation max. 200 rpm), until there is no more material.
The hole sawed with the keyhole saw must lie within the
surfaces here (Fig. 7).
CAUTION! Risk of damage!
Connecting the inlet pipe outside of the
marked surfaces can lead to leakage, malfunc-
tions and damage to the product.
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20-30mm
WILO SE 02/2011