Dimensions; Installation; Safety Instructions; Installation Environment - Grundfos DME 12 Montage- Und Betriebsanleitung

2.4 Dimensions

See dimensions at the end of these instructions.
All dimensions are in mm.

3. Installation

3.1 Safety instructions

• The liquid is under pressure and may be hazard-
ous.
• When working with chemicals, local safety rules
and regulations must be observed (e.g. wear pro-
tective clothes).
• Before starting work on the dosing pump and sys-
tem, disconnect the electricity supply to the pump,
ensuring that it cannot be accidentally switched
on. Before reconnecting the electricity supply,
make sure that the dosing hose is positioned in
such a way that any chemical left in the dosing
head is not ejected, thereby exposing persons to
danger.
• If the vent valve in the dosing head is used, it must
be connected to a hose which is led back to the
tank.
• When changing a chemical, make sure that the
materials of the dosing pump and system are re-
sistant to the new chemical. If there is any risk of
chemical reaction between the two types of chem-
icals, clean the pump and system thoroughly be-
fore adding the new chemical.
Proceed as follows:
Place the suction tube in water and press the
button until residual chemical has been removed.
Note: When the buttons
simultaneously, the pump can be set to run for a
specific number of seconds at maximum capacity.
The remaining number of seconds will appear in
the display. The maximum value is 300 seconds.

3.2 Installation environment

• Exposure to direct sunlight should be avoided.
This applies especially to pumps with plastic dos-
ing heads, as this material can be damaged by
sunlight.
• If the pump is installed outside, an enclosure or
similar protection is required to protect the pump
against rain and similar weathers.
100%
and are pressed
100%

3.3 Installation of pump

• See also the installation example in section 3.4.
• Note: The dosing head may contain water from
the factory test. If a liquid which must not come
into contact with water is to be dosed, it is recom-
mended to let the pump run with another liquid to
remove the water from the dosing head before in-
stallation.
• Note: Tighten the bolts in the dosing head after
2 to 5 operating hours (torque 5 Nm).
• Always install the pump on the supporting foot
with vertical suction and discharge ports.
• Always use suitable tools for the mounting of plas-
tic parts. Never apply unnecessary force.
• Make sure that the dosing pump and system are
designed in such a way that neither system equip-
ment nor buildings are damaged in case of leak-
age from the pump or rupture of hoses/pipes. The
installation of leakage hoses and collecting tanks
is recommended.
• Make sure that the drain hole in the dosing head
points downwards, see fig. 1.
Note: It is important that the drain pipe/hole is not
inserted direct into the tank contents, as gasses
may penetrate into the pump.
Fig. 1
Drain hole
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