Installation; Safety Instructions; Installation Environment; Installation Of Pump - Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento

4. Installation

4.1 Safety instructions

• Liquid is under pressure and may be hazardous.
• When working with chemicals, local safety rules
and regulations must be observed (e.g. wear
protective clothes).
• Before starting work on the dosing pump and
system, 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
resistant to the new chemical. If there is any risk
of chemical reaction between the two types of
chemicals, clean the pump and system
thoroughly before 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.

4.2 Installation environment

• Exposure to direct sunlight should be avoided.
This applies especially to pumps with plastic
dosing 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.
12
100%
and are pressed
100%

4.3 Installation of pump

• See also the installation example in section
4.4 Installation example.
The dosing head may contain water from
the factory test. If a liquid which must not
come into contact with water is to be
Caution
dosed, it is recommended to let the pump
run with another liquid to remove the water
from the dosing head before installation.
Cross-tighten the dosing head screws with
a torque wrench once before
Caution
commissioning and again after 2-5
operating hours at 5.5 Nm (+ 0.5/- 0 Nm).
• Always install the pump on the supporting foot
with vertical suction and discharge ports.
• Always use suitable tools for the mounting of
plastic parts. Never apply unnecessary force.
• Make sure that the dosing pump and system are
designed in such a way that neither system
equipment nor buildings are damaged in case of
leakage 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.
Never attach a hose to the drain opening.
Caution
Fig. 1
Drain hole