Installation; Safety Instructions; Precautions; Installation Of Pump - Grundfos DMM 4 Instrucciones De Instalación Y Funcionamiento

4. Installation

4.1 Safety instructions

• 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 line is positioned in
such a way that any chemical left in the dosing
head is not ejected, thereby exposing persons to
danger.
• The dosing head, connections, and dosing lines of
the system may be under pressure. Work on dos-
ing systems requires special safety precautions
and should only be carried out by instructed per-
sons.
• If dosing head connections are unscrewed during
operation for venting or other purposes, make
sure that any leaking chemical is removed imme-
diately. This is important in order to avoid the risk
of personal injury and corrosion of the pump and
system.
• 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 chemicals, clean the pump and
system thoroughly before adding the new chemi-
cal.
• After changing the cable entries to the pump, en-
sure that the screwed cable entries are thoroughly
tightened.

4.2 Precautions

Note:
• When selecting a dosing pump in connection with
the construction of a system as well as the instal-
lation and operation of the pump, make sure that
local rules are observed. This applies to the selec-
tion of suitable pump materials, the handling of
the chemical as well as the electrical connection.
• Consider the technical data of the dosing pump in
connection with the selection, installation, and op-
eration of the pump. The system should be de-
signed according to the technical data (e.g. pres-
sure loss in lines depending on diameter and
length).
• Always use suitable tools for the mounting of plas-
tic parts. Never apply unnecessary force. Plastic
parts are fitted and removed more easily if the
thread is lubricated with vaseline or silicone
grease prior to the fitting/removal.
• 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 lines and collecting tanks is
recommended.
• The dosing pump is manufactured according to
the highest quality standards ensuring long life.
Nevertheless, the pump contains wearing parts,
such as diaphragm, valve seats, and valve balls.
To ensure long life and to minimize the risk of in-
terruption of operation, visual checks should be
carried out at regular intervals. Operating and
maintenance personnel should therefore have free
access to the dosing pump.

4.3 Installation of pump

• See also the installation example in section 4.4.
• Always install the pump on the supporting foot
with vertical suction and discharge ports.
• Ensure that the pipes connected are not twisted in
the pump connections.
• Make sure that the drain hole in the dosing head
points downwards.
• Note: It is important that the drain pipe is not in-
serted direct into the tank contents, as gasses
may penetrate into the pump.
Lead the drain pipe to a vented collecting tank.
Alternatively, lead the drain pipe to a collecting
funnel above the tank (see the installation exam-
ple in section 4.4). In the latter case, sufficient dis-
tance must be kept between pipe and funnel,
which also makes it possible to actually see a pos-
sible leakage.
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