Installation; Electrical Connections; Operation - Grundfos DMX 226 Safety Instructions And Other Important Information

Installation

Warning
Risk of hot surfaces!
Pumps with AC motors may become hot.
Allow a minimum space of 100 mm to the
fan cover!
Gently tighten the screws in order not to
Caution
damage the plastic enclosure!
Warning
All lines must be free from strain!
Only use the prescribed line types!

Electrical connections

Warning
Electrical connections must only be carried
out by qualified personnel!
Disconnect the power supply before
connecting the power supply cable and the
relay contacts!
Observe the local safety regulations!
Warning
The pump housing must only be opened
by personnel authorised by Grundfos!
Warning
Protect the cable connections and plugs
against corrosion and humidity.
Only remove the protective caps from the
sockets that are being used.
The power supply must be electrically
Caution
isolated from the signal inputs and outputs.
The pump is switched off by switching off
the power supply.
Note
Do not switch on the power supply until the
pump is going to be started.
Observe the direction of rotation!
A motor protector, adjusted to the rated
motor current, must be provided by the
customer.
This is also necessary for versions with AR
control unit!
Caution
When the pump is used with a frequency
converter, the jumpers in the terminal box
have to be set according to the converter
voltage.
The jumpers of three-phase motors are
factory-set for star connection.
Commissioning
Before start-up, replace the screw plug by
the deaeration screw!
Caution
During transport, the deaeration opening
must be closed with the screw plug!
After initial start-up and after each time the
diaphragm is changed, tighten the dosing
head screws.
Caution After approximately 6-10 operating hours
or two days, cross-tighten the dosing head
screws using a torque wrench.
Maximum torque: 6 Nm.

Operation

In the event of a diaphragm leakage, the
dosing liquid may leak out of the hole in
the intermediate flange between the pump
and the dosing head. The parts inside the
housing are protected from the dosing
liquid for a short time (depending on the
type of liquid) by the housing sealing. It is
Caution
necessary to check regularly (daily) if
liquid is leaking out of the intermediate
flange.
For maximum safety, we recommend the
pump version with diaphragm leakage
detection.
Before switching on the pump, check that
Caution it is installed correctly. Refer to sections
Installation and Commissioning.
Adjust the stroke length only while the
Caution
pump is running!
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