Maintenance - Grundfos DMX 226 Safety Instructions And Other Important Information

Integral relief valve
Warning
Dosing heads with integral relief valve
must not be used for abrasive or
crystallising media.
Warning
Never start the pump if the overflow line is
not correctly connected to the relief valve.
Warning
Settings on the relief valve must only be
carried out by authorised and qualified
personnel!
Warning
Never set the opening pressure to values
higher than the maximum permissible
operating pressure of the dosing system
and dosing pump.
Warning
When dosing dangerous media, observe
the corresponding safety precautions!
Wear protective clothing (gloves and
goggles) when working on the dosing
head, connections or lines!

Maintenance

Warning
When dosing dangerous media, observe
the corresponding safety precautions!
Risk of chemical burns!
Wear protective clothing (gloves and
goggles) when working on the dosing
head, connections or lines!
Do not allow any chemicals to leak from
the pump. Collect and dispose of all
chemicals correctly!
Warning
The pump housing must only be opened
by personnel authorised by Grundfos!
Repairs must only be carried out by
authorised and qualified personnel!
Switch off the pump and disconnect it from
the power supply before carrying out
maintenance work and repairs!
4
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.
Warning
The gear grease must only be changed by
authorised and qualified personnel.
For this purpose, send the pump to
Grundfos or an authorised service
workshop.
If possible, rinse the dosing head, e.g. by
Caution
supplying it with water.
The O-rings must be correctly placed in
the specified groove.
Caution
Observe the flow direction (indicated by an
arrow on the valve)!
Adjust the stroke length only while the
Caution
pump is running!
During transport, the deaeration opening
Caution
must be closed with the screw plug!
Before start-up, replace the screw plug by
Caution
the deaeration screw!
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.
Fault finding chart
For further error signals for the control
Caution unit, refer to the complete installation and
operating instructions on the CD.