Operating The Pump; Shutdown - Grundfos DMH 25X Installation And Operating Instructions Manual

Warning
When dosing dangerous media, observe the correspond-
ing safety precautions!
Wear protective clothing (gloves and goggles) when work-
ing on the dosing head, connections or lines!
Always adjust the value with the discharge line connected
and with operating counter-pressure.
1. Fit a measuring device on the suction side, for instance place
the suction line in a graduated measuring beaker.
2. Set the dosing flow to 15 %.
3. Remove the cover (1l) from the stroke-length adjustment knob
(L).
4. Use a screwdriver to loosen the locking screw (2l) by
approximately 2 turns.
5. Switch on the pump.
6. Slowly turn the stroke-length adjustment knob towards the zero
point until the dosing (the liquid level falls) stops in the
measuring device.
7. Switch off the pump.
8. Set the scale ring (4l) to zero.
• Loosen the screw (3l) in the scale ring (4l) slightly using an
hexagon key, M3.
• Turn the scale ring (4l) until both "0" are the same on the
scale and scale ring.
• Tighten the screw (3l).
9. Depending on the application, tighten the locking screw (2l) so
that the stroke-length adjustment knob can still be turned/cannot
be turned any more.
10. Replace the cover (1l).

8.6 Operating the pump

When operating the pump, see sections Operation and
Note
Maintenance, if necessary, section Fault finding chart.
Related information
9.1 Switching on/off
10.1 General notes
11. Fault finding chart

8.7 Shutdown

Warning
Wear protective clothing (gloves and goggles) when work-
ing on the dosing head, connections or lines!
Do not allow any chemicals to leak from the pump. Collect
and dispose of all chemicals correctly!
If possible, rinse the dosing head before shutting down the
Note
pump, e.g. by supplying it with water.
8.7.1 Switching off/uninstalling
1. Switch off the pump and disconnect it from the power supply.
2. Depressurise the system.
3. Take suitable steps to ensure that the returning dosing medium
is safely collected.
4. Carefully remove all lines.
5. Uninstall the pump.
8.7.2 Cleaning
1. Rinse all parts that have come into contact with the medium
very carefully:
• lines
• valves
• dosing head
• diaphragm.
2. Remove any trace of chemicals from the pump housing.
8.7.3 Storage
Storage of the pump:
1. After cleaning, carefully dry all parts and reinstall the dosing
head and valves, or
2. change the valves and diaphragm.
See section Maintenance.
Related information
8.7.2 Cleaning
10.1 General notes
8.7.4 Disposal
Disposal of the pump:
• After cleaning, dispose of the pump in accordance with the
relevant regulations.
Related information
8.7.2 Cleaning
13. Disposing of the product
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