Safety Instructions For Maintaining The Dosing Diaphragm Or The Valves; Preparing For Maintenance Of The Dosing Diaphragm Or The Valves - Grundfos DMX 221 Installations- Und Bedienungsanleitung

7.2 Safety instructions for maintaining the dosing diaphragm or the valves

Related information
• 7.3 Preparing for maintenance of the dosing diaphragm or the valves

7.3 Preparing for maintenance of the dosing diaphragm or the valves

1. Flush the dosing head with water, if possible.
2. While the pump is running, set the stroke-length adjusting knob to 100 %.
3. Switch off the pump and disconnect it from the power supply.
4. Close the vent plug.
5. Depressurise the pressure side of the dosing system.
6. Make sure no dosing medium can flow back from the outlet side.
7. Make sure the returning dosing medium is safely collected.
The pump is now ready for maintenance.
Related information
• 7.2 Safety instructions for maintaining the dosing diaphragm or the valves
WARNING
Chemical hazard
Death or serious personal injury
● Observe the material safety data sheet of the dosing medium.
● Wear protective clothing when working on the dosing head, connections or
lines.
● Before relieving the pressure from the outlet side, make sure escaping dosing
medium cannot cause any harm to persons or equipment.
● Collect and dispose of all chemicals in a way that is not harmful to persons or
the environment.
DANGER
Electric shock
Death or serious personal injury
● Only qualified persons are allowed to service the pump.
● Do not open the pump housing.
Only adjust the stroke length while the pump is running.
Close the vent plug when taking the pump out of operation for transport, storage
or service.
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