Stopping And Starting Dosing; Deaerating The Pump During Operation - Grundfos DMX 221 Installations- Und Bedienungsanleitung

3.4 Stopping and starting dosing

Make sure the pump was installed and started up correctly.
1. To stop dosing:
• For pumps with AR control unit, press the start/stop button.
• Switch off the power supply.
2. To start dosing:
• Switch on the power supply.
• For pumps with AR control unit, press the start/stop button.
Related information
• 3.1 Preparing the pump for startup
• 3.3 Starting up the pump

3.5 Deaerating the pump during operation

Make sure the pump was installed and started up correctly.
1. Relieve the counterpressure so that air can escape and dosing medium can flow out.
• Open the deaeration valve (17), if installed.
• Open the relief valve, if installed.
2. Switch on the power supply.
3. For pumps with AR control unit: Press the start/stop button and keep pressing it for continu-
ous operation during the deaeration process.
4. Set the stroke-length adjusting knob to 100 %.
5. Let the pump run until the dosing medium is free of air bubbles.
The pump has been deaerated.
6. Reactivate the deaeration valve or relief valve.
• Close the deaeration valve (17), if installed.
• Reactivate the relief valve, if installed.
7. Change back to operating settings of the pump.
Related information
• 3.3 Starting up the pump
• 3.4 Stopping and starting dosing
• 9.3.1 Torque values
WARNING
Chemical hazard
Death or serious personal injury
● 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.
DMX 221 | | 15