Starting Up The Pump - Grundfos DMX 221 Installations- Und Bedienungsanleitung

3.3 Starting up the pump

• Observe section Preparing the pump for startup
• Observe section Safety instructions and requirements for startup
• Make sure the pump is switched off, unpressurised and empty.
17
18
Pos.
15
16
17
18
1. Open the vent plug (18) in the pump housing.
The vent plug must be open while the pump is running.
2. Open the isolating valves on the inlet side and outlet side (15, 16), if installed.
3. 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.
4. Switch on the power supply.
5. For pumps with AR control unit: Press the start/stop button and keep pressing it for continu-
ous operation during the deaeration process.
6. Set the stroke-length adjusting knob to 100 %.
7. Let the pump run until the dosing medium is free of air bubbles.
The pump has been deaerated.
8. Reactivate the deaeration valve or relief valve.
• Close the deaeration valve (17), if installed.
• Reactivate the relief valve, if installed.
9. Cross-tighten the dosing head screws with the correct torque.
The pump is now started up. Make the required operating settings.
Related information
• 3.1 Preparing the pump for startup
• 3.2 Safety instructions and requirements for startup
• 3.9 Opening and reactivating the integral relief valve
16
15
Description
Isolating valve
Isolating valve
Deaeration valve
Vent plug
DMX 221 | | 14