Commissioning; Checks Before Start-Up; Start-Up - Grundfos DMX 226 Instrucciones De Instalación Y Funcionamiento

7. Commissioning

7.1 Checks before start-up

• Check that the rated voltage stated on the pump nameplate
corresponds to the local conditions!
• Check that all connections are secure and tighten,
if necessary.
• Check that the dosing head screws are tightened with the
specified torque and tighten, if necessary.
• Check that all electrical connections are correct.

7.2 Start-up

Before start-up, replace the screw plug by the
deaeration screw!
Caution
During transport, the deaeration opening must be
closed with the screw plug!
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.
1. Open the suction and discharge isolating valves (15, 16),
if installed.
2. Open the deaeration valve (17), if installed, in the discharge
line, or relieve the pressure on the discharge side so that the
medium can run out without a counterpressure.
3. Switch on the power supply.
4. Pumps with AR control unit only: Press the "Start/Stop" button
and keep it pressed.
– The pump switches to continuous operation.
5. Set the stroke-length adjustment knob to 100 %.
6. Leave the pump running until the dosed medium is free of air
bubbles.
7. Close the deaeration valve (17), if installed.
The pump is now ready for operation.
17
Fig. 17 Initial start-up
16
15
21