Connecting The Power Supply Cable; Start-Up/Shutdown; Initial Start-Up / Subsequent Start-Up - Grundfos DDI 222 Series Installation And Operating Instructions Manual

6.2 Connecting the power supply cable

Warning
Disconnect the power supply before connecting
the power supply cable!
Before connecting the power supply cable, check
that the rated voltage stated on the pump
nameplate corresponds to the local conditions!
Do not make any changes to the power supply
cable or plug!
The pump can be automatically started by
Caution
connecting the power supply!
The assignment between the plug-and-socket
Caution connection and the pump must be labelled
clearly (e.g. by labelling the socket outlet).
• Do not switch on the power supply until you are ready to start
the pump.
6.2.1 Versions without mains plug
Warning
The pump must be connected to an external
clearly labelled mains switch with a minimum
contact gap of 3 mm in all poles.
• Connect the pump to the mains in accordance with local
electrical installation regulations.
Warning
IP65 can only be ensured if the power supply
cable is connected with IP65 protection.
6.2.2 Version with mains plug
• Insert the mains plug in the mains socket.
Warning
The electronic printed circuit board may be live
even if the mains voltage is not connected!
The printed circuit board may only be replaced
by service personnel authorised by Grundfos.

7. Start-up/shutdown

Warning
Risk of chemical burns!
Wear protective clothing (gloves and goggles)
when working on the dosing head, connections
or lines!
Before each start-up, check the dosing head
screws.
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.
Torque: 7 Nm (+ 1 Nm).

7.1 Initial start-up / subsequent start-up

7.1.1 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.
7.1.2 Assisting suction for systems without flooded suction
At the dry suction/discharge valves:
1. Remove the suction line.
2. Hold a small container of water directly next to the suction
valve and draw water until the dosing head is full.
3. Reinsert the suction line.
7.1.3 Starting the pump
1. Open the suction and discharge isolating valves, if installed.
2. Depressurise the system on the discharge side of the pump:
– Open the system deaeration and evacuation valve.
3. Let the pump run in continuous operation:
– Switch on the power supply.
– Press the "Start/Stop" button and keep it pressed.
– The pump switches to continuous operation at maximum
stroke frequency.
4. Leave the pump running until the dosing head and the valves
are filled with medium and dosing medium flows from the
deaeration line on the discharge side.
5. Close the system deaeration and evacuation valve.
The pump is now ready for operation.
7.1.4 Tightening dosing head screws
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.
Torque: 7 Nm (+ 1 Nm).
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