English (GB)
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7.3.2 Dismantling the diaphragm and valves
1. Make system pressureless.
2. Empty the dosing head before maintenance and
flush it, if necessary.
3. Set adjustment knob to 0 %.
4. Switch off mains supply.
5. Take suitable steps to ensure that the returning
liquid is safely collected.
6. Dismantle suction, pressure and deaeration
hoses.
7. Dismantle valves on suction and discharge side
(5, 6).
8. Remove the cover (9).
9. Loosen screws (8) on the dosing head (7) and
remove the screws and discs.
10. Remove the dosing head (7).
11. Unscrew diaphragm (4) counter-clockwise and
remove with flange (2).
7.3.3 Reassembling the diaphragm and valves
1. Attach flange (2) correctly and screw on new
diaphragm (4) clockwise.
– Make sure that the O-ring (3) is seated
correctly!
2. Connect/switch on mains supply.
3. Turn the adjustment knob slowly to bring the
diaphragm into its service position "inside"
(end of suction phase, diaphragm retracted).
Set adjustment knob back to 0 %.
4. Switch off mains supply again.
5. Attach the dosing head (7).
6. Install screws with discs (8) and cross-tighten.
– Torque: 3 Nm.
7. Attach the cover (9).
8. Install new valves (5, 6).
– Do not interchange valves and pay attention to
direction of arrow.
9. Connect suction, pressure and deaeration hoses
(see section
4.2 Hydraulic connection
).
10. Deaerate dosing pump (see section
5.3 Start and
deaerate the pump
).
11. Please observe the notes on commissioning in
section
5. Start-up
!
7.4 Repairs
After consulting Grundfos, please send the pump,
together with the safety declaration completed by a
specialist, to Grundfos. The safety declaration can
be found at the end of these instructions. It must be
copied, completed and attached to the pump.
If the above requirements are not met, Grundfos may
refuse to accept delivery of the pump. The shipping
costs will be charged to the sender.
8. Faults
8.1 Indication of faults
Depending on the selected operation mode,
the pump indicates the following faults with its LEDs:
For further faults, please see
8.2 List of faults
.
Warning
The pump housing must only be
opened by personnel authorised by
Grundfos!
Repairs must only be carried out by
authorised and qualified personnel!
Switch off the pump and disconnect it
from the voltage supply before carrying
out maintenance work and repairs!
Caution
If the pump has been used to dose
toxic liquids or liquids hazardous to
health, the pump must be cleaned prior
to dispatch!
LED
colour
Fault
Remedy
Yellow
low-level
signal
• fill tank
• check contact type
(see section
6.3.4
).
Red
empty signal
• fill tank
• check contact type
(see section
6.3.4
).
Red
(flashing)
motor
blocked
• reduce
backpressure
• have gear repaired,
if necessary.
