Air Supply; Maintenance Work; Replacing The Mechanical Seal - Wilo VeroLine-IP-E Série Notice De Montage Et De Mise En Service

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10.1

Air supply

10.2

Maintenance work

10.2.1 Replacing the mechanical seal

Dismantling
98
The air supply to the motor housing must be checked at regular inter-
vals. In case of contamination, ensure that an air supply is re-estab-
lished in order to allow the motor and electronic module to cool
sufficiently.
DANGER! Risk of fatal injury!
There is a risk of fatal injury from electric shock when working on
electrical equipment.
• Check for absence of voltage and cover or cordon off adjacent live
parts.
DANGER! Risk of fatal injury!
Falling pumps or pump parts may result in life-threatening injuries.
• When performing installation work, protect the pump components
against falling.
During the running-in period, a minor amount of dripping is to be
expected. Even during normal operation of the pump, slight leakage
involving occasional drops is common. Once in a while, however, a
visual inspection is required. If there is clearly detectable leakage, the
seal is to be changed.
Wilo offers a repair kit which contains the necessary parts for replace-
ment.
1. Disconnect the system from the power and secure it against being
switched on.
2. Close the shut-off device upstream and downstream of the
pump.
3. Ensure system is voltage-free
4. Earth the work area and short-circuit.
5. Disconnect the power cable. If present, remove the cable for the
differential pressure sensor.
6. Depressurise the pump by opening the air vent valve
(Fig. 38 Item 1).
DANGER! Risk of scalding!
Due to high fluid temperatures there is a danger of scalding.
• If the pump fluid is hot, allow it to cool down before performing any
work.
7. Remove the motor/drive with impeller and shaft seal from the
pump housing by undoing the flange screws, (Fig. 6, Item 1.4).
NOTE:
If a differential pressure sensor is installed on the pump, it will now be
held in place by the coils of the pressure measurement lines only. To
prevent damage to the differential pressure sensor, you can bend it
slightly to the side.
NOTE:
To make it easier to dismantle the motor and to protect the electronic
module, you should remove the electronic module by loosening the
screws (Fig. 6, Item 7.4) and the tooth lock washers (Fig. 6, Item 7.5).
8. Remove the O-ring (Fig. 6, Item 1.13).
9. Remove the front retaining ring (Fig. 6, Item 1.12) from the shaft.
10. Pull the impeller (Fig. 6, Item 1.11) off the shaft.
11. Remove the rear retaining ring (Fig. 6, Item 1.12) from the shaft.
12. Remove the spacer (Item 1.22, see "Tab. 11: Spare part compo-
nents" on page 109) from the shaft.
13. Pull the mechanical seal (Fig. 6, Item 1.21) off the shaft.
WILO SE 11/2017