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Make sure that the sliding surfaces do not become
damaged!
•
Screw a new impeller fastener (cylinder screw with
socket hex and a new screw fixing) back into the
shaft. Fasten the impeller and tighten the fastening
screw.
•
Place the pump unit on the sealing housing and
fasten it with screws.
•
It must be possible to turn the impeller by hand.
Changing wear ring
The stationary and mobile wear ring determine the gap
between the impeller (mobile wear ring) and the intake
port (stationary wear ring). If this gap is too big, the per-
formance of the machine decreases, and/or it can lead to
entanglements.
Both rings are designed so that they can be replaced. This
minimizes wear on the intake port and and impeller, con-
sequently reducing expense for spare parts.
Changing sealing parts
Changing sealing parts on the liquid side such as the block
seal cartridge and the mechanical seal shaft requires a
certain amount of specialist knowledge about these sen-
sitive components. In addition to this, in order to carry out
the work, much of the machine must be dismantled.
Only original parts may be used for replacement!
Inspecting and replacing these parts is performed by the
manufacturer during the general overhaul or by specially
trained personnel.
For machines approved for work in areas subject to
explosion danger, please refer to the "EX-protection"
in the appendix.
8. Shutdown
8.1. Temporary shutdown
For this type of shutdown, the machine remains installed
and is not cut off from the electricity supply. For tempo-
rary shutdown, the machine must remain completely sub-
merged so that it is protected from frost and ice. Make
sure the operating room and the pumped fluid cannot be
covered by ice.
This ensures that the machine is always ready for opera-
tion. During longer shutdown periods, carry out a regular
(monthly to quarterly) function run for a period of 5 min-
utes.
Caution!
Only carry out a function run under the proper con-
ditions of operation and use. Never run the machine
dry. This can result in irreparable damage!
8.2. Final shutdown / storage
Switch off the system, disconnect the machine from the
electricity supply and dismantle and store it. Note the fol-
lowing information concerning storage:
Beware of hot parts!
When removing the machine, be careful of the tem-
perature of the housing components. These can heat
up to well above 40°C. Let the machine cool down to
ambient temperature before you touch it.
•
Clean the machine.
•
Store it in a clean, dry place, protect the machine
against frost.
•
Place it down vertically onto a firm foundation and se-
cure it against falling.
•
Seal the intake and discharge ports of pumps with
suitable material (such as foil).
•
Support the electric connecting lead on the cable
lead-in to help avoid a permanent deformation.
•
Protect the ends of the electric power cable from
moisture.
•
Protect the machine from direct sunshine as a pre-
ventive measure against brittleness in elastomer
parts and the propeller and casing coating.
•
When storing the machine in a garage please remem-
ber: Radiation and gases which occur during electric
welding destroy the elastomers of the seals.
•
During lengthy periods of storage, regularly (for ex-
ample every six months) turn the impeller or propeller
by hand. This prevents indentations in the bearings
and stops the rotor from rusting up.
8.3. Restarting after an extended period of storage
Before restarting the machine, clean it of dust and oil de-
posits. Then carry out the necessary maintenance actions
(see "Maintenance"). Check that the mechanical shaft
seal is in good order and working properly. Once this work
has been completed, the machine can be installed (see
"Installation") and connected to the electricity supply by
a specialist. See "Start-up" for instructions on restarting.
Only restart the machine if it is in perfect condition and
ready for operation.
9. Troubleshooting
In order to prevent damage or serious injury while rectify-
ing machine faults, the following points must be observed:
•
Only attempt to rectify a fault if you have qualified
personnel. This means each job must be carried out
by trained specialist personnel, for example electrical
work must be performed by a trained electrician.
•
Always secure the machine against an accidental
restart by disconnecting it from the electric system.
Take appropriate safety precautions.
•
Always have a second person make sure the machine
is switched off in an emergency.
•
Secure moving parts to prevent injury.
•
Independent work on the machine is at one's own
risk and releases the manufacturer from any warranty
obligation.
ENGLISH | 41
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