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8
Shut-down/dismantling
8.1
Personnel qualifications
8.2
Operator responsibilities
8.3
Shut-down
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Shut-down/dismantling
Due to their design, centrifugal pumps have rotating parts that are easily accessible.
Depending on the operating condition, sharp edges can develop on these parts. WARN-
ING! This can lead to cuts and limbs may be amputated and severed! Check the fol-
lowing at regular intervals:
▪ Operating voltage (+/-10 % of the rated voltage)
▪ Frequency (+/-2 % of the rated frequency)
▪ Power consumption between individual phases (max. 5 %)
▪ Voltage difference between the individual phases (max. 1 %)
▪ Max. switching frequency
▪ Minimum water submersion depending on the operating mode
▪ Inlet: no air intake
▪ Level control device/dry-running protection: Switching points
▪ Quiet/low-vibration running
▪ All gate valves open
Operation in the limit range
The pump can briefly be operated in the limit range (max. 15 min/day). During operation
in the limit range, expect relatively large deviations from the operating data. NO-
TICE! Continuous duty in the limit range is prohibited! The pump is exposed to high
wear and there is a greater risk of failure!
The following parameters apply during operation in the limit range:
▪ Operating voltage (+/-10 % of the rated voltage)
▪ Frequency (+3/-5 % of the rated frequency)
▪ Power consumption between individual phases (max. 6 %)
▪ Voltage difference between the individual phases (max. 2 %)
▪ Operation/control: Operating personnel must be instructed in the functioning of the
complete system.
▪ Electrical work: A qualified electrician must carry out the electrical work.
▪ Installation/dismantling: The technician must be trained in the use of the necessary
tools and fixation materials for the relevant construction site.
▪ Locally applicable accident prevention and safety regulations of trade associations.
▪ Observe regulations for working with heavy loads and under suspended loads.
▪ Provide the necessary protective equipment and make sure that the personnel wears it.
▪ Provide adequate aeration in closed rooms.
▪ Take immediate countermeasures if there is a build-up of toxic or suffocating gases!
The pump is deactivated during decommissioning, but remains installed. This ensures
that the pump is always ready for operation.
‡
To protect the pump from frost and ice, always immerse the pump completely in
the fluid.
‡
The temperature of the fluid must always be above +3 °C (+37 °F).
1. Switch off the pump at the operating point.
2. Secure the operating point against being switched on again by unauthorised per-
sons (e.g. lock main switch).
▶ The pump is out of operation and can now be dismantled.
If the pump remains installed after decommissioning, observe the following:
▪ Ensure that the prerequisites for decommissioning are maintained for the complete
period of decommissioning. If these prerequisites cannot be guaranteed, dismantle the
pump after decommissioning!
▪ For an extended period of decommissioning, carry out a 5-minute function test at reg-
ular intervals (monthly to quarterly). CAUTION! A function test may only be carried
out under the applicable operating conditions. A dry run is not permitted! Non-com-
pliance can result in irreparable damage!
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