en
Operation
24
WILO SE 2020-06
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Ambient temperature: 3 ... 40 °C (37 ... 104 °F)
8.2
During operation
CAUTION
Material damage due to pressure surges
Pressure surges can occur when switching off the pump. These pressure surges can
damage the pressure pipe and the lifting unit. Increase the follow-up time to pre-
vent the pressure surges. An extended follow-up time results in slurping operation
and the swing check valve closes more smoothly.
NOTICE
System problems when delivery head is too low
If the geodesic delivery head is below 2 m (6.5 ft), a leakage can occur in the collec-
tion reservoir. The swing check valve does not close tightly due to a lack of required
counter pressure. This can result in repeated activation (cycling) of the lifting unit.
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Open gate valves in the inlet and pressure pipe!
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The maximum inflow must be lower than the maximum output of the system.
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Do not open inspection openings on the collection reservoir and swing check valve!
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Ensure aeration and venting of the collection reservoir!
8.3
Emergency operation
8.3.1
Failure of the level control
If the level control fails, drain the collection reservoir in manual mode. For all relevant
information on manual mode, refer to the installation and operating instructions for the
switchgear.
CAUTION! Continuous duty is not permitted! Observe the operating mode. The op-
erating mode indicates the activation period and the downtime!
8.3.2
Failure of the lifting unit
If the lifting unit completely fails, pump out the sewage using a diaphragm hand pump.
1. Close the gate valve in the inlet.
2. Close the gate valve in the pressure pipe.
3. Pump sewage into the pressure pipe using the diaphragm hand pump.
8.3.3
Overflow of the lifting unit (acci-
dent)
DANGER
Danger due to fluids hazardous to health!
In the event of an accident, there is contact with the collected sewage. Observe the
following points:
• Wear protective equipment:
⇒ single-use body suit
⇒ sealed safety goggles
⇒ mouth protection
• Accessories used (e.g. diaphragm hand pump, hoses) must be thoroughly
cleaned and disinfected after completing work.
• Disinfect the lifting unit and operating space.
• Flush rinsing water into the sewer system.
• Dispose of protective clothing and cleaning material in accordance with local
regulations.
• Observe the specifications in the work regulations! The operator must make
sure that personnel have received and read the work regulations!
