. INSPECTION AND MAINTENANCE
Graf UK Ltd
5
INSPECTION AND MAINTENANCE
5.1 Obligations of the Operator
The system must always be turned on. The operator is obliged to ensure the fault-free operation of the system. Almost all
operational faults lead to a deterioration of the system’s cleaning performance. These should therefore be detected at an
early stage and eliminated immediately by you or a qualified service technician.
5.1.1 Daily checks
The system should be checked daily for correct operation. The system is operating correctly when the
operating control is lit up green and no warning signal can be heard.
5.1.2 Monthly checks
• Visual inspection for any sludge output, turbidity or discoloration in the flow
• Check inflows and outflows for blockages (visual inspection)
• Read the operating hours counter on the air compressor (total operating hours), the ventilation (Y3 valve) and the clear
water run-o (Y4 valve) and record in the operating log
5.2 Maintenance by a Specialist Company
Maintenance is carried out by a specialist company (experts) at least twice a year (approximately every 6 months). The
time intervals and tasks specified by the local water authority in the consent permit under water laws also apply. For this
purpose, the system owner must complete a maintenance contract with a qualified specialist.
• The following tasks should be carried out in relation to maintenance:
• Inspection of the log book with determination of the regular operation (target-actual comparison),
• Check the air filter of the air compressor,
• Maintenance of the air compressor according to the manufacturer’s instructions,
• Functional check of the air compressor and stepper motors,
• Carry out general cleaning work, e.g. removal of deposits,
• Check for adequate ventilation,
• Examination of activation tank:
– Oxygen concentration (O2/l > 2 mg), adjust the operating time of the compressor if necessary,
– Sludge volume ( < 900 ml/l),
If the sludge volume is greater than 900 ml/l, the sludge must be removed.
Maintenance tasks carried out, any damage detected or repairs made as well as other instances should be summarised
by the maintenance company in a maintenance report.
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