9. Schaltgerät - Kessel

7. Inspection and maintenanceThe system must be checked once every month by the operatorthrough observation of the switching routine for operationalability and leaks.CAUTION:Disconnect the unit from the mains during all maintenancework! Heed safety instructions!All the servicing and maintenance work describedbelow may only be carried out by authorised qualifiedpersonnel.Repairs may only be carried out by the manufactureror his authorised service partner.7.2 Notes on the aerating deviceThe aerating device can be used to completely empty thepressure pipe through manual lifting of the backwater flap onthe lifting system. To do this, an Allen key size 8 or openendedspanner size 15 must be used to hold the flap openerturned (see Fig. 2) as long as necessary until the pressurepipe is empty. Then the flap opener must always be returnedto its initial position or the marked operating position (seeFig. 3).DIN 1986, part 3, must be heeded during maintenance workon lifting stations. Maintenance work must be carried out regularlyby authorised qualified staff.IMPORTANT:All screws may only be tightened with a maximum torqueof 3 Nm.The following tasks have to be carried out:• Visual inspection of the complete system, pumps and fittingparts• Thorough cleaning of the complete system and the pump• Check on the complete system and pump housing for externaldamage and visible wear• Check on the pump for free movement, wear and deposits• Check the connection cables for mechanical damage andwear• Check the seal connections for air-tightness and replacethe seal (e.g. O-ring) if there any indications of wear• Insulation test on the pump motor• Check non-return valve for function if appropriate• The backwater flap must be replaced after 2 years of operation.Fig. 27.1 Notes on the pumpThe pump should be checked at regular intervals. If operationalnoises increase, pumping capacity decreases or thereare vibrations in the pipeline system, the pump housing andimpeller must be checked for any stubborn soiling or wear.To do this, the motor unit must be loosened at the four attachmentscrews (refer also to section 10.2.1 or 10.2.2) and removedfrom the pump housing.When checking the pump housing, care must be taken thatthe ventilation bore hole is kept open under all operating conditions.Fig. 3Note:The complete flap housing can be removed for cleaningand maintenance purposes (see Fig. 4+5) by looseningthe screw connections on the lower and upper flange ofthe flap housing. The pressure pipe must have beenblocked off and emptied first, of course.64