39INSTALLATION & SERVICE MANUAL FOR PROFESSIONALSMaintenance and care: Preventative maintenanceenOperationSee user manual section “Transport and unwrapping” on page 7.Maintenance and carePreventative maintenancePreventative maintenance is necessary at regular intervals if the unit is to function efficientlyand optimally, in order to avoid unintended operation stoppages and to ensure the expectedlifetime of minimum 10 years.It is important to notice, that intervals between filter maintenance can vary depending onthe specific environment, and that moving parts are wearing parts, that needs replacementswhen worn down dependent on the specific environment.The factory warranty only applies if it can be documented that regular preventative main-tenance has been carried out as prescribed. The documentation can consist of a written logincluding a company stamp or equivalent.At minimum, maintenance must be carried out as shown here:Interval Task To be carried out by6 month Check filters, Replace if required User1 year Replace filters User2 yearsInspect and clean fans Trained professsionalsInspect and clean electrical preheater Trained professsionalsClean internal air path Trained professsionalsInspect and clean heat exchanger Trained professsionalsInspect and clean drip tray, drain and drain hose Trained professsionalsInjury by electric shock and risk of damage to the device• A biannual inspection every other year is to be performed by trained professionals only.• Turn off the unit while carrying out inspections of the unit’s internal parts.• If the power supply cable is damaged, this must be replaced by the manufacturer, its ser-vice agent or similarly qualified persons in order to avoid a hazard.Remove front cover in order to carry out the inspection.Step Action Illustration1 Remove the upper part of the front cover.2 Release the two screws at the upper left andright corner (underneath the upper part ofthe front cover).3 Remove the remaining part of the frontcover.Operating the unitIntroductionInterval summaryWarningCautionCAUTIONPreparing theinspection