May be subject to change Page 30 of 33MaintenanceAt least every 3 months:The filters should be cleaned and renewed when needed. Usually the filters need to be renewedonce a year. The filter guard in the CTS602 control can be used in order to make sure that thefilters are checked. The filters can be cleaned by vacuuming or shaking them.Figure 23: Air Filter changeChanging filters:1. Loosen screws2. Remove the filter hatch3. Pull out the two filter frames for change/vacuumingOnce a year:- The sacrificial anode should be inspected and renewed if it is much corroded. The hot-water tank can corrode if the anode is left unchanged.- The intake should be inspected and any uncleanness should be removed.- The evaporator should be inspected and cleaned.- It should be checked that the condensate has free passage through the water seal and thecondensation drain.- The safety switch for the hot water tank should be controlled.- It is recommended to take out a subscription for service.