North Star M157592O Owner's Manual

Contents

Maintenance & Repair45the hose in the bucket.6) Run the pressure washer in cold mode for 1 to 3 hours, recirculating thecleaning solution. CAUTION: Do not run the burner.7) Dispose of the cleaning solution where it is not harmful to animals or theenvironment.8) Flush with fresh water and clean the inlet strainer when finished.Figure 18Inspect heating coiland desoot asneededInspect and desoot coil annually.Most coils never require desooting. However, poor grades of fuel oil orinadequate combustion air will cause heavy soot build-up on the outsidesurface of the heating coil tubing. These deposits will insulate the coil,which then restricts air flow through the heat exchanger and furtheraggravates the soot build-up.If soot has built up on the exterior of the coil tubing, clean as follows:1) Wear protective clothing, goggles, andgloves.2) Disconnect high-pressure hose on inletside of coil and thermostat on outletside of coil.3) Remove the lid and insulation lid fromthe heating chamber and hoist the coilout. Be careful, the coil weighs 125 lbs.4) Clean the coil.5) Reassemble the coil and lids to themachine. Make sure the whiteinsulation remains in place.6) Reattach high-pressure hose andthermostat and make sure all fittings aretight before using the machine.Figure 19