North Star M157593E Owner's Manual

Maintenance & Repair45Filter bowl Water DrainMaintain burner'sfuel filter/waterseparatorDrain water from burner's filter bowl as needed, and replace filter afterevery 500 hours of use or as needed.1) After each use of the burner, visually check the filter bowl. If any waterhas accumulated, drain it via the water drain at the bottom of the bowl.2) After every 500 hours of operation, inspect the fuel filter/water separator.Replace filter as needed.Figure 17Descale heating coil Descale coil tubing annually or more frequently as needed.In hard water areas, scale can build up inside the heating coil tubing. Scaledeposits will decrease the output pressure and temperature of heated spray,and may eventually clog water flow through the heating coil.Descale the coil tubing at least annually, and more frequently if you detect adecrease in output pressure or temperature.To descale the coil:1) Mix a commercial coil cleaner in a 5-gallon bucket and elevate thebucket so it is higher than the unloader.2) Attach the high-pressure hose(s) to the high-pressure water outlet on themachine. Do not hook up the spray gun.3) Place the other end of the high-pressure hose(s) in the 5-gallon bucket.4) Attach a short length of garden hose to the garden hose inlet on the pump.5) Prime the pump by filling the hose with water, then placing the end of thehose in the bucket.