8104975PORTABLE FORCED AIR HEATERR 15 E UK®SERVICEPROCEDURESContinuedFigure 8 - Pressure Gauge Plug RemovalFigure 9 - Adjusting Pump PressurePumpPressureModel (PSI/Bar)50,000 Btu/Hr 4.9/0.338PUMP PRESSUREADJUSTMENT1. Remove pressure gauge plug from filterend cover.2. Install accessory pressure gauge (partnumber HA1180).3. Start heater (see Operation, page 5).Allow motor to reach full speed.4. Adjust pressure. Turn relief valve toright to increase pressure. Turn reliefvalve to left to decrease pressure. Seespecifications below for correct pres-sure for each model.5. Remove pressure gauge. Replace pres-sure gauge plug in filter end cover.PressureGaugePressureGaugePlugReliefValveFigure 11 - Spark Plug RemovalBurnerHead Spark PlugWireSparkPlugFigure 10 - Fuel Filter RemovalFUEL FILTER1. Remove side cover screws using 5/16"nut-driver.2. Remove side cover.3. Pull rubber fuel line off fuel filter neck.4. Carefully pry bushing and fuel filter outof fuel tank.5. Wash fuel filter with clean fuel and re-place in tank.6. Attach rubber fuel line to fuel filter neck.7. Replace side cover.SPARK PLUG1. Remove upper shell, page 7.2. Remove fan (see page 7).3. Remove spark plug wire from spark plug.4. Remove spark plug from burner headusing 13/16" open-end wrench.5. Clean and regap spark plug electrodesas follows: 1.9 mm (.075") gap6. Install spark plug in burner head.7. Attach spark plug wire to spark plug.8. Replace fan (see page 7).9. Replace fan guard and upper shell.Figure 12 - Spark Plug GapBend Here to Adjust Gap1.9 mm(.075")GapFuel FilterSide CoverFuelLine