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Binding pump rotor If fan is hard to turn, see Pump Rotor, page 14. 9 SERVICE PROCEDURES Upper Shell Removal 1. Remove screws along each side of heater using 5/16" nut-driver. These screws attach upper and lower shells together. 2. Lift upper shell off. 3. Remove fan guard. Fuel Filter (70,000 BTU/Hr Model) 1. 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 out of fuel tank. 5. Wash fuel filter with clean fuel and replace in tank. 6. Attach rubber fuel line to fuel filter neck. 7. Replace side cover. WARNING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Upper Shell Fan Guard Figure 8 - Upper Shell Removal, 70,000 BTU/Hr Model Upper Shell Fan Guard Figure 9 - Upper Shell Removal, 100/150,000 BTU/Hr Models Fuel Filter Side Cover Fuel Line Figure 10 - Fuel Filter Removal, 70,000 BTU/Hr Model 10 11 101585 150,000 BTU/Hr PFA/P 041.G Fuel Filter (100/150,000 BTU/Hr Models) 1. Remove side cover screws using 5/16" nut-driver. 2. Remove side cover. 3. Pull upper fuel line off fuel filter neck. 4. Carefully pry bushing, lower fuel line, and fuel filter out of fuel tank. 5. Wash fuel filter with clean fuel and replace in tank. 6. Attach upper fuel line to fuel filter neck. 7. Replace side cover. Figure 11 - Fuel Filter Removal, 100/150,000 BTU/Hr Models Fuel Filter, Bushing, and Lower Fuel Line Upper Fuel Line Side Cover Spark Plug 1. Remove upper shell (see page 10). 2. Remove fan (see page 15). 3. Remove spark plug wire from spark plug. 4. Remove spark plug from burner head using 13/16" open-end wrench. 5. Clean and regap spark plug electrodes as follows: 70,000 BTU/Hr model: .055" (1.4 mm) gap, 100/150,000 BTU/Hr models: .075" (1.9 mm) gap. 6. Install spark plug in burner head. 7. Attach spark plug wire to spark plug. 8. Replace fan (see page 15). 9. Replace fan guard and upper shell. SPARK PLUGF iRguErMe O1V2 A- LS p70a,r k1 0P0lu &g1 R50emoval PFA/P 031A Burner Head Spark Plug Wire Spark Plug Figure 13 - Spark Plug Gap Bend Here to Adjust Gap Gap 12 101585 Air Output, Air Intake, and Lint Filters 1. Remove upper shell (see page 10). 2. Remove filter end cover screws using 5/16" nutdriver. 3. Remove filter end cover. 4. Replace air output and lint filters. 5. Wash or replace air intake filter (see Preventative Maintenance Schedule, page 8). 6. Replace filter end cover. 7. Replace fan guard and upper shell. IMPORTANT: Do not oil filters. Air Intake Filter Lint Filter Filter End Cover Air Output Filter Fan Guard Figure 14 - Air Output, Air Intake, and Lint Filters, 70,000 BTU/Hr Model Air Intake Filter Filter End Cover Lint Filter Air Output Filter Figure 15 - Air Output, Air Intake, and Lint Filters, 100,000/150,000 BTU/Hr Models Figure 16P -R EPSrSeURsEs GuArUeG EG PaLUuGge PPFlAu/OgV 0R06eBmoval Pressure Gauge Plug Pressure Gauge Figure 17 - Adjusting Pump Pressure Pump Model Pressure 70,000 BTU/Hr 4.5 PSI 100,000 BTU/Hr 4.5 PSI 150,000 BTU/Hr 4.9 PSI Pump Pressure Adjustment 1. Remove pressure gauge plug from filter end cover. 2. Install accessory pressure gauge (part number HA1180). 3. Start heater (see Operation, page 7). Allow motor to reach full speed. 4. Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See specifications at right for correct pressure for each model. 5. Remove pressure gauge. Replace pressure gauge plug in filter end cover. (70,000 BTU/Hr Model Shown) Relief Valve Fan Guard Nozzle 1. Remove upper shell (see page 10). 2. Remove fan (see page 15). 3. Remove fuel and air line hoses from burner head. 4. Remove spark plug wire from spark plug. 5. Remove spark plug from burner head using 13/16" open-end wrench. 6. Remove three screws using 5/16" nut-driver and remove burner head from combustion chamber. 7. Place burner head into vise and lightly tighten. 8. Carefully remove nozzle from burner head using 5/8" socket wrench (see Figure 19). 9. Blow compressed air through face of nozzle. This will free any dirt in nozzle area. 10. Inspect nozzle seal for damage. 11. Replace nozzle into burner head and tighten firmly (80-110 inch-pounds/9.112.4 n-m). 12. Attach burner head to combustion chamber. 13. Install spark plug in burner head. 14. Attach spark plug wire to spark plug. 15. Attach fuel and airline hoses to burner head. 16. Replace fan (see page 15). 17. Replace fan guard and upper shell. Combustion Spark Plug Chamber Burner Head Air Line Hose Fuel Line Hose Screw Spark Plug Wire Figure 18 - Removing Burner Head Nozzle Face Fitting Nozzle Burner Head Air line Fuel line Fitting Nozzle Seal Figure 19 - Removing Nozzle 13 14 101585 Pump Rotor (Procedure if rotor is binding) 1. Remove upper shell (see page 10). 2. Remove filter end cover screws using 5/16" nutdriver. 3. Remove filter end cover and air filters. 4. Remove pump plate screws using 5/16" nutdriver. 5. Rem...

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