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7. Replace side cover. SERVICE PROCEDURES WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Upper Shell Fan Guard Figure 7 - Upper Shell Removal, 35/50/ 70,000 Btu/Hr Models Figure 8 - Upper Shell Removal, 100/ 150,000 Btu/Hr Models Fuel Filter Side Cover Fuel Line Fan Guard Upper Shell Fuel Filter, Bushing, and Lower Fuel Line Upper Fuel Line Side Cover Figure 10 - Fuel Filter Removal, 100/150,000 Btu/Hr Models OWNER’S MANUAL SERVICE PROCEDURES Continued Spark Plug (35,000 Btu/Hr Model) 1. Remove upper shell (see page 8). 2. Remove fan (see page 13). 3. Remove fuel and air line hoses from nozzle assembly. 4. Remove spark plug wire from spark plug. 5. Remove two screws using 5/16" nut- driver and remove burner strap. 6. Place hex-body of spark plug into vise and tighten. 7. Remove spark plug mounting nut using 11/16" open-end wrench. 8. Remove burner strap from spark plug. 9. Clean and regap spark plug electrodes to 1.4 mm (.055") gap. 10. Replace burner strap onto spark plug. Rotate burner strap to position spark plug electrodes (see Figure 13). 11. Tighten spark plug with spark plug mounting nut. 12. Release hex-body of spark plug from vise. 13. Replace burner strap onto combustion chamber. 14. Attach spark plug wire to spark plug. 15. Attach fuel and air line hoses to nozzle assembly. 16. Replace fan (see page 13). 17. Replace fan guard and upper shell. Spark Plug Combustion Mounting Nut Figure 11 - Spark Plug Removal, 35,000 Btu/Hr Model Chamber Burner Strap Nozzle Assembly Fuel Line Hose Air Line Hose Spark Plug Spark Plug Wire Bend Here to Adjust Gap 1.4 mm (.055") Gap Figure 12 - Spark Plug Gap, 35,000 Btu/Hr Model Burner Burner Strap Strap Figure 13 - Spark Plug Rotation, 35,000 Btu/Hr Model Only Spark Plug (50/70/100/150,000 Btu/Hr Models) 1. Remove upper shell (see page 8). 2. Remove fan (see page 13). 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: 50/70/100,000 Btu/Hr Models: 1.9 mm (.075") gap 150,000 Btu/Hr Model: 2.8 mm (0.110") gap 6. Install spark plug in burner head. 7. Attach spark plug wire to spark plug. 8. Replace fan (see page 13). 9. Replace fan guard and upper shell. Spark Burner Plug Head Wire Spark Plug Figure 14 - Spark Plug Removal, 50/70/ 100/150,000 Btu/Hr Models Bend Here to Adjust Gap Gap Figure 15 - Spark Plug Gap, 50/70/100/ 150,000 Btu/Hr Models Continued 104976 9 10 104976 PORTABLE FORCED AIR HEATERS Air Output, Air Intake, and Lint Filters 1. Remove upper shell (see page 8). 2. Remove filter end cover screws using 5/16" nut-driver. 3. Remove filter end cover. 4. Replace air output and lint filters. 5. Wash or replace air intake filter (see Preventative Maintenance Schedule, page 6). 6. Replace filter end cover. 7. Replace fan guard and upper shell. IMPORTANT: Do not oil filters 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 5). 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 below for correct pressure for each model. 5. Remove pressure gauge. Replace pressure gauge plug in filter end cover. Figure 16 - Air Output, Air Intake, and Lint Filters, 35/50/70,000 Btu/Hr Models Figure 18 - Pressure Gauge Plug Removal Pressure Gauge Plug Pressure Gauge Figure 19 - Adjusting Pump Pressure Pump Pressure Model (PSI/Bar) 35,000 Btu/Hr 2.9/0.200 50,000 Btu/Hr 4.9/0.338 70,000 Btu/Hr 5.2/0.359 100,000 Btu/Hr 3.9/0.269 150,000 Btu/Hr 4.8/0.331 (35/50/70,000 Btu/Hr Models Shown) Relief Valve SERVICE PROCEDURES Continued Air Intake Filter Lint Filter Filter End Cover Air Output Filter Fan Guard Air Intake Filter Filter End Cover Lint Filter Air Output Filter Figure 17 - Air Output, Air Intake, and Lint Filters, 100/150,000 Btu/Hr Models Fan Guard 104976 11 OWNER’S MANUAL Nozzle (35,000 Btu/Hr Model) 1. Remove upper shell (see page 8). 2. Remove fan (see page 13). 3. Remove fuel and air line hoses from nozzle assembly. 4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove. 5. Place plastic hex-body into vise and lightly tighten. 6. Carefully remove nozzle from the nozzle adapter using 5/8" socket wrench. 7. Blow compressed air thru face of nozzle. This will free any dirt in nozzle area. 8. Inspect nozzle seal for damage. 9. Replace nozzle into nozzle adapter until nozzle seats. Tighten 1/3 turn more using 5/8" socket wrench (4.5-5.1 n-m/ 40-45 inch-pounds). 10. Attach nozzle assembly to burner strap. 11. Attach fuel and airline hoses to nozzle assembly. 12. Replace fan (see page 13). 13. Replace fan guard and upper shell. Figure 20 - Removing Air and Fuel Line Hoses, 35,000 Btu/Hr Model Figure 21 - Removing Nozzle Assembly, 35,000 Btu/Hr Model Fig...

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