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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. 11 099176 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. Relief Valve Pressure Gauge Plug (35/50/55/70,000 BTU/Hr Models Shown) Figure 13 - Pressure Gauge Plug Removal Pump Model Pressure 35,000 BTU/Hr 3.0 PSI 50,000 BTU/Hr 3.6 PSI 55,000 BTU/Hr 3.4 PSI 70,000 BTU/Hr 4.0 PSI 100,000 BTU/Hr 4.0 PSI 110,000 BTU/Hr 4.5 PSI 150,000 BTU/Hr 5.0 PSI Pressure Gauge Figure 14 - Adjusting Pump Pressure Upper Fuel Line 100 FUEL FILTER REMOVAL PFA/P 041 Fuel Filter, Bushing, and Lower Fuel Line Figure 16 - Fuel Filter Removal, 100/110/150,000 BTU/Hr Models Fuel Filter 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, fuel filter, and lower fuel line (100/110/ 150,000 BTU/Hr models only) 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. Fuel Filter Side Cover Figure 15 - Fuel Filter Removal, 35/50/55/70,000 BTU/Hr Models Upper Fuel Line Side Cover Air Line Hose Burner Strap Spark Plug Wire Nozzle Assembly Fuel Line Hose Spark Plug Spark Plug Combustion Mounting Nut Chamber Bend Here to Adjust Gap .055" Gap Continued Figure 17 - Spark Plug Removal, 35/50/55,000 BTU/Hr Models Figure 18 - Spark Plug Gap, 35/50/55,000 BTU/Hr Models Spark Plug (35/50/55,000 BTU/Hr Models) 1. Remove upper shell (see page 10). 2. Remove fan (see page 10). 3. Remove fuel and air line hoses from nozzle assembly. 4. Remove spark plug wire from spark plug. 5. Remove two (2) 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 .055" gap. 10.Replace burner strap onto spark plug. Rotate burner strap to position spark plug electrodes (see Figure 19, page 12). 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 10). 17.Replace fan guard and upper shell. Spark Plug (70/100/110/150,000 BTU/Hr Models) 1. Remove upper shell (see page 10). 2. Remove fan (see page 10). 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: 70/100,000 BTU/Hr Models = .055" gap 110/150,000 BTU/Hr Model = .075" gap 6. Install spark plug in burner head. 7. Attach spark plug wire to spark plug. 8. Replace fan (see page 10). 9. Replace fan guard and upper shell. Nozzle (35/50/55,000 BT...

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